Are you sure it's the contents of the loop that are slow, and not the reading of the ZIP file? Try Devel::NYTProf to find the acutal bottleneck.

Also there are some things you can improve within the loop before investigating parallelism.

For one you can look up $categories{$k}->{traces} once outside the whole loop.

It might also be much faster to join all those regexes together to a single regex and match it once, instead of iterating over the regexes (Don't know if that works in your case).

Also you seem to read the whole file into memory first, and then iterate over it - that's rather inefficient. Instead use 

OUTER: while(my $line = <GZIP>) {
...

[download]

to read it line by line.

Parallelization is usually a lot of trouble, so try the conventional optimization wisdom first.

(Update: removed one comment that's not applicable; added hint aboute memory usage).

In reply to Re: An efficient way to parallelize loops by moritz
in thread An efficient way to parallelize loops by Deus Ex

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