MpiP

The mpiP library is a light-weight profiling library for MPI applications. To record an MPI profile, simply run the program with the mpiP library preloaded.

Developer: LLNL Platforms: Hazel Hen Category: Performance Analyzer License: BSD Website: mpiP homepage

Note, this page is outdated

Usage

First load the related software module

module load mpip

which will set the '$HLRS_MPIP_ROOT' variable to the latest mpiP installation path.

The tools mpiP needs to be _attached_ to you application through the "LD_PRELOAD" mechanism. On Hawk in most cases it is sufficient to use the provided wrapper script as

mpirun $HLRS_MPIP_ROOT/../share/trace-mpiP.sh <your_app and options>

This will create one or two files with file extension `.mpiP` in the folder. Those files include a consice performance report (`*.1.mpiP`) and an extensive performance report (`*.2.mpiP`), respectively.

The behaviour of mpiP is controlled by options provided via the `MPIP` environment variable. See the mpiP documentation for a detailed description of all options. The wrapper on Hawk already sets sensible defaults. But you may override those by exporting your own config as

export MPIP="CONFIG HERE"; mpirun $HLRS_MPIP_ROOT/../share/trace-mpiP.sh <your_app and options>

or copy the wrapper script and adapt it to your needs if necessary.

Hints

Fortran codes that use the mpi constants `MPI_IN_PLACE` and `MPI_BOTTOM` might experience unexpected behavior with mpiP [1]

See also

• Software Development Tools, Compilers & Libraries

External Links

• mpiP homepage