Hi I am currently doing some load testing of a NIO TCP/IP based Server: - Server and Client (MINA based) on same machine. - PC: P4, 3GHz, 1GB RAM, Windows XP, SP2
I seem to always reach a limit on the number of connections to the Server (not sending any messages), i.e. using a single client making multiple connection requests, after a few 1000 connections (Task Manager: 130k Handles), I get the[code][/code] following exception: ... java.io.IOException: Failed to get the session. at .... Caused by: java.net.SocketException: No buffer space available (maximum connections reached?): connect at sun.nio.ch.Net.connect(Native Method) ..... I have tried the following, (with little or no success): - Changing some of the registry settings, e.g. TCPNumConnections, MaxUserPort. (No effect) - Using Heap buffers (No effect) - Using the compiler options (CPU usage went from 100% to 75%): -Xmn 100M -Xms -500M -Xmx 500M Will using a non-NIO Client help? Is this problem Win XP O.S. specific. Does Win XP place a limit on the number of: - Simultaneous TCP connections - File Handles/Descriptors - Socket buffer size If the problem is O.S. related: - Can any of the above parameters be changed, e.g. Registry settings - What would the best OS for a Server, e.g. Windows Server 2000/2003, or Linux (which version: Redhat, Fedora, Debian)? Does PC's processor speed/RAM have any effect, i.e. will 300MHz, 128 MB be as good as 1GHz, 1GB RAM? Many Thanks, Matt
