A quick googling found this for me. I haven't investiged this any further yet, but it seems to hint at the "maxuprc" kernel parameter, or some related setting. Check with /usr/sbin/kmtune what your settings are...

In reply to Re^3: Apache / 30,000 Perl script serving limit by almut
in thread Apache / 30,000 Perl script serving limit by QcMonk

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