Samuel Richardson wrote:

I've run into a problem on my wiki where it appears image conversions are consuming all my available memory.

I've uploaded a screen shot of the the processes currently running, you can see it here:

http://www.richardson.co.nz/load.jpg

Note the "convert" process that is consuming 99megs per instance. How can I stop this from happening?

Thanks,

Reduce the value of $wgMaxShellMemory (add it with a lower value to LocalSettings). http://www.mediawiki.org/wiki/Manual:$wgMaxShellMemory

Since the problem looks like many processes, rather than a big process, perhaps you should also add some limits for concurrency. Also, I'd check which file are they converting, just in case all the instances are trying to convert the same big file.