matthiasdiener / omptest Goto Github PK

Hi @matthiasdiener,
thank you for your GCC offloading compilation script. It helped me a lot. I am testing the offloading now, but I don't understand part of your test application.

• Let say you have N devices available. The loop just says that you offload the code N times, but you don't specify to which device to offload, so probably it will be offloaded always to the same device. Am I right?
• Specification says that omp_is_initial_device() returns true (despite it is int) if the task is executed at a host device. You increment num_gpus if the function returns 0 (false), and then at line 49 you say that offloading is possible if the num_gpus > 0 .
• The condition at line 48 is the same as the condition at the following line, so there is a dead code.

I hope you get my point.

When executing your test application omp_is_initial_device() always returns 0. ldd confirms, that the binary is linked with the libraries from the GCC (GCC-10.2.0 or GCC-7.3.0 + CUDA/10.2.89) I have compiled (libstdc++.so, libgomp.so, libgcc_s.so). Do you have an idea could be wrong?

Thank you.
Ondra