I was recently running some timing test for GPU based computing on a Macbook Pro with a Core 2 processor. I was amazed that the tiny little GPU on my Macbook seemed to be outperforming the GPU in my desktop. But, then I noticed that when I ran really long jobs, the laptop was taking much longer than the desktop. I finally realized that the laptop was actually slowing down the system clock (which is what the CPU was using for the timing routines) because the CPU was idle while the GPU was crunching... the result was fewer "cycles" for the computation!
Moral of the story is that mobile platform timing is tricky!! --jason On Tue, Mar 3, 2009 at 7:34 PM, Jeff Gilchrist <jeff.gilchr...@gmail.com> wrote: > > On Tue, Mar 3, 2009 at 6:29 PM, <ja...@njkfrudils.plus.com> wrote: > >> I've heard somewhere that if you are not running on all the cores on a chip , >> then the clock frequency can be increased and still keep within the same >> overal thermal envelope. I dont know if thats core2 or not , perhaps core >> i7 ? > > That is the i7, it can adjust voltage and other settings on individual > cores. But the Mobile Core2's also can do some funky things with > power saving features. Disabling things in Windows only turns off the > higher-level features. The lower level stuff you need to disable in > the BIOS but I doubt Brian's DELL machine would give him access to > those options since DELL BIOS features are quite lacking. > > Jeff. > > > > --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "mpir-devel" group. To post to this group, send email to mpir-devel@googlegroups.com To unsubscribe from this group, send email to mpir-devel+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/mpir-devel?hl=en -~----------~----~----~----~------~----~------~--~---
