Hi. thanks for the reply. I was thinking along these lines as well. Although grateful, I think your Inline::C solution might be over my head. But I will try to look for some way of speeding it up. The harddrive I/O for sure is an issue, but it shouldn't cause the script to be slower. If anything, at least it should be able to perform as well. But like you say, the copying of the hash is probably the issues.

In reply to Re^2: Using threads to process multiple files by anli_
in thread Using threads to process multiple files by anli_

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