update TODO

4 years ago · aaedf1d585
parent 0d45fa7b94
commit aaedf1d585
15 changed files with 3108 additions and 1 deletions
--- a/.gitignore
+++ b/.gitignore
@ -3,4 +3,3 @@ obj
 build/
 test/
 shuffle3-*
 profiling/
--- a/TODO.org
+++ b/TODO.org
@ -26,6 +26,33 @@
  - Can properly handle large files without core dumping
  - Doesn't dump huge amounts of trash onto each stack frame
 ** Performance
 ~[[https://github.com/sharkdp/hyperfine][hyperfine]]~ reports a *700-800%* speedup over =v1=.
   It's easy to see why.
 *** V1 flamegraph
    V1 uses a pesudo-array adaptor to perform filesystem reads, seeks, and writes. This causes a massive syscall overhead.
    [[./profiling/release-flame-old.svg]]
 *** V2 flamegraph
    Whereas V2 uses a single ~mmap()~.
    [[./profiling/release-flame.svg]]
 ** Memory usage
   The ~[[https://www.systutorials.com/docs/linux/man/1-memusage/][memusage]]~ graph for =v1= shows extremely inefficient stack usage.
   [[./profiling/old-mem.png]]
   ( the green is supposed to be a line, not a bar)
   This is due to how the unshuffler buffers RNG results.
 =v1= naively used VLAs to store this buffer, which can baloon to 8 times the size of the file being unshuffled.
   It dumps this massive buffer onto the stack frame of a function that is called multiple times, causing massive and inefficient stack usage.
   This can cause a segfault when attempting to unshuffle a large file, while shuffling a file of the same size might succeed.
 *** V2 improvement
    The ~memusage~ graph for =v2= is a lot more sane.
    [[./profiling/mem.png]]
 ~v2~ instead allocates this buffer on the heap. Note the stable stack and heap usage.
 * Todo
  - [X] impl rng
  - [X] impl shuffling
--- a/profiling/debug-flame-old.svg
+++ b/profiling/debug-flame-old.svg
--- a/profiling/debug-flame.svg
+++ b/profiling/debug-flame.svg
--- a/profiling/debug-flameu.svg
+++ b/profiling/debug-flameu.svg
--- a/profiling/massif.out.520307
+++ b/profiling/massif.out.520307
@ -0,0 +1,567 @@
 desc: (none)
 cmd: ./shuffle3-release small-u
 time_unit: i
 #-----------
 snapshot=0
 #-----------
 time=0
 mem_heap_B=0
 mem_heap_extra_B=0
 mem_stacks_B=0
 heap_tree=empty
 #-----------
 snapshot=1
 #-----------
 time=4048133
 mem_heap_B=32816
 mem_heap_extra_B=8
 mem_stacks_B=0
 heap_tree=empty
 #-----------
 snapshot=2
 #-----------
 time=4050820
 mem_heap_B=8
 mem_heap_extra_B=16
 mem_stacks_B=0
 heap_tree=empty
 #-----------
 snapshot=3
 #-----------
 time=4057134
 mem_heap_B=72712
 mem_heap_extra_B=24
 mem_stacks_B=0
 heap_tree=empty
 #-----------
 snapshot=4
 #-----------
 time=4282565
 mem_heap_B=73736
 mem_heap_extra_B=32
 mem_stacks_B=0
 heap_tree=empty
 #-----------
 snapshot=5
 #-----------
 time=4289663
 mem_heap_B=74248
 mem_heap_extra_B=40
 mem_stacks_B=0
 heap_tree=empty
 #-----------
 snapshot=6
 #-----------
 time=4295729
 mem_heap_B=75784
 mem_heap_extra_B=40
 mem_stacks_B=0
 heap_tree=empty
 #-----------
 snapshot=7
 #-----------
 time=4303612
 mem_heap_B=77832
 mem_heap_extra_B=40
 mem_stacks_B=0
 heap_tree=empty
 #-----------
 snapshot=8
 #-----------
 time=4318766
 mem_heap_B=86024
 mem_heap_extra_B=48
 mem_stacks_B=0
 heap_tree=empty
 #-----------
 snapshot=9
 #-----------
 time=4322930
 mem_heap_B=81928
 mem_heap_extra_B=40
 mem_stacks_B=0
 heap_tree=empty
 #-----------
 snapshot=10
 #-----------
 time=4353188
 mem_heap_B=98312
 mem_heap_extra_B=48
 mem_stacks_B=0
 heap_tree=empty
 #-----------
 snapshot=11
 #-----------
 time=4361448
 mem_heap_B=90120
 mem_heap_extra_B=40
 mem_stacks_B=0
 heap_tree=empty
 #-----------
 snapshot=12
 #-----------
 time=4421914
 mem_heap_B=122888
 mem_heap_extra_B=48
 mem_stacks_B=0
 heap_tree=empty
 #-----------
 snapshot=13
 #-----------
 time=4438366
 mem_heap_B=122888
 mem_heap_extra_B=48
 mem_stacks_B=0
 heap_tree=detailed
 n3: 122888 (heap allocation functions) malloc/new/new[], --alloc-fns, etc.
 n1: 72704 0x493F45A: pool (eh_alloc.cc:123)
  n1: 72704 0x493F45A: __static_initialization_and_destruction_0 (eh_alloc.cc:262)
   n1: 72704 0x493F45A: _GLOBAL__sub_I_eh_alloc.cc (eh_alloc.cc:338)
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     n1: 72704 0x40113C7: _dl_init (in /usr/lib/ld-2.32.so)
      n1: 72704 0x40020C9: ??? (in /usr/lib/ld-2.32.so)
       n1: 72704 0x1: ???
        n1: 72704 0x1FFF000AC6: ???
         n0: 72704 0x1FFF000AD9: ???
 n1: 49152 0x10A384: ??? (in /home/avril/work/shuffle3/lean/shuffle3-release)
  n1: 49152 0x109385: ??? (in /home/avril/work/shuffle3/lean/shuffle3-release)
   n0: 49152 0x4C6A151: (below main) (in /usr/lib/libc-2.32.so)
 n0: 1032 in 3 places, all below massif's threshold (1.00%)
 #-----------
 snapshot=14
 #-----------
 time=4438366
 mem_heap_B=106504
 mem_heap_extra_B=40
 mem_stacks_B=0
 heap_tree=empty
 #-----------
 snapshot=15
 #-----------
 time=4559248
 mem_heap_B=172040
 mem_heap_extra_B=48
 mem_stacks_B=0
 heap_tree=empty
 #-----------
 snapshot=16
 #-----------
 time=4592084
 mem_heap_B=172040
 mem_heap_extra_B=48
 mem_stacks_B=0
 heap_tree=detailed
 n3: 172040 (heap allocation functions) malloc/new/new[], --alloc-fns, etc.
