Poor #requests/second performance

[Michael S. Fischer]

Ok, so your average latency is 16ms.  At a concurrency of 10, at most,  
you can obtain 625r/s.

(1 request/connection / 0.016s = 62.5 request/s/connection * 10  
connections = 625 request/s)

Try increasing your benchmark concurrency.

--Michael

On Jun 1, 2009, at 11:10 PM, Andreas Jung wrote:

> On 02.06.09 08:04, Poul-Henning Kamp wrote:
>> In message <4A24A75E.1030608 at zopyx.com>, Andreas Jung writes:
>>
>>
>>>> Examining varnishstat to see what happens.
>>>>
>>>>
>>> At what in particular. Looking at varnishstat does not give me a  
>>> clue
>>> about a possible problem.
>>>
>> Dropped requests. A small number is OK, a continuos growth is not.
>>
>> ("overflowed" requests are OK).
>>
>> Threads not created should be zero.
>>
> Output of varnishstat:
>
> 0+00:40:24
> diaweb04
> Hitrate ratio:       10       83       83
> Hitrate avg:     1.0000   0.9912   0.9912
>
>       50050         0.00        20.65 Client connections accepted
>       50049         0.00        20.65 Client requests received
>       50015         0.00        20.63 Cache hits
>          35         0.00         0.01 Cache misses
>          35         0.00         0.01 Backend connections success
>          28         0.00         0.01 Backend connections reuses
>          35         0.00         0.01 Backend connections recycles
>           1          .            .   N struct srcaddr
>           0          .            .   N active struct srcaddr
>          93          .            .   N struct sess_mem
>           0          .            .   N struct sess
>          17          .            .   N struct object
>          17          .            .   N struct objecthead
>          28          .            .   N struct smf
>           3          .            .   N small free smf
>           3          .            .   N large free smf
>           7          .            .   N struct vbe_conn
>           6          .            .   N struct bereq
>          12          .            .   N worker threads
>          12         0.00         0.00 N worker threads created
>          62         0.00         0.03 N overflowed work requests
>           2          .            .   N backends
>          30          .            .   N expired objects
>          55          .            .   N LRU moved objects
>       50048         0.00        20.65 Objects sent with write
>       50050         0.00        20.65 Total Sessions
>       50050         0.00        20.65 Total Requests
>          35         0.00         0.01 Total fetch
>    13213046         0.00      5450.93 Total header bytes
>   423243959         0.00    174605.59 Total body bytes
>       50050         0.00        20.65 Session herd
>
>
> and the result of 'ab':
>
> ajung at blackmoon:~> cat out.txt
> Server Software:        Unknown
> Server Hostname:        xxxxxxxx.de
> Server Port:            80
>
> Document Path:          /logo.jpg
> Document Length:        8448 bytes
>
> Concurrency Level:      10
> Time taken for tests:   81.439 seconds
> Complete requests:      50000
> Failed requests:        0
> Write errors:           0
> Total transferred:      436644839 bytes
> HTML transferred:       422400000 bytes
> Requests per second:    613.95 [#/sec] (mean)
> Time per request:       16.288 [ms] (mean)
> Time per request:       1.629 [ms] (mean, across all concurrent  
> requests)
> Transfer rate:          5235.93 [Kbytes/sec] received
>
> Connection Times (ms)
>              min  mean[+/-sd] median   max
> Connect:        0    2  35.5      1    2999
> Processing:     2   14  31.3     12    3009
> Waiting:        0   11  19.4     10    2895
> Total:          3   16  47.3     14    3015
>
> Percentage of the requests served within a certain time (ms)
>  50%     14
>  66%     16
>  75%     18
>  80%     19
>  90%     23
>  95%     26
>  98%     31
>  99%     36
> 100%   3015 (longest request)
>
> Andreas
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