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#!/usr/bin/perl
# Test code for the evaluation of threads efficiency
# This version uses only a single select to read the result of the remote execution
# of several 'ls' commands
# This is the best performing of the three versions
use strict;
use IO::Select;
my $num_commands = 64;
my $select = IO::Select->new;
my $i;
for ($i=0; $i<$num_commands; $i++)
{
my $fd;
open $fd,"ls|" or die $!;
$select->add($fd);
}
while ($i)
{
my @select_result = $select->can_read;
while (scalar(@select_result))
{
my $buffer;
my $fd = shift @select_result;
my $result = sysread($fd, $buffer, 4096);
if ($result > 0)
{
print $buffer;
}
elsif ($result == 0)
{
$select->remove($fd);
close($fd);
$i--;
}
else
{
die $!;
}
}
}
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