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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. |
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Note, this page is outdated
Introduction
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]