What kind of profiler are you looking for? And what do you hope to achieve with it in conjunction with Perl's threading?

I've wanted to use a profiler on a multithreaded program before. I ended up just making a copy with the communications and AI threads commented out, and ran a few iterations of the physics loop using canned data

It was a bit of trouble to ensure that the thread amputation didn't substantially alter the program flow, while making improvements to the two versions in parallel.

I suspect from the OPs post, that he is looking for something like this, which is a very powerful tool.

But, whilst I think it could be used to great affect to tune perl's internal implementation of threading; it is not so useful for tuning iThreads user code, as it is a binary level rather than source-code level profiler. Trying to separate out the affects of user code from those of the Perl runtime code is pretty much impossible.

Like you, I also tend to tune my threaded Perl code by isolating each thread as far as possible and then tuning each thread in a stand-alone fashion.

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