 n1: 98304 0x10A384: ??? (in /home/avril/work/shuffle3/lean/shuffle3-release)
  n1: 98304 0x109385: ??? (in /home/avril/work/shuffle3/lean/shuffle3-release)
   n0: 98304 0x4C6A151: (below main) (in /usr/lib/libc-2.32.so)
 n1: 72704 0x493F45A: pool (eh_alloc.cc:123)
  n1: 72704 0x493F45A: __static_initialization_and_destruction_0 (eh_alloc.cc:262)
   n1: 72704 0x493F45A: _GLOBAL__sub_I_eh_alloc.cc (eh_alloc.cc:338)
    n1: 72704 0x40112DD: call_init.part.0 (in /usr/lib/ld-2.32.so)
     n1: 72704 0x40113C7: _dl_init (in /usr/lib/ld-2.32.so)
      n1: 72704 0x40020C9: ??? (in /usr/lib/ld-2.32.so)
       n1: 72704 0x1: ???
        n1: 72704 0x1FFF000AC6: ???
         n0: 72704 0x1FFF000AD9: ???
 n0: 1032 in 3 places, all below massif's threshold (1.00%)
 #-----------
 snapshot=17
 #-----------
 time=4592084
 mem_heap_B=139272
 mem_heap_extra_B=40
 mem_stacks_B=0
 heap_tree=empty
 #-----------
 snapshot=18
 #-----------
 time=4833798
 mem_heap_B=270344
 mem_heap_extra_B=48
 mem_stacks_B=0
 heap_tree=empty
 #-----------
 snapshot=19
 #-----------
 time=4899402
 mem_heap_B=270344
 mem_heap_extra_B=48
 mem_stacks_B=0
 heap_tree=detailed
 n3: 270344 (heap allocation functions) malloc/new/new[], --alloc-fns, etc.
 n1: 196608 0x10A384: ??? (in /home/avril/work/shuffle3/lean/shuffle3-release)
  n1: 196608 0x109385: ??? (in /home/avril/work/shuffle3/lean/shuffle3-release)
   n0: 196608 0x4C6A151: (below main) (in /usr/lib/libc-2.32.so)
 n1: 72704 0x493F45A: pool (eh_alloc.cc:123)
  n1: 72704 0x493F45A: __static_initialization_and_destruction_0 (eh_alloc.cc:262)
   n1: 72704 0x493F45A: _GLOBAL__sub_I_eh_alloc.cc (eh_alloc.cc:338)
    n1: 72704 0x40112DD: call_init.part.0 (in /usr/lib/ld-2.32.so)
     n1: 72704 0x40113C7: _dl_init (in /usr/lib/ld-2.32.so)
      n1: 72704 0x40020C9: ??? (in /usr/lib/ld-2.32.so)
       n1: 72704 0x1: ???
        n1: 72704 0x1FFF000AC6: ???
         n0: 72704 0x1FFF000AD9: ???
 n0: 1032 in 3 places, all below massif's threshold (1.00%)
 #-----------
 snapshot=20
 #-----------
 time=4899402
 mem_heap_B=204808
 mem_heap_extra_B=40
 mem_stacks_B=0
 heap_tree=empty
 #-----------
 snapshot=21
 #-----------
 time=5382780
 mem_heap_B=466952
 mem_heap_extra_B=48
 mem_stacks_B=0
 heap_tree=empty
 #-----------
 snapshot=22
 #-----------
 time=5513920
 mem_heap_B=466952
 mem_heap_extra_B=48
 mem_stacks_B=0
 heap_tree=peak
 n3: 466952 (heap allocation functions) malloc/new/new[], --alloc-fns, etc.
 n1: 393216 0x10A384: ??? (in /home/avril/work/shuffle3/lean/shuffle3-release)
  n1: 393216 0x109385: ??? (in /home/avril/work/shuffle3/lean/shuffle3-release)
   n0: 393216 0x4C6A151: (below main) (in /usr/lib/libc-2.32.so)
 n1: 72704 0x493F45A: pool (eh_alloc.cc:123)
  n1: 72704 0x493F45A: __static_initialization_and_destruction_0 (eh_alloc.cc:262)
   n1: 72704 0x493F45A: _GLOBAL__sub_I_eh_alloc.cc (eh_alloc.cc:338)
    n1: 72704 0x40112DD: call_init.part.0 (in /usr/lib/ld-2.32.so)
     n1: 72704 0x40113C7: _dl_init (in /usr/lib/ld-2.32.so)
      n1: 72704 0x40020C9: ??? (in /usr/lib/ld-2.32.so)
       n1: 72704 0x1: ???
        n1: 72704 0x1FFF000AC6: ???
         n0: 72704 0x1FFF000AD9: ???
 n0: 1032 in 3 places, all below massif's threshold (1.00%)
 #-----------
 snapshot=23
 #-----------
 time=5513920
 mem_heap_B=335880
 mem_heap_extra_B=40
 mem_stacks_B=0
 heap_tree=empty
 #-----------
 snapshot=24
 #-----------
 time=5892087
 mem_heap_B=73736
 mem_heap_extra_B=32
 mem_stacks_B=0
 heap_tree=empty
 #-----------
 snapshot=25
 #-----------
 time=5989421
 mem_heap_B=73744
 mem_heap_extra_B=48
 mem_stacks_B=0
 heap_tree=empty
 #-----------
 snapshot=26
 #-----------
 time=5996279
 mem_heap_B=73992
 mem_heap_extra_B=40
 mem_stacks_B=0
 heap_tree=empty
 #-----------
 snapshot=27
 #-----------
 time=6002698
 mem_heap_B=74248
 mem_heap_extra_B=40
 mem_stacks_B=0
 heap_tree=empty
 #-----------
 snapshot=28
 #-----------
 time=6015289
 mem_heap_B=75272
 mem_heap_extra_B=48
 mem_stacks_B=0
 heap_tree=empty
 #-----------
 snapshot=29
 #-----------
 time=6015414
 mem_heap_B=74760
 mem_heap_extra_B=40
 mem_stacks_B=0
 heap_tree=empty
 #-----------
 snapshot=30
 #-----------
 time=6040651
 mem_heap_B=76808
 mem_heap_extra_B=48
 mem_stacks_B=0
 heap_tree=empty
 #-----------
 snapshot=31
 #-----------
 time=6040828
 mem_heap_B=75784
 mem_heap_extra_B=40
 mem_stacks_B=0
 heap_tree=empty
 #-----------
 snapshot=32
 #-----------
 time=6091310
 mem_heap_B=79880
 mem_heap_extra_B=48
 mem_stacks_B=0
 heap_tree=detailed
 n4: 79880 (heap allocation functions) malloc/new/new[], --alloc-fns, etc.
 n1: 72704 0x493F45A: pool (eh_alloc.cc:123)
  n1: 72704 0x493F45A: __static_initialization_and_destruction_0 (eh_alloc.cc:262)
   n1: 72704 0x493F45A: _GLOBAL__sub_I_eh_alloc.cc (eh_alloc.cc:338)
    n1: 72704 0x40112DD: call_init.part.0 (in /usr/lib/ld-2.32.so)
     n1: 72704 0x40113C7: _dl_init (in /usr/lib/ld-2.32.so)
      n1: 72704 0x40020C9: ??? (in /usr/lib/ld-2.32.so)
       n1: 72704 0x1: ???
        n1: 72704 0x1FFF000AC6: ???
         n0: 72704 0x1FFF000AD9: ???
