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Note on no. of ranks available: on S3DF, there are 120 cores per compute node. The below example asks for 3 nodes (120 x 3 = 360 ranks in total) will only have  have 120 x (3 - 1) + 1 = 241 ranks available. This is because all 120 ranks on the first node is fully reserved for SMD0. 

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