I've replaced the insert_into_db() by only making the 
$indata->dequeue();

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And i'm getting no advantage in increasing the threads number and the CPU usage its about 10%!!! Something is wrong... I'm not taking advantage of parallelism/threads. Should I use more threads? more Thread::Queues? more Thread::Queues and passed them to different processing threads? Is there any problem with Perl and/or threads on Solaris? Should I use Forks instead of Threads?

In reply to Re^2: Sun Solaris (SPARC processor) + Threads + performance/optimization by gulden
in thread Sun Solaris (SPARC processor) + Threads + performance/optimization by gulden

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