Optimized the 'naive' linear hash table, and moved to sourceforge. :)
This commit is contained in:
Sears Russell
parent
a078f25475
commit
04cfc7da8e
8 changed files with 144 additions and 86 deletions
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@ -2,7 +2,7 @@ EXTRA_DIST = reconf
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SUBDIRS = src test utilities
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AM_CFLAGS = -g -Wall -pedantic
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docs: coverage
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docs:
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doxygen doc/Doxyfile-api
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doxygen doc/Doxyfile-developers
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@ -10,8 +10,8 @@
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/**
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Usage:
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unsigned long crc = -1L
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unsigned int crc = -1L
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crc = crc32(buffer, length, crc)
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*/
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unsigned long crc32(void *buffer, unsigned int count, unsigned long crc);
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unsigned int crc32(void *buffer, unsigned int count, unsigned int crc);
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@ -22,5 +22,8 @@ void ThashDelete(int xid, recordid hashRid,
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void * key, int keySize);
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void ThashUpdate(int xid, recordid hashRid, void * key, int keySize, void * val, int valSize);
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int ThashLookup(int xid, recordid hashRid, void * key, int keySize, void * buf, int valSize);
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void ThashInit();
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void ThashDeinit();
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int ThashOpen(int xid, recordid hashRid);
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int ThashClose(int xid, recordid hashRid) ;
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#endif
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@ -9,21 +9,21 @@
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// unsigned long crc = -1L
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// crc = crc32(buffer, length, crc)
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unsigned long crc32(void *buffer, unsigned int count, unsigned long crc);
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unsigned int crc32(void *buffer, unsigned int count, unsigned int crc);
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static int BuildCRCTable(void);
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static unsigned long *CRCTable; // Table constructed for fast lookup.
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#define CRC32_POLYNOMIAL 0xEDB88320L
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#define CRC32_POLYNOMIAL 0xEDB88320
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// Initialize the CRC calculation table
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//
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static int BuildCRCTable(void)
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{
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int i, j;
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unsigned long crc;
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unsigned int crc;
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CRCTable = malloc(256 * sizeof(unsigned long));
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CRCTable = malloc(256 * sizeof(unsigned int));
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if (CRCTable == NULL)
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{
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fprintf(stderr, "Can't malloc space for CRC table in file %s\n", __FILE__);
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@ -42,10 +42,10 @@ static int BuildCRCTable(void)
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}
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return 0;
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}
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unsigned long crc32(void *buffer, unsigned int count, unsigned long crc)
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/* changed long to int. - rusty. */
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unsigned int crc32(void *buffer, unsigned int count, unsigned int crc)
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{
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unsigned long temp1, temp2;
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unsigned int temp1, temp2;
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static int firsttime = 1;
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unsigned char *p = (unsigned char *)buffer;
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@ -58,7 +58,7 @@ unsigned long crc32(void *buffer, unsigned int count, unsigned long crc)
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while (count-- != 0)
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{
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temp1 = (crc >> 8) & 0x00FFFFFFL;
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temp1 = (crc >> 8) & 0x00FFFFFF;
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temp2 = CRCTable[((int)crc ^ *p++) & 0xFF];
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crc = temp1 ^ temp2;
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}
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@ -1,28 +1,22 @@
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#include <lladd/hash.h>
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#include <math.h>
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/*#include <math.h> */
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/*static int thomasWangs32BitMixFunction(int key);
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static unsigned long thomasWangs64BitMixFunction(unsigned long key);*/
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/** @todo replace powl in hash with something more efficient, if hash() becomes a bottleneck. */
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#define twoToThe(x) (1 << (x))
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unsigned int hash(void * val, long val_length, unsigned char tableBits, unsigned long nextExtension) {
