Re: How many threads should a kvm vm be starting?

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On September 27, 2011, Avi Kivity wrote:
> On 09/27/2011 03:29 AM, Thomas Fjellstrom wrote:
> > I just noticed something interesting, a virtual machine on one of my
> > servers seems to have 69 threads (including the main thread). Other
> > guests on the machine only have a couple threads.
> > 
> > Is this normal? or has something gone horribly wrong?
> 
> It's normal if the guest does a lot of I/O.  The thread count should go
> down when the guest idles.

Ah, that would make sense. Though it kind of defeats assigning a vm a single 
cpu/core. A single VM can now DOS an entire multi-core-cpu server. It pretty 
much pegged my dual core (with HT) server for a couple hours.

-- 
Thomas Fjellstrom
thomas@xxxxxxxxxxxxx
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