ddidderr/zstd-rs
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level tuning

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This commit is contained in:
Yann Collet
2015-11-03 09:49:30 +01:00
parent 3564487614
commit 050efba81b
3 changed files with 79 additions and 68 deletions
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lib/zstdhc_static.h
+30 -29
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@@ -53,7 +53,7 @@ typedef struct
U32 hashLog; /* dispatch table : larger == more memory, faster*/
U32 searchLog; /* nb of searches : larger == more compression, slower*/
U32 searchLength; /* size of matches : larger == faster decompression */
ZSTD_HC_strategy strategy; /* greedy, lazy (stronger, slower) */
ZSTD_HC_strategy strategy; /* greedy, lazy, lazydeep */
} ZSTD_HC_parameters;
/* parameters boundaries */
@@ -73,7 +73,7 @@ typedef struct
* Advanced function
***************************************/
/** ZSTD_HC_compress_advanced
* Same as ZSTD_HC_compressCCtx(), but can fine-tune each compression parameter */
* Same as ZSTD_HC_compressCCtx(), with fine-tune control of each compression parameter */
size_t ZSTD_HC_compress_advanced (ZSTD_HC_CCtx* ctx,
void* dst, size_t maxDstSize,
const void* src, size_t srcSize,
@@ -94,35 +94,36 @@ size_t ZSTD_HC_compressEnd(ZSTD_HC_CCtx* ctx, void* dst, size_t maxDstSize);
#define ZSTD_HC_MAX_CLEVEL 26
static const ZSTD_HC_parameters ZSTD_HC_defaultParameters[ZSTD_HC_MAX_CLEVEL+1] = {
/* W, C, H, S, L, strat */
{ 18, 12, 14, 1, 4, ZSTD_HC_greedy }, /* level 0 - never used */
{ 18, 12, 14, 1, 4, ZSTD_HC_greedy }, /* level 1 - in fact redirected towards zstd fast */
{ 18, 12, 15, 2, 4, ZSTD_HC_greedy }, /* level 2 */
{ 19, 13, 17, 3, 5, ZSTD_HC_greedy }, /* level 3 */
{ 20, 18, 19, 2, 5, ZSTD_HC_greedy }, /* level 4 */
{ 20, 19, 19, 3, 5, ZSTD_HC_greedy }, /* level 5 */
{ 20, 18, 20, 3, 5, ZSTD_HC_lazy }, /* level 6 */
{ 20, 18, 20, 4, 5, ZSTD_HC_lazy }, /* level 7 */
{ 21, 19, 20, 4, 5, ZSTD_HC_lazy }, /* level 8 */
{ 21, 19, 20, 5, 5, ZSTD_HC_lazy }, /* level 9 */
{ 21, 20, 20, 5, 5, ZSTD_HC_lazy }, /* level 10 */
{ 21, 21, 20, 5, 5, ZSTD_HC_lazy }, /* level 11 */
{ 22, 20, 22, 6, 5, ZSTD_HC_lazy }, /* level 12 */
{ 22, 21, 22, 6, 5, ZSTD_HC_lazy }, /* level 13 */
{ 23, 21, 22, 6, 5, ZSTD_HC_lazy }, /* level 14 */
{ 23, 21, 23, 7, 5, ZSTD_HC_lazy }, /* level 15 */
{ 23, 22, 22, 6, 5, ZSTD_HC_lazy }, /* level 16 */
{ 23, 22, 22, 7, 5, ZSTD_HC_lazy }, /* level 17 */
{ 23, 23, 22, 7, 5, ZSTD_HC_lazy }, /* level 18 */
{ 23, 22, 23, 8, 5, ZSTD_HC_lazy }, /* level 19 */
{ 23, 23, 23, 8, 5, ZSTD_HC_lazy }, /* level 20 */
{ 23, 23, 23, 8, 5, ZSTD_HC_lazy }, /* level 21 */
{ 24, 24, 24, 8, 5, ZSTD_HC_lazy }, /* level 22 */
{ 24, 23, 23, 9, 5, ZSTD_HC_lazy }, /* level 23 */
{ 24, 24, 24, 9, 5, ZSTD_HC_lazy }, /* level 24 */
{ 24, 24, 24, 9, 5, ZSTD_HC_lazy }, /* level 25 */
{ 24, 24, 24, 10, 5, ZSTD_HC_lazy }, /* level 26 */ /* ZSTD_HC_MAX_CLEVEL */
{ 18, 12, 14, 1, 4, ZSTD_HC_greedy }, /* level 0 - never used */
{ 18, 12, 14, 1, 4, ZSTD_HC_greedy }, /* level 1 - in fact redirected towards zstd fast */
{ 18, 12, 15, 2, 4, ZSTD_HC_greedy }, /* level 2 */
{ 19, 13, 17, 3, 5, ZSTD_HC_greedy }, /* level 3 */
{ 20, 18, 19, 2, 5, ZSTD_HC_greedy }, /* level 4 */
{ 20, 18, 19, 2, 5, ZSTD_HC_lazy }, /* level 5 */
{ 20, 18, 20, 3, 5, ZSTD_HC_lazy }, /* level 6 */
{ 20, 18, 20, 4, 5, ZSTD_HC_lazy }, /* level 7 */
{ 21, 19, 20, 4, 5, ZSTD_HC_lazy }, /* level 8 */
{ 21, 19, 20, 5, 5, ZSTD_HC_lazy }, /* level 9 */
{ 21, 20, 20, 5, 5, ZSTD_HC_lazy }, /* level 10 */
{ 21, 20, 20, 5, 5, ZSTD_HC_lazydeep }, /* level 11 */
{ 22, 20, 22, 5, 5, ZSTD_HC_lazydeep }, /* level 12 */
{ 22, 20, 22, 6, 5, ZSTD_HC_lazydeep }, /* level 13 */
{ 21, 21, 22, 6, 5, ZSTD_HC_lazydeep }, /* level 14 */
{ 22, 21, 22, 6, 5, ZSTD_HC_lazydeep }, /* level 15 */
{ 22, 21, 23, 7, 5, ZSTD_HC_lazydeep }, /* level 16 */
{ 23, 21, 23, 7, 5, ZSTD_HC_lazydeep }, /* level 17 */
{ 23, 22, 23, 7, 5, ZSTD_HC_lazydeep }, /* level 18 */
{ 23, 22, 23, 7, 5, ZSTD_HC_lazydeep }, /* level 19 */
{ 23, 22, 23, 8, 5, ZSTD_HC_lazydeep }, /* level 20 */
{ 23, 22, 23, 8, 5, ZSTD_HC_lazydeep }, /* level 21 */
{ 23, 23, 24, 8, 5, ZSTD_HC_lazydeep }, /* level 22 */
{ 24, 24, 24, 8, 5, ZSTD_HC_lazydeep }, /* level 23 */
{ 23, 23, 23, 9, 5, ZSTD_HC_lazydeep }, /* level 24 */
{ 24, 23, 23, 9, 5, ZSTD_HC_lazydeep }, /* level 25 */
{ 24, 24, 24, 9, 5, ZSTD_HC_lazydeep }, /* level 26 */
};
#if defined (__cplusplus)
}
#endif