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From Jonathan Ellis <jbel...@gmail.com>
Subject Re: Performance with Multiple Node Vs Single Node
Date Thu, 18 Feb 2010 18:20:07 GMT
i wouldn't worry about 10ms vs 1ms as long as throughput is still good.

are you on ec2?  have you made sure you're not seeing a latency storm?
 https://www.cloudkick.com/blog/2010/jan/12/visual-ec2-latency/

are you on 0.5.0 or later?

On Thu, Feb 18, 2010 at 10:36 AM, Richard Grossman <richiesgr@gmail.com> wrote:
> Hi,
>
> What the impact on performance to have multiple node ??
>
> The test we run here with multiple node seems a VERY bad performance
> comparing to the same amount of data located on 1 single node.
> Could you confirm or infirm such statement ?
>
> I mean if the same operation (write or read) take 5-10 times more time when
> multiple node than single node where is the problem (communication between
> computer) ??. I've read a lot about tuning of memory, disk, io, top, htop
> but nothing about networking operation between node. Is there any way to
> check what going on regarding node intercommunication ??
>
> In my case all the queries made doesn't use 3% of the CPU nor the read
> operation a lot on the disk.
> Important I'm not talking about heavy load but on single query.
>
> Thanks
>

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