As an aside, the Plack subsystem (often used with FastCGI) has support for this in an obscure parameter called "harakiri." Aptly-named but hard to spot the docs. It terminates the worker after a specified number of requests.

In reply to Re: Forcing modperl processes to restart after N requests by Anonymous Monk
in thread Forcing modperl processes to restart after N requests by alain_desilets

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