Re: Too many open files

From my /etc/rc.d/rc.local:

# increase RCVBUF to optimize proxy<->backend
echo 131072 > /proc/sys/net/core/rmem_max
# increase maximum opened files
echo 8192 > /proc/sys/fs/file-max
# increase shared memory
echo "100000000" > /proc/sys/kernel/shmmax

Regards,

Oleg

On Wed, 1 Aug 2001, Tom Lane wrote:

> Darin Fisher <darinf(at)pfm(dot)net> writes:
> > I am running PosgreSQL 7.1 on Redhat 6.2 Kernel 2.4.6.
> > Under a pretty heavy load:
> > 1000 Transactions per second
> > 32 Open connections
>
> > Everything restarts because of too many open files.
> > I have increase my max number of open files to 16384 but this
> > just delays the inevitable.
>
> > I have tested the same scenario under Solaris 8 and it works
> > fine.
>
> Linux (and BSD) have a tendency to promise more than they can deliver
> about how many files an individual process can open. Look at
> pg_nofile() in src/backend/storage/file/fd.c --- it believes whatever
> sysconf(_SC_OPEN_MAX) tells it, and on these OSes the answer is likely
> to be several thousand. Which the OS can indeed support when *one*
> backend does it, but not when dozens of 'em do it.
>
> I have previously suggested that we should have a configurable upper
> limit for the number-of-openable-files that we will believe --- probably
> a GUC variable with a default value of, say, a couple hundred. No one's
> gotten around to doing it, but if you'd care to submit a patch...
>
> As a quick hack, you could just insert a hardcoded limit in
> pg_nofile().
>
> regards, tom lane
>
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Regards,
Oleg
_____________________________________________________________
Oleg Bartunov, sci.researcher, hostmaster of AstroNet,
Sternberg Astronomical Institute, Moscow University (Russia)
Internet: oleg(at)sai(dot)msu(dot)su, http://www.sai.msu.su/~megera/
phone: +007(095)939-16-83, +007(095)939-23-83