zstd: Improve "best" compression #677
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``` benchstat -delta-test none old2.txt new2.txt name old time/op new time/op delta Encoder_EncodeAllXML-16 13.3ms ± 0% 13.0ms ± 0% -2.11% Encoder_EncodeAllSimple/fastest-16 229µs ± 0% 227µs ± 0% -1.08% Encoder_EncodeAllSimple/default-16 343µs ± 0% 371µs ± 0% +8.13% Encoder_EncodeAllSimple/better-16 402µs ± 0% 393µs ± 0% -2.33% Encoder_EncodeAllSimple/best-16 6.41ms ± 0% 2.72ms ± 0% -57.48% <==== Encoder_EncodeAllSimple4K/fastest-16 2.70µs ± 0% 2.56µs ± 0% -5.26% Encoder_EncodeAllSimple4K/default-16 33.1µs ± 0% 33.5µs ± 0% +1.30% Encoder_EncodeAllSimple4K/better-16 39.3µs ± 0% 38.8µs ± 0% -1.12% Encoder_EncodeAllSimple4K/best-16 732µs ± 0% 360µs ± 0% -50.90% <==== Encoder_EncodeAllHTML-16 213µs ± 0% 209µs ± 0% -2.07% Encoder_EncodeAllTwain-16 3.23ms ± 0% 3.23ms ± 0% -0.04% Encoder_EncodeAllPi-16 1.12ms ± 0% 1.11ms ± 0% -1.01% Random4KEncodeAllFastest-16 988ns ± 0% 976ns ± 0% -1.31% Random10MBEncodeAllFastest-16 2.50ms ± 0% 2.48ms ± 0% -0.70% Random4KEncodeAllDefault-16 4.58µs ± 0% 4.56µs ± 0% -0.31% RandomEncodeAllDefault-16 2.58ms ± 0% 2.52ms ± 0% -2.20% Random10MBEncoderFastest-16 3.61ms ± 0% 3.61ms ± 0% -0.04% RandomEncoderDefault-16 3.44ms ± 0% 3.44ms ± 0% +0.03% name old speed new speed delta Encoder_EncodeAllXML-16 402MB/s ± 0% 410MB/s ± 0% +2.16% Encoder_EncodeAllSimple/fastest-16 173MB/s ± 0% 175MB/s ± 0% +1.10% Encoder_EncodeAllSimple/default-16 116MB/s ± 0% 107MB/s ± 0% -7.52% Encoder_EncodeAllSimple/better-16 99.0MB/s ± 0% 101.4MB/s ± 0% +2.38% Encoder_EncodeAllSimple/best-16 6.21MB/s ± 0% 14.61MB/s ± 0% +135.27% <==== Encoder_EncodeAllSimple4K/fastest-16 1.52GB/s ± 0% 1.60GB/s ± 0% +5.56% Encoder_EncodeAllSimple4K/default-16 124MB/s ± 0% 122MB/s ± 0% -1.29% Encoder_EncodeAllSimple4K/better-16 104MB/s ± 0% 106MB/s ± 0% +1.13% Encoder_EncodeAllSimple4K/best-16 5.59MB/s ± 0% 11.39MB/s ± 0% +103.76% <==== Encoder_EncodeAllHTML-16 208MB/s ± 0% 213MB/s ± 0% +2.11% Encoder_EncodeAllTwain-16 120MB/s ± 0% 120MB/s ± 0% +0.04% Encoder_EncodeAllPi-16 89.0MB/s ± 0% 89.9MB/s ± 0% +1.02% Random4KEncodeAllFastest-16 4.14GB/s ± 0% 4.20GB/s ± 0% +1.32% Random10MBEncodeAllFastest-16 4.19GB/s ± 0% 4.22GB/s ± 0% +0.71% Random4KEncodeAllDefault-16 895MB/s ± 0% 897MB/s ± 0% +0.31% RandomEncodeAllDefault-16 4.06GB/s ± 0% 4.15GB/s ± 0% +2.25% Random10MBEncoderFastest-16 2.90GB/s ± 0% 2.90GB/s ± 0% +0.04% RandomEncoderDefault-16 3.05GB/s ± 0% 3.05GB/s ± 0% -0.03% ```
nightwolfz
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nightwolfz
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Very nice! Could you add a comment explaining how you determined the size? That way if the struct is changed whoever is looking at it will know how to adjust it. |
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@klauspost All done :) |
klauspost
approved these changes
Sep 25, 2022
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For information, I have also tried aligning other structs one by one but nothing else had any measurable effect.