Do I need --parallel-kernels option for multi-kernel on multi-device scenario?

[mabdallah89]

Hello,

I am using concurrent kernel execution on multi-GPU system using multi-stream (see code example below). Example:

for(i = 0; i < GPU_N; i++)  
{
....
//Set device
hipSetDevice(i);
launch_addKernel(&A_d[start], &B_d[start], &C_d[start], size, 1, 1, streams[i]);
....
}

I want to collect some performance statistics while these kernels are running concurrently with rocprof. Do I still have to use --parallel-kernels option to ensure concurrent kernel execution?

command with --parallel-kernels

rocprof --parallel-kernels -i in-prof2.txt -o ./output.csv ./vector_add

I believe in this case the kernels will be running concurrently even without "--parallel-kernels" since each kernel run on a separate device. Am I correct? I believe --parallel-kernels is needed when concurrent kernels are running on a single device to avoid serialization. But, in case of, multi-device, it should support concurrent kernels by default since each kernel launched on a sperate device.

If the answer is NO, and I have to use "--parallel-kernels" in case of multi-device, then I have a runtime error when I run on multi-GPU MI210. The error is:

Memory access fault by GPU node-6 (Agent handle: 0xec22d0) on address 0x14ab000. Reason: Unknown.
/usr/bin/rocprof: line 297: 788934 Aborted                 (core dumped)

Any help, please?

[ppanchad-amd]

@mabdallah89 Apologies for the lack of response. Do you still need assistance with this issue? Thanks!

[ppanchad-amd]

@mabdallah89 No longer requires assistance on this ticket and agrees to close the ticket. Thanks!