 n2: 6144 0x10A384: ??? (in /home/avril/work/shuffle3/lean/shuffle3-release)
  n1: 6144 0x1095C2: ??? (in /home/avril/work/shuffle3/lean/shuffle3-release)
   n0: 6144 0x4C6A151: (below main) (in /usr/lib/libc-2.32.so)
  n0: 0 in 1 place, below massif's threshold (1.00%)
 n1: 1024 0x4CB6E03: _IO_file_doallocate (in /usr/lib/libc-2.32.so)
  n1: 1024 0x4CC570F: _IO_doallocbuf (in /usr/lib/libc-2.32.so)
   n1: 1024 0x4CC48A7: _IO_file_overflow@@GLIBC_2.2.5 (in /usr/lib/libc-2.32.so)
    n1: 1024 0x4CC3955: _IO_file_xsputn@@GLIBC_2.2.5 (in /usr/lib/libc-2.32.so)
     n1: 1024 0x4CB8330: fwrite (in /usr/lib/libc-2.32.so)
      n1: 1024 0x4877FD7: fmt::v7::vprint(_IO_FILE*, fmt::v7::basic_string_view<char>, fmt::v7::format_args) (in /usr/lib/libfmt.so.7.1.2)
       n1: 1024 0x10A258: ??? (in /home/avril/work/shuffle3/lean/shuffle3-release)
        n1: 1024 0x10933E: ??? (in /home/avril/work/shuffle3/lean/shuffle3-release)
         n0: 1024 0x4C6A151: (below main) (in /usr/lib/libc-2.32.so)
 n0: 8 in 2 places, all below massif's threshold (1.00%)
 #-----------
 snapshot=33
 #-----------
 time=6091591
 mem_heap_B=77832
 mem_heap_extra_B=40
 mem_stacks_B=0
 heap_tree=empty
 #-----------
 snapshot=34
 #-----------
 time=6192490
 mem_heap_B=86024
 mem_heap_extra_B=48
 mem_stacks_B=0
 heap_tree=empty
 #-----------
 snapshot=35
 #-----------
 time=6196654
 mem_heap_B=81928
 mem_heap_extra_B=40
 mem_stacks_B=0
 heap_tree=empty
 #-----------
 snapshot=36
 #-----------
 time=6398233
 mem_heap_B=98312
 mem_heap_extra_B=48
 mem_stacks_B=0
 heap_tree=empty
 #-----------
 snapshot=37
 #-----------
 time=6406493
 mem_heap_B=90120
 mem_heap_extra_B=40
 mem_stacks_B=0
 heap_tree=empty
 #-----------
 snapshot=38
 #-----------
 time=6809904
 mem_heap_B=122888
 mem_heap_extra_B=48
 mem_stacks_B=0
 heap_tree=empty
 #-----------
 snapshot=39
 #-----------
 time=6826356
 mem_heap_B=106504
 mem_heap_extra_B=40
 mem_stacks_B=0
 heap_tree=empty
 #-----------
 snapshot=40
 #-----------
 time=7633039
 mem_heap_B=172040
 mem_heap_extra_B=48
 mem_stacks_B=0
 heap_tree=empty
 #-----------
 snapshot=41
 #-----------
 time=7665875
 mem_heap_B=139272
 mem_heap_extra_B=40
 mem_stacks_B=0
 heap_tree=empty
 #-----------
 snapshot=42
 #-----------
 time=7951930
 mem_heap_B=73736
 mem_heap_extra_B=32
 mem_stacks_B=0
 heap_tree=detailed
 n3: 73736 (heap allocation functions) malloc/new/new[], --alloc-fns, etc.
 n1: 72704 0x493F45A: pool (eh_alloc.cc:123)
  n1: 72704 0x493F45A: __static_initialization_and_destruction_0 (eh_alloc.cc:262)
   n1: 72704 0x493F45A: _GLOBAL__sub_I_eh_alloc.cc (eh_alloc.cc:338)
    n1: 72704 0x40112DD: call_init.part.0 (in /usr/lib/ld-2.32.so)
     n1: 72704 0x40113C7: _dl_init (in /usr/lib/ld-2.32.so)
      n1: 72704 0x40020C9: ??? (in /usr/lib/ld-2.32.so)
       n1: 72704 0x1: ???
        n1: 72704 0x1FFF000AC6: ???
         n0: 72704 0x1FFF000AD9: ???
 n1: 1024 0x4CB6E03: _IO_file_doallocate (in /usr/lib/libc-2.32.so)
  n1: 1024 0x4CC570F: _IO_doallocbuf (in /usr/lib/libc-2.32.so)
   n1: 1024 0x4CC48A7: _IO_file_overflow@@GLIBC_2.2.5 (in /usr/lib/libc-2.32.so)
    n1: 1024 0x4CC3955: _IO_file_xsputn@@GLIBC_2.2.5 (in /usr/lib/libc-2.32.so)
     n1: 1024 0x4CB8330: fwrite (in /usr/lib/libc-2.32.so)
      n1: 1024 0x4877FD7: fmt::v7::vprint(_IO_FILE*, fmt::v7::basic_string_view<char>, fmt::v7::format_args) (in /usr/lib/libfmt.so.7.1.2)
       n1: 1024 0x10A258: ??? (in /home/avril/work/shuffle3/lean/shuffle3-release)
        n1: 1024 0x10933E: ??? (in /home/avril/work/shuffle3/lean/shuffle3-release)
         n0: 1024 0x4C6A151: (below main) (in /usr/lib/libc-2.32.so)
 n0: 8 in 3 places, all below massif's threshold (1.00%)
 #-----------
 snapshot=43
 #-----------
 time=7971885
 mem_heap_B=73744
 mem_heap_extra_B=48
 mem_stacks_B=0
 heap_tree=empty
 #-----------
 snapshot=44
 #-----------
 time=7979276
 mem_heap_B=75784
 mem_heap_extra_B=40
 mem_stacks_B=0
 heap_tree=empty
 #-----------
 snapshot=45
 #-----------
 time=7985879
 mem_heap_B=77832
 mem_heap_extra_B=40
 mem_stacks_B=0
 heap_tree=empty
 #-----------
 snapshot=46
 #-----------
 time=7998473
 mem_heap_B=86024
 mem_heap_extra_B=48
 mem_stacks_B=0
 heap_tree=detailed
 n4: 86024 (heap allocation functions) malloc/new/new[], --alloc-fns, etc.
 n1: 72704 0x493F45A: pool (eh_alloc.cc:123)
  n1: 72704 0x493F45A: __static_initialization_and_destruction_0 (eh_alloc.cc:262)
   n1: 72704 0x493F45A: _GLOBAL__sub_I_eh_alloc.cc (eh_alloc.cc:338)
    n1: 72704 0x40112DD: call_init.part.0 (in /usr/lib/ld-2.32.so)
     n1: 72704 0x40113C7: _dl_init (in /usr/lib/ld-2.32.so)
      n1: 72704 0x40020C9: ??? (in /usr/lib/ld-2.32.so)
       n1: 72704 0x1: ???
        n1: 72704 0x1FFF000AC6: ???
