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Enhance separate pcache1 to allocate a block of pages from heap on startup,

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if possible, for a 5.2% performance improvement.

FossilOrigin-Name: aa7341c8736732a0a59f6688cc34e78be02a7bfc
This commit is contained in:
drh
2015-07-06 18:54:52 +00:00
parent b63ce02f57
commit ee70a84ea7
5 changed files with 126 additions and 57 deletions
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12
test/speedtest1.c
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@ -1177,6 +1177,7 @@ int main(int argc, char **argv){
int noSync = 0; /* True for --nosync */
int pageSize = 0; /* Desired page size. 0 means default */
int nPCache = 0, szPCache = 0;/* --pcache configuration */
int doPCache = 0; /* True if --pcache is seen */
int nScratch = 0, szScratch=0;/* --scratch configuration */
int showStats = 0; /* True for --stats */
int nThread = 0; /* --threads value */
@ -1251,6 +1252,7 @@ int main(int argc, char **argv){
if( i>=argc-2 ) fatal_error("missing arguments on %s\n", argv[i]);
nPCache = integerValue(argv[i+1]);
szPCache = integerValue(argv[i+2]);
doPCache = 1;
i += 2;
}else if( strcmp(z,"primarykey")==0 ){
g.zPK = "PRIMARY KEY";
@ -1317,10 +1319,12 @@ int main(int argc, char **argv){
rc = sqlite3_config(SQLITE_CONFIG_HEAP, pHeap, nHeap, mnHeap);
if( rc ) fatal_error("heap configuration failed: %d\n", rc);
}
if( nPCache>0 && szPCache>0 ){
pPCache = malloc( nPCache*(sqlite3_int64)szPCache );
if( pPCache==0 ) fatal_error("cannot allocate %lld-byte pcache\n",
nPCache*(sqlite3_int64)szPCache);
if( doPCache ){
if( nPCache>0 && szPCache>0 ){
pPCache = malloc( nPCache*(sqlite3_int64)szPCache );
if( pPCache==0 ) fatal_error("cannot allocate %lld-byte pcache\n",
nPCache*(sqlite3_int64)szPCache);
}
rc = sqlite3_config(SQLITE_CONFIG_PAGECACHE, pPCache, szPCache, nPCache);
if( rc ) fatal_error("pcache configuration failed: %d\n", rc);
}