Hi Robbie, please, look at glpk guide first. If you are solving a MIP problem I suppose you are using glp_intopt instead of glp_simplex. In that case you have to set up a different parm struct whose name is glp_iocp.
glp_iocp parm; ... glp_init_iocp(&parm); parm.tm_lim = 60000; glp_intopt(MIP, &parm); ... Best, Gio 2013/6/19 Robbie Morrison <[email protected]> > > Hi John, Andrew, all > > ------------------------------------------------------------ > To: john tass <[email protected]> > Subject: Re: [Help-glpk] predefined execution time of glpk > Message-ID: <1371545937.2157.5.camel@corvax> > From: Andrew Makhorin <[email protected]> > Date: Tue, 18 Jun 2013 12:58:57 +0400 > ------------------------------------------------------------ > > >> Is it possible, within a C++ aplication, to > >> predefine a time limit of gkpk execution , and > >> after this time expires to be able of getting > >> the best solution that glpk has found so far ? > >> Is there any command I must include in my C++ > >> application? For your information, the linear > >> problem I try to solve is extemely hard and has > >> a very big size. So, I can not affort to wait > >> for its solution but I want the best solution > >> within 60 secs instead. > > > > #include <glpk.h> > > glp_smcp parm; > > . . . > > glp_init_smcp(&parm); > > parm.tm_lim = 60000; > > glp_simplex(P, &parm); > > . . . > > > > For more details please see the glpk reference manual (doc/glpk.pdf) > > included in the distribution. > > Just to note, for completeness, that that works > fine for simplex calls, but may not for MIP > calls. This is because the time limit condition > is only checked when the linear relaxations are > attempted. In which case, call-backs might be > required for finer-grain control? Wasn't there a > thread on this issue earlier (I looked but > couldn't find it)? Or am I totally confused and > mistaken! > > cheers, Robbie > --- > Robbie Morrison > PhD student -- policy-oriented energy system simulation > Technical University of Berlin (TU-Berlin), Germany > University email (redirected) : [email protected] > Webmail (preferred) : [email protected] > [from Webmail client] > > > > _______________________________________________ > Help-glpk mailing list > [email protected] > https://lists.gnu.org/mailman/listinfo/help-glpk >
_______________________________________________ Help-glpk mailing list [email protected] https://lists.gnu.org/mailman/listinfo/help-glpk
