[Macha]

OOM on OS X looks like the OS popping up a modal dialog asking you which application you'd like to kill because you're out of memory.

OOM on Linux looks like the OS just killing the heaviest application if you have no swap, or grinding to a halt if you have swap and actually need to use it as working memory.

OOM on Windows looks like your system grinding to a halt because you're paging all the time.