node storage file switch
Used when working memory (CPX_PARAM_WORKMEM
, WorkMem
)
has been exceeded by the size of the search tree.
Purpose
Node storage file switch
|
Description
Used when working memory specified by the
memory available for working storage parameter,
(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
the current value of memory available for working storage,
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 the directory for working files
(CPX_PARAM_WORKDIR
, WorkDir
),
and CPLEX actively manages which nodes
remain in memory for processing.
Value | Meaning |
---|---|
0 | No node file |
1 | Node file in memory and compressed; default |
2 | Node file on disk |
3 | Node file on disk and compressed |