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From Deepak Goel <deic...@gmail.com>
Subject Re: Complete difference in results when scaling across multiple boxes
Date Fri, 17 Feb 2012 18:20:33 GMT
Hey

I guess the web server takes the extra time to ascertain connections
from 3 machines vis-a-vis 1 machine...

:)
Deepak

On 2/17/12, Robin D. Wilson <rwilson2@gmail.com> wrote:
> Just out of curiosity, in your Win7 systems, did you change the
> "MAXCONNECTIONSPERSERVER" and "MAXCONNECTIONSPER1_0SERVER" settings
> in the registry?
>
> My experience has been that on all Windows systems - this setting throttles
> the number simultaneous out-bound connections you can
> make to the same server. I've increased mine to allow 'java.exe' and
> 'javaw.exe' to go up to 2048 simultaneous connections - and
> that does seem to make a difference in JMeter behavior. But I can't actually
> quantify whether it allows all 2048 connections, or if
> there is some Windows imposed 'hard limit' at 48 or something...
>
> --
> Robin D. Wilson
> Sr. Director of Web Development
> KingsIsle Entertainment, Inc.
> VOICE: 512-777-1861
> www.KingsIsle.com
>
>
> -----Original Message-----
> From: James Carr [mailto:JamesCarr@carfax.com]
> Sent: Thursday, February 16, 2012 2:02 PM
> To: JMeter Users List
> Subject: Complete difference in results when scaling across multiple boxes
>
> Hi All,
>
>
>
> I ran these tests several times, and each time I come back with the similar
> results. I really don't get it. I am using JDBC sampler
> with max connections set to 30 for running across 3 machines and 90 when
> running on one machine. Here's the results:
>
>
> 30 Threads x 3 Machines for 2 minutes
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
> Number of Samples: 176,912
>
> Average Response: 62
>
> Std. Deviation: 436.46%
>
>
> 90 Threads x 1 Machine for 2 minutes
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
> Number of Samples: 912,954
>
> Average Response: 11
>
> Std. Deviation: 34.14%
>
>
>
>
>
> Machine Specs:
>
> RAM: 8GB
>
> Processor: Intel Core i7 CPU     870 @ 2.93Ghz
>
> System Type: 64-bit Windows 7
>
>
>
> Any idea why I see this huge discrepancy? I have double checked on our
> database on the server side and I verified that we do have
> the number of connections we expect to see, but I can't understand why the
> performance looks so lousy with multiple machines.
>
>
>
>
>
>
> Thanks,
> James
>
>
>
>
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>


-- 
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   --
Keigu

Deepak
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deicool@gmail.com
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