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Enabling SMP Support for Erlang on Mac OS X

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.

This entry was posted on Tuesday, September 11th, 2007 at 9:40 pm and is filed under mac, erlang. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.

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

  1. Brian Says:
    December 17th, 2007 at 2:15 am

    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”.

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