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Add and integrate lazy row hash strategy

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This commit is contained in:
Nick Terrell
2021-04-07 09:53:34 -07:00
committed by Sen Huang
parent f71aabb5b5
commit 4694423c4f
16 changed files with 1256 additions and 183 deletions
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tests/fuzz/.gitignore
+1
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@@ -19,6 +19,7 @@ sequence_compression_api
fuzz-*.log
rt_lib_*
d_lib_*
crash-*
# misc
trace
tests/fuzz/zstd_helpers.c
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@@ -91,6 +91,7 @@ void FUZZ_setRandomParameters(ZSTD_CCtx *cctx, size_t srcSize, FUZZ_dataProducer
/* Set misc parameters */
setRand(cctx, ZSTD_c_nbWorkers, 0, 2, producer);
setRand(cctx, ZSTD_c_rsyncable, 0, 1, producer);
setRand(cctx, ZSTD_c_useRowMatchFinder, 0, 2, producer);
setRand(cctx, ZSTD_c_forceMaxWindow, 0, 1, producer);
setRand(cctx, ZSTD_c_literalCompressionMode, 0, 2, producer);
setRand(cctx, ZSTD_c_forceAttachDict, 0, 2, producer);
tests/fuzzer.c
+18 -1
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@@ -1757,13 +1757,14 @@ static int basicUnitTests(U32 const seed, double compressibility)
size_t const contentSize = 9 KB;
const void* const dict = (const char*)CNBuffer;
const void* const contentStart = (const char*)dict + flatdictSize;
/* These upper bounds are generally within a few bytes of the compressed size */
size_t const target_nodict_cSize[22+1] = { 3840, 3770, 3870, 3830, 3770,
3770, 3770, 3770, 3750, 3750,
3742, 3670, 3670, 3660, 3660,
3660, 3660, 3660, 3660, 3660,
3660, 3660, 3660 };
size_t const target_wdict_cSize[22+1] = { 2830, 2890, 2890, 2820, 2940,
2950, 2950, 2921, 2900, 2891,
2950, 2950, 2925, 2900, 2891,
2910, 2910, 2910, 2770, 2760,
2750, 2750, 2750, 2750, 2750,
2750, 2750, 2750 };
@@ -1800,6 +1801,22 @@ static int basicUnitTests(U32 const seed, double compressibility)
DISPLAYLEVEL(4, "level %i with dictionary : max expected %u >= reached %u \n",
l, (unsigned)target_wdict_cSize[l], (unsigned)wdict_cSize);
}
/* Dict compression with DMS */
for ( l=1 ; l <= maxLevel; l++) {
size_t wdict_cSize;
CHECK_Z( ZSTD_CCtx_loadDictionary(ctxOrig, dict, flatdictSize) );
CHECK_Z( ZSTD_CCtx_setParameter(ctxOrig, ZSTD_c_compressionLevel, l) );
CHECK_Z( ZSTD_CCtx_setParameter(ctxOrig, ZSTD_c_enableDedicatedDictSearch, 0) );
CHECK_Z( ZSTD_CCtx_setParameter(ctxOrig, ZSTD_c_forceAttachDict, ZSTD_dictForceAttach) );
wdict_cSize = ZSTD_compress2(ctxOrig, compressedBuffer, compressedBufferSize, contentStart, contentSize);
if (wdict_cSize > target_wdict_cSize[l]) {
DISPLAYLEVEL(1, "error : compression with dictionary and compress2 at level %i worse than expected (%u > %u) \n",
l, (unsigned)wdict_cSize, (unsigned)target_wdict_cSize[l]);
goto _output_error;
}
DISPLAYLEVEL(4, "level %i with dictionary and compress2 : max expected %u >= reached %u \n",
l, (unsigned)target_wdict_cSize[l], (unsigned)wdict_cSize);
}
DISPLAYLEVEL(4, "compression efficiency tests OK \n");
}