Xpress Update 8.4.2

Document created by zsoltcsizmadia@fico.com on Dec 13, 2017
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Xpress Update 8.4.2 is now available on Box.com for Windows, Linux and Mac, from

 

              https://fico.box.com/v/xpress-8-4-2

 

This is the latest update for the Xpress 8.4 release branch. Please note that it must be installed over a prior installation of FICO Xpress 8.4 and requires a valid Xpress 8.4 license.

 

Release Notes:

 

Xpress-Mosel 4.8.1:

* Compiler Library - an issue has been resolved in the handling of conversions in string concatenations

* xprmsrv - windows: server no longer reports unjustified timeouts when starting instances

 

Xpress-Optimizer 32.01.05:

 

* Fixed a performance issue with diving heuristics that in some rare cases could trigger an unnecessarily long reoptimization solve.

* Fixed an issue that could result in a too high lower bound being returned for a MIP that was solved to completion during re-presolving.

* Fixed an issue where the tuner may stop prematurely when tuning a problem set without logging.

* Improved consistency of the barrier solver on different platforms.

* XPRSgetlastbarsol should now work when barrier was used in a concurrent solve.

* Improved performance of local search heuristics for problems with Special Ordered Sets (SOS).

* Fixed an issue which could cause a crash in the primal simplex.

* Fixed an issue that would prevent creation of a problem with rows and columns within the limits set by the Community license.

* Added missing method xpress.problem.nlpoptimize() to solve nonlinear optimization problems with the Xpress Python interface.

* Fixed an issue that could lead to a deadlock in the Python interface when using xpress.problem.mipoptimize() with callback functions.

* Fixed a memory leak in the modeling constructs of the Python interface.

 

Xpress-Nonlinear 32.01.05:

 

* Improved local search heuristics for MINLP problems.

* Improved relative infeasibility checks when XSLP_FILTER bit 1 is enabled.

* The SLP iteration solution refiner will now check for change in relative primal infeasibility.

* Added missing Knitro max nodes control export.

* XSLP_MIPITER now applies to the SLP-MIP-SLP and MIP-in-SLP heuristics as well.

* New fallback strategy for problems instable in linear presolve due to cascading structures.

 

Xpress-Kalis 12.6.2:

 

* Fixed an issue in the ‘produces()‘ constraints

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