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unsigned long tableLength = powl(2, tableBits);
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unsigned long oldTableLength = powl(2, tableBits - 1);
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unsigned long unmixed = crc32(val, val_length, (unsigned long)-1L);
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unsigned long ret = unmixed & (oldTableLength - 1);
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if(*(int*)val == 4090) {
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printf("here too!");
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}
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unsigned int oldTableLength = /*powl(2, tableBits - 1); */ twoToThe(tableBits - 1);
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unsigned int unmixed = crc32(val, val_length, (unsigned long)-1L);
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unsigned int ret = unmixed & (oldTableLength - 1);
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/* What would the low hash value be? */
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/* printf("hash(%d, bits=%d, ext=%ld) first: %ld ", *(int*)val, tableBits, nextExtension, ret); */
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if(ret < nextExtension) { /* Might be too low. */
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unsigned int tableLength = /* powl(2, tableBits); */ twoToThe(tableBits);
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ret = unmixed & (tableLength - 1);
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/* printf("second: %ld", ret); */
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}
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/* printf("\n"); */
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return (int) ret;
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}
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@ -14,23 +14,27 @@
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#define headerKeySize (headerRidA.page)
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#define headerValSize (headerRidA.slot)
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#define headerHashBits (headerRidB.page)
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#define headerNextSplit (headerRidB.slot)
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#define headerHashBits (headerRidB->page)
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#define headerNextSplit (headerRidB->slot)
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#include <math.h>
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#include <malloc.h>
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#include <string.h>
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#include <lladd/operations/linearHash.h>
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#include <pbl/pbl.h>
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typedef struct {
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recordid next;
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} hashEntry;
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void rehash(int xid, recordid hash, int next_split, int i);
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pblHashTable_t * openHashes = NULL;
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void rehash(int xid, recordid hash, int next_split, int i, int keySize, int valSize);
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void update_hash_header(int xid, recordid hash, int i, int next_split);
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int deleteFromBucket(int xid, recordid hash, int bucket_number, void * key, int keySize, recordid * deletedEntry);
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void insertIntoBucket(int xid, recordid hashRid, int bucket_number, hashEntry * e, int keySize, int valSize, recordid deletedEntry);
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int deleteFromBucket(int xid, recordid hash, int bucket_number, recordid bucket_rid, void * key, int keySize, recordid * deletedEntry);
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void insertIntoBucket(int xid, recordid hashRid, int bucket_number, recordid bucket_rid, hashEntry * e, int keySize, int valSize, recordid deletedEntry, int skipDelete);
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int findInBucket(int xid, recordid hashRid, int bucket_number, const void * key, int keySize, void * val, int valSize);
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@ -45,10 +49,13 @@ int findInBucket(int xid, recordid hashRid, int bucket_number, const void * key,
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Tread(xid, bucket, &nextEntry);
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if(nextEntry.size) {
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assert(nextEntry.size == sizeof(hashEntry) + keySize + valSize);
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}
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/* if(nextEntry.size) {
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e = malloc(nextEntry.size);
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} else {
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e = malloc(1);
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}
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} */
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int found = 0;
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while(nextEntry.size > 0) {
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Tread(xid, nextEntry, e);
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@ -59,10 +66,11 @@ int findInBucket(int xid, recordid hashRid, int bucket_number, const void * key,
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}
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nextEntry = e->next;
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}
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free(e);
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return found;
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}
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void expand (int xid, recordid hash, int next_split, int i) {
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void expand (int xid, recordid hash, int next_split, int i, int keySize, int valSize) {
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TarrayListExtend(xid, hash, 1);
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if(next_split >= powl(2,i-1)+2) {
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/* printf("\n\n%d %d (i++)\n\n", next_split, i); */
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@ -71,34 +79,33 @@ void expand (int xid, recordid hash, int next_split, int i) {
