On a realistic 3D geophysical benchmark with multiple sources, the non-overlapping optimized Schwarz method (OSM) outperforms the overlapping ORAS preconditioner by about a factor of two in time and memory when both are tuned.
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Comparison of substructured non-overlapping domain decomposition and overlapping additive Schwarz methods for large-scale Helmholtz problems with multiple sources
On a realistic 3D geophysical benchmark with multiple sources, the non-overlapping optimized Schwarz method (OSM) outperforms the overlapping ORAS preconditioner by about a factor of two in time and memory when both are tuned.