09-29-2004
Jim it has to run fast in ksh. I am developing a decimal arithemtic based multipy with carry. As far as I know, this is new ground. If I was coding in C, I would use the mersenne twister in a minute. I have toyed with trying to code it in ksh, but it's tough and I wouldn't trust my implementation until I understand how it works. Maybe next year. Meanwhile I want to get the MWC working. It is almost as fast as linear congruential generator. It really should be able to rid the world of lcg's. They persist only because they are fast and easily coded. Diehard is the first test that it hasn't passed. Diehard needs about 80,000,000 bits of random data for a single test run. This takes about 10 hours to generate, so progress is slow. I'm pretty sure the problem is arising when I convert the raw random number to an output modulus. But it will take a week or so to be sure.
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