MPI2007 Flag Description
Intel Corporation Atlantis (Intel Xeon X5482, 3.20 GHz)

Copyright © 2009 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

126.lammps


Base Optimization Flags

C benchmarks

C++ benchmarks

126.lammps

Fortran benchmarks

Benchmarks using both Fortran and C


Peak Optimization Flags

C benchmarks

122.tachyon

125.RAxML

142.dmilc

C++ benchmarks

126.lammps

Fortran benchmarks

129.tera_tf

137.lu

143.dleslie

145.lGemsFDTD

Benchmarks using both Fortran and C

121.pop2

128.GAPgeofem

132.zeusmp2

147.l2wrf2


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

Intel(R) MPI Library 3.2.2 for Linux* options and environment variables

Job startup command flags

-n <# of processes> or -np <# of processes>

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

-perhost <# 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.

--parallel-startup

Use this option to allow parallel fast starting of mpd daemons under one local root. No daemon checking is performed.

-genv <ENVVAR> <value>

Use this option to set the <ENVVAR> environment variable to the specified <value> for all MPI processes.

Environment variables

I_MPI_DEVICE=<device>[:<provider>]

Select the particular network fabric to be used.

sock - Sockets

shm - Shared-memory only (no sockets)

ssm - Combined sockets + shared memory (for clusters with SMP nodes)

rdma - RDMA-capable network fabrics including InfiniBand*, Myrinet* (via DAPL*)

rdssm - Combined sockets + shared memory + DAPL* (for clusters with SMP nodes and RDMA-capable network fabrics)

I_MPI_FALLBACK_DEVICE=(enable|disable)

Set this environment variable to enable fallback to the available fabric. It is valid only for rdssm and rdma modes.

Fall back to the shared memory and/or socket fabrics if initialization of the DAPL* fabric fails. This is the default value.

Terminate the job if the fabric selected by the I_MPI_DEVICE environment variable cannot be initialized.


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/EM64T_Intel111_flags.20100202.html.

You can also download the XML flags source by saving the following link:
http://www.spec.org/mpi2007/flags/EM64T_Intel111_flags.20100202.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 v85.
Report generated on Tue Jul 22 13:39:21 2014 by SPEC MPI2007 flags formatter v1445.