Having woken up too early this morning, I put the numbers
available at http://www.mersenne.org/bench.htm into an Excel
worksheet and very briefly played with them. The worksheet is
available at http://web.mit.edu/zudark/www/MersenneSpeeds.xls
A few items of interest: The fastest timing per Mhz, relative to
a PPro/200, is the Athlon/500 which is 1.5 times faster. The
slowest is (not surprisingly) the sole 486 on the list, which is
only 13% as fast per Mhz as the PPro :)
I even dug out a 386SX/25; many years ago, I actually tried to test
2^60103-1 on the same machine (using the very first web-released
version of the GIMPS software!) before realizing it was too slow
even for that exponent. I guess there are some instructions in the
current executable which the floating point emulation can't handle,
however, so no timings from it :)
Ethan O'Connor
[EMAIL PROTECTED]
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