[libmicrohttpd] performance (again)

[Taehwan Weon]

Hi,

Thanks for your kindful comment.

My test (stress) environment was

     - tool : tsung (with about 5 linux boxes to generate load)

     - concurrent usrers: 10,000 GET operations (target url objects are 1,000 10KBs)

The reason why I use the completion callback was to make access log compatible with apache format.

In libmicrohttpd manual, I could not find a proper API. 

In normal operation, I used MHD_create_response_from_callback(). 

Although I can add my completion callback to it, some responses had to be made from MHD_create_response_from_buffer().

In these cases, I could not add my completion callback to it.

That's why I used the MHD completion callback.

After a little optimization, my caching proxy can handle up to 10,000~20,000 GETs/sec (without keep-alive) in 2 xeon CPU (8 cores)

In the next phase, I'm going to measure elapsed times in the connection handling of libmicrohttpd.

If you have any comments, I will be highly appreciate for that.

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weon