  We present, to the best of our knowlegde, the first attempt to exploit the
supercomputer platform for quantum chemical density matrix renormalization
group (QC-DMRG) calculations. We have developed the parallel scheme based on
the in-house MPI global memory library, which combines operator and symmetry
sector parallelisms, and tested its performance on three different molecules,
all typical candidates for QC-DMRG calculations. In case of the largest
calculation, which is the nitrogenase FeMo cofactor cluster with the active
space comprising 113 electrons in 76 orbitals and bond dimension equal to 6000,
our parallel approach scales up to approximately 2000 CPU cores.
