| Limiting CPU resources to a VE? [message #35060] |
Tue, 24 February 2009 17:28  |
Ubuntu
Messages: 1
Registered: February 2009
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Junior Member |
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Hello
I've searched this forum, I've searched Google, and I can't find a way of limiting the CPU resources available to a VE.
I am in the process of benchmarking native vs. Xen vs. OpenVZ on an Opteron system with 8 cores.
What I want to do is to limit the CPU power in the VE to 2 cores. Doesn't matter which ones.
I have tried this:
vzctl set 101 --save --cpulimit 200
(has no effect)
vzctl set 101 --save --cpus=2
(again has no effect)
When I say it does not work, when I run a benchmark in the VE I am getting the same performance I would if I run it natively on the system with all 8 cores available. i.e. it is running too fast, proving that I am not limited to the power of 2 cores.
My benchmark is multi-core aware.
How do I limit the CPUs in the VE to the equivalent of 2 processor cores?
When I start the VE I get this:
Setting CPU limit: 0
Setting CPU units: 1000
Setting CPUs: 2
However, in the VE, when I have a look at /cat/proc/cpuinfo there are 8 processors there. And as I say, I'm getting performance associated with the native machine.
I'm using Ubuntu 8.04 for the OpenVZ host, kernel is 2.6.24.
Thanks
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