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From Rohit Karlupia <iamro...@gmail.com>
Subject Re: ATS concurrence
Date Fri, 13 Apr 2012 07:28:53 GMT
Can you verify that ATS is not going back to your servers?
Check netstat output on ATS machine?
 - You should only have connections from client to ATS.
 - Do you see connections in TIME_WAIT?  How many?

thanks!
rohitk


On Fri, Apr 13, 2012 at 12:47 PM, Jorge Román Novalbos
<jroman@linux-it.es>wrote:

> Hi,  thank for your answer!!
>
> 1) I have tried with -k too, and i have timeouts too.
>
> 2)I don't think that was the problem because I get the same timeout from
> different clients from internet. anyway I have 10G internet conexion.
>
> 3) The ATS server load is very low during the test, never overcome 1. The
> request never reach the origin servers because ATS is caching the object,
> therefore the req per seconds should be much more high.
> 4) I have the same problem with statics objects. My origin servers never
> could handle 10000 req/s, therefore I'm interesting in ATS.
> 5) Sure!
>
> I don't know, but I think it's a problem (or setting) of the SO tcp/ip
> stack.
>
> Any other idea???
>
>
> On 13/04/2012, at 08:34, Rohit Karlupia wrote:
>
> Multiple things can go wrong..;)
>
> 1) You can use -k option with ab to keep the client connections alive.
> That should be helpful.
> 2) Divide the total bytes transferred by duration of the test to see if
> you are close to bandwidth limits. (100Mbps or 1Gbps)
> 3) Are you maxing out on cpu on ATS or the application server machine? ATS
> is a proxy. It will only add to latency. If the backend server is
> exhausted, you probably need to put more servers and load balance them
> using ATS to get your desired numbers.
> 4) php is process based. What is behind ATS ? Apache? How many processes?
> 5) Are you using caching on ATS?
>
> thanks!
> rohitk
>
> On Fri, Apr 13, 2012 at 1:48 AM, Jorge Román Novalbos <jroman@linux-it.es>wrote:
>
>> Hi everyone!!
>>
>> I'm configuring a new ATS machine that it gonna server a lot request per
>> second (around 10000).
>>
>> I have done several benchmark with ab from different machine to achieve
>> more concurrence but I can't get more than 3000 request per second.
>>
>> I have set several params in order to improve the performance:
>>
>> echo "1" > /proc/sys/net/ipv4/tcp_tw_recycle
>> echo "1" > /proc/sys/net/ipv4/tcp_tw_reuse
>> echo "10" > /proc/sys/net/ipv4/tcp_fin_timeout
>>
>> echo "10240" > /proc/sys/net/core/somaxconn
>>
>> Besides, I have increased max open file allowed for nobody user to 16384
>> (User that run ATS)
>>
>> In the client side always get the same error :
>>
>> apr_socket_recv: Connection timed out (110)
>>
>> This is the ab command:
>>
>> ab -c 600 -t 60 ''http://172.20.10.11/test.php"
>>
>> I have increased the limit to 5000 in client side too.
>>
>> Anybody knows how i can retrieve more concurrence in my server??????
>>
>> Thanks in advance!!!
>>
>> Jorge
>
>
>
>

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