         n0: 72704 0x1FFF000AD9: ???
 n2: 12288 0x10A384: ??? (in /home/avril/work/shuffle3/lean/shuffle3-release)
  n1: 12288 0x10973E: ??? (in /home/avril/work/shuffle3/lean/shuffle3-release)
   n0: 12288 0x4C6A151: (below main) (in /usr/lib/libc-2.32.so)
  n0: 0 in 2 places, all below massif's threshold (1.00%)
 n1: 1024 0x4CB6E03: _IO_file_doallocate (in /usr/lib/libc-2.32.so)
  n1: 1024 0x4CC570F: _IO_doallocbuf (in /usr/lib/libc-2.32.so)
   n1: 1024 0x4CC48A7: _IO_file_overflow@@GLIBC_2.2.5 (in /usr/lib/libc-2.32.so)
    n1: 1024 0x4CC3955: _IO_file_xsputn@@GLIBC_2.2.5 (in /usr/lib/libc-2.32.so)
     n1: 1024 0x4CB8330: fwrite (in /usr/lib/libc-2.32.so)
      n1: 1024 0x4877FD7: fmt::v7::vprint(_IO_FILE*, fmt::v7::basic_string_view<char>, fmt::v7::format_args) (in /usr/lib/libfmt.so.7.1.2)
       n1: 1024 0x10A258: ??? (in /home/avril/work/shuffle3/lean/shuffle3-release)
        n1: 1024 0x10933E: ??? (in /home/avril/work/shuffle3/lean/shuffle3-release)
         n0: 1024 0x4C6A151: (below main) (in /usr/lib/libc-2.32.so)
 n0: 8 in 2 places, all below massif's threshold (1.00%)
 #-----------
 snapshot=47
 #-----------
 time=8002637
 mem_heap_B=81928
 mem_heap_extra_B=40
 mem_stacks_B=0
 heap_tree=empty
 #-----------
 snapshot=48
 #-----------
 time=8027775
 mem_heap_B=98312
 mem_heap_extra_B=48
 mem_stacks_B=0
 heap_tree=empty
 #-----------
 snapshot=49
 #-----------
 time=8036035
 mem_heap_B=90120
 mem_heap_extra_B=40
 mem_stacks_B=0
 heap_tree=empty
 #-----------
 snapshot=50
 #-----------
 time=8086261
 mem_heap_B=122888
 mem_heap_extra_B=48
 mem_stacks_B=0
 heap_tree=empty
 #-----------
 snapshot=51
 #-----------
 time=8102713
 mem_heap_B=106504
 mem_heap_extra_B=40
 mem_stacks_B=0
 heap_tree=empty
 #-----------
 snapshot=52
 #-----------
 time=8147526
 mem_heap_B=73736
 mem_heap_extra_B=32
 mem_stacks_B=0
 heap_tree=empty
 #-----------
 snapshot=53
 #-----------
 time=8156172
 mem_heap_B=1032
 mem_heap_extra_B=24
 mem_stacks_B=0
 heap_tree=empty
 #-----------
 snapshot=54
 #-----------
 time=8157131
 mem_heap_B=8
 mem_heap_extra_B=16
 mem_stacks_B=0
 heap_tree=empty
--- a/profiling/mem-small.png
+++ b/profiling/mem-small.png
--- a/profiling/mem-smallu.png
+++ b/profiling/mem-smallu.png
--- a/profiling/mem.png
+++ b/profiling/mem.png
--- a/profiling/old-mem-small.png
+++ b/profiling/old-mem-small.png
--- a/profiling/old-mem-smallu.png
+++ b/profiling/old-mem-smallu.png
--- a/profiling/old-mem.png
+++ b/profiling/old-mem.png
--- a/profiling/release-flame-old.svg
+++ b/profiling/release-flame-old.svg
--- a/profiling/release-flame.svg
+++ b/profiling/release-flame.svg
@ -0,0 +1,419 @@
 <?xml version="1.0" standalone="no"?><!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd"><svg version="1.1" width="1200" height="182" onload="init(evt)" viewBox="0 0 1200 182" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink"><!--Flame graph stack visualization. See https://github.com/brendangregg/FlameGraph for latest version, and http://www.brendangregg.com/flamegraphs.html for examples.--><!--NOTES: --><defs><linearGradient id="background" y1="0" y2="1" x1="0" x2="0"><stop stop-color="#eeeeee" offset="5%"/><stop stop-color="#eeeeb0" offset="95%"/></linearGradient></defs><style type="text/css">
 text { font-family:"Verdana"; font-size:12px; fill:rgb(0,0,0); }
 #title { text-anchor:middle; font-size:17px; }
 #search { opacity:0.1; cursor:pointer; }
 #search:hover, #search.show { opacity:1; }
 #subtitle { text-anchor:middle; font-color:rgb(160,160,160); }
 #unzoom { cursor:pointer; }
 #frames > *:hover { stroke:black; stroke-width:0.5; cursor:pointer; }
 .hide { display:none; }
 .parent { opacity:0.5; }
 </style><script type="text/ecmascript"><![CDATA[var nametype = 'Function:';
 var fontsize = 12;
 var fontwidth = 0.59;
 var xpad = 10;
 var inverted = false;
 var searchcolor = 'rgb(230,0,230)';
 var fluiddrawing = true;
 var truncate_text_right = false;]]><![CDATA["use strict";
 var details, searchbtn, unzoombtn, matchedtxt, svg, searching, frames;
 function init(evt) {
    details = document.getElementById("details").firstChild;
    searchbtn = document.getElementById("search");
    unzoombtn = document.getElementById("unzoom");
    matchedtxt = document.getElementById("matched");
    svg = document.getElementsByTagName("svg")[0];
    frames = document.getElementById("frames");
    searching = 0;
    // Use GET parameters to restore a flamegraph's state.
    var restore_state = function() {
        var params = get_params();
        if (params.x && params.y)
            zoom(find_group(document.querySelector('[x="' + params.x + '"][y="' + params.y + '"]')));
        if (params.s)
            search(params.s);
    };
    if (fluiddrawing) {
        // Make width dynamic so the SVG fits its parent's width.
        svg.removeAttribute("width");
        // Edge requires us to have a viewBox that gets updated with size changes.
        var isEdge = /Edge\/\d./i.test(navigator.userAgent);
        if (!isEdge) {
          svg.removeAttribute("viewBox");
        }
        var update_for_width_change = function() {
            if (isEdge) {
                svg.attributes.viewBox.value = "0 0 " + svg.width.baseVal.value + " " + svg.height.baseVal.value;
            }
            // Keep consistent padding on left and right of frames container.
            frames.attributes.width.value = svg.width.baseVal.value - xpad * 2;
            // Text truncation needs to be adjusted for the current width.
            var el = frames.children;
            for(var i = 0; i < el.length; i++) {
                update_text(el[i]);
            }
            // Keep search elements at a fixed distance from right edge.
            var svgWidth = svg.width.baseVal.value;
            searchbtn.attributes.x.value = svgWidth - xpad - 100;
            matchedtxt.attributes.x.value = svgWidth - xpad - 100;
        };
        window.addEventListener('resize', function() {
            update_for_width_change();
        });
        // This needs to be done asynchronously for Safari to work.
