Error #273 (Available memory error) under Topology optimisation.

Hi everyone,

I am running a topology optimisation using optistruct solver under FRA. 

Because of the hard disk storage limits and the large computational time, i am trying to run using -core IN. This outputs the #273 error.
Exactly mentions that:
'The available memory, 2067 MB, is less than the minimum required, 5030 MB.'
But the physical memory of the computer is 96GB and also, in optistruct  -len 80000 is used. As i monitored that the use of the memory doesn't exceed 60 GB.

Also, before that error,  appears a warning which mentions:
'WARNING in hwsolver script execution:
-core option set, '-len 80000' is not used'

Could you please help me understand what is this error and how to run -core IN solution?

I tried also a -core OUT solution but the solution stacked to ITERATION 0 for more than 8 hours (running into 16 CPU cores). I believe due to the large output /temporary files of the solver. These files were more than 35GB in total. The output H3D file had not been created yet.

Thank you very much in advance.