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From "ivan lappo (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HTTPCORE-287) HTTP.NIO Performance problems
Date Mon, 26 Dec 2011 16:44:32 GMT
HTTP.NIO Performance problems
-----------------------------

                 Key: HTTPCORE-287
                 URL: https://issues.apache.org/jira/browse/HTTPCORE-287
             Project: HttpComponents HttpCore
          Issue Type: Task
          Components: HttpCore NIO
    Affects Versions: 4.1.1, 4.1.4
            Reporter: ivan lappo


I use DefaultConnectiongIOReactor to request connection. When i receive connection i submit
http request for it. After receiving responce, i release it for new requets. I constantly
increase number of requests executed per minute
on the chart there are few params shown with discretisation 15 seconds - green - number of
requests executed, red - average responce time (between connection.requestOutput() method
and received responce, sky-blue - number of requests that failed to execute because of connection
being closed). Horisontal axis represents timeline, Left vertical axis - values of these charts.
I monitored state of my machine using mvstat and it shows for first 10 minutes 4-10 % CPU,
35-40 after. This was tested on m1.small amazon instance. With c1.medium (which has 4 times
more computation CPU power) it behaves the same, but with upper bound of 16000 requests per
15 seconds (against 5000 on weeker machine) - therefore it is not networking problem. 
What can cause such behaviour, and what can i do to improve performance? 
(http://www.freeimagehosting.net/eba15) - link to image

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