Re: Having problems starting ~10k worker threads in apache

On Tue, 2007-09-18 at 11:34 -0400, Ijaaz A. Ullah wrote:
> I'm trying to create an instance of apache that spawns ~10k worker
> threads.  Due to design requirements, I can only use RHEL3 for this
> application.
> 
> Here is the contents of my <IfModule worker.c>
> 
> <IfModule worker.c>
> ThreadLimit             400
> ServerLimit             32
> StartServers            32
> MaxClients              12800
> MinSpareThreads         12600
> MaxSpareThreads         12800
> ThreadsPerChild         400
> MaxRequestsPerChild     0
> </IfModule>
> 
> 
> No matter what combination I use, I can not go higher than about 7k.
> Anything past that gives me these errors:
> 
> 
> [Tue Sep 18 15:07:36 2007] [alert] (12)Cannot allocate memory:
> apr_thread_create: unable to create worker thread
> [Tue Sep 18 15:07:37 2007] [alert] (12)Cannot allocate memory:
> apr_thread_create: unable to create worker thread
> 
> Any help would be appreciated.

Perhaps a silly questions, but have you increased "threads-max"
in /proc/sys/kernel?  It seems like the older RHEL3 systems defaulted to
around 8k threads system wide, which somewhat matches with your
observations.

A command something like the following should work:

sysctl -w kernel.threads-max=15000

If that works for you just add the parameter to your /etc/sysctl.conf
file and you'll be good on future reboots.

Later,
Tom


--
Taroon-list mailing list
[email protected]
https://www.redhat.com/mailman/listinfo/taroon-list