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Asked: 2026-05-20T06:23:42+00:00

searching for answers for why my kernels produce strange error messages or 0 only

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searching for answers for why my kernels produce strange error messages or “0” only results I found this answer on SO that mentions that there is a timeout of 5s for kernels running on nvidia gpus? I googled for the timout but I could not find confirming sources or more information.

What do you know about it?

Could the timout cause strange behaviour for kernels with a long runtime?

Thanks!

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1 Answer

  1. Editorial Team

    Further googling brought up this in the CUDA_Toolkit_Release_Notes_Linux.txt (Known Issus):

    # Individual GPU program launches are limited to a run time of less than 5 seconds on a GPU with a display attached. Exceeding this time limit usually causes a launch failure reported through the CUDA driver or the CUDA runtime. GPUs without a display attached are not subject to the 5 second runtime restriction. For this reason it is recommended that CUDA be run on a GPU that is NOT attached to a display and does not have the Windows desktop extended onto it. In this case, the system must contain at least one NVIDIA GPU that serves as the primary graphics adapter.

    [update] It seems that the official name for this feature is ‘watchdog’.

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