[contestms] Re: CMS in the cloud
- From: Artem Iglikov <artem.iglikov@xxxxxxxxx>
- To: contestms@xxxxxxxxxxxxx
- Date: Fri, 28 Mar 2014 23:33:49 +0600
I'm not an expert too, and I also understand possible "fight for the
resources" between VMs. I really thought that testing results would be
awful. But, probably because I use so-called 'Compute-optimized' instances
(see description here: http://aws.amazon.com/ec2/instance-types/), testing
results are pretty stable. And this part of the description gives me a
large hope in their overall stability (remember, I'm not an expert,
especially in hardware): "Each virtual CPU (vCPU) on C3 instances is a
hardware hyper-thread from a 2.8 GHz Intel Xeon E5-2680v2 (Ivy Bridge)
processor".
On Fri, Mar 28, 2014 at 7:05 PM, Giovanni Mascellani <
mascellani@xxxxxxxxxxxxxxxxxxxx> wrote:
> Hi.
>
> Il 28/03/2014 08:23, Artem Iglikov ha scritto:
> > Hmm. Today I restarted all workers simultaneously, and they performed
> > equally. Probably, first time worker1 was running some unnecessary
> > service that I forgot to shutdown.
>
> I'm not an expert on this, but I understand that EC2 machines are
> virtual machines that share their CPU with other virtual machines. Thus,
> depending on the load of the "companions" instances, they may perform
> better or worse (I would say that Amazon guarantees for a minimum
> performance, not for a maximum one).
>
> But, again, I'm not expert of this field.
>
> Giovanni.
> --
> Giovanni Mascellani <giovanni.mascellani@xxxxxx>
> PhD Student - Scuola Normale Superiore, Pisa, Italy
>
> http://poisson.phc.unipi.it/~mascellani
>
>
--
Artem Iglikov
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