Subprocess errors

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http://www.unix.com – Hi Guys, Just a question about subprocesses.. Lately one of our servers has started to throw out the following error: SYSTEM ERROR: Too many subprocesses, cannot fork. Errno=12 We've already increased the threshold twice. Its now up to 8000 and the swap space has also been increased. We had rebooted the server to clear out any old processes that may have been running but we have since hit the same error. Whats the best way to find whats creating so many subprocesses? I'm not 100% sure what the error actually means.. Running AIX 5.3 and its a ksh shelll.. (HowTos)