wrk is a modern HTTP benchmarking tool capable of generating significant load when run on a single multi-core CPU. It combines a multithreaded design with scalable event notification systems such as epoll and kqueue. An optional LuaJIT script can perform HTTP request generation, response processing, and custom reporting. Details are available in SCRIPTING and several examples are located in scripts/.

wrk is a modern HTTP benchmarking tool capable of generating significant load when run on a single multi-core CPU. It combines a multithreaded design with scalable event notification systems such as epoll and kqueue .An optional LuaJIT script can perform HTTP request generation, response processing, and custom reporting. Details are available in SCRIPTING and several examples are located in scripts/.

wrk - Modern HTTP benchmarking tool

Siege is an open source regression test and benchmark utility. It can stress test a single URL with a user defined number of simulated users, or it can read many URLs into memory and stress them simultaneously. The program reports the total number of hits recorded, bytes transferred, response time, concurrency, and return status. Siege supports HTTP/1.0 and 1.1 protocols, the GET and POST directives, cookies, transaction logging, and basic authentication. Its features are configurable on a per user basis.
 
Most features are configurable with command line options which also include default values to minimize the complexity of the program's invocation. Siege allows you to stress a web server with n number of users t number of times, where n and t are defined by the user. It records the duration time of the test as well as the duration of each single transaction. It reports the number of transactions, elapsed time, bytes transferred, response time, transaction rate, concurrency and the number of times the server responded OK, that is status code 200.

Siege is an open source regression test and benchmark utility. It can stress test a single URL with a user defined number of simulated users, or it can read many URLs into memory and stress them simultaneously. The program reports the total number of hits recorded, bytes transferred, response time, concurrency, and return status. Siege supports HTTP/1.0 and 1.1 protocols, the GET and POST directives, cookies, transaction logging, and basic authentication. Its features are configurable on a per user basis.

Siege - Http load tester and benchmarking utility

Apache JMeter may be used to test performance both on static and dynamic resources (files, Servlets, Perl scripts, Java Objects, Data Bases and Queries, FTP Servers and more). It can be used to simulate a heavy load on a server, network or object to test its strength or to analyze overall performance under different load types. You can use it to make a graphical analysis of performance or to test your server/script/object behavior under heavy concurrent load.

Apache JMeter - Pure Java application for load and functional testing

ali is a load testing tool capable of performing real-time analysis, inspired by vegeta and jplot. It comes with an embedded terminal-based UI where you can plot the metrics in real-time, so lets you perform real-time analysis on the terminal.

ali - Generate HTTP load and plot the results in real-time

ab is a tool for benchmarking your Apache Hypertext Transfer Protocol (HTTP) server. It is designed to give you an impression of how your current Apache installation performs. This especially shows you how many requests per second your Apache installation is capable of serving.

Apache Bench - Apache HTTP server benchmarking tool

Fortio (Φορτίο) started as, and is, Istio's load testing tool and now graduated to be its own project. Fortio runs at a specified query per second (qps) and records an histogram of execution time and calculates percentiles (e.g. p99 ie the response time such as 99% of the requests take less than that number (in seconds, SI unit)). It can run for a set duration, for a fixed number of calls, or until interrupted (at a constant target QPS, or max speed/load per connection/thread).
 
Fortio also includes a set of server side features (similar to httpbin) to help debugging and testing: request echo back including headers, adding latency or error codes with a probability distribution, tcp echoing, tcp proxying, http fan out/scatter and gather proxy server, GRPC echo/health in addition to http, etc.

Fortio (Φορτίο) started as, and is, Istio's load testing tool and now graduated to be its own project. Fortio runs at a specified query per second (qps) and records an histogram of execution time and calculates percentiles (e.g. p99 ie the response time such as 99% of the requests take less than that number (in seconds, SI unit)). It can run for a set duration, for a fixed number of calls, or until interrupted (at a constant target QPS, or max speed/load per connection/thread).

Fortio - Load testing library, command line tool, advanced echo server and web UI in Go

NoSQLBench is a serious performance testing tool for the NoSQL ecosystem. It brings together features and capabilities that are not found in any other tool. It can run common testing workloads directly from the command line. It can generate virtual data sets of arbitrary size, with deterministic data and statistically shaped values.
 
It is designed for custom workloads that emulate your application, contained in a single file, based on statement templates - no IDE or coding required.

NoSQLBench is a serious performance testing tool for the NoSQL ecosystem. It brings together features and capabilities that are not found in any other tool. It can run common testing workloads directly from the command line. It can generate virtual data sets of arbitrary size, with deterministic data and statistically shaped values.
    

NoSQLBench - The open source, pluggable, nosql benchmarking suite

GoBench is a HTTP/HTTPS load testing and benchmarking tool. Its requests hits and requests rate are 5X better than other testing tools.  

GoBench - HTTP/HTTPS load testing and benchmarking tool

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