Xpress patch release 8.0.7

Document created by zsoltcsizmadia@fico.com on Nov 7, 2016
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Xpress patch 8.0.7 is now available on FTP and Box for Windows 64 and 32, Linux 64 and Mac 64 from

 

https://fico.box.com/v/xpress-8-0-7

 

Xpress-Optimizer 29.01.13 release notes:

 

* New control MIPRAMPUP to control the ramp-up phase of a parallel MIP solve. It currently takes two values:

    0 - Disable the ramp-up phase and use all cores available from the start

    1 - Wait for the first dives to finish before maximizing core utilization. [Default]

  By keeping some cores idle during the first dives, there will be less contention for memory bandwidth, thereby allowing them to reach better solutions faster.

* Fixed an issue with presolve eliminations that may result in an incorrectly presolved problem.

* Fixed an issue with the disconnected component presolver that could result in an inconsistent internal bound state.

* Fixed an issue with the Python interface that may lead to undefined behavior when using the API function addmipsol().

* Fixed an issue with the Python interface that would prevent getindicators() from working with correct row indices and Python constraint objects.

* Fixed an issue with the Python interface that prevented any output log from being printed in Windows.

* Fixed an issue with the Python interface where an incorrect declaration of an SOS might trigger undefined behavior.

* Fixed an issue with the Python interface that might make the program crash when using incorrectly constructed NumPy arrays.

* Fixed an issue with iisstatus() in the Python interface that might make the program crash when omitting one or more arguments.

 

Xpress-Nonlinear 29.01.13 release notes:

 

* Fixed a convergence issue for problems converging with active penalties

 

This is the latest Xpress update for the Xpress 8.0 release branch. Please note that it must be installed over a prior installation of FICO Xpress 8.0 and requires a valid Xpress 8.0 license.

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