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root |
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#!/usr/bin/perl |
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# calculcate average latency |
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use Linux::AIO; |
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use Time::HiRes qw(time); |
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use File::Glob qw(); |
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my $START = time; |
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my $SELECT; |
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for(File::Glob::glob "/fs/anime/eps/*Basara/*") { |
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my $fh; |
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print "$_\n"; |
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open $fh, "<", $_ or die "$_: $!"; |
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push @fh, $fh; |
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} |
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root |
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Linux::AIO::min_parallel 8; |
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root |
1.1 |
$nreqs = 50; |
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my $lat; |
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my $cnt = 1e-36; |
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$|=1; |
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sub gen_request { |
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my $fh = @fh[rand @fh]; |
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my $offset = int rand 75000000; |
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my $data; |
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my $start = time; |
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#print "starting new req ($fh, $offset)\n"; |
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root |
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aio_read($fh, $offset, 256*1024, $data, 0, sub { |
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root |
1.1 |
$start = time - $start; |
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$lat += $start; |
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$cnt++; |
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#print "io returned ($fh, $offset, $start)\n"; |
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}); |
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} |
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gen_request while (Linux::AIO::nreqs < $nreqs); |
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my $sr = ""; vec($sr, Linux::AIO::poll_fileno, 1) = 1; |
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while(1) { |
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if (Linux::AIO::nreqs < $nreqs) { |
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gen_request; |
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} else { |
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$SELECT -= time; |
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my $r; |
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select $r = $sr, undef, undef, undef; |
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$SELECT += time; |
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} |
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Linux::AIO::poll_cb; |
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printf "\r$lat $cnt %.2f %.3f ", $lat / $cnt, $SELECT/(time - $START); |
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} |
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