Esteemed Jethro: Well, since I am not using thread::shared that probably explains why i do get a speed up. BUT nothing like 300 times. I am basically doing lots of vector dot products. On my test code running with one thread takes 10 sec, with 4 threads it takes 2 sec, but my CPU usage is only up to 50% so i might could go faster.

For matrix multiplication i don't think i could ever beat the times of Math::GSL::Blas which have to be about the most optimized routines ever. So it sort of makes sense to me that trying to speed it up with shared data and threads wouldn't work.

Unfortunately to get my full matrices in memory i would need more than the 8 gig available, hence my plan to break up the data, do the dots with hashes which gets rid of the zeros, and do them in threads. Maybe not optimal, but it should get my .cgi scripts down to an acceptable time. hopefully.

Thanks for the Lehmann stuff, it was interesting and helpful.

In reply to Re^4: If I am tied to a db and I join a thread, program chrashes by lance0r
in thread If I am tied to a db and I join a thread, program chrashes by lance0r

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