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Overview
| Comment: | Increase the default minimum PMA size for multi-threaded sorting from 10x the page size to 250x the page size. Provide the SQLITE_SORTER_PMASZ compile-time option to change this default. |
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| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA1: |
b05340fe3cd5f1676a55023228dc8d1a |
| User & Date: | drh 2014-12-09 14:42:49 |
Context
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2014-12-09
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| 15:12 | Add the SQLITE_REVERSE_UNORDERED_SELECTS compile-time option that causes the "PRAGMA reverse_unordered_selects" setting to be on by default. (check-in: 75a803e6 user: drh tags: trunk) | |
| 15:01 | Increase the default PMA size from 10 to 250 pages and provide the SQLITE_SORTER_PMASZ compile-time option to change this default. Add needed mutex call when clearing the KeyInfo cache in shared-cache mode. (check-in: 6e2da589 user: drh tags: apple-osx) | |
| 14:54 | Merge the KeyInfo cache mutex fix from trunk. (check-in: f0940c73 user: drh tags: sessions) | |
| 14:42 | Increase the default minimum PMA size for multi-threaded sorting from 10x the page size to 250x the page size. Provide the SQLITE_SORTER_PMASZ compile-time option to change this default. (check-in: b05340fe user: drh tags: trunk) | |
| 04:26 | Fix harmless compiler warning. (check-in: e97b7a8b user: mistachkin tags: trunk) | |
Changes
Changes to src/vdbesort.c.
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**
** void *SRVAL(SorterRecord *p) { return (void*)&p[1]; }
*/
#define SRVAL(p) ((void*)((SorterRecord*)(p) + 1))
/* The minimum PMA size is set to this value multiplied by the database
** page size in bytes. */
#define SORTER_MIN_WORKING 10
/* Maximum number of PMAs that a single MergeEngine can merge */
#define SORTER_MAX_MERGE_COUNT 16
static int vdbeIncrSwap(IncrMerger*);
static void vdbeIncrFree(IncrMerger *);
................................................................................
pSorter->db = db;
for(i=0; i<pSorter->nTask; i++){
SortSubtask *pTask = &pSorter->aTask[i];
pTask->pSorter = pSorter;
}
if( !sqlite3TempInMemory(db) ){
pSorter->mnPmaSize = SORTER_MIN_WORKING * pgsz;
mxCache = db->aDb[0].pSchema->cache_size;
if( mxCache<SORTER_MIN_WORKING ) mxCache = SORTER_MIN_WORKING;
pSorter->mxPmaSize = MIN((i64)mxCache*pgsz, SQLITE_MAX_MXPMASIZE);
/* EVIDENCE-OF: R-26747-61719 When the application provides any amount of
** scratch memory using SQLITE_CONFIG_SCRATCH, SQLite avoids unnecessary
** large heap allocations.
*/
if( sqlite3GlobalConfig.pScratch==0 ){
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**
** void *SRVAL(SorterRecord *p) { return (void*)&p[1]; }
*/
#define SRVAL(p) ((void*)((SorterRecord*)(p) + 1))
/* The minimum PMA size is set to this value multiplied by the database
** page size in bytes. */
#ifndef SQLITE_SORTER_PMASZ
# define SQLITE_SORTER_PMASZ 250
#endif
/* Maximum number of PMAs that a single MergeEngine can merge */
#define SORTER_MAX_MERGE_COUNT 16
static int vdbeIncrSwap(IncrMerger*);
static void vdbeIncrFree(IncrMerger *);
................................................................................
pSorter->db = db;
for(i=0; i<pSorter->nTask; i++){
SortSubtask *pTask = &pSorter->aTask[i];
pTask->pSorter = pSorter;
}
if( !sqlite3TempInMemory(db) ){
pSorter->mnPmaSize = SQLITE_SORTER_PMASZ * pgsz;
mxCache = db->aDb[0].pSchema->cache_size;
if( mxCache<SQLITE_SORTER_PMASZ ) mxCache = SQLITE_SORTER_PMASZ;
pSorter->mxPmaSize = MIN((i64)mxCache*pgsz, SQLITE_MAX_MXPMASIZE);
/* EVIDENCE-OF: R-26747-61719 When the application provides any amount of
** scratch memory using SQLITE_CONFIG_SCRATCH, SQLite avoids unnecessary
** large heap allocations.
*/
if( sqlite3GlobalConfig.pScratch==0 ){
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