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 23.0
|23.0.2||(Major release)||February 14, 2009|
GAMS Major Release 23.0.2 - February 14, 2009
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.
- Fix to not limit the size of the block read to 65536 lines
- Updated McCarl GAMS User's Guide
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
poutil (342): Portfolio Optimization for Electric Utilities
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
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).
New libraries 11.2.1
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.
New libraries 5.2.0
New libraries 18.104.22.1685
New libraries 5.0 rev 112
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
- 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 - 23.0 February 14, 2009|
Digital Unix 4.03
|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.|