Apache ab Alternatives

Callgrind is a profiling tool and KCachegrind is able to visualize output of the profilers.

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.

PnP networked resource monitoring tool that can help to answer the what just happened to kill our performance

VisualVM is a visual tool integrating several commandline JDK tools and lightweight profiling...

Oink is a Rails plugin and log parser to help narrow down the source(s) of increased memory usage in rails applications.

Robot Console is a Message and Event Monitoring Software for IBM i thathas automatic message management, resource monitoring, and log monitoring.

OProfile is an open source project that includes a statistical profiler, capable of profiling all running code at low overhead.

An open source load testing tool written in Python.

MemoryLogic offers tools to add process id and memory usage in rails logs and to track memory leaks.

weighttp is a lightweight and small benchmarking tool for web servers.

dotMemory allows users to analyze memory usage in a variety of .NET and .NET Core applications.

HTTP benchmarking tool capable of generating significant load on a multi-core CPU.

Valgrind is an instrumentation framework for building dynamic analysis tools.