Dear PerlMonks, I just migrated from RHEL5 to RHEL6 in one of my working project. Due to this Perl version has also been upgraded from Perl 5.8.8 to Perl 5.10.1 (Base Perl Package of RHEL 6.6). I observed few behavioral as well as performance Impact for the same Perl scripts which was used in Perl 5.8.8. Sharing few instances below: Profiler used: NYTProf 5.06

1st Instance. Test.pl 
#!/usr/bin/perl -w
use POSIX ":sys_wait_h";

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profiler Output with Perl 5.8.8: 
Timeon line     Calls     Timein subs
67µs            1    5.85ms
spent 5.85ms making 1 call to POSIX::import

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profiler Output with Perl 5.10.1: 
Timeon line     Calls     Timein subs
178µs             2     23.0ms    
spent 17.9ms (935µs+16.9) within main::BEGIN@3 which was called: # onc
+e (935µs+16.9ms) by main::RUNTIME at line 3
use POSIX ":sys_wait_h";
# spent 17.9ms making 1 call to main::BEGIN@3 # spent 5.17ms making 1 
+call to POSIX::import

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Query: Why is this extra call is going in Perl 5.10.1 Is it the reason for increase in time.

In reply to Performance and Behavioral changes in Perl 5.8.8 and Perl 5.10.1 by ManasMarwah

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