How to measure GPU usage?

• For Nvidia GPUs there is a tool nvidia-smi that can show memory usage, GPU utilization and temperature of GPU.
• For Intel GPU's you can use the intel-gpu-tools.

• AMD has two options

  1. fglrx (closed source drivers):

     aticonfig --odgc --odgt
     

  2. And for mesa (open source drivers), you can use RadeonTop .

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^{Source:GPU usage monitoring}

Nvidia: to continuously update the output of nvidia-smi, you can use nvidia-smi --loop=1 (refresh interval of 1 second) or nvidia-smi --loop-ms=1000 (refresh interval of 1000 milliseconds).

   -l SEC, --loop=SEC
       Continuously  report  query data at the specified interval, rather than
       the default of  just  once.   The  application  will  sleep  in-between
       queries.   Note  that on Linux ECC error or XID error events will print
       out during the sleep period if the -x flag was not specified.  Pressing
       Ctrl+C at any time will abort the loop, which will otherwise run indef‐
       initely.  If no argument is specified for the -l form a default  inter‐
       val of 5 seconds is used.

   -lms ms, --loop-ms=ms
       Same as -l,--loop but in milliseconds.

FYI:

• How to log GPU load?
• GPU utilization is N/A when using nvidia-smi

You can use gpustat, which is a simple command-line script (wrapper for nvidia-smi) for querying and monitoring GPU status: