MPI2007 Flag Description
QLogic, Intel, Supermicro QDR Benchmark Cluster (QLogic TrueScale InfiniBand, Intel Xeon X5570, 2.93 GHz)

Test sponsored by QLogic Corporation

Copyright © 2006 Intel Corporation. All Rights Reserved.


Base Compiler Invocation

C benchmarks

C++ benchmarks

126.lammps

Fortran benchmarks

Benchmarks using both Fortran and C


Base Portability Flags

121.pop2

127.wrf2


Base Optimization Flags

C benchmarks

C++ benchmarks

126.lammps

Fortran benchmarks

Benchmarks using both Fortran and C


Implicitly Included Flags

This section contains descriptions of flags that were included implicitly by other flags, but which do not have a permanent home at SPEC.


System and Other Tuning Information

Platform settings

One or more of the following settings may have been set. If so, the "General Notes" section of the report will say so; and you can read below to find out more about what these settings mean.

Hardware Prefetch:

This BIOS option allows the enabling/disabling of a processor mechanism to prefetch data into the cache according to a pattern-recognition algorithm.

In some cases, setting this option to Disabled may improve performance. Users should only disable this option after performing application benchmarking to verify improved performance in their environment.

Adjacent Sector Prefetch:

This BIOS option allows the enabling/disabling of a processor mechanism to fetch the adjacent cache line within an 128-byte sector that contains the data needed due to a cache line miss.

In some cases, setting this option to Disabled may improve performance. Users should only disable this option after performing application benchmarking to verify improved performance in their environment.

Snoop Filter Enabled/Disabled:

This BIOS option enables/disables the Snoop Filter. The Snoop Filter is designed to reduce system bus utilization coming from cache misses. On the Intel 5000X and 5400 chipset, it is built as a cache structure able to minimize unnecessary snoop traffic. When enabled, it can lead to significant memory performance improvements for several workstation applications on suitable memory configurations.

ulimit -s

Sets the stack size to n kbytes, or unlimited to allow the stack size to grow without limit.

QLogic MPI Library v2.5 options and environment variables

The submit command shown below uses the QLogic MPI mpirun command to launch the MPI processes.

     submit=  
     . $[I_ENV_HOME]/iccvars.sh intel64
     . $[I_ENV_HOME]/ifortvars.sh intel64
     mpirun -disable-mpi-progress-check -m %{hosts} -np $ranks $command
     EOF
     

The SPEC config file feature submit is used to launch MPI jobs. This specific submit command used QLogic MPI's mpirun command to launch the jobs. Before launching the job, variables are set appropriately for the QLogic MPI processes and the Intel Compiler runtime libraries. Flags for the mpirun command are explained below.

mpirun command flags

-disable-mpi-progress-check

Quiescence is a condition when no MPI messages are being sent or received by ANY of the node processes, or there is a lack of ping reply. QLogic MPI supports quiescence detection for gracefully terminating buggy deadlocked programs. This option disables MPI communication progress check without disabling the ping reply check.

-np <# of processes>

Use this option to set the number of MPI processes to run the current arg-set.

-ppn <# of processes>

Use this option to place the indicated number of consecutive MPI processes on every host in group round robin fashion. The number of processes to start is controlled by the option -n as usual.


Flag description origin markings:

[user] Indicates that the flag description came from the user flags file.
[suite] Indicates that the flag description came from the suite-wide flags file.
[benchmark] Indicates that the flag description came from a per-benchmark flags file.

The flags file that was used to format this result can be browsed at
http://www.spec.org/mpi2007/flags/QLogic_Core_Intel111_flags.html.

You can also download the XML flags source by saving the following link:
http://www.spec.org/mpi2007/flags/QLogic_Core_Intel111_flags.xml.


For questions about the meanings of these flags, please contact the tester.
For other inquiries, please contact webmaster@spec.org
Copyright 2006-2010 Standard Performance Evaluation Corporation
Tested with SPEC MPI2007 v1.1.
Report generated on Tue Jul 22 13:38:36 2014 by SPEC MPI2007 flags formatter v1445.