https://github.com/rigtorp/c2clat

A tool to measure CPU core to core latency
https://github.com/rigtorp/c2clat

benchmark cpu latency

Last synced: 8 months ago
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A tool to measure CPU core to core latency

• Host: GitHub
• URL: https://github.com/rigtorp/c2clat
• Owner: rigtorp
• License: mit
• Created: 2020-10-09T03:16:51.000Z (over 5 years ago)
• Default Branch: master
• Last Pushed: 2023-03-06T01:57:49.000Z (over 3 years ago)
• Last Synced: 2025-03-24T00:31:28.505Z (about 1 year ago)
• Topics: benchmark, cpu, latency
• Language: C++
• Homepage:
• Size: 13.7 KB
• Stars: 146
• Watchers: 5
• Forks: 24
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

Awesome Lists containing this project

README

          
# c2clat

A tool to measure CPU core to core latency (inter-core latency).

Build:

```console

g++ -O3 -DNDEBUG c2clat.cpp -o c2clat -pthread

```

Example usage:

```console

$ ./c2clat 

 CPU    0    1    2    3    4    5    6    7

   0    0   92   66   62   16   56   54   53

   1   92    0   50   54   53   14   49   50

   2   66   50    0   48   51   49   13   48

   3   62   54   48    0   53   50   48   13

   4   16   53   51   53    0   53   51   53

   5   56   14   49   50   53    0   49   50

   6   54   49   13   48   51   49    0   48

   7   53   50   48   13   53   50   48    0

```

Create plot using [gnuplot](http://gnuplot.sourceforge.net/):

```console

c2clat -p | gnuplot -p

```

![Plot of inter-core latency](https://github.com/rigtorp/c2clat/blob/master/c2clat.png)

If you want to run on a subset of cores use [taskset](https://www.man7.org/linux/man-pages/man1/taskset.1.html):

```console

$ taskset -c 10-11 ./c2clat

 CPU   10   11

  10    0   52

  11   52    0

```

If you want to label the heatmap plot replace the plot command with:

```gnuplot

plot '$data' matrix rowheaders columnheaders using 2:1:3 with image, \

     '$data' matrix rowheaders columnheaders using 2:1:(sprintf("%g",$3)) with labels

```