Re: Runaway CPU and memory on high load

Would it be possible to combile backhand into apache on that machine 
and attach GDB to one of the run-away processes.  I've heard of that 
problem before.  It appears to be some sort of infinite recursion (as I 
don't see how infinite loops would occur in the code).  If you can gdb 
it, break it and give me a full backtrace I will try to get to the 
bottom of the problem.

On Tuesday, May 27, 2003, at 17:37 US/Eastern, Brian McCashin wrote:

> I've been running  backhand 1.2.2 and apache 1.3.27/php 4.3.0 
> RH7.1(2.4.2-2)  tenuously
> for 2 weeks now. (It was a backup plan for a failed Aeropoint.)
> My moderator handles ~600 hits per second at the daily peak
> to four backend servers all (except 1) Dual 800 Xeons.
>
> The problem is that after a short time 1 or 2 apache processes start 
> growing
> and sucking up CPU. If got a cron'ed job to kill processes if they 
> exceed
> 15Meg in VM but without this the moderator would soon run out of 
> memory.
> Config follows.
> Also I don't use byBusychildren because one of the backend never show 
> servers
> in use and gets all new traffic.
>
> I'm renicing the moderator and the moderator has keepalives off 
> whereas the rest are on.
> Any ideas??
>
> <IfModule mod_backhand.c>
>   UnixSocketDir /usr/local/apache/backhand
>   MulticastStats 10.0.0.200 10.0.0.255:4445
>   AcceptStats 10.0.0.0/24
>   BackhandModeratorPIDFile /usr/local/apache/backhand/moderator.pid
> BackhandConnectionPools off
>   <Location "/backhand">
>     SetHandler backhand-handler
>   </Location>
> </IfModule>
>
> <Directory "/usr/local/apache/htdocs">
>      Backhand removeSelf
>      Backhand byAge
>      Backhand bySession
> </Directory>
>
>
>
>
>
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-- 
Theo Schlossnagle
Principal Consultant
OmniTI Computer Consulting, Inc. -- http://www.omniti.com/
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