Ncu unable to profile application with managed memory

Developer Tools Nsight Compute
1

I have been trying to profile my application (which uses managed memory) with the following command:

ncu --replay-mode kernel --target-processes all --kernel-name kernelName-f -o ncu_profile_output ./executable

I get the following error:
==WARNING== An error was reported by the driver

==WARNING== Backing up device memory in system memory. Kernel replay might be slow. Consider using “–replay-mode application” to avoid memory save-and-restore.

==ERROR== UnknownError
==ERROR== Failed to profile “kernelNDGridIndexGlobalManage…” in process 3896305
==PROF== Trying to shutdown target application
==ERROR== The application returned an error code (9).
==ERROR== An error occurred while trying to profile.
==WARNING== No kernels were profiled.

This does not occur when I try to profile a version of the application that does not use managed memory. I believe the issue lies with the relevant metrics which I am looking for requiring multiple kernel passes to compute.
Is there a work around for this?

2

Hi, @seagol1010

Have you ever tried with “–replay-mode application” and get the same error ?
Is it possible to provide a mini repro ?

3

Hello,

I did try that and that worked! I believe that it had something to do with running out of host memory.

Thanks!