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<DIV><FONT face=Arial size=2>Hi,</FONT></DIV>
<DIV><FONT face=Arial size=2> Try to monitor your server
performance via top while cron is running with <FONT face="Times New Roman"
size=3>run_stats.sh script</FONT>.</FONT></DIV>
<DIV><FONT face=Arial size=2>It will give you an idea about what is being done?
Does this process takes a lot of CPU or spawns other processes that consumes a
lot of CPU of memory</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>I got such behavior with Apache+PHP (running as
CGI)+MySQL on CentOS 3.5 and i found that MySQL was taking about 90% CPU before
the server dies with nothing could be done except cold booting.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>If you have a similar problem, Let us determine
which process exactly is doing this biss-behaviour and try to find
alternatives.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Hameed</FONT></DIV>
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style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=mu.llamas@gmail.com href="mailto:mu.llamas@gmail.com">Ian mu</A>
</DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=centos@centos.org
href="mailto:centos@centos.org">centos@centos.org</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Monday, October 03, 2005 11:30
AM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> [CentOS] Cron script crashing
server...</DIV>
<DIV><BR></DIV>
<DIV>Hiya, have a bit of an odd problem so looking for thoughts before
proceeding any more.</DIV>
<DIV> </DIV>
<DIV>Problem is on centos3 (also runs fine on another but fails on another, so
not sure this is an issue or not), dual xeon setup.</DIV>
<DIV> </DIV>
<DIV>Basically I have a perl script that runs once, first thing every morning,
gathering some stats (currently turned off due to problem). Crontab -l shows
the following...</DIV>
<DIV> </DIV>
<DIV>00 6 * * * nice /home/statsman/stats/run_stats.sh
>/dev/null 2>&1 (.sh file basically sources with full path a config
with some vars, then runs the perl script).</DIV>
<DIV> </DIV>
<DIV>There are a couple of other scripts in the crontab which run absolutely
fine, so cron itself seems to be working, its just the combination.</DIV>
<DIV> </DIV>
<DIV>If I run this (at that time or anytime) via cron, the whole server
totally dies no warning, nothing in logs instantly. If I watch in top waiting
for the cron you don't even see it appear, machine just totally hangs, can't
ping or anything, needs a cold boot. Nothing in logs or anything apart from
bootup info after. </DIV>
<DIV> </DIV>
<DIV>If I run the perl script outside of cron from any folder
at all, it works fine, never crashes which is where I'm confused, its only as
soon as its run from cron. To test I've put it on a test machine, and to
confuse it further runs absolutely fine under cron (old redhat install
though) no matter what I do, it also seems to run fine on other machines
(except one with identical problem) and runs fine from cron on other linux
dists/machines, but can't do as much testing on them. </DIV>
<DIV> </DIV>
<DIV>I'm really not sure where the problem lies, so may be offtopic, I'm just
confused why it runs on some and not others (although maybe running the same
version, its possible they were configured slightly different on install), and
pretty much clutching at straws. Worse thing is machines a production one, and
want to keep downtime to a minimum, so trying to get some angle on what may be
wrong before testing more. </DIV>
<DIV> </DIV>
<DIV>Any thoughts much appreciated.</DIV>
<DIV> </DIV>
<DIV>Ian</DIV>
<DIV> </DIV>
<DIV> </DIV>
<DIV> </DIV>
<DIV> </DIV>
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