The render log is accessible through the mac OS X console application. Open Console click on show log list and find
FILES
~/Library/Logs
Maya
mayaRender.log
or use the finder; press Shift + Command +G and type ~/Library/Logs/Maya
you'll find the log in there. It's a simple text file, you can copy it, rename it to mayaRender.txt and open it with the textedit app.
executing the memory command is done as follows:
open Window->General Editors->Script Editor
make sure to click on the MEL tab and type
memory -sum;
click on the blue arrow button.
Michiel
http://www.thnkr.com