Greg Spiegelberg <[EMAIL PROTECTED]> writes:
If the log and database were on the same disk I'd be okay with the current workaround. If the ``-'' gave me near the same performance as turning syslog off I'd be okay with that too. However, neither of these are the case so there has to be something else blocking between the two processes.
You could also consider not using syslog at all: let the postmaster output to its stderr, and pipe that into a log-rotation program. I believe some people use Apache's log rotator for this with good results.
I do this... here's the relevant lines from my startup script:
ROTATE="/inst/apache/bin/rotatelogs $PGLOGS/postgresql 86400" $PGBIN/pg_ctl start -s -D $PGDATA | $ROTATE &
Following is a patch to rotatelogs that does two things:
- makes a symbolic link 'foo.current' that points to the current output file.
- gzips the rotated logfile
If you have gnu tools installed, you can
tail --retry --follow=name foo.current
and it will automatically track the most recent
log file.HTH, Mark
-- Mark Harrison Pixar Animation Studios
*** rotatelogs.c-orig 2004-03-10 10:24:02.000000000 -0800 --- rotatelogs.c 2004-03-10 11:01:55.000000000 -0800 *************** *** 25,30 **** --- 25,32 ---- int main (int argc, char **argv) { char buf[BUFSIZE], buf2[MAX_PATH], errbuf[ERRMSGSZ]; + char linkbuf[MAX_PATH]; + char oldbuf2[MAX_PATH]; time_t tLogEnd = 0, tRotation; int nLogFD = -1, nLogFDprev = -1, nMessCount = 0, nRead, nWrite; int utc_offset = 0; *************** *** 75,80 **** --- 77,84 ---- setmode(0, O_BINARY); #endif
+ sprintf(linkbuf, "%s.current", szLogRoot);
+ sprintf(oldbuf2, "");
use_strftime = (strstr(szLogRoot, "%") != NULL);
for (;;) {
nRead = read(0, buf, sizeof buf);
***************
*** 99,104 ****
--- 103,111 ----
sprintf(buf2, "%s.%010d", szLogRoot, (int) tLogStart);
}
tLogEnd = tLogStart + tRotation;
+ printf("oldbuf2=%s\n",oldbuf2);
+ printf("buf2=%s\n",buf2);
+ printf("linkbuf=%s\n",linkbuf);
nLogFD = open(buf2, O_WRONLY | O_CREAT | O_APPEND, 0666);
if (nLogFD < 0) {
/* Uh-oh. Failed to open the new log file. Try to clear
***************
*** 125,130 ****
--- 132,146 ----
}
else {
close(nLogFDprev);
+ /* use: tail --follow=name foo.current */
+ unlink(linkbuf);
+ symlink(buf2,linkbuf);
+ if (strlen(oldbuf2) > 0) {
+ char cmd[MAX_PATH+100];
+ sprintf(cmd, "gzip %s &", oldbuf2);
+ system(cmd);
+ }
+ strcpy(oldbuf2, buf2);
}
nMessCount = 0;
}
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