Re: Curl-loader results vary from time to time

[Robert I. <cor...@gm...>]

Hi Alo,

On Mon, Nov 3, 2008 at 8:33 PM, alo sinnathamby <asi...@ic...>wrote:

> Hi Robert,
>
> Thanks for your reply and appreciate it. I have upgraded the test
> client's RAM from 2 gig to 4 gig and now it gives me a kind of
> consistent result, though it varies a little.


Great!


> I have followed the FAQ
> sec 7.2 recommendations but that didn't make any big difference.


It means, that your system was short in memory as expected.
40K per virtual client!



> Now, i have another question: what is the best configuration for testing
> 50 000, 60 000, 70 000, 100 000 requests. Currently i am using the
> following configuration,
>

> Operating System:    CentOS release 5.2 (Final)
> CPU:    Intel(R) Core(TM)2 Duo CPU     E4600  @ 2.40GHz
> Ram:    4 Gigabytes DDR2
>
> My hosting server is:
> Linux
> Operating System:    CentOS release 5 (Final)
> CPU:    Intel(R) Core(TM)2 Quad CPU    Q6600  @ 2.40GHz
> Ram:    4 Gigabytes DDR2
>
> Please let me know the optimum and best configurations for testing
> really big loads. The reason why i am asking this question is, when i
> put CLIENTS_RAMPUP_INC=50, it takes more time but less failed. when i
> put CLIENTS_RAMPUP_INC=75, it takes less time and more failed.
> Alo
>


What was the effect of running command line with option -t 4 ?

Specifcally, I would recommend you *curl-loader - High Load HW *
as explained in the link here:
http://curl-loader.sourceforge.net/high-load-hw/index.html

So, for 100 000 req/sec better to use a dual quad-core (a single quad-core
may be not enough)
with 8 GB of checked memory.

Please, pay attention, that your OS should support above 4 GB addressing in
a single
process. We are using 64-bit Debian linux (lenny).

I would recommend -t 4 or -t 8 options, not more than 15000 clients, ramp
rate could
be 100, if more powerful CPUs used. Take care about the NEVENT parameter as
described
in *curl-loader - High Load HW
*
Best wishes!

Truly,
Robert Iakobashvili, Ph.D.
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