[erlang-questions] list vs binary performarnce, destructuring and consing

Motiejus Jakštys <>
Tue Oct 23 10:50:25 CEST 2012

On Tue, Oct 23, 2012 at 9:07 AM, Martynas Pumputis <> wrote:
> Hi,
> Could you show the exact steps of your simulation? Binary version should be
> faster, because some extra memory allocation is avoided per each iteration
> and large binaries aren't being copied.
> Take a look at:
> http://www.erlang.org/doc/efficiency_guide/binaryhandling.html

I tried that last night and was surprised, so will share.

Benchmark script:

1> t:bench().
Creating str of size 1048576.. done.
Converting to binary.. done.
Executing STR copy 30 times... done.
Executing BIN copy 30 times... done.
BIN: Mean:   139461.1, stdev:   7829.9
STR: Mean:    79089.4, stdev:  53349.0

No matter how hard I try, I cannot outperform lists.

R15B02, 32-bit Linux.

Motiejus Jakštys

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