Many hyperlinks are disabled.
Use anonymous login
to enable hyperlinks.
Overview
| Comment: | This hack illustrates how to use the VDBE_PROFILE mechanism to show which bytecode operators are using resources other than time. In this case, the number of loops through the binary search code in sqlite3BtreeMovetoUnpacked() is measured, for the purpose of helping to identify unnecessary btree searches. |
|---|---|
| Downloads: | Tarball | ZIP archive |
| Timelines: | family | ancestors | descendants | both | vdbe-aux-perf |
| Files: | files | file ages | folders |
| SHA1: |
746b1836834914627d97369690b9596d |
| User & Date: | drh 2017-01-07 00:42:57.449 |
Context
|
2017-01-09
| ||
| 20:57 | Merge latest changes from trunk, and also move the perf-counter into the inner loop of sqlite3BtreeMovetoUnpacked(). (Leaf check-in: ff9eab9587 user: drh tags: vdbe-aux-perf) | |
|
2017-01-07
| ||
| 00:42 | This hack illustrates how to use the VDBE_PROFILE mechanism to show which bytecode operators are using resources other than time. In this case, the number of loops through the binary search code in sqlite3BtreeMovetoUnpacked() is measured, for the purpose of helping to identify unnecessary btree searches. (check-in: 746b183683 user: drh tags: vdbe-aux-perf) | |
|
2017-01-06
| ||
| 13:49 | Ensure that "PRAGMA case_sensitive_like" and "PRAGMA shrink_memory" set the number of output columns to 0 (as they are statements that return no data). (check-in: 6696cd1878 user: dan tags: trunk) | |
Changes
Changes to src/btree.c.
| ︙ | ︙ | |||
5120 5121 5122 5123 5124 5125 5126 5127 5128 5129 5130 5131 5132 5133 |
assert( pCur->apPage[0]->intKey==pCur->curIntKey );
assert( pCur->curIntKey || pIdxKey );
for(;;){
int lwr, upr, idx, c;
Pgno chldPg;
MemPage *pPage = pCur->apPage[pCur->iPage];
u8 *pCell; /* Pointer to current cell in pPage */
/* pPage->nCell must be greater than zero. If this is the root-page
** the cursor would have been INVALID above and this for(;;) loop
** not run. If this is not the root-page, then the moveToChild() routine
** would have already detected db corruption. Similarly, pPage must
** be the right kind (index or table) of b-tree page. Otherwise
** a moveToChild() or moveToRoot() call would have detected corruption. */
| > | 5120 5121 5122 5123 5124 5125 5126 5127 5128 5129 5130 5131 5132 5133 5134 |
assert( pCur->apPage[0]->intKey==pCur->curIntKey );
assert( pCur->curIntKey || pIdxKey );
for(;;){
int lwr, upr, idx, c;
Pgno chldPg;
MemPage *pPage = pCur->apPage[pCur->iPage];
u8 *pCell; /* Pointer to current cell in pPage */
sqlite3PerfCnt++;
/* pPage->nCell must be greater than zero. If this is the root-page
** the cursor would have been INVALID above and this for(;;) loop
** not run. If this is not the root-page, then the moveToChild() routine
** would have already detected db corruption. Similarly, pPage must
** be the right kind (index or table) of b-tree page. Otherwise
** a moveToChild() or moveToRoot() call would have detected corruption. */
|
| ︙ | ︙ |
Changes to src/sqliteInt.h.
| ︙ | ︙ | |||
4316 4317 4318 4319 4320 4321 4322 4323 4324 | #endif int sqlite3ExprVectorSize(Expr *pExpr); int sqlite3ExprIsVector(Expr *pExpr); Expr *sqlite3VectorFieldSubexpr(Expr*, int); Expr *sqlite3ExprForVectorField(Parse*,Expr*,int); void sqlite3VectorErrorMsg(Parse*, Expr*); #endif /* SQLITEINT_H */ | > > | 4316 4317 4318 4319 4320 4321 4322 4323 4324 4325 4326 | #endif int sqlite3ExprVectorSize(Expr *pExpr); int sqlite3ExprIsVector(Expr *pExpr); Expr *sqlite3VectorFieldSubexpr(Expr*, int); Expr *sqlite3ExprForVectorField(Parse*,Expr*,int); void sqlite3VectorErrorMsg(Parse*, Expr*); sqlite3_uint64 sqlite3PerfCnt; #endif /* SQLITEINT_H */ |
Changes to src/vdbe.c.
| ︙ | ︙ | |||
502 503 504 505 506 507 508 | #ifdef VDBE_PROFILE /* ** hwtime.h contains inline assembler code for implementing ** high-performance timing routines. */ | | > | 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 | #ifdef VDBE_PROFILE /* ** hwtime.h contains inline assembler code for implementing ** high-performance timing routines. */ /*#include "hwtime.h"*/ #define sqlite3Hwtime(x) sqlite3PerfCnt #endif #ifndef NDEBUG /* ** This function is only called from within an assert() expression. It ** checks that the sqlite3.nTransaction variable is correctly set to |
| ︙ | ︙ |