High CPU load when using memStress

[phamquiluan]

I am trying to stress the memory without affecting CPU usage.

In the Chao-mesh document, it says:

To avoid the high CPU load caused by the read and write pressure from stress-ng, Chaos Mesh uses memStress to simulate memory stress. This is because memStress simulates memory stress by consuming actual memory instead of applying the read and write pressure to memory.

https://chaos-mesh.org/docs/simulate-heavy-stress-on-kubernetes/#cpustressor

But I see it doesn't do what it should do. The CPU usage is high when stressing memory.

The command I used

memStress --size 100MiB --workers 1

Screenshot: You can see that the CPU usage spike from 5% to 45% of a CPU

Q: Is there any way to reduce the CPU usage while stressing memory?

Thank a lot!