        setTimeout(function() {
            unzoom();
            update_for_width_change();
            restore_state();
        }, 0);
    } else {
        restore_state();
    }
 }
 // event listeners
 window.addEventListener("click", function(e) {
    var target = find_group(e.target);
    if (target) {
        if (target.nodeName == "a") {
            if (e.ctrlKey === false) return;
            e.preventDefault();
        }
        if (target.classList.contains("parent")) unzoom();
        zoom(target);
        // set parameters for zoom state
        var el = target.querySelector("rect");
        if (el && el.attributes && el.attributes.y && el.attributes._orig_x) {
            var params = get_params()
            params.x = el.attributes._orig_x.value;
            params.y = el.attributes.y.value;
            history.replaceState(null, null, parse_params(params));
        }
    }
    else if (e.target.id == "unzoom") {
        unzoom();
        // remove zoom state
        var params = get_params();
        if (params.x) delete params.x;
        if (params.y) delete params.y;
        history.replaceState(null, null, parse_params(params));
    }
    else if (e.target.id == "search") search_prompt();
 }, false)
 // mouse-over for info
 // show
 window.addEventListener("mouseover", function(e) {
    var target = find_group(e.target);
    if (target) details.nodeValue = nametype + " " + g_to_text(target);
 }, false)
 // clear
 window.addEventListener("mouseout", function(e) {
    var target = find_group(e.target);
    if (target) details.nodeValue = ' ';
 }, false)
 // ctrl-F for search
 window.addEventListener("keydown",function (e) {
    if (e.keyCode === 114 || (e.ctrlKey && e.keyCode === 70)) {
        e.preventDefault();
        search_prompt();
    }
 }, false)
 // functions
 function get_params() {
    var params = {};
    var paramsarr = window.location.search.substr(1).split('&');
    for (var i = 0; i < paramsarr.length; ++i) {
        var tmp = paramsarr[i].split("=");
        if (!tmp[0] || !tmp[1]) continue;
        params[tmp[0]]  = decodeURIComponent(tmp[1]);
    }
    return params;
 }
 function parse_params(params) {
    var uri = "?";
    for (var key in params) {
        uri += key + '=' + encodeURIComponent(params[key]) + '&';
    }
    if (uri.slice(-1) == "&")
        uri = uri.substring(0, uri.length - 1);
    if (uri == '?')
        uri = window.location.href.split('?')[0];
    return uri;
 }
 function find_child(node, selector) {
    var children = node.querySelectorAll(selector);
    if (children.length) return children[0];
    return;
 }
 function find_group(node) {
    var parent = node.parentElement;
    if (!parent) return;
    if (parent.id == "frames") return node;
    return find_group(parent);
 }
 function orig_save(e, attr, val) {
    if (e.attributes["_orig_" + attr] != undefined) return;
    if (e.attributes[attr] == undefined) return;
    if (val == undefined) val = e.attributes[attr].value;
    e.setAttribute("_orig_" + attr, val);
 }
 function orig_load(e, attr) {
    if (e.attributes["_orig_"+attr] == undefined) return;
    e.attributes[attr].value = e.attributes["_orig_" + attr].value;
    e.removeAttribute("_orig_" + attr);
 }
 function g_to_text(e) {
    var text = find_child(e, "title").firstChild.nodeValue;
    return (text)
 }
 function g_to_func(e) {
    var func = g_to_text(e);
    // if there's any manipulation we want to do to the function
    // name before it's searched, do it here before returning.
    return (func);
 }
 function update_text(e) {
    var r = find_child(e, "rect");
    var t = find_child(e, "text");
    var w = parseFloat(r.attributes.width.value) * frames.attributes.width.value / 100 - 3;
    var txt = find_child(e, "title").textContent.replace(/\([^(]*\)$/,"");
    t.attributes.x.value = format_percent((parseFloat(r.attributes.x.value) + (100 * 3 / frames.attributes.width.value)));
    // Smaller than this size won't fit anything
    if (w < 2 * fontsize * fontwidth) {
        t.textContent = "";
        return;
    }
    t.textContent = txt;
    // Fit in full text width
    if (/^ *\$/.test(txt) || t.getComputedTextLength() < w)
        return;
    if (truncate_text_right) {
        // Truncate the right side of the text.
        for (var x = txt.length - 2; x > 0; x--) {
            if (t.getSubStringLength(0, x + 2) <= w) {
                t.textContent = txt.substring(0, x) + "..";
                return;
            }
        }
    } else {
        // Truncate the left side of the text.
        for (var x = 2; x < txt.length; x++) {
            if (t.getSubStringLength(x - 2, txt.length) <= w) {
                t.textContent = ".." + txt.substring(x, txt.length);
                return;
            }
        }
    }
    t.textContent = "";
 }
 // zoom
 function zoom_reset(e) {
    if (e.attributes != undefined) {
        orig_load(e, "x");
        orig_load(e, "width");
    }
    if (e.childNodes == undefined) return;
    for(var i = 0, c = e.childNodes; i < c.length; i++) {
        zoom_reset(c[i]);
    }
 }
 function zoom_child(e, x, ratio) {
    if (e.attributes != undefined) {
        if (e.attributes.x != undefined) {
            orig_save(e, "x");
            e.attributes.x.value = format_percent((parseFloat(e.attributes.x.value) - x) * ratio);
            if (e.tagName == "text") {
                e.attributes.x.value = format_percent(parseFloat(find_child(e.parentNode, "rect[x]").attributes.x.value) + (100 * 3 / frames.attributes.width.value));
            }
        }
        if (e.attributes.width != undefined) {
            orig_save(e, "width");
            e.attributes.width.value = format_percent(parseFloat(e.attributes.width.value) * ratio);
        }
    }
    if (e.childNodes == undefined) return;
    for(var i = 0, c = e.childNodes; i < c.length; i++) {
        zoom_child(c[i], x, ratio);
    }
 }
 function zoom_parent(e) {
    if (e.attributes) {
        if (e.attributes.x != undefined) {
            orig_save(e, "x");
            e.attributes.x.value = "0.0%";
        }
        if (e.attributes.width != undefined) {
            orig_save(e, "width");
            e.attributes.width.value = "100.0%";
        }
    }
    if (e.childNodes == undefined) return;
    for(var i = 0, c = e.childNodes; i < c.length; i++) {
        zoom_parent(c[i]);
    }
 }
 function zoom(node) {
    var attr = find_child(node, "rect").attributes;
    var width = parseFloat(attr.width.value);
    var xmin = parseFloat(attr.x.value);
    var xmax = xmin + width;
    var ymin = parseFloat(attr.y.value);
    var ratio = 100 / width;
    // XXX: Workaround for JavaScript float issues (fix me)
    var fudge = 0.001;
    unzoombtn.classList.remove("hide");
    var el = frames.children;
    for (var i = 0; i < el.length; i++) {
        var e = el[i];
        var a = find_child(e, "rect").attributes;
        var ex = parseFloat(a.x.value);
        var ew = parseFloat(a.width.value);
        // Is it an ancestor
        if (!inverted) {
            var upstack = parseFloat(a.y.value) > ymin;
        } else {
            var upstack = parseFloat(a.y.value) < ymin;
        }
        if (upstack) {
            // Direct ancestor
            if (ex <= xmin && (ex+ew+fudge) >= xmax) {
                e.classList.add("parent");
                zoom_parent(e);
                update_text(e);
            }
            // not in current path
            else
                e.classList.add("hide");
        }
        // Children maybe
        else {
            // no common path
            if (ex < xmin || ex + fudge >= xmax) {
                e.classList.add("hide");
            }
            else {
                zoom_child(e, xmin, ratio);
