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From: PerlFAQ Server on 19 Apr 2010 00:00
This is an excerpt from the latest version perlfaq8.pod, which
comes with the standard Perl distribution. These postings aim to
reduce the number of repeated questions as well as allow the community
to review and update the answers. The latest version of the complete
perlfaq is at http://faq.perl.org .

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8.17: How can I measure time under a second?

(contributed by brian d foy)

The "Time::HiRes" module (part of the standard distribution as of Perl
5.8) measures time with the "gettimeofday()" system call, which returns
the time in microseconds since the epoch. If you can't install
"Time::HiRes" for older Perls and you are on a Unixish system, you may
be able to call gettimeofday(2) directly. See "syscall" in perlfunc.



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so please include as much information as possible and relevant in any
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corrections to examples that do not work on particular platforms.
Working code is greatly appreciated.

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