Apache benchmark: always a few "super late" requests, why ?

[B.R.]

Why do wish so much that comes from Nginx?
I would have a look on the network table (listening and connection
sockets), on the load of the network, system (processes) suring the tests.

But you said nothing of all that, just sending raw ab tests results which
say pretty much nothing about anything...

---
*B. R.*


On Sat, May 4, 2013 at 10:09 PM, henrique matias <hems.inlet at gmail.com>wrote:

> Perhaps no matter if i change number of workers, or worker connections,
> there's always some super late connections on my "ab" tests..
>
> Am very new to benchmark, but the way am doing now is:
>
> ab -n 8000 -c 1000 http://address_to_a_plain_text_file
>
> ab -n 8000 -c 1000
> http://address_to_a_rails_address_that_queries_the_database
>
> Almost all tests i do ends up with very good results up to 90% of the
> requests ( both, with plain text and with rails script ), but then
> sometimes in this last 10% there's very slow requests ( 10x more than the
> fastest )..
>
> For instance : ab -n 8000 -c 1000 http://address_to_a_plain_text_file
>
> Percentage of the requests served within a certain time (ms)
>   50%    142
>   66%    152
>   75%    156
>   80%    158
>   90%    169
>   95%    181
>   98%   4180
>   99%   5236
>  100%   5485 (longest request)
>
> The ones that goes to the database sometimes get very slow compared to
> plain text files, so am guessing i should enlarge somehow the pipe betweens
> rails and the db.
>
> For instance : ab -n 8000 -c 1000 http://address_to_rails_touching_db_file
>
> Percentage of the requests served within a certain time (ms)
>   50%     10
>   66%     10
>   75%     10
>   80%     11
>   90%     12
>   95%     13
>   98%     16
>   99%     25
>  100%  13237 (longest request)
>
>
> Even my plain text files are suffering, so i would guess that is a problem
> in my worker_process / worker_connections and keepalive_timeout ?
>
>
> And for the file that touchs the database i would guess i should be
> tweaking some database configuration between my rails and mongodb...
>
>
> Any advices?
>
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