                update_text(e);
            }
        }
    }
 }
 function unzoom() {
    unzoombtn.classList.add("hide");
    var el = frames.children;
    for(var i = 0; i < el.length; i++) {
        el[i].classList.remove("parent");
        el[i].classList.remove("hide");
        zoom_reset(el[i]);
        update_text(el[i]);
    }
 }
 // search
 function reset_search() {
    var el = document.querySelectorAll("#frames rect");
    for (var i = 0; i < el.length; i++) {
        orig_load(el[i], "fill")
    }
    var params = get_params();
    delete params.s;
    history.replaceState(null, null, parse_params(params));
 }
 function search_prompt() {
    if (!searching) {
        var term = prompt("Enter a search term (regexp " +
            "allowed, eg: ^ext4_)", "");
        if (term != null) {
            search(term)
        }
    } else {
        reset_search();
        searching = 0;
        searchbtn.classList.remove("show");
        searchbtn.firstChild.nodeValue = "Search"
        matchedtxt.classList.add("hide");
        matchedtxt.firstChild.nodeValue = ""
    }
 }
 function search(term) {
    var re = new RegExp(term);
    var el = frames.children;
    var matches = new Object();
    var maxwidth = 0;
    for (var i = 0; i < el.length; i++) {
        var e = el[i];
        var func = g_to_func(e);
        var rect = find_child(e, "rect");
        if (func == null || rect == null)
            continue;
        // Save max width. Only works as we have a root frame
        var w = parseFloat(rect.attributes.width.value);
        if (w > maxwidth)
            maxwidth = w;
        if (func.match(re)) {
            // highlight
            var x = parseFloat(rect.attributes.x.value);
            orig_save(rect, "fill");
            rect.attributes.fill.value = searchcolor;
            // remember matches
            if (matches[x] == undefined) {
                matches[x] = w;
            } else {
                if (w > matches[x]) {
                    // overwrite with parent
                    matches[x] = w;
                }
            }
            searching = 1;
        }
    }
    if (!searching)
        return;
    var params = get_params();
    params.s = term;
    history.replaceState(null, null, parse_params(params));
    searchbtn.classList.add("show");
    searchbtn.firstChild.nodeValue = "Reset Search";
    // calculate percent matched, excluding vertical overlap
    var count = 0;
    var lastx = -1;
    var lastw = 0;
    var keys = Array();
    for (k in matches) {
        if (matches.hasOwnProperty(k))
            keys.push(k);
    }
    // sort the matched frames by their x location
    // ascending, then width descending
    keys.sort(function(a, b){
        return a - b;
    });
    // Step through frames saving only the biggest bottom-up frames
    // thanks to the sort order. This relies on the tree property
    // where children are always smaller than their parents.
    var fudge = 0.0001;    // JavaScript floating point
    for (var k in keys) {
        var x = parseFloat(keys[k]);
        var w = matches[keys[k]];
        if (x >= lastx + lastw - fudge) {
            count += w;
            lastx = x;
            lastw = w;
        }
    }
    // display matched percent
    matchedtxt.classList.remove("hide");
    var pct = 100 * count / maxwidth;
    if (pct != 100) pct = pct.toFixed(1);
    matchedtxt.firstChild.nodeValue = "Matched: " + pct + "%";
 }
 function format_percent(n) {
    return n.toFixed(4) + "%";
 }
 ]]></script><rect x="0" y="0" width="100%" height="182" fill="url(#background)"/><text id="title" x="50.0000%" y="24.00">Flame Graph</text><text id="details" x="10" y="165.00"> </text><text id="unzoom" class="hide" x="10" y="24.00">Reset Zoom</text><text id="search" x="1090" y="24.00">Search</text><text id="matched" x="1090" y="165.00"> </text><svg id="frames" x="10" width="1180"><g><title>[libm-2.32.so] (9 samples, 26.47%)</title><rect x="58.8235%" y="53" width="26.4706%" height="15" fill="rgb(227,0,7)"/><text x="59.0735%" y="63.50">[libm-2.32.so]</text></g><g><title>__libc_start_main (29 samples, 85.29%)</title><rect x="11.7647%" y="85" width="85.2941%" height="15" fill="rgb(217,0,24)"/><text x="12.0147%" y="95.50">__libc_start_main</text></g><g><title>main (29 samples, 85.29%)</title><rect x="11.7647%" y="69" width="85.2941%" height="15" fill="rgb(221,193,54)"/><text x="12.0147%" y="79.50">main</text></g><g><title>rand_r (4 samples, 11.76%)</title><rect x="85.2941%" y="53" width="11.7647%" height="15" fill="rgb(248,212,6)"/><text x="85.5441%" y="63.50">rand_r</text></g><g><title>all (34 samples, 100%)</title><rect x="0.0000%" y="133" width="100.0000%" height="15" fill="rgb(208,68,35)"/><text x="0.2500%" y="143.50"></text></g><g><title>shuffle3-releas (34 samples, 100.00%)</title><rect x="0.0000%" y="117" width="100.0000%" height="15" fill="rgb(232,128,0)"/><text x="0.2500%" y="127.50">shuffle3-releas</text></g><g><title>_start (34 samples, 100.00%)</title><rect x="0.0000%" y="101" width="100.0000%" height="15" fill="rgb(207,160,47)"/><text x="0.2500%" y="111.50">_start</text></g><g><title>_dl_start (1 samples, 2.94%)</title><rect x="97.0588%" y="85" width="2.9412%" height="15" fill="rgb(228,23,34)"/><text x="97.3088%" y="95.50">_d..</text></g><g><title>_dl_sysdep_start (1 samples, 2.94%)</title><rect x="97.0588%" y="69" width="2.9412%" height="15" fill="rgb(218,30,26)"/><text x="97.3088%" y="79.50">_d..</text></g><g><title>dl_main (1 samples, 2.94%)</title><rect x="97.0588%" y="53" width="2.9412%" height="15" fill="rgb(220,122,19)"/><text x="97.3088%" y="63.50">dl..</text></g><g><title>_dl_lookup_symbol_x (1 samples, 2.94%)</title><rect x="97.0588%" y="37" width="2.9412%" height="15" fill="rgb(250,228,42)"/><text x="97.3088%" y="47.50">_d..</text></g></svg></svg>
--- a/profiling/release-flameu.svg
+++ b/profiling/release-flameu.svg
@ -0,0 +1,419 @@
 <?xml version="1.0" standalone="no"?><!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd"><svg version="1.1" width="1200" height="214" onload="init(evt)" viewBox="0 0 1200 214" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink"><!--Flame graph stack visualization. See https://github.com/brendangregg/FlameGraph for latest version, and http://www.brendangregg.com/flamegraphs.html for examples.--><!--NOTES: --><defs><linearGradient id="background" y1="0" y2="1" x1="0" x2="0"><stop stop-color="#eeeeee" offset="5%"/><stop stop-color="#eeeeb0" offset="95%"/></linearGradient></defs><style type="text/css">
 text { font-family:"Verdana"; font-size:12px; fill:rgb(0,0,0); }
 #title { text-anchor:middle; font-size:17px; }
 #search { opacity:0.1; cursor:pointer; }
 #search:hover, #search.show { opacity:1; }
 #subtitle { text-anchor:middle; font-color:rgb(160,160,160); }
 #unzoom { cursor:pointer; }
 #frames > *:hover { stroke:black; stroke-width:0.5; cursor:pointer; }
 .hide { display:none; }
 .parent { opacity:0.5; }
 </style><script type="text/ecmascript"><![CDATA[var nametype = 'Function:';
 var fontsize = 12;
 var fontwidth = 0.59;
 var xpad = 10;
 var inverted = false;
 var searchcolor = 'rgb(230,0,230)';
 var fluiddrawing = true;
 var truncate_text_right = false;]]><![CDATA["use strict";
 var details, searchbtn, unzoombtn, matchedtxt, svg, searching, frames;
 function init(evt) {
    details = document.getElementById("details").firstChild;
    searchbtn = document.getElementById("search");
    unzoombtn = document.getElementById("unzoom");
    matchedtxt = document.getElementById("matched");
    svg = document.getElementsByTagName("svg")[0];
    frames = document.getElementById("frames");
    searching = 0;
    // Use GET parameters to restore a flamegraph's state.
