Yaws (web server)

Yaws
Developer(s) Claes Wikström
Stable release
2.0.4 / 22 September 2016 (2016-09-22)[1]
Written in Erlang
Operating system Cross-platform
Type Web server
License BSD licence
Website yaws.hyber.org
The LYME and LYCE software bundles are based on Erlang and comprise Yaws. They are composed entirely of free and open-source software

Yaws (Yet another web server) is a web server written in Erlang by Claes (klacke) Wikström. Yaws can be embedded into other Erlang-based applications or run as a regular standalone web server.[2]

Because Yaws uses Erlang's lightweight threading system, it performs well under high concurrency. A load test conducted in 2002 comparing Yaws and Apache found that with the hardware tested, Apache 2.0.39 with the worker MPM failed at 4,000 concurrent connections, while Yaws continued functioning with over 80,000 concurrent connections.[3]

The load test concludes,

"The problem with Apache is not related to the Apache code per se but is due to the manner in which the underlying operating system (Linux) implements concurrency. We believe that any system implemented using operating system threads and processes would exhibit similar performance. Erlang does not make use of the underlying OS's threads and processes for managing its own process pool and thus does not suffer from these limitations".[3]

and in the underlined part above (formatting added), expresses the opinion that the founding technologies make the difference in scalability.

See also

References

  1. ↑ "Releases · klacke/yaws · GitHub". Retrieved 2016-12-13.
  2. ↑ Steve Vinoski article at the IEEE Internet Computing review, July/August 2011
  3. 1 2 Ghodsi, Ali. "Apache vs. Yaws". Archived from the original on May 18, 2015. Retrieved January 17, 2007.
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