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What performance should I expect?

Posted by comain 
comain
What performance should I expect?
July 08, 2010 07:00AM
Hello,
I have a server that roughly have 2000 hits per second on
memcached, I have seen
about 0.06% GETs got response time higher than 10ms, is it
something expected?
dormando
Re: What performance should I expect?
July 09, 2010 08:50AM
> Hello,
> I have a server that roughly have 2000 hits per second on
> memcached, I have seen
> about 0.06% GETs got response time higher than 10ms, is it
> something expected?

http://code.google.com/p/memcached/wiki/NewPerformance

that's probably packet loss, system swapping, or your box is otherwise
overloaded. also depending on how you're measuring it your client box/etc
could be slightly broken.

-Dormando
comain chen
Re: What performance should I expect?
July 09, 2010 11:00AM
I am using pcre memcache module as the client with a apache+prefork
setup, on the client side it is also about 2000 requests per second
(i.e. 1 memcached get per request). It is roughly full loaded but I
don't think is heavy.

Memcached is deployed on another server, the problem is it is deployed
as <100 separate instances, each serve some kind of the requests.
There might be some context switch overhead and we are thinking about
merge them together next. There is no swapping.

The network should be OK because they are connected by a router with
Gigabytes bandwidth but we actually use Megabytes currently.

--
Best regrads,
Congwu



On Fri, Jul 9, 2010 at 2:43 PM, dormando <[email protected]> wrote:
>> Hello,
>>     I have a server that roughly have 2000 hits per second on
>> memcached, I have seen
>>     about 0.06% GETs got response time higher than 10ms, is it
>> something expected?
>
> http://code.google.com/p/memcached/wiki/NewPerformance
>
> that's probably packet loss, system swapping, or your box is otherwise
> overloaded. also depending on how you're measuring it your client box/etc
> could be slightly broken.
>
> -Dormando
>
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