Re: Matrix multiplication: performance drop

2009-03-03 Thread Joern Rennecke
Gcc usage questions should go to the gcc-help mailing list. Questions about computer architecture should go to another forum, like comp.arch, but you should check first if they explain caches, DRAM pages, and memory hierarchies in general in an FAQ. If you had a constructive proposal how to impr

Re: Matrix multiplication: performance drop

2009-03-03 Thread Michael Meissner
On Tue, Mar 03, 2009 at 03:44:35PM +0300, Yury Serdyuk wrote: > So for N multiple of 512 there is very strong drop of performance. > The question is - why and how to avoid it ? > > In fact, given effect is present for any platforms ( Intel Xeon, > Pentium, AMD Athlon, IBM Power PC) > and for gcc