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}
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/* printf("-%d-", next_split); */
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/* printf("rehash(%d, %d + 2)\n", i, next_split - 2); */
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rehash(xid, hash, next_split, i);
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rehash(xid, hash, next_split, i, keySize, valSize);
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next_split++;
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update_hash_header(xid, hash, i, next_split);
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}
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void update_hash_header(int xid, recordid hash, int i, int next_split) {
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recordid headerRidB;
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recordid * headerRidB = pblHtLookup(openHashes, &hash.page, sizeof(int));
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hash.slot = 1;
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Tread(xid, hash, &headerRidB);
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/* hash.slot = 1; */
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/* Tread(xid, hash, headerRidB); */
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/* headerHashBits and headerHashSplit are #defined to refer to headerRidB. */
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headerHashBits = i;
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headerNextSplit = next_split;
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Tset(xid, hash, &headerRidB);
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Tset(xid, hash, headerRidB);
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}
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void rehash(int xid, recordid hashRid, int next_split, int i) {
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void rehash(int xid, recordid hashRid, int next_split, int i, int keySize, int valSize) {
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recordid bucket = hashRid;
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bucket.slot = next_split;
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recordid headerRidA;
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Tread(xid, hashRid, &headerRidA);
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/*recordid headerRidA;
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Tread(xid, hashRid, &headerRidA); */
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/* recordid oldRid;
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oldRid.page = 0;
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oldRid.slot = 0;
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oldRid.size = 0; */
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hashEntry * e = calloc(1,sizeof(hashEntry) + headerValSize + headerKeySize);
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assert(bucket.size < 1000);
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hashEntry * e = calloc(1,sizeof(hashEntry) + keySize + valSize /* headerValSize + headerKeySize */);
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if(bucket.size) {
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Tread(xid, bucket, &bucket);
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@ -109,64 +116,70 @@ void rehash(int xid, recordid hashRid, int next_split, int i) {
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/* printf("#%d", *(int*)(e+1)); */
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int old_hash = hash(e+1, headerKeySize, i-1, ULONG_MAX) + 2;
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int old_hash = hash(e+1, keySize, i-1, ULONG_MAX) + 2;
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assert(next_split == old_hash);
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int new_hash = hash(e+1, headerKeySize, i, ULONG_MAX) + 2;
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int new_hash = hash(e+1, keySize, i, ULONG_MAX) + 2;
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bucket = e->next;
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/* oldRid = bucket; */
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assert((!bucket.size )|| bucket.size == sizeof(hashEntry) + headerValSize + headerKeySize);
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assert((!bucket.size )|| bucket.size == sizeof(hashEntry) + keySize + valSize /*headerValSize + headerKeySize */);
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if(new_hash != next_split) {
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assert(new_hash == next_split + powl(2, i-1));
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/* recordid newRid = hashRid;
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newRid.slot = new_hash;
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recordid ptr;
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Tread(xid, newRid, &ptr); */
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/* printf("Moving from %d to %d.\n", next_split, new_hash);
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fflush(NULL); */
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recordid oldEntry;
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/* printf("!"); */
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/** @todo could be optimized. Why deleteFromBucket, then
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insertIntoBucket? Causes us to travers the bucket list an
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extra time... */
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assert(deleteFromBucket(xid, hashRid, next_split, e+1, headerKeySize, &oldEntry));
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insertIntoBucket(xid, hashRid, new_hash, e, headerKeySize, headerValSize, oldEntry);
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recordid next_split_contents, new_hash_contents;
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recordid tmp = hashRid;
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tmp.slot = next_split;
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Tread(xid, tmp, &next_split_contents);
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tmp.slot = new_hash;
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Tread(xid, tmp, &new_hash_contents);
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assert(deleteFromBucket(xid, hashRid, next_split, next_split_contents, e+1, keySize,/* valSize, headerKeySize,*/ &oldEntry));
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insertIntoBucket(xid, hashRid, new_hash, new_hash_contents, e, keySize, valSize, /*headerKeySize, headerValSize, */oldEntry, 1);
