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[libmicrohttpd] Performance problem under Windows

From: Martin Bisson
Subject: [libmicrohttpd] Performance problem under Windows
Date: Tue, 08 Feb 2011 11:03:10 -0500
User-agent: Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US; rv: Gecko/20101207 Thunderbird/3.1.7


I'm using libmicrohttpd Windows build (the latest I found is and I'm having some performance problems.

I wrote a simple Python script that does sequential (only one thread) HTTP POST requests in order to measure how fast a single client can make requests (sort of a measure of latency). Using a slight modification of the simple server found at running on the same computer as the Python script, I get a little more than 1 second per request. If I use the same script to send the request to an Linux Apache server on another computer on my LAN, I get around 12 ms per request.

I find the "little more than 1 second per request" a little suspicious. I looked at the code in daemon.c and both the select() and the poll() calls use a 1 second timeout... I was wondering if there might be a problem with that under Windows...? Or is the 1 second per request an expected latency for libmicrohttpd with client & server on the same computer?

Has anyone had this problem under Windows or can anyone point me to solution path?



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