> 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:
> 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
> 1600 concurrent threads per server)."
> These people use 2.2 Kernels so i dont know if the mentioned kernel and
> 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
> 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
> 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,
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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
Does your syslog say anything when these problems occur?