Anyone? On 23 Apr 2011, at 11:50, Bayard Bell wrote:
> I've got an OpenSolaris guest that I'm using as a compile server, with Mac OS > X Server as the host. I've assigned 4 CPUs to the guest, and the guest in > fact sees 4 CPUs. From the host perspective, however, what I see is that the > guest never ranges substantially above 200% (or 2 CPU) utilisation, even when > the run queue is backed up and 4 processes appear to be on the CPU. I'm > comparing the compile times to reference against other configurations, and > what I'm seeing in VirtualBox leads me to believe that I'm being presented 4 > CPUs but can't actually consume more than 2. I haven't made any > apples-to-apples comparison yet, but this nevertheless seems to be able to > keep the system running under load that can't be sustained with only 2 CPUs > assigned, which seems to indicate that the benefits of assigning more than 2 > CPUs may be more about reducing context switching and CPU migration overhead > on the guest than providing the full benefit of increased compute resources > (or: IOW words the benefit seems equivalent to provide hyperthreaded virtual > CPUs rather than cores). > > Is this expected behaviour? I've looked through the documentation and wasn't > able to find any information on this. I'm running 4.0.6 and also saw this > behaviour on 4.0.4.
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