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Change to the pager to avoid opening journal files unnecessarily. This can

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sometimes results in a significant speed improvement. (CVS 791)

FossilOrigin-Name: fa5c042585c601449ede7319d0c5993cd8ba75a4
This commit is contained in:
drh
2002-12-02 04:25:19 +00:00
parent d0d006e29c
commit da47d7748f
11 changed files with 146 additions and 87 deletions
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14
src/os.c
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@@ -39,7 +39,7 @@
/*
** Macros for performance tracing. Normally turned off
*/
#if 1
#if 0
static int last_page = 0;
#define SEEK(X) last_page=(X)
#define TRACE1(X) fprintf(stderr,X)
@@ -261,6 +261,7 @@ int sqliteOsOpenReadWrite(
return SQLITE_NOMEM;
}
id->locked = 0;
TRACE3("OPEN %-3d %s\n", id->fd, zFilename);
return SQLITE_OK;
#endif
#if OS_WIN
@@ -330,6 +331,7 @@ int sqliteOsOpenExclusive(const char *zFilename, OsFile *id, int delFlag){
if( delFlag ){
unlink(zFilename);
}
TRACE3("OPEN-EX %-3d %s\n", id->fd, zFilename);
return SQLITE_OK;
#endif
#if OS_WIN
@@ -379,6 +381,7 @@ int sqliteOsOpenReadOnly(const char *zFilename, OsFile *id){
return SQLITE_NOMEM;
}
id->locked = 0;
TRACE3("OPEN-RO %-3d %s\n", id->fd, zFilename);
return SQLITE_OK;
#endif
#if OS_WIN
@@ -468,6 +471,7 @@ int sqliteOsClose(OsFile *id){
sqliteOsEnterMutex();
releaseLockInfo(id->pLock);
sqliteOsLeaveMutex();
TRACE2("CLOSE %-3d\n", id->fd);
return SQLITE_OK;
#endif
#if OS_WIN
@@ -485,7 +489,7 @@ int sqliteOsRead(OsFile *id, void *pBuf, int amt){
#if OS_UNIX
int got;
SimulateIOError(SQLITE_IOERR);
TRACE2("READ %d\n", last_page);
TRACE3("READ %-3d %d\n", id->fd, last_page);
got = read(id->fd, pBuf, amt);
/* if( got<0 ) got = 0; */
if( got==amt ){
@@ -517,7 +521,7 @@ int sqliteOsWrite(OsFile *id, const void *pBuf, int amt){
#if OS_UNIX
int wrote = 0;
SimulateIOError(SQLITE_IOERR);
TRACE2("WRITE %d\n", last_page);
TRACE3("WRITE %-3d %d\n", id->fd, last_page);
while( amt>0 && (wrote = write(id->fd, pBuf, amt))>0 ){
amt -= wrote;
pBuf = &((char*)pBuf)[wrote];
@@ -558,7 +562,7 @@ int sqliteOsSeek(OsFile *id, off_t offset){
LONG lowerBits = offset & 0xffffffff;
DWORD rc;
rc = SetFilePointer(id->h, lowerBits, &upperBits, FILE_BEGIN);
TRACE3("SEEK rc=0x%x upper=0x%x\n", rc, upperBits);
/* TRACE3("SEEK rc=0x%x upper=0x%x\n", rc, upperBits); */
}
return SQLITE_OK;
#endif
@@ -569,7 +573,7 @@ int sqliteOsSeek(OsFile *id, off_t offset){
*/
int sqliteOsSync(OsFile *id){
SimulateIOError(SQLITE_IOERR);
TRACE1("SYNC\n");
TRACE2("SYNC %-3d\n", id->fd);
#if OS_UNIX
if( fsync(id->fd) ){
return SQLITE_IOERR;