Forum > GPU crunching

Cuda + 8600M GT 185.85

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Raistmer:
And no CPU fall back? Fine, thanks

SilverL:
If this helps any, after I relogged into my computer it changed my resolution back to max. Then the current WU got a computation error. So I think the resolution is playing the biggest part in limiting.

This is from the stderr for the new one that started.

setiathome_CUDA: CUDA Device 1 specified, checking...
   Device 1: GeForce 8600M GT is okay
SETI@home using CUDA accelerated device GeForce 8600M GT
V10 modification by Raistmer
Priority of worker thread rised successfully
Priority of process adjusted successfully
Total GPU memory 268435456    free GPU memory 223932416
setiathome_enhanced 6.02 Visual Studio/Microsoft C++

Build features: Non-graphics   VLAR autokill enabled    FFTW   x86   
     CPUID: Intel(R) Core(TM)2 Duo CPU     T9300  @ 2.50GHz

     Cache: L1=64K L2=6144K

CPU features: FPU TSC PAE CMPXCHG8B APIC SYSENTER MTRR CMOV/CCMP MMX FXSAVE/FXRSTOR SSE SSE2 HT SSE3
libboinc: 6.4.5

Work Unit Info:
...............
WU true angle range is :  0.448219
Cuda error 'cudaMalloc((void**) &dev_t_funct_cache' in file 'd:/BTR/SETI6/SETI_MB_CUDA/client/cuda/cudaAcc_pulsefind.cu' in line 663 : out of memory.
setiathome_CUDA: CUDA runtime ERROR in device memory allocation (Step 3 of 3). Falling back to HOST CPU processing...

Josef W. Segur:
So "free GPU memory 229027840" worked, but "free GPU memory 223932416" didn't. The first is 218.42  MiB, the second 213.56 MiB. That may not be the only factor, but seems likely to be primary. Other data indicated the allocations take exactly 89 MiB, the critical point may be that 213.56 - 89 is less than 128 MiB, but 218 - 89 is more. Could there be a restriction that CUDA apps must leave 128 MiB free?
                                                                                    Joe

SilverL:
Seti does require more than 128MB. Its why my previous card(8400M GS) wouldnt work.

But might also need to leave some for the card to fuction properly. This is interesting. 128 is a lot though for a dedicated a card.

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