Awesome Open Source
Awesome Open Source

Table of Contents


The idea behind this repository is to benchmark different languages implementation of HTTP server.

Hello World

The application i tested is minimal: the HTTP version of the Hello World example.
This approach allows including languages i barely know, since it is pretty easy to find such implementation online.
If you're looking for more complex examples, you will have better luck with the TechEmpower benchmarks.


Please do take the following numbers with a grain of salt: it is not my intention to promote one language over another basing on micro-benchmarks.
Indeed you should never pick a language just basing on its presumed performance.


I have became lazy with years and just adopt languages i can install via homebrew, sorry Oracle/MS. This also allows me to benchmark them in a single session, thus trying to use an environment as neutral as possible. Where possible i just relied on the standard library, but when it is not production-ready (i.e. Ruby, Python).


Ruby 3.0.0 is used. Ruby is a general-purpose, interpreted, dynamic programming language, focused on simplicity and productivity.


Python 3.9.1 is used. Python is a widely used high-level, general-purpose, interpreted, dynamic programming language.


Node.js version 15.5.0 is used. Node.js is based on the V8 JavaScript engine, optimized by Google and supporting most of the new language's features.


Dart version 2.10.4 is used. Dart is a VM based, object-oriented, sound typed language using a C-style syntax that transcompiles optionally into JavaScript.


Elixir 1.11.2 is used. Elixir is a purely functional language that runs on the Erlang VM and is strongly influenced by the Ruby syntax.


Crystal 0.35.1 is used. Crystal has a syntax very close to Ruby, but brings some desirable features such as statically typing and ahead of time (AOT) compilation.


Nim 1.4.2 is used. Nim is an AOT, Python inspired, statically typed language that comes with an ambitious compiler aimed to produce code in C, C++, JavaScript or ObjectiveC.


GO 1.15.6 is used. GO is an AOT language that focuses on simplicity and offers a broad standard library with CSP constructs built in.



I used wrk as the loading tool.
I measured each application server six times, picking the best lap (but for VM based languages demanding longer warm-up).

wrk -t 4 -c 100 -d30s --timeout 2000


These benchmarks are recorded on a MacBook PRO 13 2019 having these specs:

  • macOS Catalina
  • 1.4 GHz Quad-Core Intel Core i5
  • 8 GB 2133 MHz LPDDR3


I measured RAM and CPU consumption by using macOS Activity Monitor dashboard and recording max consumption peak.
For the languages relying on pre-forking parallelism i reported the average consumption by taking a snapshot during the stress period.



Language App Server Requests/sec RAM (MB) CPU (%)
Ruby+MJIT Puma 36455.88 > 100 > 580
Elixir Plug with Cowboy 46416.25 50.5 583.8
Ruby Puma 47975.36 > 100 > 580
Dart Dart HttpServer 59335.33 193.2 429.1
JavaScript Node Cluster 87208.47 > 200 > 240
GO GO ServeMux 103847.10 10.0 429.1
Python Gunicorn with Meinheld 120105.65 > 40 > 380
Nim httpbeast 128257.98 11.4 99.6
Crystal Crystal HTTP 132699.78 8.5 246.7


I tested Ruby by using a plain Rack application served by Puma.


RUBYOPT='--jit' puma -w 8 -t 2 --preload servers/

Gunicorn with Meinheld

I tested Python by using Gunicorn spawning Meinheld workers with a plain WSGI compliant server.


cd servers
gunicorn -w 4 -k meinheld.gmeinheld.MeinheldWorker -b :9292 wsgi_server:app

Node Cluster

I used the cluster module included into Node's standard library.


node servers/node_server.js

Dart HttpServer

I used the async HTTP server embedded into the Dart standard library and compiled it with dart2native AOT compiler.


dart2native servers/dart_server.dart -k aot
dartaotruntime servers/dart_server.aot

Plug with Cowboy

I tested Elixir by using Plug library that provides a Cowboy adapter.


cd servers/plug_server
MIX_ENV=prod mix compile
MIX_ENV=prod mix run --no-halt

Crystal HTTP

I used Crystal HTTP server standard library, enabling parallelism by using the preview_mt flag.


crystal build -Dpreview_mt --release servers/


To test Nim i opted for the httpbeast library: an asynchronous server relying on Nim HTTP standard library.


nim c -d:release --threads:on servers/httpbeast_server.nim

GO ServeMux

I used the HTTP ServeMux GO standard library.


go run servers/servemux_server.go

Get A Weekly Email With Trending Projects For These Topics
No Spam. Unsubscribe easily at any time.
python (54,487
java (31,545
ruby (12,896
rust (4,729
golang (3,883
nodejs (3,804
dart (2,488
elixir (1,209
benchmark (251
http-server (197
nim (191
crystal (179