Re: Unexpected low CPU usage

> 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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