Introduce salt into row hash (#3528 part 2)#3533
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yoniko merged 15 commits intofacebook:devfrom Mar 13, 2023
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- Adds memory type that is guaranteed to have been initialized at least once in the workspace's lifetime. - Changes tag space in row hash to be based on init once memory. - Moves buffers to aligned memory and removes the buffer memory type.
…o allocate them after aligned buffers
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PR performance seems to be on PR with previous versions' performance for the samples I've tested. |
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@Cyan4973 - I've added some more entropy to the salt, let me know what you think |
This helps to avoid regressions where consecutive compressions use the same tag space with similar data (running `zstd -b5e7 enwik8 -B128K` reproduces this regression).
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- Adds memory type that is guaranteed to have been initialized at least once in the workspace's lifetime. - Changes tag space in row hash to be based on init once memory. - Moves buffers to aligned memory and removes the buffer memory type.
…o allocate them after aligned buffers
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@Cyan4973 - is there any other change you'll like to see here? |
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Part 2 of #3528
Adds hash salt that helps to avoid regressions where consecutive compressions use the same tag space with similar data (running
zstd -b5e7 enwik8 -B128Kreproduces this regression).Note: based on #3528 and includes it, see only diffs introduced here by selecting only the changes from last commit, or by viewing yoniko#13