## OpenMP Trace

Nsight Systems is capable of capturing information about OpenMP events. This functionality is built on the OpenMP Tools Interface (OMPT), full support is available only for OpenMP 5.0 or greater.

As an example, if you use PGI compiler 20.1 with LLVM OpenMP runtime to build your OpenMP applications, add -mp=libomp switch to enable OMPT based tracing.

Only a subset of OpenMP events are traced. These are limited to the following:

>     ompt_callback_parallel_begin
>     ompt_callback_parallel_end
>     ompt_callback_sync_region
>     ompt_callback_task_create
>     ompt_callback_task_schedule
>     ompt_callback_implicit_task
>     ompt_callback_master
>     ompt_callback_reduction
>     ompt_callback_task_create
>     ompt_callback_cancel
>     ompt_callback_mutex_acquire, ompt_callback_mutex_acquired
>     ompt_callback_mutex_acquired, ompt_callback_mutex_released
>     ompt_callback_mutex_released
>     ompt_callback_work
>     ompt_callback_dispatch
>     ompt_callback_flush

Note: These raw OMPT events are processed and reorganized by Nsight Systems to be more user-friendly. You may not see exact same events from the list.

Example screenshot:

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