[Xen-devel] Max vcpus per vm and xend memory?

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Subject:	[Xen-devel] Max vcpus per vm and xend memory?
From:	Thomas Graves <tgraves@xxxxxxxxxxxxx>
Date:	Fri, 18 Jun 2010 11:15:28 -0700
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Thread-topic:	Max vcpus per vm and xend memory?

Hello,

So I was wondering if there is a way to dynamically get the max vcpus a vm
can support? I'm running xen3.4.2 and xen3.3.1 and I know the number is 32
but I was wondering if there is a dynamic way to get that number?

Along those lines I noticed that if you tried to allocate something silly
like 65000 vcpus to a vm xend's memory usage goes way up and from what I can
tell doesn't ever release it (atleast no time soon).    This seems to be
memory from the cpus array in the config information:
'cpus': [[], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [],
[], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [],
[], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [],
[], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [],
[], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [],
[], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [],
[], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [],
[], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [],
[], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [],
[], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [],
[], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [],
[], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [],
[], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [],
[], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [],
[], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [],
[], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [],
[], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [],
[], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [],
[], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [],
[], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [],
[], [], [], [], [], [], [], [], [], [], [], [],....]

I'm not very familiar with python but from what I read python seems to keep
around like 80 lists around in case it needs them again and am wondering if
that is the case here (any python experts) or if perhaps xend accidentally
holding on to it?

Thanks,
Tom


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[Xen-devel] Max vcpus per vm and xend memory?