O-Ring

Ring Erlang exercise implemented in several languages.

Exercise

Taken from "Programming Erlang", second edition (by Joe Armstrong):

Write a ring benchmark. Create N processes in a ring. Send a message
round the ring M times so that a total of N * M messages get sent. Time
how long this takes for different values of N and M.
Write a similar program in some other programming language you are
familiar with. Compare the results. Write a blog, and publish the results
on the Internet!

Guidelines

To partecipate to the benchmark, you must adopt on the following guidelines:

• every implementation shall expose an executable file (bash script or program) named ring
• every implementation shall agree on the following API when ring is invoked: ./ring NumberOfNodes NumberOfTrips where:
  • NumberOfNodes: the number of processes/threads/nodes in the ring, N in the description above
  • NumberOfTrips: the number of times a message is passed in the ring, M in the description above
  • returned value of the script should be 0 if ok
  • in case of errors, nothing shall be written on stdout (you can write on stderr), and error code shall be different than 0
• every implementation shall measure the time interval T0 used to setup the ring
• every implementation shall measure the time interval T1 in milliseconds between the instant the first message is sent and the instant the last one is received
• every implementation shall write to stdout a single number, T, described above
• every implementation shall be provided in a separated folder with a significant name
• every implementation shall provide a README.md file with (at least) the following sections:
  • Build: instructions on how to build; after a successful build, a ring executable should be present in a build directory
  • Description: a brief description of the implementation
• every implementation has complete freedom on all other aspects not specified above

Example Output

> ./ring 200000 30
465 2990 200000 30

where:

• 465 is the time in ms to setup the ring
• 2990 is the time in ms from the first message to the last one
• 200000 is the number of nodes in the ring
• 30 is the number of trips (how many times we sent a message in the ring)

Erlang

• Build

cd erling
erlc ring.erl

• Run

./ring 200000 30

Elixir

• Build

cd exring
mix escript.build

• Run

./exring 200000 30

Go

• Build

cd goring
make all

• Run

./ring 200000 30

Haskell

• Build

cd haskring
make all

• Run

./ring 200000 30

Scala

Benchmark

Authors

• Federico Bertolucci
• Gian Lorenzo Meocci (glmeocci @ gmail.com)
• Nicola Bonelli (nicola.bonelli @ gmail.com)
• Alfredo Di Napoli