Forum > GPU crunching
What is good settings for my ATI R5770?
Raistmer:
--- Quote from: Claggy on 05 Apr 2012, 08:34:43 pm ---This is the sort of load i get with ATI AP when there is minimal load:
Claggy
--- End quote ---
How many tasks per GPU in fly on that picures ?
Claggy:
--- Quote from: Raistmer on 06 Apr 2012, 02:52:13 am ---
--- Quote from: Claggy on 05 Apr 2012, 08:34:43 pm ---This is the sort of load i get with ATI AP when there is minimal load:
Claggy
--- End quote ---
How many tasks per GPU in fly on that picures ?
--- End quote ---
I only ever run 1 task per GPU, it enables me to see what the app is doing, rather than having multiple apps masking the problem,
Claggy
Raistmer:
Yes, your approach is right for app testing. Host performance suffer in such mode though.
But then your picture "kills" my method of bug/blanking discrimination.
There are spikes of bigger load (I think it's FFA) on you "low GPU bug" picture... And those spikes much less visible (though exist) in "full load" mode.
Raistmer:
BTW, look for memory graph.
There are "spikes" - they corresponds short FFA (most of them).
Look how often they occur on "fast"task and how wider (X-axis is time so wider =slower) they are on "slow" task.
But amount of computation between them is just the same!
Hence we have slowdown not just in some area of algorithm. Whole processing more or less equally slowed. single pulse search takes more and FFa takes more too.
It's important result cause it can decline assumption that there are just many false positives from near to threshold reesults in FFA so much more bus transfers are needed. In that case FFA would took much longer while single pulse (main loop) - not. So we would see disproportional increase in max or min memory usage time.
Claggy:
Another thing to note, when ATI AP app is suffering from low usage Bug, ATI driver restarts have occured on number of occasions,
normaly this occurs when i have been away from the computer, and i start browsing, driver restart occurs, i check SIV/GPU-Z and find there has been little ATI GPU usage,
and lots of elapsed time, and little % progress, suspending & resuming gets the app working with 80%+ GPU load,
on a couple of occasions i've come back from work and found the app a couple of hours in but with 0% done, i suspect a driver restart happened there too,
suspending/resuming has got it working.
Claggy
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