KNITRO® Release History

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7.0 - Currently available
  7.0.0 - Sep 2010 - Major Release
 
  • KNITRO 7.0 introduces several improvements in linear algebra to improve performance. In addition to the HSL MA27 routine, KNITRO now also offers the option to use the HSL MA57 routine to solve sparse linear systems. MA57 will often be much faster on very large problems, and can more effectively exploit optimized BLAS and parallel BLAS routines for speedups. A new, dense QR option for solving linear systems is also introduced. A new feature was added to allow users to specify a branching priority for integer variables when solving mixed integer programs. Improvements in quickly identifying infeasible models using the active-set algorithm, and significant improvements in the limited memory quasi-Newton Hessian approximation have been made. This release also includes improved support for 64-bit architectures, including new support for Intel-based 64-bit Mac OS X and 64-bit Sun Solaris on x86_64.
6.0.0 - No longer available, but still supported
  6.0.0 - Mar 2009 - Major Release
 
  • KNITRO 6.0 introduces new features for solving optimization models (both linear and nonlinear) with binary or integer variables. The KNITRO mixed integer programming (MIP) code offers two algorithms for mixed-integer nonlinear programming (MINLP). The first is a nonlinear branch and bound method and the second implements the hybrid Quesada-Grossman method for convex MINLP. The KNITRO MINLP code is designed for convex mixed integer programming and is a heuristic for nonconvex problems. The MIP code also handles mixed integer linear programs (MILP) of moderate size. Many new user options beginning with "mip_*" have been added to offer user control over the MIP methods. In addition, the KNITRO multi-start generation of new start points is improved and the new user option "ms_maxbndrange" was added. See more details in the KNITRO 6.0 User's Manual and in the MINLP examples provided with the distribution.
5.2 - No longer available, but still supported
  5.2.0 - Mar 2008 - Minor Release
 
  • KNITRO 5.2 adds new user options to improve default algorithm performance, control multi-start behavior, control output, and emphasize achieving feasibility on problems with difficult nonlinear constraints. The distribution includes the Intel Math Kernel Library for BLAS and LAPACK functions, providing significant speedup on machines running an Intel processor. New user options include "bar_penaltycons", "bar_penaltyrule", "bar_feasible", "ms_num_to_save", "ms_savetol", "ms_terminate", "outdir" and "outappend". Options are given carefully selected default values, but can be modified to improve performance on difficult optimization problems. MATLAB® users may now interface to the KNITRO 5.2.0 libraries using the mex interface provided in Optimization Toolbox with MATLAB release R2008a. See the 5.2 KNITRO User's Manual for more information.
5.1 - No longer available, but still supported
  5.1.0 - Nov 2006 - Minor Release
 
  • KNITRO 5.1 adds new user options to improve algorithm performance, control multi-start behavior, and save iterates on large, difficult problems. The distribution includes the Intel Math Kernel Library for BLAS and LAPACK functions, providing significant speedup on machines running an Intel processor. The release also includes an object-oriented C++ example test driver. New user options include "bar_maxrefactor", "bar_maxbacktrack", "ms_maxbndrange", "ms_maxtime_cpu", and "ms_maxtime_real". Options are given carefully selected default values, but can be modified to improve performance on difficult optimization problems. The KNITRO interfaces for Mathematica and AMPL add new features. See the 5.1 KNITRO User's Manual for more information.
  5.1.1 - 20 Feb 2007 - New features and bug fixes
 
  • Allows linking with any BLAS and LAPACK library; in particular, the ACML from AMD.
  • Places the KNITRO Java API in a package named com.ziena.knitro and distributes the class as a jar file.
  • Adds CPLEX 10.1 to the list of CPLEX libraries searched for when using option "lpsolver".
  • Fixes an error in the solution reported by the KNITRO AMPL solver when the objective is linear with a constant term. The final objective reported in the AMPL status line was incorrect, disagreeing with the correct objective reported by KNITRO.
  5.1.2 - 27 Jul 2007 - New features and bug fixes
 
  • KNITRO can check out licenses from the Ziena network server and reuse them. This reduces overhead and makes the license server more robust when an application solves thousands of optimization problems.
  • Improves multithreaded performance on Windows by using Critical Sections and linking with the MSVC LIBCMT library (/MT).
  • Adds CPLEX 10.2 to the list of CPLEX libraries searched for when using option "lpsolver".
  • Allows the Ziena license manager to run on Windows machines installed with the Spanish language option.
 

View a text file with the complete release history.

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