Django is terribly slow on Mac OS X Lion

Question

I recently did a clean install of OS X Lion. I'm now running Django 1.2.5 on Python 2.6.6 using virtualenv. The MySQL version is 5.5.14 (installed via homebrew). When I run the test suite of one of my applications now, it is just insanely slow. Usually the whole test suite would take about 4-5 minutes. Now after that time it isn't even done with ~30%.

Anybody any ideas on how I could narrow down the bottleneck? Could it be the fresh install of MySQL is just configured bad? How would I benchmark MySQL best and what might be the issue with the (InnoDB) tables? Maybe I'm not the only one having these problems...

Answer 1

OK, so to answer my own question, I found out it was actually just bad default settings for the MySQL installation. I ran over this script called MySQLTuner and it showed me some variables I should change. After following it's recommendations the tests finish in normal times again.

Answer 2

According to this TechCrunch article: Nine Things You Should Do After Installing OS X Lion , Lion is re-indexing your files. Leave it alone for a good few hours.

Answer 3

Following link may help >> http://www.stereoplex.com/blog/speeding-up-django-unit-test-runs-with-mysql

I config /etc/my.cnf with this suggestion, and Django runs fast!

[mysqld]
skip-sync-frm=OFF