trace-mpi

For message passing interface (MPI) analysis , configure collectors to determine MPI rank ID in case of a non-Intel MPI library implementation.

Syntax

-trace-mpi | -no-trace-mpi

Default

-no-trace-mpi

Actions Modified

Description

Based on the

PMI_RANK

PMI_ID

MPI analysis environment variable (whichever is set), the

VTune

Profiler

extends a process name with the captured rank number that is helpful to differentiate ranks in a

VTune

Profiler

result with multiple ranks. The process naming schema in this case is <process_name>
(rank <N>
). Use the

-trace-mpi

option to enable detecting an MPI rank ID for MPI implementations that do not provide the environment variable.

Examples

This command runs the Hotspots analysis type (hardware event-based sampling mode) with enabled MPI rank ID detection.

mpirun -n 4 vtune -result-dir my_result -trace-mpi -collect hotspots -knob sampling-mode=hw -- ./test.x

In This Topic

Performance varies by use, configuration and other factors. Learn more at www.Intel.com/PerformanceIndex.