SC is the International Conference for
 High Performnance Computing, Networking, Storage and Analysis

SCHEDULE: NOV 13-19, 2010

I/O Strategies for Massively Parallel Kinetic Simulations

SESSION: Research Poster Reception


TIME: 5:15PM - 7:00PM

AUTHOR(S):Homa Karimabadi, Burlen Loring, Amitava Mujumdar, Mahidar Tetenani

ROOM:Main Lobby

We have recently performed the largest 3D global magnetosphere hybrid simulation to date using 98,304 cores on NSF’s XT5 supercomputer Kraken. The unprecedented simulations have been instrumental in revealing new science which has now been confirmed in spacecraft data. This work highlights the challenges of running simulations at large core counts. One significant issue is the large I/O requirements for particle based codes. Particle codes can produce more than 200TB in a single run and will soon scale to 10s of PBs. We present Lustre tuned optimizations that resulted in a factor of 8 speed up in our IO kernel, making our unprecedented simulation possible. We present a scaling study and investigation of Lustre specific tuning for POSIX, independent MPI-IO and collective MPI-IO making use of the new Lustre specific lock protocol based file domain partitioning scheme implemented in Cray MPT.

Chair/Author Details:

Homa Karimabadi - University of California, San Diego

Burlen Loring - University of California, San Diego

Amitava Mujumdar - San Diego Supercomputer Center

Mahidar Tetenani - San Diego Supercomputer Center

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