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

Copyright © 2012 Intel Corporation. All Rights Reserved.

Base Compiler Invocation

C benchmarks

C++ benchmarks


Fortran benchmarks

Benchmarks using both Fortran and C

Base Portability Flags





Base Optimization Flags

C benchmarks

C++ benchmarks


Fortran benchmarks

Benchmarks using both Fortran and C

Peak Optimization Flags

C benchmarks



C++ benchmarks


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

This result has been formatted using multiple flags files. The "platform settings" from each of them appears next.

Platform settings from AMD_flags

SPEC MPI2007 Flag Description for AMD

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.


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


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)


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.

Platform settings from Lenovo_Platform_Flags


Machine Configurations

BIOS settings

Maximum Performance

Maximizes performance and minimizes latency with little regard to power consumption.

SMT Mode

Can be used to disable symmetric multithreading. To re-enable SMT, a POWER CYCLE is needed after selecting the 'Auto' option. WARNING - S3 is NOT SUPPORTED on systems where SMT is disabled.

NUMA node per socket

Specifies the number of desired NUMA nodes per socket. Zero will attempt to interleave the two sockets together.

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 files that were used to format this result can be browsed at,

You can also download the XML flags sources by saving the following links:,

For questions about the meanings of these flags, please contact the tester.
For other inquiries, please contact
Copyright 2006-2010 Standard Performance Evaluation Corporation
Tested with SPEC MPI2007 v2.0.1.
Report generated on Mon Mar 15 11:03:04 2021 by SPEC MPI2007 flags formatter v1445.