Cylictest not identifying isolated cores

[Chaser]

I have been running cyclic test to measure latency across different CPU cores.

On two devices I have 12 Core and 4 core when isolcpus is applied cyclic test does not run on this cores. However, it does so on another device with 6 cores.

Some information:
Setup:

• 12 core / 4 cores isolated
• 4 core / 2 cores isolated

nproc identified the following:

• 12 core - nproc = 8 / nproc --all =12
• 4 core - nproc = 2 / nproc --all = 4

Execution arguments on both devices
cyclictest -l100000000 --mlockall -S -p90 -i200 -h2000 --quiet > $LATENCY_FILE

OS: Ubuntu 22.04.2 LTS
Kernel - 5.15.0-82-lowlatency
rt-tests version: 2.2-1

[olm52]

I have a similar problem. If I isolate some cores with cpuset, cyclictest will show only the cores not isolated.