I'm using clang 9.0.0 to compile a code which offloads sections of a
code on a GPU using the openmp target construct.
I also use the nowait clause to overlap the execution of certain kernels
and/or host<->device memory transfers.
However, using the nvidia profiler I've noticed that when I compile the
code with clang only one cuda stream is active,
and therefore the execution gets serialized. On the other hand, when
compiling with XLC I see that kernels are executed
on different streams. I could not understand if this is the expected
behavior (e.g. the nowait clause is currently not supported),
or if I'm missing something. I'm using a NVIDIA Tesla P100 GPU and
compiling with the following options: