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#!/usr/bin/perl
use Switch;
use List::Util 'shuffle'; # standard from Perl 5.8 and later
my $tempfile = "multigcc.out";
my @params;
my @files;
my $list = \@params;
# parse command line arguments
for my $a (@ARGV) {
if ($a eq "--") {
$list = \@files;
next;
}
push @{$list}, $a;
}
exit if (not @files);
my $command = join " ", @params;
# shuffle the file list to spread the load as evenly as we can
@files = shuffle(@files);
# count number of cores
my $cores;
switch($^O) {
case "darwin" {
chomp($cores = `sysctl -n hw.ncpu`);
$cores = 1 if ($?);
}
case "solaris" {
$cores = scalar grep /on-line/i, `psrinfo`;
$cores = 1 if ($?);
}
else {
if (open CPUINFO, "</proc/cpuinfo") {
$cores = scalar grep /^processor/i, <CPUINFO>;
close CPUINFO;
}
else {
$cores = 1;
}
}
}
# fork children
my @pids;
my $slice = int((scalar @files + $cores) / $cores);
# reset $cores to 0 so we can count the number of actually used cores
$cores=0;
for (my $i=0;$i<scalar @files;$i += $slice)
{
my $pid = fork;
if ($pid)
{
# mother
$pids[$cores++] = $pid;
}
else
{
# get my slice of the files
my @list = @files[$i .. $i + $slice - 1];
# run command
system("$command @list > $tempfile.$$");
exit;
}
}
for my $i (0 .. $cores - 1)
{
# wait for child to complete
waitpid $pids[$i], 0;
# read & print result
if (open F, "<$tempfile.$pids[$i]")
{
print <F>;
close F;
unlink "$tempfile.$pids[$i]";
}
}
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