23.0 Distribution
Table of Contents
23.0.2 Major release (February 14, 2009)
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 Surendu Korgaokar, Tom Rutherford, Stefan Vigerske and Rich Roberts.
GAMS System
GAMS Data Utilities
GDXXRW
- Fix to not limit the size of the block read to 65536 lines
Documentation
- Updated McCarl GAMS User's Guide
Other
As announced earlier we dropped the following systems as of this GAMS Distribution.
- GAMSBAS: The newer savepoint/loadpoint facility is easier to use and more robust.
- MPSWRITE: The newer CONVERT utility includes this capability
Model Libraries
GAMS Model Library
- poutil (342): Portfolio Optimization for Electric Utilities
GAMS Test Library
- privat01 (432): Test private workfile behavior
- emp04 (431): Compare results of EMP runs using different options for nlp problem
- local01 (430): Test .local in different context $on/offlocal
- empdisj1 (429): Test EMP Disjunction - Minimize the makespan
- empecs02 (428): Test for EMP-Embedded Complemenarity System
- empecs01 (427): Test for EMP-Embedded Complemenarity System
- empvi04 (426): Test for EMP Variational Inequalities
- empvi03 (425): Compares alternative EMP-VI models
- empvi02 (424): Compares manual and EMP-VI models
- empvi01 (423): Simple test for variational inequalities through EMP
- empbp03 (422): Simple bilevel model, both inner and outer problems have constraints
- empbp02 (421): Simple bilevel model, outer problem consist of objective only
- empbp01 (420): Simple bilevel model, inner problem consist of objective only
- convert7 (419): CONVERT test suite - test hessian info correctness
- lp14 (418): Simple test on one equation AFTER reformulation
- card01 (417): Test extended card and ord functions
- suffix01 (416): Test suffix options on controlling sets
- nlp01 (415): Test of correctness for levels & marginals of NLP
Solvers
As announced in the 22.9 release notes we dropped the following solvers as of this GAMS Distribution.
- CONOPT1 (old version of CONOPT). The default CONOPT version, CONOPT 3, will not be dropped.
- MILESOLD (old version of MILES). The default MILES version will not be dropped.
- OSL1 and OSL2 (old versions of OSL). The default OSL version will not be dropped.
- PATHOLD (old version of PATH). The default PATH version will not be dropped. Due to user requests, and despite our earlier announcement, we did not drop the following components:
- CONOPT 2 (old version of CONOPT).
- DEA
CPLEX
- New libraries 11.2.1
GUROBI
- The new Gurobi solver provides state-of-the-art simplex-based linear programming (LP) and mixed-integer programming (MIP) capability.
- The Gurobi MIP solver includes shared memory parallelism, capable of simultaneously exploiting any number of processors and cores per processor. The implementation will be deterministic: two separate runs on the same model will produce identical solution paths.
- The Gurobi solver is available for the 32-bit and 64-bit versions of Windows and Linux. Please contact us for an evaluation license.
KNITRO
- New libraries 5.2.0
LINDOGLOBAL
- New libraries 5.0.1.345
MOSEK
- New libraries 5.0 rev 112
XPRESS
- New libraries 19.00.04
- The primal algorithm has been improved and is now 40% faster on XPRESS' LP benchmark test set and 20% faster on XPRESS' large LP benchmark test set.
- The dual algorithm has been improved and is now 22% faster on XPRESS' LP benchmark test set and 45% faster on XPRESS' large LP benchmark test set.
- The MIP performance has been improved and is now 40% faster on XPRESS' MIP benchmark test set
- Improvements to the Quadratic Primal algorithm to avoid cycling problems
In-core communication solver links
- Support of GUROBI as an in-core communication solvers.
- Experimental in-core link MINOSD
- Enhancements and bug fixes for the in-core communication solver links BDMLPD, CONOPTD, and CPLEXD Where a traditional link already exists, the newer in-core link version has a "D" appended to the name (D for DLL). These in-core links are very similar to their traditional predecessors. They may lack some functionality but offer in-core communication between GAMS and the solver, making potentially large model scratch files unecessary. This can save time if you solve many models in your GAMS program.
Solver/Platform Availability Matrix
| Solver/Platform availability - 23.0 February 14, 2009 | ||||||||||||||
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| 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 4.3 |
Mac PowerPC Darwin |
Mac Intel32 Darwin |
HP 9000 HP-UX 111 |
SGI IRIX2 |
DEC Alpha Digital Unix 4.03 |
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| ALPHAECP |  |
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| BARON 8.1 | |
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| BDMLP | |
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| COIN | |
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| CONOPT 3 | |
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| CPLEX 11.2 | |
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10.0 | 9.1 | 8.1 | ||
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| DICOPT | |
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| GUROBI 1.0 | |
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| KNITRO 5.2 | |
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| LINDOGLOBAL 5.0 | |
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| LGO | |
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| MILES | |
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| MINOS | |
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| MOSEK 5 | |
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3.2 | ||||
| MPSGE | |
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| MSNLP | |
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| NLPEC | |
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| OQNLP | |
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| OSL V3 | |
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| OSLSE | |
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| PATH | |
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| SBB | |
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| SNOPT | |
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| XA | |
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| XPRESS 19.00 | |
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32bit | 18.00 | 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. | ||||||||||||||