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megapoliss • last Monday at 11:33 AM • 1 reply • view on HN

I used brainfuck interpreter https://github.com/Beariish/bolt/blob/main/examples/bf.bolt vs lua / luajit implementations from https://github.com/kostya/benchmarks

Just checked with nbody:

  - still 10 times slower than luajit
  - 2 times slower than luajit -joff
  - but 20% faster than lua 5.4
  - but uses 47 Mb RAM vs 2.5 Mb for lua/luajit

Replies

beariish • last Monday at 12:16 PM

I appreciate the followup here. The brainfuck interpreter isn't meant to be a benchmark notably, it's a naive implementation for the sake of the example.

I did spot some poor code in the Bolt version of nbody that can be changed (the usage of `.each()` in the hot loop is creating loads of temporary iterators, that's the memory difference.)

luajit -joff does perform better even with this change, but I observe closer to 15% than a 2x difference

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