available GA memory not enough?


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Use the memory keyword http://nwchemgit.github.io/index.php/Release66:Top-level#MEMORY

Memory for GAs is controlled by the global option so you either need to increase the total memory if possible, or change the distribution of memory between stack, heap, and global. For the majority of routines in NWChem, you do not need a lot of heap space so you could easily move memory from heap to global.