AuroraMiddleware/zstd
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updated levels 15-20

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taking advantage of `btopt` improved speed to tune parameters.
Levels 16-19 are stronger than previous release, making the graph more favorable.

In theory, I should also update small-size tables,
but I got lazy on that one ...
This commit is contained in:
Yann Collet 2017-12-14 23:29:00 -08:00
parent 2cff66b62f
commit 3cbfac1cdb
1 changed files with 6 additions and 6 deletions
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12
lib/compress/zstd_compress.c
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@ -2955,12 +2955,12 @@ static const ZSTD_compressionParameters ZSTD_defaultCParameters[4][ZSTD_MAX_CLEV
{ 22, 20, 22, 5, 5, 16, ZSTD_lazy2 }, /* level 12 */
{ 22, 21, 22, 5, 5, 16, ZSTD_lazy2 }, /* level 13 */
{ 22, 21, 22, 6, 5, 16, ZSTD_lazy2 }, /* level 14 */
{ 22, 21, 22, 5, 5, 16, ZSTD_btlazy2 }, /* level 15 */
{ 23, 22, 22, 5, 5, 16, ZSTD_btlazy2 }, /* level 16 */
{ 23, 22, 22, 4, 5, 24, ZSTD_btopt }, /* level 17 */
{ 23, 22, 22, 5, 4, 32, ZSTD_btopt }, /* level 18 */
{ 23, 23, 22, 6, 3, 48, ZSTD_btopt }, /* level 19 */
{ 25, 25, 23, 7, 3, 64, ZSTD_btultra }, /* level 20 */
{ 22, 21, 22, 4, 5, 16, ZSTD_btlazy2 }, /* level 15 */
{ 22, 21, 22, 4, 5, 48, ZSTD_btopt }, /* level 16 */
{ 23, 22, 22, 4, 4, 48, ZSTD_btopt }, /* level 17 */
{ 23, 22, 22, 5, 3, 64, ZSTD_btopt }, /* level 18 */
{ 23, 23, 22, 7, 3,128, ZSTD_btopt }, /* level 19 */
{ 25, 25, 23, 7, 3,128, ZSTD_btultra }, /* level 20 */
{ 26, 26, 24, 7, 3,256, ZSTD_btultra }, /* level 21 */
{ 27, 27, 25, 9, 3,512, ZSTD_btultra }, /* level 22 */
},