carns

Changelog:

• Kevin Harms: bug fix for segfault in apps that use MPI_Init_thread()

Darshan 1.1.6 is now available on the download page.

Changelog:

• Limit PMPI usage in library to fewer functions
• Update PMPI detection in compiler scripts to ignore functions unused by Darshan

This release is now available on the download page.

Changelog:

• Track files opened via Parallel NetCDF
• Track files opened via HDF5
• Record slowest individual POSIX read and write times along with access size for those operations
• Inspect symbols at compile time to determine whether to enable Darshan or not based on the presence of MPI and PMPI symbols
• Use GNU and IBM compilers from path rather than hard coded location
• Simplify warning message if unable to open log file
• Remove unused internal benchmark routines

This release is now available on the download page.  Note that the output files generated by Darshan 1.1.4 are not compatible with the output files generated by 1.1.3.

Changelog:

• Updated compiler scripts for V1R4 driver on BlueGene/P

This release is now available on the download page.

Changelog:

• Added *_r versions for each IBM compiler script on BlueGene/P

This release is now available on the download page.

Changelog:

• Set default permissions to 0400 (user read only) for output files
• Automatically disable Darshan at link time if common PMPI libraries are detected in the command line
• Experimental tool (darshan-gen-cc.pl) to automatically generate Darshan-enabled mpicc scripts

This release is now available on the download page.

The Darshan svn repository is now available for public read-only access. See the download page for details.

Here is the IASDS workshop presentation from September 4, 2009.

Phil Carns will be presenting a paper entitled 24/7 Characterization of Petascale I/O Workloads at the inaugural Workshop on Interfaces and Architectures for Scientific Data Storage.  The event will be held on Friday, September 4th in New Orleans in conjunction with Cluster 2009.

This is the home page for  Darshan, a scalable HPC I/O characterization tool. Darshan is designed to capture an accurate picture of application I/O behavior, including properties such as patterns of access within files, with minimum overhead.  The name is taken from a Sanskrit word for “sight” or “vision”.
Darshan can be used to investigate and tune the I/O behavior of complex HPC applications.  In addition, Darshan’s lightweight design makes it suitable for full time deployment for workload characterization of large systems.  We hope that such studies will help the storage research community to better serve the needs of scientific computing.
Darshan was originally developed on IBM Blue Gene series computers at the Argonne Leadership Computing Facility, but today it is portable across a wide variety of platforms and is deployed in production at computing facilities around the world.
You will find current news about the Darshan project posted below.   Additional documentation and details about the Darshan are available from the links at the top of this page.