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Overview
| Comment: | Performance optimization in accessPayload(). |
|---|---|
| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA1: |
ebb1fd98d4e448aa6d8f1e5be7ddc5be |
| User & Date: | drh 2017-01-27 01:13:49 |
Context
|
2017-01-27
| ||
| 01:25 | Another micro-optimization in accessPayload(). Slightly smaller and faster. check-in: c012619b user: drh tags: trunk | |
| 01:13 | Performance optimization in accessPayload(). check-in: ebb1fd98 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: 68e7a8c6 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;
}
/* 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 );
|
| < > |
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}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 );
|