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#!/usr/bin/perl -w
use POSIX ":sys_wait_h";

Timeon line     Calls     Timein subs
67µs            1    5.85ms
spent 5.85ms making 1 call to POSIX::import

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