Hello, On page:
http://localhost/glucas/doc/Configure-Make-and-Install.html#Configure%20Make%20and%20Install you will see the multithread options you can use at './configure' time. You can use Sunmp (for Sun compilers), Openmp (for compilers supporting that) and POSIX threads. The doc about the internals of how the work in a L-L test iteration is splitted is unclear and not updated. I must rewrite that. I'm sure that multithread code is not optimal, it not scale well for many processors. Its improvement will require a more carefull tunning work. It was hard to me the wrote the code with limited access to some systems (mainly HP test-drive site) from a Linux-PC box. The most severe bugs were found and fixed with the work and valuable help from Tony Reix and Jeff Gilchrist when verifying M41 and M42. Guillermo. El S�bado, 2 de Abril de 2005 04:47, Greg Edwards escribi�: > I think I have misunderstood the references to "multi-processor" L-L tests. > Dr Nowak's M42 was found in 50 days on his 2.4GHz P4, and verified in 5 > days on an Itanium 16p machine, but it looks like the Itanium app was > single-threaded. I have searched all of http://www.oxixares.com/glucas > <http://www.oxixares.com/glucas> and found no refernece to parallel > options. > As mentioned many times in this forum and the Gimps pages, the L-L test is > a consecutive linear algorithm, you can't cut it into parallel pieces. The > 50/5 ratio above is only about what one would expect from the P4/IA64 chips > and associated 8x cache size improvement etc, esp. as Glucas apparently > exploits an IA64 instruction set feature which doubles the performance of > L-L. > So it looks like I can't offer to verify M43 in a few minutes on a 512p > IA64 after all. > Greg E > > Greg Edwards > Technical Consultant > SGI > 11-17 Khartoum Road > North Ryde NSW 2113 Australia > Ph: +61 (0)2 8875 9580 (diverts to mobile) > Fx: +61 (0)2 8875 9480 -- Guillermo Ballester Valor [EMAIL PROTECTED] Ogijares, Granada SPAIN Linux user #117181. See http://counter.li.org/ Public GPG KEY http://www.oxixares.com/~gbv/pubgpg.html _______________________________________________ Prime mailing list [email protected] http://hogranch.com/mailman/listinfo/prime
