Thread: gcwsieve
View Single Post
Old 2007-04-21, 03:14   #15
geoff's Avatar
Mar 2003
New Zealand

115710 Posts

Originally Posted by em99010pepe View Post
Just tested the latest version on my P4 3.0Ghz HT and got a decrease of sieve speed from 222 kp/s to 190kp/s.
Thanks. For comparison at p=1500e9 with the 4352 term sieve file: on my 2.9GHz HT P4 I get 290 kp/s, or 505 kp/s by running two hyperthreads.

I'm not really sure what is going on with the speeds here, some of the code is the same as is used in sr5sieve, but the main loop is different so there are more possible complications. It may be that by trying to finely optimise for my own machines, I am making code that will not run fast on any others.
geoff is offline