MPI2007 Flag Description
Lenovo Global Technology ThinkSystem SR665 (AMD EPYC 7H12, 2.6 GHz)
Copyright © 2012 Intel Corporation. All Rights Reserved.
Base Optimization Flags
-
-
- -flto
![[user]](http://www.spec.org/auto/mpi2007/flags/user.png)
- OPTIMIZE
-
Generate output files in LLVM formats, suitable for link time optimization.
When used with -S this generates LLVM intermediate language assembly files,
otherwise this generates LLVM bitcode format object files
(which may be passed to the linker depending on the stage selection options).
-
- -ffast-math
- OPTIMIZE
-
Enables a range of optimizations that provide faster,
though sometimes less precise, mathematical operations that may not conform to the IEEE-754 specifications.
When this option is specified, __STDC_IEC_559__ macro is ignored even if set by the system headers
-
- -march=znver2
- OPTIMIZE
-
Specify that Clang should generate code for a specific processor family member and later.
For example, if you specify -march=znver2,
the compiler is allowed to generate instructions that are valid on AMD Zen2 processors,
but which may not exist on earlier products.
-
-
-
- -flto
- OPTIMIZE
-
Generate output files in LLVM formats, suitable for link time optimization.
When used with -S this generates LLVM intermediate language assembly files,
otherwise this generates LLVM bitcode format object files
(which may be passed to the linker depending on the stage selection options).
-
- -ffast-math
- OPTIMIZE
-
Enables a range of optimizations that provide faster,
though sometimes less precise, mathematical operations that may not conform to the IEEE-754 specifications.
When this option is specified, __STDC_IEC_559__ macro is ignored even if set by the system headers
-
- -march=znver2
- OPTIMIZE
-
Specify that Clang should generate code for a specific processor family member and later.
For example, if you specify -march=znver2,
the compiler is allowed to generate instructions that are valid on AMD Zen2 processors,
but which may not exist on earlier products.
-
-
-
- -flto
- OPTIMIZE
-
Generate output files in LLVM formats, suitable for link time optimization.
When used with -S this generates LLVM intermediate language assembly files,
otherwise this generates LLVM bitcode format object files
(which may be passed to the linker depending on the stage selection options).
-
- -ffast-math
- OPTIMIZE
-
Enables a range of optimizations that provide faster,
though sometimes less precise, mathematical operations that may not conform to the IEEE-754 specifications.
When this option is specified, __STDC_IEC_559__ macro is ignored even if set by the system headers
-
- -march=znver2
- OPTIMIZE
-
Specify that Clang should generate code for a specific processor family member and later.
For example, if you specify -march=znver2,
the compiler is allowed to generate instructions that are valid on AMD Zen2 processors,
but which may not exist on earlier products.
-
-
-
- -flto
- OPTIMIZE
-
Generate output files in LLVM formats, suitable for link time optimization.
When used with -S this generates LLVM intermediate language assembly files,
otherwise this generates LLVM bitcode format object files
(which may be passed to the linker depending on the stage selection options).
-
- -ffast-math
- OPTIMIZE
-
Enables a range of optimizations that provide faster,
though sometimes less precise, mathematical operations that may not conform to the IEEE-754 specifications.
When this option is specified, __STDC_IEC_559__ macro is ignored even if set by the system headers
-
- -march=znver2
- OPTIMIZE
-
Specify that Clang should generate code for a specific processor family member and later.
For example, if you specify -march=znver2,
the compiler is allowed to generate instructions that are valid on AMD Zen2 processors,
but which may not exist on earlier products.
-
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.
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 Wed May 6 11:57:34 2020 by SPEC MPI2007 flags formatter v1445.
![[benchmark]](http://www.spec.org/auto/mpi2007/flags/benchmark.png)
![[suite]](http://www.spec.org/auto/mpi2007/flags/suite.png)