Acknowledgements

We would like to thank all of the users who have reported bugs or made suggestions in improving this release.

New platforms supported

• 64 bit x86_64 (Linux) version introduced. Linux licensing includes both 32 and 64 bit at a single platform cost. Some solvers exist only in 32 bit mode and are included as 32 bit on the 64 bit version. See the solver platform matrix below.
• Macintosh PowerPC (Darwin) version introduced.

See our sales page for available solvers by platform.

GAMS System

Model Library

• Several new models have been added. See the GAMS Model Library for details.

New Workfile Format

• now a single file (G00 file extension). Files can be read that were created on different platforms. File is packed and only approx 50% of previous file size. Read and write is also substantially quicker.

Testlib Library:

• Updates to quality model
  • take advantage of solver updates & fixes
  • added --QUICK=1 option to skip slow tests
  • test all solvers, using system.solverNames and filter list
  • allow skips of models in solver-specific test suites

• New models

  • convert solver test suite
  • new cmex & MIP tests, test new workfile format save/restart

  See the testlib library for details.

Solvers

BARON

• New libraries (version 7.2.5) which address minor bug fixes and enhancements

BENCH

• promoted from beta solver.

GAMS/AMPL Link

• a GAMS/AMPL link has been introduced.

GAMS/LINGO Link

• a GAMS/LINGO link has been introduced.

MOSEK

• New libraries (version 3.2) which address minor bug fixes and enhancements.

NLPEC

• Relaxed the test for complementarity of the solution proposed by the reformulated model to work better for poorly-scaled models

XA

• update to documentation (nodelimit, log output)
• numerous library updates to fix outstanding issues
• improved handling of solver status 4=TERMINATED BY SOLVER

XPRESS

• deal with "recoverable errors" on return from barrier method
• minor improvements and workarounds for library quirks in link

Solver/Platform Availability Matrix

Solver/Platform availability - 21.7
	Intel MS Windows	x86_64 Linux	Intel Linux	Sun Sparc SOLARIS	HP 9000 HP-UX 11	DEC Alpha Digital Unix 4.0	IBM RS-6000 AIX 4.3	SGI IRIX	Mac PowerPC Darwin
BARON 7.2		32bit
BDMLP
COIN
CONOPT 3
CPLEX 9.0						8.1
DECIS
DICOPT
KNITRO 4.0		32bit
LGO
MILES
MINOS
MOSEK 3.2
MPSGE
MSNLP
OQNLP		32bit
OSL V3		32bit			V2			V2
OSLSE		32bit
PATH
SBB
SNOPT
XA		32bit
XPRESS 15.25		32bit			15.20		15.20