core-performance-openmp
Measure the performance of individual cores with OpenMP.
Science Score: 54.0%
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Measure the performance of individual cores with OpenMP.
Basic Info
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Metadata Files
README.md
Measure the performance of individual cores with OpenMP.
You can use this program to measure the performance of individual CPU cores of a system. It works by running a pleasingly parallel workload on each core and measuring the time it takes to complete. The workload is a simple loop that find the sum of all the elements of an array (1 billion 64-bit floating point numbers by default). The program is written in C++ and uses OpenMP to parallelize the workload. To prevent the operating system from moving threads between cores, the program uses the OpenMP affinity API to pin each thread to a specific core.
[!NOTE] You can just copy
main.shto your system and run it. \ For the code, refer tomain.cxx.
```bash $ ./main.sh
OMPNUMTHREADS=64
{run=000, thread=000, node=0, core=000, time=2407.0969ms, flops=4.1544e+08}
{run=000, thread=001, node=0, core=032, time=2407.0779ms, flops=4.1544e+08}
{run=000, thread=002, node=1, core=001, time=2407.0649ms, flops=4.1544e+08}
...
```
I run this program on nodes 1, 2, and 4 of our cluster - no core-specific faults are present.
Also below is runtime stabilisation plot (I perform 100 runs of summing a billion elements on each core).
References
- OpenMP topic: Affinity - Parallel Programming for Science Engineering: The Art of HPC, volume 2 by Victor Eijkhout
- c - Openmp. How to retrieve the core id in which a thread is running - Stack Overflow
- c++ - OpenMP and CPU affinity - Stack Overflow
- c++ - Set CPU affinity when create a thread - Stack Overflow
- Controlling OpenMP Thread Affinity
- Thread Affinity Interface
- OpenMP Application Program Interface Version 3.1
- Embarrassingly parallel - Wikipedia
Owner
- Name: puzzlef
- Login: puzzlef
- Kind: organization
- Website: https://puzzlef.github.io/
- Repositories: 10
- Profile: https://github.com/puzzlef
A summary of experiments.
Citation (CITATION.cff)
cff-version: 1.2.0
message: "If you use this software, please cite it as below."
authors:
- family-names: Sahu
given-names: Subhajit
orcid: https://orcid.org/0000-0001-5140-6578
title: "puzzlef/core-performance-openmp: Measure the performance of individual cores with OpenMP"
version: 1.0.0
doi: 10.5281/zenodo.10208367
date-released: 2023-11-27
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| Name | Commits | |
|---|---|---|
| Subhajit Sahu | w****7@g****m | 9 |
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