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Darshan
Note: This page is in progress.
| Darshan is a set of libraries that can characterize MPI-IO and POSIX file access within typical HPC applications in a nonintrusive way. It can be used to investigate I/O behavior of a MPI-program. |
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Introduction
Darshan is developed by Mathematics and Computer Science Division of Argonne National Laboratory to allow investigation and tuning of the I/O behaviour of complex HPC applications. It is open-source and available on github. Many Tutorials and hands-on excercises are available online.
Usage
Darshan can be used with compile time wrappers or by dynamic library preloading. For detailed description, see 'Darshan-runtime installation and usage'.
Running program with Darshan instrumentation on Hawk using module
In Hawks module environment Darshan version 3.1.7 is available. If you need a different version you can install it in your home directory and follow the description mentioned above.
The easiest way to instrument your application is to preload the darshan library during runtime. You have to make sure your application is dynamically linked with the MPI library. If you are not sure if it is dynamically linked, type
If it shows the MPI library, your application is dynamically linked.
libmpi.so => /opt/hpe/hpc/mpt/mpt-2.23/lib/libmpi.so (0x00007f5d32b33000)
Load the needed software module,
create directory to store Darshan logfile. It should have the folder structure year/month/day.
Export logpath environment variable,
run your application with preloaded darshan library.
You will get a darshan logfile in the previously created directory. Its name will have your username, your application name and a bunch of numbers in it and go with the ending .darshan.