Hi BrowserUk, use Async is a good solution. Since return value from paralleled subs is hash reference, I use the AsyncData use Async; $proc = AsyncData->new(sub {...}); But, I got errors. It says, "Magic number checking on storable string failed at /usr/lib64/perl5/5.8.8/x86_64-linux-thread-multi/Storable.pm line 416, at /usr/lib/perl5/site_perl/5.8.8/Async.pm line 128". I google searched. But, did not find any good explanation and solution. Do you have any idea? Gary

In reply to Parallel Modules ? by Gary Yang

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