PGI User Forum

Could you clarify the usage of acc_set_device_num(devicenum,devicetype):

For the device number, are the GPUs numbered 0, 1, 2, ... or 1, 2, 3... I thought it was the former, but according to this l ...

Thanks Mat, that mostly did the trick (I get the correct output now, it just crashes occasioanlly but less often with PGI_ACC_SYNCHRONOUS=1).

I had another question with reguards to something you s ...

Is this just a snip-it and you've cut out code? If not, then I'm wondering if "i" is uninitialized.

Oh wow, you're right! Can't believe I forgot this. I meant to have myid instead of ...

Hi again- so at the moment I'm splitting the work of a loop between two GPUs, and using OMP to do so. I'm not expecting this to work well for reasons you have mentioned, but I'm still curious.

Prev ...

Thanks Mat.

Though, I think in my case it is wallclock time, because for some reason the profiler thinks I only have a single-threaded program. (And the time only adds up correctly when it is count ...