[httperf] Why are responses limited to number of connections

Marcus Clyne eugaia at gmail.com
Mon Feb 23 16:13:55 PST 2009


Thanks for your reply Mark,

Yes, I'm trying to do 10000 requests on 1 connection.  I think the 
problem is that I've not properly implemented TCP keepalive on my server 
yet.

Cheers,

Marcus.


Mark Nottingham wrote:
> You're asking httperf to make 10,000 requests on one connection 
> (--num-conns is *total* connections).
>
> From the look of it, your server is closing that connection after the 
> first request...
>
> Cheers,
>
>
> On 24/02/2009, at 3:02 AM, Marcus Clyne wrote:
>
>> Hi,
>>
>> I've written a small custom-built HTTP server using libev.  I've 
>> tested it out using ab with the command
>>
>> ab -n 10000 http://localhost:8002/url
>>
>> and things work fine.  All 10k responses are returned with 2xx codes.
>>
>> However, if I do
>>
>> httperf --server=localhost --uri=/url --port=8002 --num-calls=10000
>>
>> I get the following response:
>>
>> httperf --client=0/1 --server=localhost --port=8002 --uri=/url 
>> --send-buffer=4096 --recv-buffer=16384 --num-conns=1 --num-calls=10000
>> Maximum connect burst length: 0
>>
>> Total: connections 1 requests 2 replies 1 test-duration 0.003 s
>>
>> Connection rate: 310.1 conn/s (3.2 ms/conn, <=1 concurrent connections)
>> Connection time [ms]: min 3.2 avg 3.2 max 3.2 median 3.5 stddev 0.0
>> Connection time [ms]: connect 0.2
>> Connection length [replies/conn]: 1.000
>>
>> Request rate: 620.2 req/s (1.6 ms/req)
>> Request size [B]: 63.0
>>
>> Reply rate [replies/s]: min 0.0 avg 0.0 max 0.0 stddev 0.0 (0 samples)
>> Reply time [ms]: response 2.5 transfer 0.5
>> Reply size [B]: header 142.0 content 335.0 footer 0.0 (total 477.0)
>> Reply status: 1xx=0 2xx=1 3xx=0 4xx=0 5xx=0
>>
>> CPU time [s]: user 0.00 system 0.00 (user 0.0% system 124.0% total 
>> 124.0%)
>> Net I/O: 182.6 KB/s (1.5*106 bps)
>>
>> Errors: total 1 client-timo 0 socket-timo 0 connrefused 0 connreset 1
>> Errors: fd-unavail 0 addrunavail 0 ftab-full 0 other 0
>>
>>
>> Moreover, if I change the number of connections (e.g. --num-conns=5) 
>> the 2xx reply statuses show that number of responses.
>>
>> I'm not quite sure what is happening, and what needs to be changed in 
>> my source code to get HTTPerf working properly.
>>
>> Can anyone help, please?  Thanks in advance.
>>
>> Marcus.
>>
>>
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>
> -- 
> Mark Nottingham       mnot at yahoo-inc.com
>
>
>



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