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From:walt Date:March 17 2003 5:48pm
Subject:Re: Process Limit on Linux ?
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Philipp wrote:
> 
> Hi there,
> 
> i wrote several times to the list asking for help with a problem
> regarding process limits on linux, but never got an answer.
> today i found this story:
> 
> http://www.mysql.com/press/user_stories/handy.de.html
> 
> here are the relevant sentences:
> 
> "We had some process limit problems on our Linux Systems,
> but thanks to your support we where able to patch the linux boxes
> and move the limit to a size that meets our needs (we've got an average of
> about
> 1600 concurrent threads per server)."
> 
> These people use 2.2 Kernels so i dont know if the mentioned kernel and
> glibc
> patching is also relevant for me, as i am using 2.4 kernels only.
> 
> Here is my problem in detail:
> 
> i am using mysql-3.23.55 binary packages on linux 2.4.20 and i raised ulimit
> values and configuration in my.conf to allow more then 1500 threads. but
> when
> there are around 750 threads a new client connecting is told something like
> that (dont have the errno at the moment, i think its 11):
> 
> "cant create new thread, perhaps you are out of memory or there is a
> os-depended bug".
> 
> The machine only runs apache and mysql and is a Xeon 2x2 2.4 Gz with 2 GB of
> RAM.
> cat /proc/meminfo sais that more then 1 Gig is used for caching, so memory
> should be no
> problem .
> 
> Please, if you have any ideas, let me know. If it is a kernel issue, tell me
> to go to linux mailing lists
> or if its some kind of "secret issue" only the support will be able to
> answer let me know that.
> 
> Thanks in advance,
> Philipp
> 
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Philipp,
Did you check /proc/sys/kernel/threads-max? I know with oracle 8i, you
are supposed to increase  /proc/sys/kernel/shmmax as well as some other
values. You might check into that and see if changing those values will
help.
Does your syslog say anything when these problems occur?

walt

walt
Thread
Process Limit on Linux ?Philipp16 Mar
  • Re: Process Limit on Linux ?walt17 Mar
  • Re: Process Limit on Linux ?Philipp18 Mar
    • Re: Process Limit on Linux ?Joseph Bueno19 Mar
      • Re: Process Limit on Linux ?Philipp19 Mar
        • Re: Process Limit on Linux ?Dan Nelson19 Mar
          • Re: Process Limit on Linux ?Philipp19 Mar
            • Re: Process Limit on Linux ?Joseph Bueno19 Mar
            • Re: Process Limit on Linux ?Dan Nelson19 Mar
              • Re: Process Limit on Linux ?walt19 Mar
  • Re: Process Limit on Linux ?Philipp18 Mar