MSC Nastran jobs sometimes comes out in the middle with an error like below in .f06 file.
*** USER FATAL MESSAGE 6136 (UDSFA)
INSUFFICIENT CORE FOR NUMERIC PHASE OF SPARSE DECOMPOSITION.
USER ACTION: INCREASE CORE BY 126613566 WORDS
This happens when ever insufficient memory is allocated to the job or exceeds the initial estimated memory calculated by the application. Continue reading