The Valgrind distribution currently includes six production-quality tools: a memory error detector, two thread error detectors, a cache and branch-prediction profiler, a call-graph generating cache profiler, and a heap profiler. It also includes two experimental tools: a heap/stack/global array overrun detector, and a SimPoint basic block vector generator. It runs on the following platforms: X86/Linux, AMD64/Linux, PPC32/Linux, PPC64/Linux, and X86/Darwin (Mac OS X). 

Valgrind uses dynamic binary instrumentation, so you don't need to modify, recompile or relink your applications. Just prefix your command line with valgrind and everything works. Valgrind works with programs written in any language, be they compiled, just-in-time compiled, or interpreted. The Valgrind tools are largely aimed at programs written in C and C++, because programs written in these languages tend to have the most bugs! But it can, for example, be used to debug and profile systems written in a mixture of languages. Valgrind has been used on programs written partly or entirely in C, C++, Java, Perl, Python, assembly code, Fortran, Ada, and many others.

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.

Valgrind

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. It uses various binary rewriting techniques to insert hooks into the running Ruby process, allowing you to collect data without having to run a patched Ruby installation. Currently, memprof provides data about object allocation, garbage collection, and full dumps of the Ruby heap. <A HREF="http://memprof.com/" target="_blank">http://memprof.com/</A> is a hosted service to analyze dumps and it will be free during beta period.

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.

Memprof - A Ruby gem for memory profiling

ruby-prof is a fast code profiler for Ruby. Its features include:

 <ul>
 <li>Speed - it is a C extension and therefore many times faster than the
 standard Ruby profiler. 
 </li>
 <li>Modes - Ruby prof can measure a number of different parameters, including call times, memory usage and object allocations.
 </li>
 <li>Reports - can generate text and cross-referenced html reports
 <ul>
 <li>Flat Profiles - similar to the reports generated by the standard Ruby
 profiler
 </li>
 <li>Graph profiles - similar to GProf, these show how long a method runs, which
 methods call it and which methods it calls.
 </li>
 <li>Call tree profiles - outputs results in the calltree format suitable for
 the KCacheGrind profiling tool.
 </li>
 </ul>
 </li>
 <li>Threads - supports profiling multiple threads simultaneously
 </li>
 <li>Recursive calls - supports profiling recursive method calls
 </li>
 </ul>

ruby-prof is a fast code profiler for Ruby.

Ruby-Prof - fast code profiler for Ruby

A Ruby library for finding memory leaks. Its features include:
 <UL>
	<LI>leak-proof C instrumentation</LI>
	<LI>minimal impact on runtime performance</LI>
	<LI>fast analysis step</LI>
	<LI>tracks all objects allocated on the heap, including internal types like T_NODE</LI>
	<LI>easy integration into any program, not just Rails</LI>
 </UL>

BleakHouse - Ruby library to find memory leaks

Alleyoop is a graphical front-end to the increasingly popular Valgrind memory checker for the x86 and x86_64 flavors of Linux using the Gtk+ widget set and other GNOME libraries for the X-Windows environment. Features include a right-click context menu to intelligently suppress errors or launch an editor on the source file/jumping to the exact line of the error condition. A searchbar at the top of the viewer can be used to limit the viewable errors to those that match the regex criteria entered. Also included is a fully functional Suppressions editor

Alleyoop is a graphical front-end to the increasingly popular Valgrind memory checker for the x86 and x86_64 flavors of Linux using the Gtk+ widget set and other GNOME libraries for the X-Windows environment.

Alleyoop

The MemcheckView GUI uses the Tool Gear viewer to display and organize Memcheck's output in a way that makes it much easier to examine the most-critical Memcheck warnings first. MemcheckView also displays the relevant source code for each warning and the source code can be viewed for the entire call chain, if desired. The MemcheckView package includes scripts (memcheck_all, memcheck) that provide an easy way to run Memcheck on parallel (MPI) and serial applications. Because Memcheck generates its output file on the fly while the application is running, the MemcheckView tool can monitor this output file and update the display continually. MemcheckView can also read a completed output file after the monitored application has exited.

MemcheckView is a GUI front end for Valgrind's Memcheck tool, which can detect a comprehensive set of memory errors, including reads and writes of unallocated or freed memory, reads of unitialized memory, and memory leaks.

MemcheckView

Valkyrie is an open-source graphical user interface for the Valgrind 3.3.X line. Valkyrie uses the Qt widget library, and is based on Valgrind`s XML output capabilities. Valkyrie is designed for simplicity and ease of use, whilst allowing access to the full range of Valgrind command-line options. Currently, Valkyrie supports Memcheck only, although work is in progress to handle Cachegrind and Massif. Also included in Valkyrie is an auxiliary tool which can read XML outputs from multiple Valgrind (Memcheck) runs, merge them together into a single XML file, and optionally display the merged result in the GUI.

Valkyrie is an open-source graphical user interface for the Valgrind 3.3.X line. Valkyrie uses the Qt widget library, and is based on Valgrind`s XML output capabilities. Valkyrie is designed for simplicity and ease of use, whilst allowing access to the full range of Valgrind command-line options.

Valkyrie

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.

Adds in proccess id and memory usage in your rails logs, great for tracking down memory leaks.

Memorylogic - Memory usage logger

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