| $Id$ | Latest: www.spec.org/hpg/hpc2021/Docs/ |
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Contents
This document describes known problems in SPEChpc 2021.
Do you have a problem with SPEChpc?
Try these, in this order:
SPEChpc 2021 was tested on a variety of systems prior to release, including x86, Power, and ARM Linux systems. Nevertheless, as with any software product, problems may be found too late in the testing process to be fixed in the release, or may be discovered after release.
If you discover problems that are not listed here or in the FAQ, please report them to SPEC.
About the format of this document:
Notice to maintainers: When updating this document, please do not ever re-use problem numbers.
The current list of known limitatons:
| Benchmark | Description | Work around |
|---|---|---|
| LBM | LBM may fail to validate when using larger ranks counts, usually 2-4x that of the upper tested limit for each suite. | Use fewer ranks or use a suite intended for larger rank counts. |
| miniSweep | miniSweep may not validate with odd ranks counts (except 1 or 3). | Use even rank counts |
| SOMA | SOMA uses array reductions for OpenMP and OpenACC when the compiler claims support for the standard where array reductions were added. OpenMP=>201511, OpenACC=>201811. However some compilers do not actually include support for array reductions. | Add the define flag -DSPEC_NO_VAR_ARRAY_REDUCE to use an alternate source version that does not use array reductions. Note that since the alternate version is run serially on the host, it's expected to be less performant. |
Please see the latest on-line version of this document for information on open problems and suggested workarounds.
| Benchmark | Description | Work around |
|---|---|---|
| miniSweep | miniSweep OpenMP may intermittently hang for certain compilers. | N/A |
SPEChpc™ 2021 Known Problems: Copyright © 2021 Standard Performance Evaluation Corporation (SPEC)