Sam Nilsson wrote:
> Hello,
>
> The error message: Can't create a new thread (errno 35); if you are
> not out of available memory, you can consult the manual for a possible
> OS-dependent bug
>
> Our website started getting this error several weeks ago (when we
> increased the number of application server machines connecting to the
> database from 5 to 7. It seems to happen anywhere from every 2 days
> to once a week, there does not seem to be a consistent pattern. Our
> CPU utilization, memory utilization, and number of HTTP Requests seem
> to be at "normal" (they are no where closed to being maxed out). When
> this error happens we CAN log onto the server with the MySQL database,
> but I CAN NOT use the mysql client to connect to the mysql database
> (localhost connection as root) - it reports the error mentioned
> above. The way we temporarily solve the problem is to restart one of
> our web servers.
>
> Here is our technology stack:
>
> Web Servers: 7, Each server has:
> 4 Gb of Memory on each server
> FreeBSD 6.2-RELEASE-p9
> 2.4 GHz CPU
> Apache 2.2
> Webware for Python
> Python 2.5
>
> DB Servers: One Master, Two Read Only (replication)
> 4 GB of Memory on each server
> FreeBSD 6.3-RELEASE-p3 FreeBSD 6.3-RELEASE-p3
> MySQL 5.0.1
>
>
> We have tried bumping up our number of max allowed connections (up to
> 1000) on MySQL and kern.ssize to 512Mb for FreeBSD. That did not
> help. The max connections usually hovers ~300, so it does not even
> get close to the 1000 we have set. Finally the last place that we
> have looked is the openfiles, it is set at 20,000 for the whole
> system, with 14K per process on the FreeBSD operating system.
>
>
> Here are some relevent items from my.cnf:
> - set-variable = max_connections=1000
> - set-variable = key_buffer_size=384M
> - set-variable = read_buffer_size=64M
> - set-variable = read_rnd_buffer_size=32M
> - set-variable = thread_cache_size=20
>
> Any help would be much appreciated.
>
> Thanks
> - Sam Nilsson
>
If you havent already, you could try increasing the per process memory
limit as per examples in
http://unix.derkeiler.com/Mailing-Lists/FreeBSD/hackers/2008-05/msg00258.html
(man tuning also says a bit about these tuneables but doesnt have the
examples that post does)
Vince
>
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