Fatal Error Message

Hello,
I have been running a program on my computer, but this time the case time length is very long. When I run it, it stops part way through and gives me this message:

fatal:NclMalloc Failed:[errno=12]
Segmentation fault (core dumped)

I must say, whenever I run the program (this time and other times), the program runs very quickly to begin with, but slows down over time.

Can somebody let me know what the error message means?
Thanks,
Lisa
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Received on Wed Mar 26 12:56:45 2014