2017-11-07

Elixir/Erlang better than Go, really?

The microbenchmark result for spawning short-lived concurrent process:

# Go 1.8.0
$ go build test.go ; for k in 5 50 500 5000 50000 500000; do echo -n $k; time ./test $k > /dev/null; done

5
CPU: 0.00s      Real: 0.00s     RAM: 2080KB
50
CPU: 0.06s      Real: 0.01s     RAM: 3048KB
500
CPU: 0.61s      Real: 0.12s     RAM: 7760KB
5000
CPU: 6.02s      Real: 1.23s     RAM: 17712KB # 17 MB
50000
CPU: 62.30s     Real: 12.53s    RAM: 207720KB # 207 MB
500000
CPU: 649.47s    Real: 131.53s   RAM: 3008180KB # 3 GB

# Elixir 1.4.2 (erts-8.2.2)
$ for k in 5 50 500 5000 50000 ; do echo -n $k; time elixir --erl "+P 90000000" test.exs $k > /dev/null; done

5
CPU: 0.53s      Real: 0.50s     RAM: 842384KB # 842 MB
50
CPU: 1.50s      Real: 0.62s     RAM: 934276KB # 934 MB
500
CPU: 11.92s     Real: 2.53s     RAM: 1675872KB # 1.6 GB
5000
CPU: 122.65s    Real: 20.20s    RAM: 4336116KB # 4.3 GB
50000

CPU: 1288.65s   Real: 209.66s   RAM: 6573560KB # 6.5 GB

You can find the code here. In terms of performance, it's not really, but you can argue about anything else.