    var restore_state = function() {
        var params = get_params();
        if (params.x && params.y)
            zoom(find_group(document.querySelector('[x="' + params.x + '"][y="' + params.y + '"]')));
        if (params.s)
            search(params.s);
    };
    if (fluiddrawing) {
        // Make width dynamic so the SVG fits its parent's width.
        svg.removeAttribute("width");
        // Edge requires us to have a viewBox that gets updated with size changes.
        var isEdge = /Edge\/\d./i.test(navigator.userAgent);
        if (!isEdge) {
          svg.removeAttribute("viewBox");
        }
        var update_for_width_change = function() {
            if (isEdge) {
                svg.attributes.viewBox.value = "0 0 " + svg.width.baseVal.value + " " + svg.height.baseVal.value;
            }
            // Keep consistent padding on left and right of frames container.
            frames.attributes.width.value = svg.width.baseVal.value - xpad * 2;
            // Text truncation needs to be adjusted for the current width.
            var el = frames.children;
            for(var i = 0; i < el.length; i++) {
                update_text(el[i]);
            }
            // Keep search elements at a fixed distance from right edge.
            var svgWidth = svg.width.baseVal.value;
            searchbtn.attributes.x.value = svgWidth - xpad - 100;
            matchedtxt.attributes.x.value = svgWidth - xpad - 100;
        };
        window.addEventListener('resize', function() {
            update_for_width_change();
        });
        // This needs to be done asynchronously for Safari to work.
        setTimeout(function() {
            unzoom();
            update_for_width_change();
            restore_state();
        }, 0);
    } else {
        restore_state();
    }
 }
 // event listeners
 window.addEventListener("click", function(e) {
    var target = find_group(e.target);
    if (target) {
        if (target.nodeName == "a") {
            if (e.ctrlKey === false) return;
            e.preventDefault();
        }
        if (target.classList.contains("parent")) unzoom();
        zoom(target);
        // set parameters for zoom state
        var el = target.querySelector("rect");
        if (el && el.attributes && el.attributes.y && el.attributes._orig_x) {
            var params = get_params()
            params.x = el.attributes._orig_x.value;
            params.y = el.attributes.y.value;
            history.replaceState(null, null, parse_params(params));
        }
    }
    else if (e.target.id == "unzoom") {
        unzoom();
        // remove zoom state
        var params = get_params();
        if (params.x) delete params.x;
        if (params.y) delete params.y;
        history.replaceState(null, null, parse_params(params));
    }
    else if (e.target.id == "search") search_prompt();
 }, false)
 // mouse-over for info
 // show
 window.addEventListener("mouseover", function(e) {
    var target = find_group(e.target);
    if (target) details.nodeValue = nametype + " " + g_to_text(target);
 }, false)
 // clear
 window.addEventListener("mouseout", function(e) {
    var target = find_group(e.target);
    if (target) details.nodeValue = ' ';
 }, false)
 // ctrl-F for search
 window.addEventListener("keydown",function (e) {
    if (e.keyCode === 114 || (e.ctrlKey && e.keyCode === 70)) {
        e.preventDefault();
        search_prompt();
    }
 }, false)
 // functions
 function get_params() {
    var params = {};
    var paramsarr = window.location.search.substr(1).split('&');
    for (var i = 0; i < paramsarr.length; ++i) {
        var tmp = paramsarr[i].split("=");
        if (!tmp[0] || !tmp[1]) continue;
        params[tmp[0]]  = decodeURIComponent(tmp[1]);
    }
    return params;
 }
 function parse_params(params) {
    var uri = "?";
    for (var key in params) {
        uri += key + '=' + encodeURIComponent(params[key]) + '&';
    }
    if (uri.slice(-1) == "&")
        uri = uri.substring(0, uri.length - 1);
    if (uri == '?')
        uri = window.location.href.split('?')[0];
    return uri;
 }
 function find_child(node, selector) {
    var children = node.querySelectorAll(selector);
    if (children.length) return children[0];
    return;
 }
 function find_group(node) {
    var parent = node.parentElement;
    if (!parent) return;
    if (parent.id == "frames") return node;
    return find_group(parent);
 }
 function orig_save(e, attr, val) {
    if (e.attributes["_orig_" + attr] != undefined) return;
    if (e.attributes[attr] == undefined) return;
    if (val == undefined) val = e.attributes[attr].value;
    e.setAttribute("_orig_" + attr, val);
 }
 function orig_load(e, attr) {
    if (e.attributes["_orig_"+attr] == undefined) return;
    e.attributes[attr].value = e.attributes["_orig_" + attr].value;
    e.removeAttribute("_orig_" + attr);
 }
 function g_to_text(e) {
    var text = find_child(e, "title").firstChild.nodeValue;
    return (text)
 }
 function g_to_func(e) {
    var func = g_to_text(e);
    // if there's any manipulation we want to do to the function
    // name before it's searched, do it here before returning.
    return (func);
 }
 function update_text(e) {
    var r = find_child(e, "rect");
    var t = find_child(e, "text");
    var w = parseFloat(r.attributes.width.value) * frames.attributes.width.value / 100 - 3;
    var txt = find_child(e, "title").textContent.replace(/\([^(]*\)$/,"");
    t.attributes.x.value = format_percent((parseFloat(r.attributes.x.value) + (100 * 3 / frames.attributes.width.value)));
    // Smaller than this size won't fit anything
    if (w < 2 * fontsize * fontwidth) {
        t.textContent = "";
        return;
    }
    t.textContent = txt;
    // Fit in full text width
    if (/^ *\$/.test(txt) || t.getComputedTextLength() < w)
        return;
    if (truncate_text_right) {
        // Truncate the right side of the text.
