Fling Study

Overview

The Fling study is a set of broadband platform simulations defined by PG&E and PEER researchers and run by SCEC Broadband platform group. Full specification of the Fling study will be posted when available.

Certification of USC HPCC Cluster for Broadband Calculations

The verification and validation of the currently released Broadband platform is based on results generated on a SCEC server called broadband.usc.edu. When we move the Broadband platform software, re-build it, and re-run it in a different computing environment, the results the platform produces can be slightly different than results produced on the SCEC server. Differences can come from computing hardware, from operating system characteristics, from compiler version, and other sources.

Before accepting results generated in a new computing environment, we must first certify that the new computing environment produces results that are equivalent to the results from the original server where the platform was originally developed and tested.

To speed up execution of the Fling study, we plan to run it on the USC HPCC cluster, so we must certify that USC HPCC cluster results are valid and comparable to those generated on broadband.usc.edu.

Here are results from our initial certification tests. A researcher ran a small subset of the Fling study on the SCEC broadband server. Then, we ran the same subset on the USC HPCC cluster. Below we compare the output seismograms from both runs, showing that the two results are very similar.

In our discussions, we decided that the certification criteria for this study will include a number of small magnitude ruptures, and a number of large magnitude ruptures, which we will post when they are available.

Comparison of Seismogram from Server and Cluster

Simulation	broadband.usc.edu	USC HPCC cluster
10010116
10010129