After consulting with [irc://irc.perl.org/#plack], there is a flag for that 

00:07    mst    : have your application set $env->{'psgix.harakiri'} e
+very N requests should do the trick

[download]

Its mentioned in http://search.cpan.org/~miyagawa/PSGI-1.09_3/PSGI/Extentions.pod

psgix.harakiri: A boolean which is true if the PSGI server supports harakiri mode, that kills a worker (typically a forked child process) after the current request is complete.

psgix.harakiri.commit: A boolean which is set to true by the PSGI application or middleware when it wants the server to kill the worker after the current request.

In reply to Re^2: Plack/FastCGI: how to make workers periodically die? by Anonymous Monk
in thread Plack/FastCGI: how to make workers periodically die? by locked_user sundialsvc4

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