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Resurrect -F switch: it controls fsyncs again, though the fsyncs are 

mostly just on the WAL logfile nowadays.  But if people want to disable
fsync for performance, why should we say no?
This commit is contained in:
Tom Lane 2000-12-08 22:21:33 +00:00
parent 57c499a463
commit fb47385fc8
3 changed files with 24 additions and 13 deletions
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18
src/backend/access/transam/xlog.c
View File

@ -6,7 +6,7 @@
* Portions Copyright (c) 1996-2000, PostgreSQL, Inc
* Portions Copyright (c) 1994, Regents of the University of California
*
* $Header: /cvsroot/pgsql/src/backend/access/transam/xlog.c,v 1.39 2000/12/03 10:27:26 vadim Exp $
* $Header: /cvsroot/pgsql/src/backend/access/transam/xlog.c,v 1.40 2000/12/08 22:21:33 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -621,7 +621,7 @@ XLogFlush(XLogRecPtr record)
logFile = XLogFileOpen(logId, logSeg, false);
}
if (fsync(logFile) != 0)
if (pg_fsync(logFile) != 0)
elog(STOP, "fsync(logfile %u seg %u) failed: %m",
logId, logSeg);
LgwrResult.Flush = LgwrResult.Write;
@ -717,7 +717,7 @@ XLogWrite(char *buffer)
{
if (wcnt > 0)
{
if (fsync(logFile) != 0)
if (pg_fsync(logFile) != 0)
elog(STOP, "fsync(logfile %u seg %u) failed: %m",
logId, logSeg);
if (LgwrResult.Write.xlogid != logId)
@ -799,7 +799,7 @@ XLogWrite(char *buffer)
if (XLByteLT(LgwrResult.Flush, LgwrRqst.Flush) &&
XLByteLE(LgwrRqst.Flush, LgwrResult.Write))
{
if (fsync(logFile) != 0)
if (pg_fsync(logFile) != 0)
elog(STOP, "fsync(logfile %u seg %u) failed: %m",
logId, logSeg);
LgwrResult.Flush = LgwrResult.Write;
@ -864,7 +864,7 @@ XLogFileInit(uint32 log, uint32 seg, bool *usexistent)
elog(STOP, "write(logfile %u seg %u) failed: %m",
logId, logSeg);
if (fsync(fd) != 0)
if (pg_fsync(fd) != 0)
elog(STOP, "fsync(logfile %u seg %u) failed: %m",
logId, logSeg);
@ -1213,7 +1213,7 @@ next_record_is_invalid:;
}
if (readFile >= 0)
{
if (fsync(readFile) < 0)
if (pg_fsync(readFile) < 0)
elog(STOP, "ReadRecord: fsync(logfile %u seg %u) failed: %m",
readId, readSeg);
close(readFile);
@ -1330,7 +1330,7 @@ WriteControlFile(void)
if (write(fd, buffer, BLCKSZ) != BLCKSZ)
elog(STOP, "WriteControlFile failed to write control file: %m");
if (fsync(fd) != 0)
if (pg_fsync(fd) != 0)
elog(STOP, "WriteControlFile failed to fsync control file: %m");
close(fd);
@ -1400,7 +1400,7 @@ UpdateControlFile(void)
if (write(fd, ControlFile, sizeof(ControlFileData)) != sizeof(ControlFileData))
elog(STOP, "write(cntlfile) failed: %m");
if (fsync(fd) != 0)
if (pg_fsync(fd) != 0)
elog(STOP, "fsync(cntlfile) failed: %m");
close(fd);
@ -1489,7 +1489,7 @@ BootStrapXLOG()
if (write(logFile, buffer, BLCKSZ) != BLCKSZ)
elog(STOP, "BootStrapXLOG failed to write logfile: %m");
if (fsync(logFile) != 0)
if (pg_fsync(logFile) != 0)
elog(STOP, "BootStrapXLOG failed to fsync logfile: %m");
close(logFile);

14
src/backend/storage/file/fd.c
View File

@ -7,7 +7,7 @@
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/storage/file/fd.c,v 1.68 2000/11/30 08:46:23 vadim Exp $
* $Header: /cvsroot/pgsql/src/backend/storage/file/fd.c,v 1.69 2000/12/08 22:21:32 tgl Exp $
*
* NOTES:
*
@ -192,6 +192,18 @@ static File fileNameOpenFile(FileName fileName, int fileFlags, int fileMode);
static char *filepath(char *filename);
static long pg_nofile(void);
/*
* pg_fsync --- same as fsync except does nothing if -F switch was given
*/
int
pg_fsync(int fd)
{
if (enableFsync)
return fsync(fd);
else
return 0;
}
/*
* BasicOpenFile --- same as open(2) except can free other FDs if needed
*

5
src/include/storage/fd.h
View File

@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2000, PostgreSQL, Inc
* Portions Copyright (c) 1994, Regents of the University of California
*
* $Id: fd.h,v 1.24 2000/11/30 08:46:26 vadim Exp $
* $Id: fd.h,v 1.25 2000/12/08 22:21:32 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -70,7 +70,6 @@ extern int BasicOpenFile(FileName fileName, int fileFlags, int fileMode);
/* Miscellaneous support routines */
extern void closeAllVfds(void);
extern void AtEOXact_Files(void);
#define pg_fsync(fd) fsync(fd)
extern int pg_fsync(int fd);
#endif /* FD_H */