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Release Notes

Major releases contain substantial changes to the GAMS system. The License Check date is set to the release date of the major release.

Minor releases are mainly issued to provide bug fixes, performance improvements, and maintenance releases of solver libraries. Additionally, they can provide a few new features that do not change existing behavior. The License Check Date remains the same as for the prior major release. This means that any license file that worked with the prior major release will also work with this minor release.

Maintenance releases do not provide any new features. They are issued to provide bug fixes, performance improvements, and maintenance releases of solver libraries. The License Check Date remains the same as for the prior major release. This means that any license file that worked with the prior major release will also work with this maintenance release.

GAMS Distribution 23.5

Distribution History

23.5.2 (Maintenance release) August 18, 2010
23.5.1 (Major release) July 05, 2010

GAMS Maintenance Release 23.5.2 - August 18, 2010

  • AlphaECP: Fix for crash running under IDE
  • API: Updated Python and Java APIs and examples
  • Baron: Fixed issue with output formatting under Linux
  • Baron: Memory leak when using BARON with external NLP solver
  • Gdxmerge: Do not use path when checking for merged.gdx
  • Gurobi: Fixed typo for option displayinterval
  • McCarl Guide: Updates for 23.5
  • Mosek 6 rev 85 libraries
  • MPS2GMS: Removed mps2gms debug message
  • Snopt: Fix for wrong return code (local,global)
  • Xlsdump utility added

GAMS Major Release 23.5.1 - July 05, 2010

Acknowledgments

We would like to thank all of our users who have reported problems and made suggestions for improving this release. In particular, we thank Farhad Farnam and Alexander Gocht.

GAMS System

APIs

  • new VB.net example using GDX, Option and GAMS DLL: apifiles\examples\example2.vb
  • combine Java api files in package com.gams.api, existing applications need to be adjusted when using the new Java api files, see e.g. apifiles\examples\example1.java:
      package com.gams.example1;
      import com.gams.api.*;
      public class example1 {
      ... 
    

Solvers

BARON

  • New libraries 9.0.6

CONOPT

  • New libraries 3.14U

CPLEX

  • New libraries 12.2
  • MIP kappa describes a new feature extending the computation of kappa to mixed integer programming (MIP). (In linear programming, kappa is also known as the condition number of a solution.) See GAMS/Cplex parameter mipkappastats for details.
  • Intel processors prior to Pentium 4 are no longer supported.
  • The MIP node log interval (GAMS/Cplex parameter MIPInterval) now accepts either a positive or negative integer value, making it easier for you to adjust the amount of information logged for your problem.
  • The default value of the GAMS/Cplex ClockType parameter has changed from 0=automatic (let Cplex choose) to 2 (wallclock time).
  • The concurrent optimizer launches distinct optimizers on multiple threads. Cplex now offers concurrent, deterministic optimization of linear programming models (LPs) when more than one thread is given to Cplex (GAMS/Cplex parameter Threads). Running concurrent optimizers simultaneously on multiple threads may consume more memory. If the memory reduction parameter (MemoryEmphasis) is turned on, then you have instructed CPLEX to conserve memory. In that case, Cplex does not run concurrent, deterministic optimization unless parameter LPMethod is explicitly set to 6.
  • New parameter AuxRootThreads: Partitions the number of threads for Cplex to use for auxiliary tasks while it solves the root node of a problem. On a system that offers N processors or N global threads, if you set this parameter to n, where N > n > 0 then Cplex uses at most n threads for auxiliary tasks and at most N-n threads to solve the root node.

GUROBI

  • New libraries 3.0.1
  • Now also available on Mac OS X Intel 64bit

LINDOGLOBAL

  • New libraries Lindo 6.1.1 for all platforms except for Solaris Sparc 32 bit and 64 bit
  • Now also available on Mac OS X Intel 64bit

Model Libraries

GAMS Test Library

Solver/Platform Availability Matrix

Solver/Platform availability - 23.5    July 4, 2010
  x86
MS Windows
x86_64
MS Windows
x86
Linux
x86_64
Linux
Sun Sparc
SOLARIS
Sun Sparc64
SOLARIS
Sun Intel
SOLARIS
IBM RS-6000
AIX 5.3
Mac Intel32
Darwin
Mac x86_64
Darwin
HP 9000
HP-UX 111
SGI
IRIX2
DEC Alpha
Digital Unix 4.03
Mac PowerPC
Darwin4
ALPHAECP X X X X X X X X X X     X X
BARON 9.0 X X X X                    
BDMLP X X X X X X X X X X X X X X
COIN-OR X X X X     X   X X        
CONOPT 3 X X X X X X X X X X X X X X
CPLEX 12.2 X X X X X X X X X X 10.0 9.1 8.1  
DECIS X X X X X 32bit         X X X  
DICOPT X X X X X X X X X X X X X  
GUROBI 3.0 X X X X           X        
KNITRO 6.0 X X X X 5.2 32bit     X          
LINDOGLOBAL 6.1 X X X X 6.0 6.0 X   X X       X
LGO X X X X X X X   X X X X X X
MILES X X X X X X X X X X X X X X
MINOS X X X X X X X X X X X X X X
MOSEK 6 X X X X 5.0 5.0 X   X X 3.2      
MPSGE X X X X X X X X X X X X X X
MSNLP X X X X X 32bit     X X X      
NLPEC X X X X X X X X X X X X X X
OQNLP X 32bit X 32bit                    
PATH X X X X X X X X X X X X X X
SBB X X X X X X X X X X X X X X
SCIP X X X X     X   X X        
SNOPT X X X X X X X X X X X X X X
XA X 32bit X X X 32bit         X   X X
XPRESS 20.00 X X X X X X X X     16.10      
1)GAMS distribution for HP 9000/HP-UX is 22.1.
2)GAMS distribution for SGI IRIX is 22.3.
3)GAMS distribution for DEC Alpha is 22.7.
4)GAMS distribution for Mac PowerPC is 23.3.