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Change the page cache so that a new sqlite3_pcache object is allocated as

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soon as the page cache is opened, not delayed until the first fetch request.
This give a noticable performance boost.  The interface between pager and
the page cache has changed slightly, which might break ZIPVFS.

FossilOrigin-Name: f1f94a971e031e784f8c30a6faf829df58709329
This commit is contained in:
drh
2014-08-26 15:06:49 +00:00
parent 05bbb2e824
commit c3031c61ef
5 changed files with 67 additions and 78 deletions
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25
src/pager.c
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@@ -3622,7 +3622,7 @@ int sqlite3PagerSetPagesize(Pager *pPager, u32 *pPageSize, int nReserve){
pPager->pageSize = pageSize;
sqlite3PageFree(pPager->pTmpSpace);
pPager->pTmpSpace = pNew;
sqlite3PcacheSetPageSize(pPager->pPCache, pageSize);
rc = sqlite3PcacheSetPageSize(pPager->pPCache, pageSize);
}
}
@@ -4385,7 +4385,7 @@ static int pagerStress(void *p, PgHdr *pPg){
**
** Spilling is also prohibited when in an error state since that could
** lead to database corruption. In the current implementaton it
** is impossible for sqlite3PcacheFetch() to be called with createFlag==1
** is impossible for sqlite3PcacheFetch() to be called with createFlag==3
** while in the error state, hence it is impossible for this routine to
** be called in the error state. Nevertheless, we include a NEVER()
** test for the error state as a safeguard against future changes.
@@ -4721,22 +4721,23 @@ act_like_temp_file:
testcase( rc!=SQLITE_OK );
}
/* If an error occurred in either of the blocks above, free the
** Pager structure and close the file.
/* Initialize the PCache object. */
if( rc==SQLITE_OK ){
assert( nExtra<1000 );
nExtra = ROUND8(nExtra);
rc = sqlite3PcacheOpen(szPageDflt, nExtra, !memDb,
!memDb?pagerStress:0, (void *)pPager, pPager->pPCache);
}
/* If an error occurred above, free the Pager structure and close the file.
*/
if( rc!=SQLITE_OK ){
assert( !pPager->pTmpSpace );
sqlite3OsClose(pPager->fd);
sqlite3PageFree(pPager->pTmpSpace);
sqlite3_free(pPager);
return rc;
}
/* Initialize the PCache object. */
assert( nExtra<1000 );
nExtra = ROUND8(nExtra);
sqlite3PcacheOpen(szPageDflt, nExtra, !memDb,
!memDb?pagerStress:0, (void *)pPager, pPager->pPCache);
PAGERTRACE(("OPEN %d %s\n", FILEHANDLEID(pPager->fd), pPager->zFilename));
IOTRACE(("OPEN %p %s\n", pPager, pPager->zFilename))
@@ -5318,7 +5319,7 @@ int sqlite3PagerAcquire(
}
}
rc = sqlite3PcacheFetch(pPager->pPCache, pgno, 1, ppPage);
rc = sqlite3PcacheFetch(pPager->pPCache, pgno, 3, ppPage);
}
if( rc!=SQLITE_OK ){