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} else {
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/* printf("-"); */
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/* printf("Not moving %d.\n", next_split);
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fflush(NULL); */
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}
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}
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free(e);
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}
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void insertIntoBucket(int xid, recordid hashRid, int bucket_number, hashEntry * e, int keySize, int valSize, recordid newEntry) {
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void insertIntoBucket(int xid, recordid hashRid, int bucket_number, recordid bucket_contents, hashEntry * e, int keySize, int valSize, recordid newEntry, int skipDelete) {
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recordid deleteMe;
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if(deleteFromBucket(xid, hashRid, bucket_number, e+1, keySize, &deleteMe)) {
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Tdealloc(xid, deleteMe);
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if(!skipDelete) {
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if(deleteFromBucket(xid, hashRid, bucket_number, bucket_contents, e+1, keySize, &deleteMe)) {
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Tdealloc(xid, deleteMe);
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hashRid.slot = bucket_number;
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Tread(xid, hashRid, &bucket_contents);
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hashRid.slot = 0;
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}
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}
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/*@todo consider recovery for insertIntoBucket. */
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/* recordid newEntry = Talloc(xid, sizeof(hashEntry) + keySize + valSize); */
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recordid bucket = hashRid;
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bucket.slot = bucket_number;
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Tread(xid, bucket, &(e->next));
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/* Tread(xid, bucket, &(e->next)); */
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e->next = bucket_contents;
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Tset(xid, newEntry, e);
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Tset(xid, bucket, &newEntry);
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}
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int deleteFromBucket(int xid, recordid hash, int bucket_number, void * key, int keySize, recordid * deletedEntry) {
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int deleteFromBucket(int xid, recordid hash, int bucket_number, recordid bucket_contents, void * key, int keySize, recordid * deletedEntry) {
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hashEntry * e;
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recordid bucket = hash;
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bucket.slot = bucket_number;
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recordid nextEntry;
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Tread(xid, bucket, &nextEntry);
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nextEntry = bucket_contents;
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/* Tread(xid, bucket, &nextEntry); */
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if(nextEntry.size) {
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e = calloc(1,nextEntry.size);
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} else {
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@ -205,7 +218,8 @@ recordid ThashAlloc(int xid, int keySize, int valSize) {
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recordid rid = TarrayListAlloc(xid, 16 + 2, 2, sizeof(recordid));
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TarrayListExtend(xid, rid, 32+2);
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recordid headerRidA, headerRidB;
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recordid headerRidA;
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recordid * headerRidB = malloc (sizeof(recordid));
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headerKeySize = keySize;
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headerValSize = valSize;
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@ -216,23 +230,36 @@ recordid ThashAlloc(int xid, int keySize, int valSize) {
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rid.slot =0;
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Tset(xid, rid, &headerRidA);
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rid.slot =1;
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Tset(xid, rid, &headerRidB);
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Tset(xid, rid, headerRidB);
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pblHtInsert(openHashes, &rid.page, sizeof(int), headerRidB);
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rid.slot =0;
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return rid;
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}
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void ThashInit() {
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openHashes = pblHtCreate();
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}
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void ThashDeinit() {
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pblHtDelete(openHashes);
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}
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void ThashInsert(int xid, recordid hashRid,
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void * key, int keySize,
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void * val, int valSize) {
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recordid headerRidA, headerRidB;
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recordid tmp = hashRid;
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tmp.slot = 0;
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/* recordid headerRidA; */
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recordid * headerRidB = pblHtLookup(openHashes, &hashRid.page, sizeof(int));
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/* recordid tmp = hashRid; */
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/* tmp.slot = 0;
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Tread(xid, tmp, &headerRidA);
