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.

Fling Study Scenario List

scenario_id	magnitude	dip	rake	Ztor	fault_length	fault_width		Priority
								
101	6	90	180	0	14	8		1
102	6.5	90	180	0	24	13		
103	7	90	180	0	68	15		
104	7.5	90	180	0	210	15		
105	7.8	90	180	0	420	15		
106	8.2	90	180	0	470	15		
								
107	6	70	180	0	14	8		2
108	6.5	70	180	0	24	13		
109	7	70	180	0	68	15		
110	7.5	70	180	0	210	15		
111	7.8	70	180	0	420	15		
112	8.2	70	180	0	470	15		
								
113	6	70	180	0	14	8		3
114	6.5	70	180	0	24	13		
115	7	70	180	0	40	25		
116	7.5	70	180	0	100	32		
117	7.8	70	180	0	160	40		
118	8.2	70	180	0	400	40		
								
119	6	90	180	0	14	8		4
120	6.5	90	180	0	24	13		
121	7	90	180	0	40	25		
122	7.5	90	180	0	100	32		
123	7.8	90	180	0	160	40		
124	8.2	90	180	0	400	40		
								
125	6	45	90	0	10	10		5
126	6	45	90	5	10	10		
127	6.5	45	90	0	18	18		
128	6.5	45	90	5	18	18		
129	7	45	90	0	44	23		
130	7.5	45	90	0	126	25		
131	7.8	45	90	0	180	25		
								
132	6	60	90	0	10	10		
133	6	60	90	5	10	10		
134	6.5	60	90	0	18	18		
135	6.5	60	90	5	18	18		
136	7	60	90	0	50	20		
137	7.5	60	90	0	150	20		
138	7.8	60	90	0	200	20

139	7.0	45	90	0	18	18
140	6.5	45	90	0	18	18
141	6.5	45	90	5	18	18
142	7.0	45	90	0	44	23
		

Notes

Engineers have put together a set of fling simulations to submit to the BB Platform as shown in the list above.

Scenarios 140, 141 and 142 were identified as high priority simulations at a NGA-West2 meeting last Friday.

Running on USC HPCC

A sample set of simulations from the Fling study were run on USC HPCC. The original fling generation scripts, source descriptions, station lists, and batch scripts were copied over from broadband.usc.edu to /home/rcf-104. Then small modifications were made to update paths and block the actual execution of the platform (the platform will be run in a PBS job):

Sample scripts can be found at the following locations:

Script	Location	Description	Modified
build_xml.py	/auto/rcf-104/patrices/bbp/batch_tools	Builds XML workflows for a simulation	No
batch_run_bbp.py	/auto/rcf-104/patrices/bbp/batch_tools	Executes BBP workflow	Modified to only write BBP command-lines for simulations to a log for later execution by run_parallel.py. BBP invocations are saved in batch_run_bbp_sims.log and bbp output directory moves are saved in batch_run_bbp_moves.log
run_parallel.py	/auto/rcf-104/patrices/bbp/batch_tools	Helper script to run N programs on a set of M cores	New script
gen_source_input.csh	/auto/rcf-104/patrices/bbp/fling	Generate full study inputs	No
run_bbp-parallel.csh	/auto/rcf-104/patrices/bbp/fling	Originally intended to execute the study with the platform. After modifications, only generates XML and execution lists for run_parallel.py.	Some paths changed, also added ${ROOT_PATH} to some relative path locations to make them absolute paths

General steps for running the Fling study:

• Generate inputs

$ ./gen_source_input.csh

• Generate XML workflows

$ ./run_bbp-parallel.csh

• Create PBS job submission script (example below)
• Submit PBS job to USC HPCC

Example PBS script running the sample Fling simulations on 16 cores:

#!/bin/bash

#PBS -q nbns
#PBS -l arch=x86_64,pmem=2000mb,pvmem=3000mb,walltime=6:00:00,nodes=4:ppn=4
#PBS -V
#PBS -e /home/rcf-104/patrices/bbp/fling/Xml1/Set1/run_set1.err
#PBS -o /home/rcf-104/patrices/bbp/fling/Xml1/Set1/run_set1.out

PYTHONPATH=/home/rcf-104/patrices/bbp/11.2.2/bbp_2g/comps

HOME=/home/rcf-104/patrices/bbp/fling

echo "Jobs start"
date

cd $HOME

python $HOME/Xml1/Set1/run_parallel.py /home/rcf-104/patrices/bbp/11.2.2/setup_bbp_env.sh $HOME
/Xml1/Set1/batch_run_bbp_sims.log $PBS_NODEFILE 1

python $HOME/Xml1/Set1/run_parallel.py /home/rcf-104/patrices/bbp/11.2.2/setup_bbp_env.sh $HOME
/Xml1/Set1/batch_run_bbp_moves.log $PBS_NODEFILE 1

echo "Jobs end"
date

Comparison of Seismogram from Server and Cluster

Simulation	broadband.usc.edu	USC HPCC cluster
10010116
10010129

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.

Below are initial 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.