Currently trying the Optix 3.0.0 beta...
What I find annoying is that their precompiled executables assume sm_20 (Geforce 2xx models) as minimum requirement. That corresponds to CUDA compute capability 2.0 and higher. I will try to recompile the samples to see if I can tweak them to run on older GPUs, like the one in my laptop.
UPDATE: no success, going back to Optix 2.6.0 (the latest stable release) worked for me.
A quick update: I was able to get two Optix samples that are advertised to work only with sm_20 to run on sm_11. The samples in question are mcmc_sampler, and the zoneplate sample. The problem is lack of an atomicAdd() for float values on this hardware. But the following function (if added to helpers.h) can replace atomicAdd() - it will just be somewhat slower. Just be sure to replace occurences of atomicAdd in some .cu files with MyAtomicAdd. In CmakeLists.txt, now edit options to require sm_11 instead of sm_2.0.
static __device__ __inline__ void MyAtomicAdd(float *address, float value)
{
int oldval, newval, readback;
oldval = __float_as_int(*address);
newval = __float_as_int(__int_as_float(oldval) + value);
while ((readback=atomicCAS((int *)address, oldval, newval)) != oldval)
{
oldval = readback;
newval = __float_as_int(__int_as_float(oldval) + value);
}
}
July 22, 2010, 12:55:34 PM
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