Qlogic Fast Fabric User Manual

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Qlogic Fast Fabric User Manual Manual pdf 34 page image

3 – Getting StartedRunning HPL3-20 D000006-000 Rev AQCreate the file with a list of the chassis names (the TCP/IP Ethernet managementport names assigned above) or IP addresses (Use of names is recommended).One entry per line. Such as:Chassis1Chassis2For further details about the file format refer to the section “Selection of Chassis”on page 5-4.3. (All) Perform a health check using: all_analysis -e. If any errors areencountered resolve the errors and rerun all_analysis -e until a clean runoccurs.4. (All) Create a cluster configuration baseline using: all_analysis -b5. (All) If desired, schedule regular runs of all_analysis via cron or othermechanisms. Consult the Linux OS documentation for more information oncron. Also consult the section “Health Check and Baselining Tools” onpage 5-69 for more information about all_analysis and its automated use.3.11Running HPLAs part of the installation process, a set of common MPI benchmarks have beeninstalled. One of the more popular measures of overall performance is HPL. Thisis the application used to rate systems on the Top 500 list. The steps allow someinitial runs of HPL to be made and provide some initial baseline numbers. Thedefaults provided should perform within 10%-20% of optimal HPL results for thecluster. Tuning for that additional 10%-20% is beyond the scope of this document.1. (Host) To run HPL, first select a configuration file appropriate to your cluster.It is best to start with a small configuration to verify HPL has been properlycompiled:a. cd /opt/iba/src/mpi_appsb. /config_hpl 2twill configure a two process test run of HPL.2. (Host) Now create the file /opt/iba/src/mpi_apps/mpi_hosts listing the hostnames of all the hosts. Depending of your selection ofVIADEV_PATH_METHOD in /opt/iba/src/mpi_apps/mpi.param.hpl the usercan specify Ethernet or IPoIB host names. The default config will allow either.3. (Host) Now run HPL:./run_hpl 2Since this is a very small problem size the performance of the run will be muchlower than the potential of the machine. So do not worry about performance,just whether or not the run was successful.