[erlang-questions] Optimization for the ++ operator

José Valim jose.valim@REDACTED
Fri Jun 1 10:46:28 CEST 2012

> The '++' operator does not verify that the second argument is a list.
> Therefore, the compiler will rewrite the first expression to simply:
> [$F,$o,$o|Bar]

Yes, thanks. For some weird reason I thought Erlang restricted the right
side to be a list in such cases.

> Have you made sure that you run each test in a newly spawned process?

Do you run the test for long enough time?

Running in a newly spawned process did the trick, the results are now
I was already running it 1000 times, here is the code (without using spawn):


I assume having a "clean" heap (reducing the chance of garbage collection)
is the reason why it is a good idea to run benchmarks in a newly spawned

Thanks Björn!
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