Oink - Oink is a Rails plugin and log parser to help narrow down the source(s) of increased memory usage in rails applications.
Valgrind - Valgrind is an instrumentation framework for building dynamic analysis tools.
Apache ab - Apache ab is a tool for benchmarking Apache Hypertext Transfer Protocol (HTTP) server.
OProfile - OProfile is an open source project that includes a statistical profiler, capable of profiling all running code at low overhead.
JProfiler - JProfiler is the leading Java Profiler for profiling on the JVM. JProfiler's intuitive UI helps you resolve performance bottlenecks, pin down memory leaks and understand threading issues.
VisualVM - VisualVM is a visual tool integrating several commandline JDK tools and lightweight profiling...