Newbie JEOS question

Roy Sigurd Karlsbakk roy at
Sun Feb 15 18:18:25 UTC 2009

On 14. feb.. 2009, at 21.24, Gaute Amundsen wrote:

>> I somehow doubt that virtualizing the server will help speed things
>> up. virtualization will always add overhead, and smp-guests certainly
>> imposes rather a lot of overhead. I would think the linux schedulers
>> (at least one of them) are probably better suited to run the load
>> efficiently than using separate VMs.
> We're not virtualizing on the same hardware if that's how you read  
> me. :)
> I don't know what hardware they will be running on precisely, but  
> there is a
> SAN, and redundant locations, and I presume CPUs a few years newer  
> than ours,
> so I don't worry too much. Ram usage, on the other hand, which is  
> now a major
> billable item, that is a challenge. Zope can be a real hog if you  
> let it..
> I guess we're virtualizing for mostly the same reasons as everyone  
> else:
> outsourcing hardware worries, more flexible expansion path,  
> compartmentalizing
> some services, etc. etc.

Just keep in mind that VMs requiring more than one cpu core will give  
you quite som overhead. Even vmware recommends against SMP VMs, so if  
Zope is heavy on CPU, it might be better to run it on the host rather  
than on a guest.

Roy Sigurd Karlsbakk
(+47) 98013356
roy at
I all pedagogikk er det essensielt at pensum presenteres  
intelligibelt. Det er en elementært imperativ for alle pedagoger å  
unngå eksessiv anvendelse av idiomer med fremmed opprinnelse. I de  
fleste tilfeller eksisterer adekvate og relevante synonymer på norsk.

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