Node storage file switch

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Used when working memory (CPX_PARAM_WORKMEM, WorkMem) has been exceeded by the size of the tree. If the node file parameter is set to zero when the tree memory limit is reached, optimization is terminated. Otherwise, a group of nodes is removed from the in-memory set as needed. By default, CPLEX transfers nodes to node files when the in-memory set is larger than 128 MBytes, and it keeps the resulting node files in compressed form in memory. At settings 2 and 3, the node files are transferred to disk, in uncompressed and compressed form respectively, into a directory named by the working directory parameter (CPX_PARAM_WORKDIR, WorkDir), and CPLEX actively manages which nodes remain in memory for processing.

CPX_PARAM_WORKMEM, WorkMem and CPX_PARAM_WORKDIR, WorkDir