On 12/04/2013 07:32 AM, Stefan Kaltenbrunner wrote:


On 12/04/2013 04:30 PM, Peter Eisentraut wrote:
On 12/4/13, 2:14 AM, Stefan Kaltenbrunner wrote:
running a
few kvm instances that get bootstrapped automatically is something that
is a solved problem.

Is it sound to run performance tests on kvm?

as sounds as on any other platform imho, the performance characteristics
will differ between bare metal or other virtualisation platforms but the
future is virtual and that is what a lot of stuff runs on...

In actuality you need both. We need to know what the kernel is going to do on bare metal. For example, 3.2 to 3.8 are total crap for random IO access. We will only catch that properly from bare metal tests or at least, we will only catch it easily on bare metal tests.

If we know the standard bare metal tests are working then the next step up would be to test virtual.

BTW: Virtualization is only one future and it is still a long way off from serving the needs that bare metal serves at the same level (speaking PostgreSQL specifically).

JD




Stefan




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