[Top][All Lists]

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

[Bug-glpk] spydual crash in GLPK 4.57

From: Sascha Brügmann
Subject: [Bug-glpk] spydual crash in GLPK 4.57
Date: Mon, 25 Jan 2016 17:55:16 +0100
User-agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:38.0) Gecko/20100101 Thunderbird/38.5.1

Hello everyone,
I solve many problems with GLPK and every 5000-nth problem or so (no fixed number, just a hint how often it occures) GLPK terminates in the middle of integer-solving my problem. The following message is then printed:
Assertion failed: tcol[csa->p] != 0.0
Error detected in file ..\src\simplex\spydual.c at line 999

I invoke GLPK from a Java application using glpk-java. glpk-java is able to catch some occurances of this error and throw them as org.gnu.glpk.GlpkException such that my programm can catch them and just restart GLPK (works fine!). Unfortunately most of the occurances of the error kill GLPK and the JVM instantly and there is nothing I can do. I have to notice the crash manually and restart my application manually.

All my problems are only slight variations of each other. Until now I couln't blame specific variations of my problem to cause this error because when I let GLPK re-solve the same problem it finds a feasible solution (all my problems have a feasible solution).

Parameters I invoke GLPK with:
        glp_prob lp_native = GLPK.glp_create_prob();
        //add constraints...

        final glp_iocp iocp = new glp_iocp();

        GLPK.glp_intopt(lp_native, iocp);

Regards Sascha

reply via email to

[Prev in Thread] Current Thread [Next in Thread]