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Overview
| Comment: | Add a bypass path in sqlite3PagerWrite() for pages with the PGHDR_WRITEABLE bit set, for about a 1% performance increase. |
|---|---|
| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA1: | ba425a6abb9886e6af87b5f6205202db |
| User & Date: | drh 2015-06-29 20:53:18 |
Context
|
2015-06-29
| ||
| 23:01 | From sqlite3BtreeInsert(), bypass the btreeMoveto() routine for table inserts and go directly to sqlite3BtreeMovetoUnpacked(). check-in: 53fe685d user: drh tags: trunk | |
| 20:53 | Add a bypass path in sqlite3PagerWrite() for pages with the PGHDR_WRITEABLE bit set, for about a 1% performance increase. check-in: ba425a6a user: drh tags: trunk | |
| 19:08 | Combine subjRequiresPage() and subjournalPage() into a single subjournalPageIfRequired() routine. check-in: 3b65eb56 user: drh tags: trunk | |
Changes
Changes to src/pager.c.
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rc = read32bits(jfd, (*pOffset)-4, &cksum);
if( rc ) return rc;
if( !isSavepnt && pager_cksum(pPager, (u8*)aData)!=cksum ){
return SQLITE_DONE;
}
}
/* If this page has already been played by before during the current
** rollback, then don't bother to play it back again.
*/
if( pDone && (rc = sqlite3BitvecSet(pDone, pgno))!=SQLITE_OK ){
return rc;
}
/* When playing back page 1, restore the nReserve setting
................................................................................
** as appropriate. Otherwise, SQLITE_OK.
*/
int sqlite3PagerWrite(PgHdr *pPg){
assert( (pPg->flags & PGHDR_MMAP)==0 );
assert( pPg->pPager->eState>=PAGER_WRITER_LOCKED );
assert( pPg->pPager->eState!=PAGER_ERROR );
assert( assert_pager_state(pPg->pPager) );
if( pPg->pPager->sectorSize > (u32)pPg->pPager->pageSize ){
return pagerWriteLargeSector(pPg);
}else{
return pager_write(pPg);
}
}
/*
................................................................................
*/
void sqlite3PagerDontWrite(PgHdr *pPg){
Pager *pPager = pPg->pPager;
if( (pPg->flags&PGHDR_DIRTY) && pPager->nSavepoint==0 ){
PAGERTRACE(("DONT_WRITE page %d of %d\n", pPg->pgno, PAGERID(pPager)));
IOTRACE(("CLEAN %p %d\n", pPager, pPg->pgno))
pPg->flags |= PGHDR_DONT_WRITE;
pager_set_pagehash(pPg);
}
}
/*
** This routine is called to increment the value of the database file
** change-counter, stored as a 4-byte big-endian integer starting at
|
| > > > > | > |
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rc = read32bits(jfd, (*pOffset)-4, &cksum);
if( rc ) return rc;
if( !isSavepnt && pager_cksum(pPager, (u8*)aData)!=cksum ){
return SQLITE_DONE;
}
}
/* If this page has already been played back before during the current
** rollback, then don't bother to play it back again.
*/
if( pDone && (rc = sqlite3BitvecSet(pDone, pgno))!=SQLITE_OK ){
return rc;
}
/* When playing back page 1, restore the nReserve setting
................................................................................
** as appropriate. Otherwise, SQLITE_OK.
*/
int sqlite3PagerWrite(PgHdr *pPg){
assert( (pPg->flags & PGHDR_MMAP)==0 );
assert( pPg->pPager->eState>=PAGER_WRITER_LOCKED );
assert( pPg->pPager->eState!=PAGER_ERROR );
assert( assert_pager_state(pPg->pPager) );
Pager *pPager = pPg->pPager;
if( (pPg->flags & PGHDR_WRITEABLE)!=0 && pPager->dbSize>=pPg->pgno ){
if( pPager->nSavepoint ) return subjournalPageIfRequired(pPg);
return SQLITE_OK;
}else if( pPager->sectorSize > (u32)pPager->pageSize ){
return pagerWriteLargeSector(pPg);
}else{
return pager_write(pPg);
}
}
/*
................................................................................
*/
void sqlite3PagerDontWrite(PgHdr *pPg){
Pager *pPager = pPg->pPager;
if( (pPg->flags&PGHDR_DIRTY) && pPager->nSavepoint==0 ){
PAGERTRACE(("DONT_WRITE page %d of %d\n", pPg->pgno, PAGERID(pPager)));
IOTRACE(("CLEAN %p %d\n", pPager, pPg->pgno))
pPg->flags |= PGHDR_DONT_WRITE;
pPg->flags &= ~PGHDR_WRITEABLE;
pager_set_pagehash(pPg);
}
}
/*
** This routine is called to increment the value of the database file
** change-counter, stored as a 4-byte big-endian integer starting at
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