[dba-VB] Hyper-V VM oddness

jwcolby jwcolby at colbyconsulting.com
Tue Nov 22 21:05:24 CST 2011

I decided to try moving my VMs to Azul server, my "big" server.  I figured with 16 cores and 64 gigs 
it could handle the load.  The sole purpose of one of the VMs is to host a third party application. 
  When this app is running the VM says that the single core I assign to it is pegged, 100% 
utilization.  However none of the host machine cores shows any significant usage, and the total 
server usage bounces between 0 and 1%.

So I'm wondering what the heck is going on?  The application on the dedicated VM server was 
processing about 8-9 million records per hour on a 3.5 GHz AMD quad core, and on that host machine 
one of the cores would appear to be maxed out and the server would say 25% usage.  On the mongo 
server the CPUs are 2 GHz 8 core and no core says it is busy and I'm only getting about 4 million 
records / hour.  I expected one core to max and the total to say 1/16th total usage.

Any ideas why this VM says it is using 100% of its virtual CPU but the host server says it is not 
busy at all?

John W. Colby
Colby Consulting

Reality is what refuses to go away
when you do not believe in it

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