Prime95 (crashing) and GFNsieve

[pepi37]

Hi!
I like Prime95 (29.4 beta8) for more reasons and until now I didnot find any problem using Prime95 with other programs. So what is problem?
I setup Prime95 to use 3 of 4 cores ( one worker) on my I7 ( HT is off). So 3 cores running Prime95 and one is free for feed GPU . So solution ( I assume ) is somehow connected with affinity . If I run Prime95 and GFN sieve and dont setup anything all is working but CPU usage is no more then 65% ( peak value)
If I give to Prime95 with affinity settings ( Win 7 x76) three cores ( 0,1and 2) and give last core(core number 3) for GFN sieve Prime95 stop working in minutes.
Then I switch to same scenario but now with LLR and I got perfect stable work for days.
So what I fail to do , or better to say , what I do wrong?
Any idea?

[henryzz]

Originally Posted by pepi37

Hi!
I like Prime95 (29.4 beta8) for more reasons and until now I didnot find any problem using Prime95 with other programs. So what is problem?
I setup Prime95 to use 3 of 4 cores ( one worker) on my I7 ( HT is off). So 3 cores running Prime95 and one is free for feed GPU . So solution ( I assume ) is somehow connected with affinity . If I run Prime95 and GFN sieve and dont setup anything all is working but CPU usage is no more then 65% ( peak value)
If I give to Prime95 with affinity settings ( Win 7 x76) three cores ( 0,1and 2) and give last core(core number 3) for GFN sieve Prime95 stop working in minutes.
Then I switch to same scenario but now with LLR and I got perfect stable work for days.
So what I fail to do , or better to say , what I do wrong?
Any idea?

Does your power supply have enough capacity? Is your pc capable of cooling both the cpu and gpu running at once at full pelt.

[pepi37]

Originally Posted by henryzz

Does your power supply have enough capacity? Is your pc capable of cooling both the cpu and gpu running at once at full pelt.

GPU is nearly at 65°C and CPU is at 70°C
Power supply is 800W ( and consumption of whole PC is around 270 W)
And last with LLR ( 3 cores per test) ( so same CPU usage and same power usage) works without any problem

[henryzz]

Originally Posted by pepi37

GPU is nearly at 65°C and CPU is at 70°C
Power supply is 800W ( and consumption of whole PC is around 270 W)
And last with LLR ( 3 cores per test) ( so same CPU usage and same power usage) works without any problem

Did you try the 3 cores with the affinity set without the gpu usage?
Is it the only gpu app that does this?

[pepi37]

Originally Posted by henryzz

Did you try the 3 cores with the affinity set without the gpu usage?
Is it the only gpu app that does this?

Three cores ,and also combination of those cores and GPU for ( affinity)
For example core 0 2 3 for Prime95 and core 1 for GPU
or Core 1 2 3 for Prime95 and core0 for GPU
So far only one I find problem.

[mackerel]

What is CPU model, CPU clock and ram speed/configuration? I might have a guess depending on the outcome. Also, any particular FFT size(s) failing?

[pepi37]

Originally Posted by mackerel

What is CPU model, CPU clock and ram speed/configuration? I might have a guess depending on the outcome. Also, any particular FFT size(s) failing?

I7-2700K
3600 Mhz
Ram is 2*4 GB 1333 Mhz
FFT is testing and falling is 384K
To repeat myself, with same CPU and speed and load ,and configuration, and FFT size with LLR works ok now over 4 days

[mackerel]

Originally Posted by pepi37

To repeat myself, with same CPU and speed and load ,and configuration, and FFT size with LLR works ok now over 4 days

From memory, in the Prime95 stress test options you can select complex FFTs or not. For reasons beyond me, I understand it uses non-complex for P95 workloads, but LLR may use complex ones. It would be interesting to see if this option changes it similar to LLR. Maybe the code works in a different enough way to cause or not cause the problems.