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Add a HIGHSTRESS parameter to the sqlite3_config_alt_pcache debugging

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command in the test harness - to force calling pagerStress() more
frequently. (CVS 6127)

FossilOrigin-Name: e426860b94f5b47e3a265549dbac64a421cae425
This commit is contained in:
drh
2009-01-07 03:59:47 +00:00
parent d6e5e09816
commit f2a84e3ca6
4 changed files with 42 additions and 20 deletions
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18
src/test_pcache.c
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@@ -21,7 +21,7 @@
** This pagecache implementation is designed for simplicity
** not speed.
**
** $Id: test_pcache.c,v 1.1 2008/11/19 01:20:26 drh Exp $
** $Id: test_pcache.c,v 1.2 2009/01/07 03:59:47 drh Exp $
*/
#include "sqlite3.h"
#include <string.h>
@@ -36,8 +36,9 @@ typedef struct testpcacheGlobalType testpcacheGlobalType;
struct testpcacheGlobalType {
void *pDummy; /* Dummy allocation to simulate failures */
int nInstance; /* Number of current instances */
unsigned discardChance; /* Chance of discarding on an unpin */
unsigned discardChance; /* Chance of discarding on an unpin (0-100) */
unsigned prngSeed; /* Seed for the PRNG */
unsigned highStress; /* Call xStress agressively */
};
static testpcacheGlobalType testpcacheGlobal;
@@ -210,6 +211,15 @@ static void *testpcacheFetch(
return 0;
}
/* Do not allocate if highStress is enabled and createFlag is not 2.
**
** The highStress setting causes pagerStress() to be called much more
** often, which exercises the pager logic more intensely.
*/
if( testpcacheGlobal.highStress && createFlag<2 ){
return 0;
}
/* Find a free page to allocate if there are any free pages.
** Withhold TESTPCACHE_RESERVE free pages until createFlag is 2.
*/
@@ -401,7 +411,8 @@ static void testpcacheDestroy(sqlite3_pcache *pCache){
void installTestPCache(
int installFlag, /* True to install. False to uninstall. */
unsigned discardChance, /* 0-100. Chance to discard on unpin */
unsigned prngSeed /* Seed for the PRNG */
unsigned prngSeed, /* Seed for the PRNG */
unsigned highStress /* Call xStress agressively */
){
static const sqlite3_pcache_methods testPcache = {
(void*)&testpcacheGlobal,
@@ -424,6 +435,7 @@ void installTestPCache(
assert( discardChance<=100 );
testpcacheGlobal.discardChance = discardChance;
testpcacheGlobal.prngSeed = prngSeed ^ (prngSeed<<16);
testpcacheGlobal.highStress = highStress;
if( installFlag!=isInstalled ){
if( installFlag ){
sqlite3_config(SQLITE_CONFIG_GETPCACHE, &defaultPcache);