Trying to explain why a VM doesn't necessarily 2 CPUs

Good Morning-

I am scheduled to meet with a few application owners who are looking for an explanation as to why we're pushing to deploy virtual machines with a processor instead of two in most cases. at least unti we can demonstrate through 2 processors are guaranteed of performance monitoring.

Can anyone provide some simple information (or links to these) that would help me to explain (and ultimately compelling) these application owners that it is really better in most cases to use a vcpu instead of two?

Thank you very much

Steve

Yes, physical machines has exclusive access to the material from the level of the program.  A Virtual Machine, ALL virtual machines share the same visor hyper.  It's a traffic COP.  Because inside a virtual machine programs do not access access the material at the level of the ESX host, they see only the CPU, which represents a slice of time.

VM must have all available resources at the same time to qualify for a slice of time, so the cycles CPU are not ready (for CPU 2 at a time) then the VM must wait.  This expectation was source of delays, delays cause performance problems.

I'm sure you can see where it's easier to schedule 1 CPU it's 2.  And this is compounded by the more VM with 2 or more CPU on an ESX host, ALL competing for the same resource with make it even worse.

It is not bad in itself, it is just as you say he has not justified that VM (especially Windows) will actually reach an advantage of 2 CPU in a virtual machine.  GOING Linux, Windows usually does not work.

Test will be to prove or disprove this.  In my tests, I can't see ANY advantage for Windows, and since produced normally intensive as Oracle and SQL using the multi-CPU would get a performance boost, and they do not increase, I see no reason to waste a CPU for a few extra CPU cycles.

If you have 1 CPU and you get 100 cycles lets say, by adding a second processor that is expected to double, right?  It should at least be important.   If I add a second vCPU in a VM and it only increased by 10 cycles, it's 10% increase.  Costs and extra CPU and stress on the ESX host is not worth a 10% bump in a virtual machine.  10 VM is duplicate of an ESX host cycles that could be used for other virtual machines, and in turn they increase only in performance by a fraction of the increase, which for me is a waste.

This is why I do not.  However, I will say that ESX 4.0 improves this a bit, so if you move your user community to ESX 4.0 will reap rewards for multi CPU.

Tags: VMware

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