MPI2007 Flag Description
Lenovo Global Technology ThinkSystem SR665 (AMD EPYC 7763, 2.45 GHz)

Copyright © 2012 Intel Corporation. All Rights Reserved.


Compiler Invocation

C benchmarks

C++ benchmarks

126.lammps

Fortran benchmarks

Benchmarks using both Fortran and C


Base Portability Flags

121.pop2

126.lammps

127.wrf2


Peak Portability Flags

121.pop2

126.lammps

127.wrf2


Base Optimization Flags

C benchmarks

C++ benchmarks

126.lammps

Fortran benchmarks

Benchmarks using both Fortran and C


Peak Optimization Flags

C benchmarks

104.milc

122.tachyon

C++ benchmarks

126.lammps

Fortran benchmarks

107.leslie3d

113.GemsFDTD

129.tera_tf

137.lu

Benchmarks using both Fortran and C

115.fds4

121.pop2

127.wrf2

128.GAPgeofem

130.socorro

132.zeusmp2


System and Other Tuning Information

Intel(R) MPI Library 4.0.3 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/AMD_flags.20210315.html.

You can also download the XML flags source by saving the following link:
http://www.spec.org/mpi2007/flags/AMD_flags.20210315.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 v2.0.1.
Report generated on Mon Mar 15 11:03:11 2021 by SPEC MPI2007 flags formatter v1445.