Re: Regarding maximing the performance

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

Hi Sajal,

On Wed, May 26, 2010 at 11:52 AM, SAJAL BHATIA <s.b...@qu...> wrote:

>   Hi,
>
> I want to run a test against a web server (nginx) with traffic coming from
> maximum possible clients , each with different IP address. I am running the
> Curl Loader on a physical machine with 2 dual core processors (i.e. 4
> cores), and 8 GB of memory. The machine has 2 gigabit Ethernet cards. I
> was just wondering how to make the most efficient utilization of these
> resources. I have come up with a couple of options and would need some help
> in choosing the most appropriate to get the maximum performance.
>
>    1. Use the entire resources together and run the curl loader scripts
>    with -t 4 and total number of clients to be somewhere around 150 K.
>    Considering each client consumes around 40 KB of memory, the theoreticalmaximum will be (8*1024*1024) / 40 somewhere around 210 K. But since we do
>    need some spare memory, hence we choose approx 150 K.
>
>
1. Looks good with exception that I have doubts regarding VM usage.

2. Ensure that you know how to configure ngnix to support for 150K
connections.
    By default it is 1024.

    Note, that for each IP address you have 64K ports.

    Ensure, that ngnix machine can withstand such load.
    All the above questions are to ngnix mailing list.



>
>    1.
>    2. Divide the resources into different parts using virtualization
>    and run one instance of curl loader on each Virtual Machine. For example.
>    have two virtual machines each with one dual core CPU (dedicated/reserved)
>    and 4 GB of memory (dedicated/reserved), and run one instance of curl loader
>    on each with -t 2 and number of clients to be approximately 75 K on each
>    machine.
>
> First option I recon would only use one Ethernet card, but the second
> option would.
>
>
>
Also good, but see the previous option.


> I also want to have a heavy load in terms of data rate or packets per
> second so what should be the appropriate values for TIME_URL_COMPLETIONand TIME_AFTER_URL_SLEEP.
>
>

Depends on your servers power, file size, etc
Play with it.

>
>
> Awaiting for the response.
>
>
>
> Thanks and Regards
>
>
>  ----
> Sajal Bhatia
> Research Masters Student
> QUT, Brisbane
> AUSTRALIA
>
>
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>
>
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>


-- 
Truly,
Robert Iakobashvili, Ph.D.
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