[httperf] Why are responses limited to number of connections

Mark Nottingham mnot at yahoo-inc.com
Mon Feb 23 15:49:24 PST 2009


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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