| `memfile` | Use an in-memory file-descriptor pointing to unmapped physical pages of memory. This will allow the program to make use of the more efficient `splice()` and `send_file()` syscalls where possible. | **WARNING**: Can potentially cause a *full system OOM* if used incorrectly or irresponsibly. (See below) |
| `memfile-preallocate` | `memfile`, but when unable to determine the size of `stdin`, will pre-allocate it to a multiple of the system page size. | *NOTE*: Requires `int getpagesize()` to be availble in your used `libc` implementation. (It ususally will exist unless you're using some meme implementation of `libc`.) This is enabled by default with the `memfile` mode. |
| `jemalloc` | Use `jemalloc` instead of system `malloc()` when allocating memory. This is only really helpful when *not* using `memfile`, but the program heap is still used for error propagating and log reporting in either mode. | `jemalloc` incorporates a lot of redundant (in this case) locking mechanisms, but causes a generally lower used memory profile than system malloc, however it does allocate far more *virtual memory* pages than is generally needed. This is enabled by default with the `buffered` mode. |
