it turns out, I can simply store the bi-gram array directly as part of the hash..

That will work, but be aware that accessing the data in a shared data structure is significantly slower than accessing non-shared memory. This is due to the need for internal locking amongst other things.

So if you run a second pool of threads, each accessing that shared hash containing shared arrays, the lock contention between the threads will likely slow your processing to a crawl. (A simple fact of life with perl's shared data structures).

Try the version I posted and see how you get on.

With the rise and rise of 'Social' network sites: 'Computers are making people easier to use everyday'
Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
"Science is about questioning the status quo. Questioning authority".
In the absence of evidence, opinion is indistinguishable from prejudice.

RIP Neil Armstrong

In reply to Re^3: dynamic number of threads based on CPU utilization by BrowserUk
in thread dynamic number of threads based on CPU utilization by mabossert

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