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assert(headerKeySize == keySize);
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tmp.slot = 1;
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Tread(xid, tmp, &headerRidB);
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assert(headerValSize == valSize);
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tmp.slot = 1; */
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/* Tread(xid, tmp, &headerRidB); */
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/* assert(headerValSize == valSize); */
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int bucket = hash(key, keySize, headerHashBits, headerNextSplit - 2) + 2;
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@ -242,8 +269,12 @@ void ThashInsert(int xid, recordid hashRid,
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recordid newEntry = Talloc(xid, sizeof(hashEntry) + keySize + valSize);
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/* printf("%d -> %d\n", *(int*)(e+1), bucket); */
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insertIntoBucket(xid, hashRid, bucket, e, keySize, valSize, newEntry);
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expand(xid, hashRid, headerNextSplit, headerHashBits);
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recordid bucket_contents;
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hashRid.slot = bucket;
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Tread(xid, hashRid, &bucket_contents);
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hashRid.slot = 0;
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insertIntoBucket(xid, hashRid, bucket, bucket_contents, e, keySize, valSize, newEntry, 0);
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expand(xid, hashRid, headerNextSplit, headerHashBits, keySize, valSize);
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free(e);
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@ -252,28 +283,50 @@ void ThashInsert(int xid, recordid hashRid,
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so that expand can be selectively called. */
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void ThashDelete(int xid, recordid hashRid,
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void * key, int keySize) {
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recordid headerRidB;
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recordid * headerRidB = pblHtLookup(openHashes, &hashRid.page, sizeof(int));
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recordid tmp = hashRid;
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tmp.slot = 1;
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Tread(xid, tmp, &headerRidB);
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/* Tread(xid, tmp, headerRidB); */
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int bucket_number = hash(key, keySize, headerHashBits, headerNextSplit - 2) + 2;
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recordid deleteMe;
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if(deleteFromBucket(xid, hashRid, bucket_number, key, keySize, &deleteMe)) {
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hashRid.slot = bucket_number;
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recordid bucket_contents;
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Tread(xid, hashRid, &bucket_contents);
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hashRid.slot = 0;
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if(deleteFromBucket(xid, hashRid, bucket_number, bucket_contents, key, keySize, &deleteMe)) {
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Tdealloc(xid, deleteMe);
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}
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}
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int ThashOpen(int xid, recordid hashRid) {
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recordid * headerRidB = malloc(sizeof(recordid));
|
||||
hashRid.slot = 1;
|
||||
Tread(xid, hashRid, headerRidB);
|
||||
|
||||
pblHtInsert(openHashes, &hashRid.page, sizeof(int), headerRidB);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
void ThashUpdate(int xid, recordid hashRid, void * key, int keySize, void * val, int valSize) {
|
||||
ThashDelete(xid, hashRid, key, keySize);
|
||||
ThashInsert(xid, hashRid, key, keySize, val, valSize);
|
||||
|
||||
}
|
||||
|
||||
|
||||
int ThashClose(int xid, recordid hashRid) {
|
||||
recordid * freeMe = pblHtLookup(openHashes, &hashRid.page, sizeof(int));
|
||||
pblHtRemove(openHashes, &hashRid.page, sizeof(int));
|
||||
free(freeMe);
|
||||
return 0;
|
||||
}
|
||||
|
||||
int ThashLookup(int xid, recordid hashRid, void * key, int keySize, void * buf, int valSize) {
|
||||
recordid headerRidB;
|
||||
/* recordid headerRidB; */
|
||||
recordid * headerRidB = pblHtLookup(openHashes, &hashRid.page, sizeof(int));
|
||||
recordid tmp = hashRid;
|
||||
tmp.slot = 1;
|
||||
Tread(xid, tmp, &headerRidB);
|
||||
int bucket_number = hash(key, keySize, headerHashBits, headerNextSplit - 2) + 2;
|
||||
/* printf("look in %d\n", bucket_number); */
|
||||
int ret = findInBucket(xid, hashRid, bucket_number, key, keySize, buf, valSize);
|
||||
|
|
|
|||
|
|
@ -74,6 +74,7 @@ int Tinit() {
|
|||
openLogWriter();
|
||||
|
||||
pageOperationsInit();
|
||||
ThashInit();
|
||||
|
||||
InitiateRecovery();
|
||||
|
||||
|
|
@ -225,7 +226,7 @@ int Tdeinit() {
|
|||
}
|
||||
}
|
||||
assert( numActiveXactions == 0 );
|
||||
|
||||
ThashDeinit();
|
||||
bufDeinit();
|
||||
closeLogWriter();
|
||||
|
||||
|
|
|
|||
|
|
@ -24,6 +24,9 @@
|
|||
please see: http://mission.base.com/.
|
||||
|
||||
$Log$
|
||||
Revision 1.3 2004/10/17 02:17:00 sears
|
||||
Optimized the 'naive' linear hash table, and moved to sourceforge. :)
|
||||
|
||||
Revision 1.2 2004/07/20 00:15:17 sears
|
||||
pageCache.c is now re-entrant.
|
||||
|
||||
|
|
@ -117,7 +120,7 @@ typedef struct pbl_hashtable_s pbl_hashtable_t;
|
|||
/* functions */
|
||||
/*****************************************************************************/
|
||||
|
||||
static int hash( const unsigned char * key, size_t keylen )
|
||||
/*static int hash( const unsigned char * key, size_t keylen )
|
||||
{
|
||||
int ret = 104729;
|
||||
|
||||
|
|
@ -131,6 +134,10 @@ static int hash( const unsigned char * key, size_t keylen )
|
|||
}
|
||||
|
||||
return( ret % PBL_HASHTABLE_SIZE );
|
||||
}*/
|
||||
#include <lladd/crc32.h>
|
||||
static unsigned int hash( const unsigned char * key, size_t keylen ) {
|
||||
return ((unsigned int)(crc32((char*)key, keylen, -1))) % PBL_HASHTABLE_SIZE;
|
||||
}
|
||||
|
||||
/**
|
||||
|
|
|
|||
Loading…
Reference in a new issue