Multi-threaded Solves
The Xpress Optimizer is a multi-threaded solver and will always try to use all available processing cores in your computer. It automatically detects the number of cores available and will limit the number of parallel threads it can start accordingly.
If your Xpress Optimizer has to share system resources with other applications that might be running simultaneously, it might be necessary to limit how many threads, and thereby how many cores, the Xpress Optimizer is allowed to use. Use the THREADS control to set such a limit. By setting THREADS=1, you force the Xpress Optimizer to use a single thread only, which effectively turns off all parallelism. Note that in the case of Tuner runs, THREADS controls the number of threads per solve run, while the additional TUNERTHREADS control determines how many different settings are tried in parallel solver runs. Consequently, the product of THREADS and TUNERTHREADS should be equal to or less than the number of available threads on the machine.
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