Hello Monks, I'm developing a perl script to import data from a file and put it a MySQL Database. I'm using a Threaded::Queue to put each line of the file, and in parallel N threads to read from that queue and put it in the DB. In Sun Solaris (UltraSPARC T2) we must use parallelism in order to take advantage from the CPU. However i'm not getting improvements when increasing the number of threads to process the Thread::Queue. We are getting processing times very similar for both approaches, using and not using threads. I'm already try to use two parallel Queues and the results are similar. Any tips? Snnipet of the script: 
#!/opt/coolstack/bin/perl -w

use strict;
use POSIX;
use threads ('yield',
                 'stack_size' => 64*4096,
                 'exit' => 'threads_only',
                 'stringify');

use Thread::Queue;

my $nthreads = 16;

my $indata = new Thread::Queue;

print "START PARSER: " . localtime() . "\n";

my @tloaders;

print "LAUNCH LOADER THREADS\n";

my ($thr) = threads->create(\&load, $fname);
push @tloaders, $thr->tid();

print "LOADER THREADS LAUNCHED\n";

print "LAUNCH WORKER THREADS\n";


for (my $i=0; $i < ($nthreads); $i++) {
    my ($thr) = threads->create(\&analyse );
}

print "WORKER THREADS LAUNCHED\n";

print "WAITING FOR LOADERS TO FINISH\n";

foreach my $i (@tloaders) {
  my $thr = threads->object($i);
  print "WAITING ON THREAD: " . $thr->tid() . "\n";
  $thr->join();
}

print "LOADERS HAVE FINISHED: " . localtime() . "\n";

for (my $i=0; $i < ($nthreads); $i++) {
  $indata->enqueue("STOP");
}

foreach my $thr (threads->list()) {
  print "WAITING ON THREAD: " . $thr->tid() . "\n";
  $thr->join();
}

print "END PARSER: " . localtime() . "\n";

exit;

[download]
Perl Version 
$ perl -v

This is perl, v5.8.8 built for sun4-solaris-thread-multi

Copyright 1987-2006, Larry Wall

[download]

In reply to Sun Solaris (SPARC processor) + Threads + performance/optimization by gulden

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