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A further update: When restarting LS it doesn't seem to be stopping the current Ruby processes before spawning new ones, which is causing some of our memory problems.
Even after stopping LS there are lots of ruby processes still listed in memory. I'm having to manually killall ruby before starting LS back up again. After doing this the memory usage settles at about 4 gigs whereas after a 'graceful' restart it maxes out at 8GB and starts chewing into the swap drive.
If there are ruby processes left in memory after a restart and LS is still trying to use them then it could explain many of the odd errors we have been seeing.
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