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# Not enough memory

In fact, it might be difficult to run huge jobs on "thin" T3E or SP2 nodes. Most tables (pseudopotentials etc.) and the executable must be held on all nodes (10-20 Mbytes). In addition one complex array of the size ${\displaystyle N_{{{\rm {bands}}}}\times N_{{{\rm {bands}}}}}$ is allocated on each node; during dynamic simulation even up to three such arrays are allocated. Upon reading and writing the charge density, a complex array that can hold all data points of the charge density is allocated 8*NGXF*NGYF*NGZF). Finally, three such arrays are allocated (and deallocated) during the charge density symmetrisation (the charge density symmetrisation takes usually the hugest amount of memory.) All other data are distributed among all nodes.