@sand15 

Thank you for creating the examples. For the following reasons, I am not sure what to make of your examples:

1. My matrices are relatively sparse and I specified "storage=sparse" when creating them.
2. In the past have successfully openned larger matrices of a similar type to the 120,000 x 120,000 matrices that I am considering at the moment.

Perhaps, by some numerical quirk, the matrices produced by this particular example may be less sparse than other examples that I have considered.

@Rouben Rostamian  

Thank you for the suggestion.

I tried setting "ulimit unlimited" in bash before starting maple. After this, setting kernelopts(stacklimit=130560), the error occurred at approximately 7 GB of RAM usage. Restarting maple and setting kernelopts(stacklimit=261120), the error occurred at approximately 6.5 GB of RAM usage, so "ulimit unlimited" does not appear to have changed the behaviour on this system.