A tool to measure CPU core to core latency (inter-core latency).
Build:
g++ -O3 -DNDEBUG c2clat.cpp -o c2clat -pthreadExample usage:
$ ./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 0Create plot using gnuplot:
c2clat -p | gnuplot -p
If you want to run on a subset of cores use taskset:
$ taskset -c 10-11 ./c2clat
CPU 10 11
10 0 52
11 52 0If you want to label the heatmap plot replace the plot command with:
plot '$data' matrix rowheaders columnheaders using 2:1:3 with image, \
'$data' matrix rowheaders columnheaders using 2:1:(sprintf("%g",$3)) with labels