Some versions (of perl?) are buggy and return a low resultion value: 

#!/usr/bin/perl
use Time::HiRes qw(gettimeofday);

for (1..10) {
   ($secs, $micro) = gettimeofday();
   print "$secs.$micro\n";
}

[download]

outputs 

1133364163.866375
1133364163.866375
1133364163.866375
1133364163.866375
1133364163.882000
1133364163.882000
1133364163.882000
1133364163.882000
1133364163.882000
1133364163.882000

[download]

on my ActivePerl 5.8.0

In reply to Re: OT How fast a cpu to overwhelm Time::HiRes by ikegami
in thread OT How fast a cpu to overwhelm Time::HiRes by zentara

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