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192 GB memcached server

Posted by Sagi Bashari 
Sagi Bashari
192 GB memcached server
September 13, 2010 11:20PM
Hi,

We are considering buying a memcached server with 192 GB of RAM.

Up to now the maximal amount of RAM we used for a single memcached
server was 48 GB, so this is a big jump.

I couldn't find previous experience reports about such big memcached
instances. Is there any technical downside to using one such instance
with so much RAM instead of splitting it across a few smaller servers?
(redundancy is not an issue, we will have multiple servers anyway).

Another question: does RAM speed make any noticeable performance
difference, e.g. 800Mhz vs. 1333Mhz?

Regards,
Sagi
Patrick Galbraith
Re: 192 GB memcached server
September 14, 2010 12:02AM
Sagi Bashari wrote:
> Hi,
>
> We are considering buying a memcached server with 192 GB of RAM.
>
> Up to now the maximal amount of RAM we used for a single memcached
> server was 48 GB, so this is a big jump.
>
> I couldn't find previous experience reports about such big memcached
> instances. Is there any technical downside to using one such instance
> with so much RAM instead of splitting it across a few smaller servers?
> (redundancy is not an issue, we will have multiple servers anyway).
>
Sagi,

If you have multiple servers anyway, then I don't see a downside.
> Another question: does RAM speed make any noticeable performance
> difference, e.g. 800Mhz vs. 1333Mhz?
>
Network, in my experience, is the big determinant. I haven't ever tested
the difference with regard to CPU speed, so I can't say for certain.
Since memcached isn't a big CPU-intensive app, that isn't something that
is usually an issue.

regards,

Patrick
> Regards,
> Sagi
>
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