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Re^2: Compile Phase Time

by eye (Chaplain)
on Apr 20, 2013 at 12:51 UTC ( #1029638=note: print w/replies, xml ) Need Help??

in reply to Re: Compile Phase Time
in thread Compile Phase Time

Will this approach underestimate load times for modules later in the list when they share dependencies with modules earlier in the list?

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Re^3: Compile Phase Time
by Anonymous Monk on Apr 20, 2013 at 14:05 UTC

    Yes, but it doesn't really matter , whole exercise is silly. This version won't, but it will fail at loading Moose twice (or after moo)

    #!/usr/bin/perl -- use strict; use warnings; use Module::Load ; use Time::HiRes qw/ time /; @ARGV or @ARGV = qw/ CGI B::Deparse DBI DBD::SQLite Moose Moo /; for my $mod( @ARGV ){ my $tb = time; { local $SIG{__WARN__} = sub{}; undef %INC; load( $mod ); } my $ta = time; printf "%.5f - %.5f = %.5f %s\n", $ta, $tb, $ta - $tb, $mod; } __END__ $ perl fudge Moose Moo CGI CGI CGI CGI 1366466283.45313 - 1366466282.70313 = 0.75000 Moose 1366466283.52620 - 1366466283.45344 = 0.07276 Moo 1366466283.63069 - 1366466283.52631 = 0.10438 CGI 1366466283.73354 - 1366466283.63081 = 0.10273 CGI 1366466283.83594 - 1366466283.73366 = 0.10228 CGI 1366466283.93854 - 1366466283.83606 = 0.10247 CGI
      Thank you folks for the valuable info. I really appreciate it.
      With every run this code returns a different result with the difference being between .1 - .2 s Any ideas why ?

        With every run this code returns a different result with the difference being between .1 - .2 s Any ideas why ?

        That is how stuff works, there is variability in everything -- the harddisk spins, sometimes it takes more time to read a file, sometimes less, sometimes its retrieved completely from cache ... think of timing a run/sprint/race with a finger-clicked-stopwatch -- sometimes you run faster, sometimes timer/coach fingers/thumbs slower -- its why runs are averaged, its like statistics or something :)

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