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This library help to track down memory leak. It worked very well because it adds the process id and memory usage in with EVERY single line logged and at the end of each rails request. This way, if you have a cluster, you can monitor each process and scroll through your logs and watch the memory. If it suddenly starts to jump you can look at the request and at least you have a starting point. You can checkout the code for that specific controller action and try to narrow it down.
Memprof is a Ruby level memory profiler that can help you find reference leaks in your application. Memprof can also do very lightweight function call tracing to help you figure out which system calls, and library calls your code causes. Ruby memory profiler similar to bleak_house, but without patches to the Ruby VM.
Valgrind is an award-winning instrumentation framework for building dynamic analysis tools. There are Valgrind tools that can automatically detect many memory management and threading bugs, and profile your programs in detail. You can also use Valgrind to build new tools.
A simple but effective mini-profiler for .NET and Ruby. MiniProfiler does not attach itself to every single method call; Instead, it provides An ADO.NET profiler, capable of profiling calls on raw ADO.NET, LINQ-to-SQL, EF / "Code First", Lightspeed and a range of other data access scenarios. A pragmatic Step instrumentation that you can add to code you want to explicitly profile. The profiler is also able to do database profiling and also it can log all ajax calls.
Pligg is an open source CMS (Content Management System) which provides social publishing software that encourages visitors to register on your website so that they can submit content and connect with other users. Our software creates websites where stories are created and voted on by members, not website editors. It is a user driven CMS that relies on independent authors content and participation to manage news articles.
Reddit is a web-based social bookmarking system. It allows multiple users to store, share and tag their favorite links online. Users will provide the content (links) and decide through voting what's good and what's junk. Links that receive community approval bubble up towards #1, so the front page is constantly in motion and filled with fresh and interesting links. Sub groups (community) could be created and each groups could be moderated by its owners.