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Source - http://www.soa-world.de/echelon/
Huge Social Network Visualization with Walrus 6 This two images show one of the largest graphs I created: 413193 nodes and 1247702 links with a tree depth of four. The left images only shows the spanning tree and the image on the right shows the entire network. When working with such large networks I encountered a couple of problems. I was using PHP to create the Walrus graph file. Because of the spanning tree this is no trivial task and it became very clear that PHP is the wrong tool for it. A PHP script ran for about 4 hours to create a 30000 node graph file. I wanted bigger trees so I ported the PHP script to C++ and was surprised to find that the same task took mere seconds. This is not due to inefficient coding but PHP definitely has problems when dealing with huge junks of data especially when they are stored in associative arrays. In C++ I used hash_maps which worked out perfectly.