[ View Thread ] [ Post Response ] [ Return to Index ] [ Read Prev Msg ] [ Read Next Msg ]

BGonline.org Forums

AVX on AMD processor

Posted By: eXtreme Gammon
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

 

Post Response
Your Name:
Your E-Mail Address:
Subject:
Message:

If necessary, enter your password below:

Password:
 

 

[ View Thread ] [ Post Response ] [ Return to Index ] [ Read Prev Msg ] [ Read Next Msg ]

BGonline.org Forums is maintained by Stick with WebBBS 5.12.