Re: Unexpected low CPU usage

It's great that you have foudn an issue. You should run the test with  
perfmon logging to a file every few seconds, with the top ten metrics  
(see teh gui for these), and with netstat -a piped to a text file. In  
Linux or Solaris sar will give you the same data.


On Jan 21, 2008, at 3:21 PM, Johan Stuyts wrote:

>> What happened to the throughput when you enabled keep-alive?
>
> I investigated a bit more and here is the whole story.
>
> Apache XML-RPC does not use Commons HttpClient by default, but  
> instead it
> uses the Sun HTTP implementation. Keep-alive is enabled and does *not*
> cause performance problems.
>
> When I switched to the transport factory that uses Commons HttpClient
> which is included with Apache XML-RPC. This led to the problems with  
> too
> many ports in the 'TIME_WAIT' state. I looked in the code and saw an
> HttpClient was created for each request.
>
> I wrote a transport factory that uses a single HttpClient with a
> MultiThreadedConnectionManager for all requests. HttpClient by default
> uses keep-alive too. The performance of XML-RPC dropped and CPU usage
> became much lower.
>
> I am determining how easy it is to switch XFire to the Sun HTTP
> implementation. If it is not easy I will see if switching to CXF  
> helps. I
> have to switch anyway some time in the future as further development  
> will
> be done at CXF.
>
> Note that I still used a single client with a single thread for all  
> three
> configurations above.
>
> Johan Stuyts
>
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