inefficient,--diff,cloc just uses one cpu core to run about cloc HOT 8 CLOSED

I agree --diff can be terribly slow, esp for substantial projects.

I don't have experience writing multithreaded Perl so it may be quite some time before I am able to spread the diff work across multiple cores.

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I can understand.
Thanks for your reply.

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I've been working on a version of cloc which uses multiple processes for counts and diffs. The code is in the multiproc branch of my fork. It works okay on the Linux systems I've tried, but I haven't tested it on other OSes yet.

If anyone else is interested in trying it out before I send a PR that would be great.

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I took a look (but haven't run it yet); quite a bit of work there, thanks for taking this on. I'll need to spend time with Parallel::ForkManager to appreciate the nuances.

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@stsnel : I'm finally ready to devote time to supporting Parallel::ForkManager. Can you git pull from my master to bring your fork up-to-date?

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@AlDanial : great :) I'll update my branch and check that the parallel code still works with the new cloc version. I expect I'll be able to submit a PR in a couple of days.

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@stsnel : Take your time with the PR; the holiday next week (here in the US) will keep me offline for a while.

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With the latest commit, use --processes=4 for example to use 4 cores.

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