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If compiled with the -DVDBE_PROFILE=1 option, special code is inserted that

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uses the pentium RDTSC instruction to compute very precise runtimes on all
VDBE opcodes.  (This only works on i586 processors, of course.)  The results
are written into the vdbe_profile.out file for analysis. Hopefully, this
new feature will reveal hot spots that can be optimized to make the VDBE run
faster. (CVS 807)

FossilOrigin-Name: a1c071ea18766932c90275c704e078134c67be68
This commit is contained in:
drh
2003-01-01 23:06:20 +00:00
parent c64e0ba45c
commit 7b39686749
4 changed files with 79 additions and 15 deletions
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6
src/vdbe.h
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@@ -15,7 +15,7 @@
** or VDBE. The VDBE implements an abstract machine that runs a
** simple program to access and modify the underlying database.
**
** $Id: vdbe.h,v 1.60 2002/09/08 00:04:53 drh Exp $
** $Id: vdbe.h,v 1.61 2003/01/01 23:06:21 drh Exp $
*/
#ifndef _SQLITE_VDBE_H_
#define _SQLITE_VDBE_H_
@@ -39,6 +39,10 @@ struct VdbeOp {
int p2; /* Second parameter (often the jump destination) */
char *p3; /* Third parameter */
int p3type; /* P3_STATIC, P3_DYNAMIC or P3_POINTER */
#ifdef VDBE_PROFILE
int cnt; /* Number of times this instruction was executed */
long long cycles; /* Total time spend executing this instruction */
#endif
};
typedef struct VdbeOp VdbeOp;