The Guide for Rails performance testing has instructions for patching ruby to provide garbage collection statistics. The only problem is, the patch is against a ruby version that is 2 and a half years old and doesn't compile by default on my machine.
The patch doesn't apply cleanly against the latest ruby 1.8.7 (p249). I found a version of the patch on github and fixed it up to apply to 1.8.7. Here is my fixed up copy.
I downloaded ruby from here and applied my updated patch with "patch -p1" and it compiled fine and doesn't seem to have any problems. Of course this version of ruby is only for profiling.
Updated Feb 2, 2010
Sorry to disappoint, but when I finished the patching the rails performance tests still wouldn't give me memory metrics. Back to the drawing board. I'll update this when I get a better patch.
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