Daniel Andersen <zedar@free2air.com.au> writes:
> [4059] DEBUG: connection startup failed (fork failure): Resource
> temporarily unavailable
> [4059] DEBUG: could not launch checkpoint process (fork failure): Resource
> temporarily unavailable
Hmm ... a fork failure suggests resource exhaustion somewhere in the
kernel. Do you have enough swap space? A large enough NFILE (kernel
filetable size) setting?
> there are generally up to 200 copies of postmaster running at any given time,
200 * a few dozen open files per backend is a lot of open files. I'm
betting on NFILE being the issue, myself.
Linuxen tend to lie through their teeth about the number of open files
they can support per-process (sysconf(_SC_OPEN_MAX)). In 7.2 you can
compensate for that by setting PG's config variable
max_files_per_process to something sane, maybe 50 to 100.
You'll still need to make sure that the kernel is configured to support
max_files_per_process * max_connections open files, but at least that's
a definable number now.
regards, tom lane