Re: Runaway CPU and memory on high load

I've never gdb'ed an apache module. Do I have to only compile symbols 
into the backhand module or apache as well
to get a usable backtrace.

On Tuesday, June 3, 2003, at 08:36 AM, Theo Schlossnagle wrote:

> 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/
> Phone:  +1 410 872 4910 x201     Fax:  +1 410 872 4911
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