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Seth Ladd’s blog about Ruby on Rails and crunching data.

Enabling SMP Support for Erlang on Mac OS X

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If you are working with Erlang on Mac OS X and have installed it via Mac Ports, then you might not be running the SMP enabled erlang.

To check, start erlang as


erlang -smp

If you get:


Argument '-smp' not supported.

Then your erlang was not compiled with SMP. All you’ll need to do is:


sudo port uninstall erlang
sudo port install erlang +smp

Then when you run erlang -smp, you’ll be dropped right into the erlang shell. When you run anything with multiple processes, you’ll see both of your CPU cores active.

Possibly related posts: (automatically generated)

Written by sethladd

September 11, 2007 at 9:40 pm

Posted in erlang, mac

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One Response to 'Enabling SMP Support for Erlang on Mac OS X'

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  1. Interestingly, I installed Erlang 12B-0 with the smp variant from Macports yesterday. The simple command “erl” actually starts the shell with the smp option. To make it use only one processor, it’s necessary to start it like this: “erl -smp disable”.

    Brian

    17 Dec 07 at 2:15 am

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