Help needed for Laptop with AMD video

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Terror Australis
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Message 1889366 - Posted: 12 Sep 2017, 2:19:39 UTC

I've just bought a new Dell laptop fitted with an AMD R7 M445 GPU chip

I've installed BOINC and the Lunatics app, but GPU performance is "disappointing".

Running just one instance, the GPU takes over an hour to crunch a unit, not much better than the CPU

GPUZ shows zero GPU activity, while another monitoring program is indicating ~100% usage, so I'm not sure where I stand. According to the specs the GPU should be as good as the GTX750's I run on another box

Up until now I've always been an Nvidia man, so I have no knowledge of the dark art of AMD tuning :),

Can anyone suggest what performance I should be getting and some tweaks to get it there ?

TIA
T.A.
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Message 1889374 - Posted: 12 Sep 2017, 3:42:42 UTC

I will look at it after work.
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Message 1889388 - Posted: 12 Sep 2017, 8:46:06 UTC

Probably 1, its a laptop, so its probably thermal throttling
2, my 940mx which has similar performance(in games at least), take about as long as your dGPU
3, if you want to try, there are some tuning things you can try to do
Here is mine for my 940mx, tweak as needed
-spike_fft_thresh 2048 -tune 1 64 1 4 -period_iterations_num 20
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Message 1889417 - Posted: 12 Sep 2017, 11:45:48 UTC

it takes 30mn on 2bits WU and 40mn on 4bits WU with a HD7750 ;)

perhaps some low performance energy profile , try the strongest one ?
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Profile MikeProject Donor
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Message 1889504 - Posted: 13 Sep 2017, 12:23:06 UTC

Try this one.

-sbs 384 -period_iterations_num 20 -spike_fft_thresh 2048 -tune 1 64 1 4 -oclfft_tune_gr 256 -oclfft_tune_lr 16 -oclfft_tune_wg 256 -oclfft_tune_ls 512 -oclfft_tune_bn 32 -oclfft_tune_cw 32

This should give a little speed up.
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Terror Australis
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Message 1890076 - Posted: 15 Sep 2017, 23:54:55 UTC - in response to Message 1889504.  

Try this one........
This should give a little speed up.

Thanks Mike - That did help, it nearly doubled the crunching speed. It now takes around an 1:15hr for a "guppi" VLAR and up to 45 minutes for a normal unit. Still not what I thought it would be capable of...

One thing I did notice is that it's using very little CPU time, only a couple of percent. Is this normal for the ATI app ? Most of the opencl apps I've dealt with have been pretty CPU intensive.

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Grant (SSSF)
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Message 1890088 - Posted: 16 Sep 2017, 0:43:27 UTC - in response to Message 1890076.  
Last modified: 16 Sep 2017, 0:44:58 UTC

One thing I did notice is that it's using very little CPU time, only a couple of percent. Is this normal for the ATI app?

My understanding is, yes.
The OpenCL applications on AMD hardware have low CPU usage, as do CUDA applications on Nvidia hardware (although the more powerful the video card, and the more aggressive the settings, then the more CPU support is required to produce that extra GPU output).
The high CPU usage for OpenCL on Nvidia hardware is a result of their OpenCL implementation.
Grant
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Message boards : Number crunching : Help needed for Laptop with AMD video


 
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