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Overview
| Comment: | In the VDBE loop, only check for OOM errors at jumps rather than after every opcode, for about a 0.5% performance increase. |
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| Downloads: | Tarball | ZIP archive |
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA1: |
632071bac5ff324a74cec9bdbba2deb6 |
| User & Date: | drh 2016-02-03 22:14:38.812 |
References
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2016-02-04
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| 19:50 | Temporarily back out the 0.5% performance improvement from check-in [632071bac5ff32]. Need a more elaborate solution that works with reentrant virtual tables and SQL functions. (check-in: 42736fb0ad user: drh tags: trunk) | |
Context
|
2016-02-04
| ||
| 19:50 | Temporarily back out the 0.5% performance improvement from check-in [632071bac5ff32]. Need a more elaborate solution that works with reentrant virtual tables and SQL functions. (check-in: 42736fb0ad user: drh tags: trunk) | |
| 09:48 | Refinements to synchronous logic: (1) Use PAGER_SYNCHRONOUS_FULL rather than the corresponding magic number. (2) Honor SQLITE_NO_SYNC on xDelete calls with sync (3) Count xDelete syncs during testing (4) Fix #ifs on SQLITE_EXTRA_DURABLE so that directory syncs on journal unlink are off by default. (check-in: e3157cb5ad user: drh tags: trunk) | |
| 02:34 | Add and use the sqlite3VdbeZeroRegister() interface for coding the common operation of writing zero into a register. (Leaf check-in: 1c8d300189 user: drh tags: zero-register) | |
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2016-02-03
| ||
| 22:14 | In the VDBE loop, only check for OOM errors at jumps rather than after every opcode, for about a 0.5% performance increase. (check-in: 632071bac5 user: drh tags: trunk) | |
| 20:04 | Improve performance of fts5 prefix queries on detail=col tables. (check-in: ca11f46db0 user: dan tags: trunk) | |
Changes
Changes to src/vdbe.c.
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}
if( p->db->flags & SQLITE_VdbeTrace ) printf("VDBE Trace:\n");
}
sqlite3EndBenignMalloc();
#endif
for(pOp=&aOp[p->pc]; rc==SQLITE_OK; pOp++){
assert( pOp>=aOp && pOp<&aOp[p->nOp]);
| < | 625 626 627 628 629 630 631 632 633 634 635 636 637 638 |
}
if( p->db->flags & SQLITE_VdbeTrace ) printf("VDBE Trace:\n");
}
sqlite3EndBenignMalloc();
#endif
for(pOp=&aOp[p->pc]; rc==SQLITE_OK; pOp++){
assert( pOp>=aOp && pOp<&aOp[p->nOp]);
#ifdef VDBE_PROFILE
start = sqlite3Hwtime();
#endif
nVmStep++;
#ifdef SQLITE_ENABLE_STMT_SCANSTATUS
if( p->anExec ) p->anExec[(int)(pOp-aOp)]++;
#endif
|
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case OP_Goto: { /* jump */
jump_to_p2_and_check_for_interrupt:
pOp = &aOp[pOp->p2 - 1];
/* Opcodes that are used as the bottom of a loop (OP_Next, OP_Prev,
** OP_VNext, OP_RowSetNext, or OP_SorterNext) all jump here upon
** completion. Check to see if sqlite3_interrupt() has been called
| | > | > | 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 |
case OP_Goto: { /* jump */
jump_to_p2_and_check_for_interrupt:
pOp = &aOp[pOp->p2 - 1];
/* Opcodes that are used as the bottom of a loop (OP_Next, OP_Prev,
** OP_VNext, OP_RowSetNext, or OP_SorterNext) all jump here upon
** completion. Check to see if sqlite3_interrupt() has been called
** or if the progress callback needs to be invoked. Also check for
** OOM conditions and abort if seen.
**
** This code uses unstructured "goto" statements and does not look clean.
** But that is not due to sloppy coding habits. The code is written this
** way for performance, to avoid having to run the interrupt and progress
** checks on every opcode. This helps sqlite3_step() to run over 2.0%
** faster according to "valgrind --tool=cachegrind" */
check_for_interrupt:
if( db->mallocFailed ) goto no_mem;
if( db->u1.isInterrupted ) goto abort_due_to_interrupt;
#ifndef SQLITE_OMIT_PROGRESS_CALLBACK
/* Call the progress callback if it is configured and the required number
** of VDBE ops have been executed (either since this invocation of
** sqlite3VdbeExec() or since last time the progress callback was called).
** If the progress callback returns non-zero, exit the virtual machine with
** a return code SQLITE_ABORT.
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