Hmm, I hadn't even thought about ulimit. I thought those settings were per-process, not per-user. If they are per-user they could be problematic.
not sure if it's per user or per process. after i did ulimit -n unlimited the problem joe describes went away for me. i also did lower max_files_per_process to 1000. my database has a large number of files in it, a few thousand, so i assumed one of the back end processes was going over the limit.
--brian
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