OMP2012 Flag Description
IBM IBM S822LC for HPC (Power8 with NVLink, 2.860 GHz)

Test sponsored by Indiana University

Base Compiler Invocation

C benchmarks

C++ benchmarks

Fortran benchmarks

Base Portability Flags



Base Optimization Flags

C benchmarks

C++ benchmarks

Fortran benchmarks

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.

Shell, Environment, and Other Software Settings

Specify stack size to be allocated for each thread.
For loops running with OpenMP schedule "static", this results in (#iterations/#threads) iterations--rounded to the next lower integer--being allocated to most threads, with at most one additional iteration being allocated to some threads. Although the largest number of iterations assigned to any thread remains the same, this results in a more even sharing of iterations between threads, which may sometimes lead to a performance improvement relative to the default static thread distribution.
Currently has no effect. Typically enables (TRUE) or disables (FALSE) the dynamic adjustment of the number of threads.
Enables (TRUE) or disables (FALSE) nested parallelism.
Set stack size to unlimited
The command "ulimit -s unlimited" is used to set the stack size limit to unlimited.

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

You can also download the XML flags source by saving the following link:

For questions about the meanings of these flags, please contact the tester.
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Copyright 2012-2018 Standard Performance Evaluation Corporation
Tested with SPEC OMP2012 v1.1.
Report generated on Wed Jun 20 15:26:34 2018 by SPEC OMP2012 flags formatter v538.