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root |
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#!/usr/bin/perl |
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# ->resume is not exactly cheap (it saves/restores a LOT |
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# of global variables), but shouldn't be slow. just to show |
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# how fast it is, this little proggie compares a normal subroutine |
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# call with two calls of transfer in a loop. |
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use Coro; |
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use Benchmark; |
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$a = bless {}, main::; |
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# do something similar, switch two global vars and return something |
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sub a { |
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$old = $current; |
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$current = $_[0]; |
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} |
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$b = new Coro sub { |
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# do a little unrolling... |
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while() { |
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$Coro::main->resume; $Coro::main->resume; $Coro::main->resume; |
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} |
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}; |
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$b->resume; # the first resume is slow because it allocates all the memory |
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$main = $Coro::main; |
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sub transfer { |
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Coro::_transfer($_[0], $_[1]); |
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} |
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$c = Coro::_newprocess { |
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while() { |
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transfer($c, $main); transfer($c, $main); transfer($c, $main); |
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} |
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}; |
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transfer($main, $c); |
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timethese 100000, { |
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method => '$a->a; $a->a; $a->a; $a->a', |
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resume => '$b->resume; $b->resume', |
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transfer => 'transfer($main, $c); transfer($main, $c)', |
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}; |
