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dictBuilder manages better samples of null size 0 and large size > 128 KB

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This commit is contained in:
Yann Collet 2016-07-06 15:41:03 +02:00
parent 445d49d898
commit bcb5f77efa
1 changed files with 29 additions and 31 deletions
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60
programs/dibio.c
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@ -43,13 +43,10 @@
#define MB *(1 <<20)
#define GB *(1U<<30)
#define DICTLISTSIZE 10000
#define MEMMULT 11
static const size_t maxMemory = (sizeof(size_t) == 4) ? (2 GB - 64 MB) : ((size_t)(512 MB) << sizeof(size_t));
#define NOISELENGTH 32
#define PRIME1 2654435761U
#define PRIME2 2246822519U
/*-*************************************
@ -60,17 +57,13 @@ static const size_t maxMemory = (sizeof(size_t) == 4) ? (2 GB - 64 MB) : ((size_
static unsigned g_displayLevel = 0; /* 0 : no display; 1: errors; 2: default; 4: full information */
#define DISPLAYUPDATE(l, ...) if (g_displayLevel>=l) { \
if ((DIB_GetMilliSpan(g_time) > refreshRate) || (g_displayLevel>=4)) \
if ((DIB_clockSpan(g_time) > refreshRate) || (g_displayLevel>=4)) \
{ g_time = clock(); DISPLAY(__VA_ARGS__); \
if (g_displayLevel>=4) fflush(stdout); } }
static const unsigned refreshRate = 150;
static const clock_t refreshRate = CLOCKS_PER_SEC * 2 / 10;
static clock_t g_time = 0;
static unsigned DIB_GetMilliSpan(clock_t nPrevious)
{
clock_t const nCurrent = clock();
return (unsigned)(((nCurrent - nPrevious) * 1000) / CLOCKS_PER_SEC);
}
static clock_t DIB_clockSpan(clock_t nPrevious) { return clock() - nPrevious; }
/*-*************************************
@ -97,13 +90,15 @@ unsigned DiB_isError(size_t errorCode) { return ERR_isError(errorCode); }
const char* DiB_getErrorName(size_t errorCode) { return ERR_getErrorName(errorCode); }
#define MIN(a,b) ( (a) < (b) ? (a) : (b) )
/* ********************************************************
* File related operations
**********************************************************/
/** DiB_loadFiles() :
* @return : nb of files effectively loaded into `buffer` */
static unsigned DiB_loadFiles(void* buffer, size_t bufferSize,
static unsigned DiB_loadFiles(void* buffer, size_t* bufferSizePtr,
size_t* fileSizes,
const char** fileNamesTable, unsigned nbFiles)
{
@ -112,18 +107,20 @@ static unsigned DiB_loadFiles(void* buffer, size_t bufferSize,
unsigned n;
for (n=0; n<nbFiles; n++) {
unsigned long long const fs64 = UTIL_getFileSize(fileNamesTable[n]);
size_t const fileSize = (size_t)(fs64 > bufferSize-pos ? 0 : fs64);
FILE* const f = fopen(fileNamesTable[n], "rb");
if (f==NULL) EXM_THROW(10, "impossible to open file %s", fileNamesTable[n]);
DISPLAYUPDATE(2, "Loading %s... \r", fileNamesTable[n]);
{ size_t const readSize = fread(buff+pos, 1, fileSize, f);
if (readSize != fileSize) EXM_THROW(11, "could not read %s", fileNamesTable[n]);
pos += readSize; }
fileSizes[n] = fileSize;
fclose(f);
if (fileSize == 0) break; /* stop there, not enough memory to load all files */
}
const char* const fileName = fileNamesTable[n];
unsigned long long const fs64 = UTIL_getFileSize(fileName);
size_t const fileSize = (size_t) MIN(fs64, 128 KB);
if (fileSize > *bufferSizePtr-pos) break;
{ FILE* const f = fopen(fileName, "rb");
if (f==NULL) EXM_THROW(10, "zstd: dictBuilder: %s %s ", fileName, strerror(errno));
DISPLAYUPDATE(2, "Loading %s... \r", fileName);
{ size_t const readSize = fread(buff+pos, 1, fileSize, f);
if (readSize != fileSize) EXM_THROW(11, "Pb reading %s", fileName);
pos += readSize; }
fileSizes[n] = fileSize;
fclose(f);
} }
*bufferSizePtr = pos;
return n;
}
@ -137,26 +134,28 @@ static size_t DiB_findMaxMem(unsigned long long requiredMem)
void* testmem = NULL;
requiredMem = (((requiredMem >> 23) + 1) << 23);
requiredMem += 2 * step;
requiredMem += step;
if (requiredMem > maxMemory) requiredMem = maxMemory;
while (!testmem) {
requiredMem -= step;
testmem = malloc((size_t)requiredMem);
requiredMem -= step;
}
free(testmem);
return (size_t)(requiredMem - step);
return (size_t)requiredMem;
}
static void DiB_fillNoise(void* buffer, size_t length)
{
unsigned acc = PRIME1;
unsigned const prime1 = 2654435761U;
unsigned const prime2 = 2246822519U;
unsigned acc = prime1;
size_t p=0;;
for (p=0; p<length; p++) {
acc *= PRIME2;
acc *= prime2;
((unsigned char*)buffer)[p] = (unsigned char)(acc >> 21);
}
}
@ -188,7 +187,6 @@ size_t ZDICT_trainFromBuffer_unsafe(void* dictBuffer, size_t dictBufferCapacity,
ZDICT_params_t parameters);
#define MIN(a,b) ((a)<(b)?(a):(b))
int DiB_trainFromFiles(const char* dictFileName, unsigned maxDictSize,
const char** fileNamesTable, unsigned nbFiles,
ZDICT_params_t params)
@ -197,7 +195,7 @@ int DiB_trainFromFiles(const char* dictFileName, unsigned maxDictSize,
size_t* const fileSizes = (size_t*)malloc(nbFiles * sizeof(size_t));
unsigned long long const totalSizeToLoad = UTIL_getTotalFileSize(fileNamesTable, nbFiles);
size_t const maxMem = DiB_findMaxMem(totalSizeToLoad * MEMMULT) / MEMMULT;
size_t const benchedSize = MIN (maxMem, (size_t)totalSizeToLoad);
size_t benchedSize = MIN (maxMem, (size_t)totalSizeToLoad);
void* const srcBuffer = malloc(benchedSize+NOISELENGTH);
int result = 0;
@ -210,7 +208,7 @@ int DiB_trainFromFiles(const char* dictFileName, unsigned maxDictSize,
DISPLAYLEVEL(1, "Not enough memory; training on %u MB only...\n", (unsigned)(benchedSize >> 20));
/* Load input buffer */
nbFiles = DiB_loadFiles(srcBuffer, benchedSize, fileSizes, fileNamesTable, nbFiles);
nbFiles = DiB_loadFiles(srcBuffer, &benchedSize, fileSizes, fileNamesTable, nbFiles);
DiB_fillNoise((char*)srcBuffer + benchedSize, NOISELENGTH); /* guard band, for end of buffer condition */
{ size_t const dictSize = ZDICT_trainFromBuffer_unsafe(dictBuffer, maxDictSize,