I know exactly zilch about this field, so it very well could be something that mundane. However, for spreading calculations across a cluster of 128 computers, I sort of hope they're using something more specifically tailored for the task.

Keeping in mind that my knowledge is zilch, here are some exotic languages that appear to be designed for this sort of thing:

http://en.wikipedia.org/wiki/X10_%28programming_language%29

http://en.wikipedia.org/wiki/Chapel_%28programming_language%...

http://en.wikipedia.org/wiki/Fortress_%28programming_languag...