        for (var x = txt.length - 2; x > 0; x--) {
            if (t.getSubStringLength(0, x + 2) <= w) {
                t.textContent = txt.substring(0, x) + "..";
                return;
            }
        }
    } else {
        // Truncate the left side of the text.
        for (var x = 2; x < txt.length; x++) {
            if (t.getSubStringLength(x - 2, txt.length) <= w) {
                t.textContent = ".." + txt.substring(x, txt.length);
                return;
            }
        }
    }
    t.textContent = "";
 }
 // zoom
 function zoom_reset(e) {
    if (e.attributes != undefined) {
        orig_load(e, "x");
        orig_load(e, "width");
    }
    if (e.childNodes == undefined) return;
    for(var i = 0, c = e.childNodes; i < c.length; i++) {
        zoom_reset(c[i]);
    }
 }
 function zoom_child(e, x, ratio) {
    if (e.attributes != undefined) {
        if (e.attributes.x != undefined) {
            orig_save(e, "x");
            e.attributes.x.value = format_percent((parseFloat(e.attributes.x.value) - x) * ratio);
            if (e.tagName == "text") {
                e.attributes.x.value = format_percent(parseFloat(find_child(e.parentNode, "rect[x]").attributes.x.value) + (100 * 3 / frames.attributes.width.value));
            }
        }
        if (e.attributes.width != undefined) {
            orig_save(e, "width");
            e.attributes.width.value = format_percent(parseFloat(e.attributes.width.value) * ratio);
        }
    }
    if (e.childNodes == undefined) return;
    for(var i = 0, c = e.childNodes; i < c.length; i++) {
        zoom_child(c[i], x, ratio);
    }
 }
 function zoom_parent(e) {
    if (e.attributes) {
        if (e.attributes.x != undefined) {
            orig_save(e, "x");
            e.attributes.x.value = "0.0%";
        }
        if (e.attributes.width != undefined) {
            orig_save(e, "width");
            e.attributes.width.value = "100.0%";
        }
    }
    if (e.childNodes == undefined) return;
    for(var i = 0, c = e.childNodes; i < c.length; i++) {
        zoom_parent(c[i]);
    }
 }
 function zoom(node) {
    var attr = find_child(node, "rect").attributes;
    var width = parseFloat(attr.width.value);
    var xmin = parseFloat(attr.x.value);
    var xmax = xmin + width;
    var ymin = parseFloat(attr.y.value);
    var ratio = 100 / width;
    // XXX: Workaround for JavaScript float issues (fix me)
    var fudge = 0.001;
    unzoombtn.classList.remove("hide");
    var el = frames.children;
    for (var i = 0; i < el.length; i++) {
        var e = el[i];
        var a = find_child(e, "rect").attributes;
        var ex = parseFloat(a.x.value);
        var ew = parseFloat(a.width.value);
        // Is it an ancestor
        if (!inverted) {
            var upstack = parseFloat(a.y.value) > ymin;
        } else {
            var upstack = parseFloat(a.y.value) < ymin;
        }
        if (upstack) {
            // Direct ancestor
            if (ex <= xmin && (ex+ew+fudge) >= xmax) {
                e.classList.add("parent");
                zoom_parent(e);
                update_text(e);
            }
            // not in current path
            else
                e.classList.add("hide");
        }
        // Children maybe
        else {
            // no common path
            if (ex < xmin || ex + fudge >= xmax) {
                e.classList.add("hide");
            }
            else {
                zoom_child(e, xmin, ratio);
                update_text(e);
            }
        }
    }
 }
 function unzoom() {
    unzoombtn.classList.add("hide");
    var el = frames.children;
    for(var i = 0; i < el.length; i++) {
        el[i].classList.remove("parent");
        el[i].classList.remove("hide");
        zoom_reset(el[i]);
        update_text(el[i]);
    }
 }
 // search
 function reset_search() {
    var el = document.querySelectorAll("#frames rect");
    for (var i = 0; i < el.length; i++) {
        orig_load(el[i], "fill")
    }
    var params = get_params();
    delete params.s;
    history.replaceState(null, null, parse_params(params));
 }
 function search_prompt() {
    if (!searching) {
        var term = prompt("Enter a search term (regexp " +
            "allowed, eg: ^ext4_)", "");
        if (term != null) {
            search(term)
        }
    } else {
        reset_search();
        searching = 0;
        searchbtn.classList.remove("show");
        searchbtn.firstChild.nodeValue = "Search"
        matchedtxt.classList.add("hide");
        matchedtxt.firstChild.nodeValue = ""
    }
 }
 function search(term) {
    var re = new RegExp(term);
    var el = frames.children;
    var matches = new Object();
    var maxwidth = 0;
    for (var i = 0; i < el.length; i++) {
        var e = el[i];
        var func = g_to_func(e);
        var rect = find_child(e, "rect");
        if (func == null || rect == null)
            continue;
        // Save max width. Only works as we have a root frame
        var w = parseFloat(rect.attributes.width.value);
        if (w > maxwidth)
            maxwidth = w;
        if (func.match(re)) {
            // highlight
            var x = parseFloat(rect.attributes.x.value);
            orig_save(rect, "fill");
            rect.attributes.fill.value = searchcolor;
            // remember matches
            if (matches[x] == undefined) {
                matches[x] = w;
            } else {
                if (w > matches[x]) {
                    // overwrite with parent
                    matches[x] = w;
                }
            }
            searching = 1;
        }
    }
    if (!searching)
        return;
    var params = get_params();
    params.s = term;
    history.replaceState(null, null, parse_params(params));
    searchbtn.classList.add("show");
    searchbtn.firstChild.nodeValue = "Reset Search";
    // calculate percent matched, excluding vertical overlap
    var count = 0;
    var lastx = -1;
    var lastw = 0;
    var keys = Array();
    for (k in matches) {
        if (matches.hasOwnProperty(k))
            keys.push(k);
    }
    // sort the matched frames by their x location
    // ascending, then width descending
    keys.sort(function(a, b){
        return a - b;
    });
    // Step through frames saving only the biggest bottom-up frames
    // thanks to the sort order. This relies on the tree property
    // where children are always smaller than their parents.
    var fudge = 0.0001;    // JavaScript floating point
    for (var k in keys) {
        var x = parseFloat(keys[k]);
        var w = matches[keys[k]];
        if (x >= lastx + lastw - fudge) {
            count += w;
            lastx = x;
            lastw = w;
        }
    }
    // display matched percent
    matchedtxt.classList.remove("hide");
    var pct = 100 * count / maxwidth;
    if (pct != 100) pct = pct.toFixed(1);
    matchedtxt.firstChild.nodeValue = "Matched: " + pct + "%";
 }
 function format_percent(n) {
    return n.toFixed(4) + "%";
 }
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