## OpenACC Trace

Nsight Systems is capable of capturing information about OpenACC execution in the profiled process.

OpenACC versions 2.0, 2.5, and 2.6 are supported when using PGI runtime version 15.7 or later. In order to differentiate constructs (see tooltip below), a PGI runtime of 16.0 or later is required. Note that Nsight Systems does not support the GCC implementation of OpenACC at this time.

Under the CPU rows in the timeline tree, each thread that uses OpenACC will show OpenACC trace information. You can click on a OpenACC API call to see correlation with the underlying CUDA API calls (highlighted in teal):

If the OpenACC API results in GPU work, that will also be highlighted:

Hovering over a particular OpenACC construct will bring up a tooltip with details about that construct:

To capture OpenACC information from the Nsight Systems GUI,select the Collect OpenACC trace checkbox under Collect CUDA trace configurations. Note that turning on OpenACC tracing will also turn on CUDA tracing.

Please note that if your application crashes before all collected OpenACC trace data has been copied out, some or all data might be lost and not present in the report.

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