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Avril 4 years ago
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@ -41,7 +41,8 @@ Whereas V2 uses a single `mmap()`.
## Memory usage ## Memory usage
The [memusage](https://www.systutorials.com/docs/linux/man/1-memusage/) graph for `v1` shows extremely inefficient stack usage. The [memusage](https://www.systutorials.com/docs/linux/man/1-memusage/) graph for `v1` shows extremely inefficient stack usage.
![](./profiling/old-mem.png) ![](./profiling/old-mem.png)
( the green is supposed to be a line, not a bar ) ( the green is supposed to be a line, not a bar! )
This is due to how the unshuffler buffers RNG results. 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. `v1` naively used VLAs to store this buffer, which can baloon to 8 times the size of the file being unshuffled.

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