AVX on AMD processor
Posted By: eXtreme Gammon In Response To: Fastest Windows laptop under $500? (Frank Berger)
Date: Friday, 7 June 2013, at 12:45 a.m.
In Response To: Fastest Windows laptop under $500? (Frank Berger)
AS Frank Berger mentioned, the AMD architecture is to have dual units rather than Hyper threading for Intel.
However, AMD FPU SIMD has 2 SSE units but only one AVX. Thinking about it, I can see that it creates a bottleneck: 2 threads access the single AVX unit and one has to wait for the other to complete.
Chuck, Tim (or anyone having an recent AMD processor) try to run XG with "-noAVX" as parameter on the shortcut. i suspect it may be faster. You can verify the parameter was taken into account from the menu help>>about, in the information tab the Engine line should show "4.30 (SSE2, 4 threads)" rather than "4.30 (AVX, 4 threads)".
Thanks for reporting the calibration numbers before and after the command line change.
Messages In This Thread
BGonline.org Forums is maintained by Stick with WebBBS 5.12.