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Overview
| Comment: | Performance optimization in accessPayload(). |
|---|---|
| Downloads: | Tarball | ZIP archive |
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA1: |
ebb1fd98d4e448aa6d8f1e5be7ddc5be |
| User & Date: | drh 2017-01-27 01:13:49.702 |
Context
|
2017-01-27
| ||
| 01:25 | Another micro-optimization in accessPayload(). Slightly smaller and faster. (check-in: c012619b65 user: drh tags: trunk) | |
| 01:13 | Performance optimization in accessPayload(). (check-in: ebb1fd98d4 user: drh tags: trunk) | |
| 00:31 | Simplify the accessPayload() routine so that it always populates the overflow page cache. In the one case where populating the page cache can lead to problems, simply invalidate the cache as soon as accessPayload() returns. This simplification reduces code size and helps accessPayload() to run a little faster. This backs out the eOp==2 mode of accessPayload() added by check-in [da59198505]. (check-in: 68e7a8c676 user: drh tags: trunk) | |
Changes
Changes to src/btree.c.
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}else{
pCur->nOvflAlloc = nOvfl*2;
pCur->aOverflow = aNew;
}
}
memset(pCur->aOverflow, 0, nOvfl*sizeof(Pgno));
pCur->curFlags |= BTCF_ValidOvfl;
| | < > | 4521 4522 4523 4524 4525 4526 4527 4528 4529 4530 4531 4532 4533 4534 4535 4536 4537 4538 4539 4540 4541 4542 4543 4544 4545 |
}else{
pCur->nOvflAlloc = nOvfl*2;
pCur->aOverflow = aNew;
}
}
memset(pCur->aOverflow, 0, nOvfl*sizeof(Pgno));
pCur->curFlags |= BTCF_ValidOvfl;
}else{
/* If the overflow page-list cache has been allocated and the
** entry for the first required overflow page is valid, skip
** directly to it.
*/
if( pCur->aOverflow[offset/ovflSize] ){
iIdx = (offset/ovflSize);
nextPage = pCur->aOverflow[iIdx];
offset = (offset%ovflSize);
}
}
assert( rc==SQLITE_OK && amt>0 );
while( nextPage ){
/* If required, populate the overflow page-list cache. */
assert( pCur->aOverflow[iIdx]==0
|| pCur->aOverflow[iIdx]==nextPage
|| CORRUPT_DB );
|
| ︙ | ︙ |