Calls Rust code from within Ruby using Foreign Function Interface (FFI).

The task:

Start ten threads. Inside each thread, count from one to five million. After All ten threads are finished, print out ‘done!’.

You may need to gem install ffi before running the example.

Run ruby embed.rb from the command line and you should see the comparison between Embedded Rust called from within Ruby and a pure Ruby implementation of the above task.

user     system      total        real
Embedded Rust
0.000000   0.000000   0.000000 (  0.000584)

user     system      total        real
Pure Ruby
2.730000   0.000000   2.730000 (  2.732160)