> I have been using GLPK for almost a year now to solve integer > optimization problems quite satisfactorily, but I'm now encountering a > serious problem. > The model I'm trying to solve has 342 370 columns (variables are > 3-dimensional, in the form of 134 operators x 7 work shifts x 365 > days), all of them binary, and I fear an even bigger number of rows > which I'm not able to count. When I try to run GLPK (through command > line) I get the following log:
> xmalloc: no memory available > Error detected in file ..\src\glplib07.c at line 72 > And a pop-up tells me that "The exception unknown software > exception (0x40000015) occurred in the application at location > 0x10034999.". I'm not able to debug this myself. > Note that this has been transcribed by me reading the prompt since > that error prevents the creation of the log itself. > I managed to make it work setting the days count to 49; 6 months gave > me the same treatment. > I got this both on a Pentium 4 2.40 GHz with 2 GB of RAM and on a > Core2 Duo E8400 3 GHz with 4 GB of RAM, running XP Professional SP 3. Thank you for your report. It is not a bug. The mathprog translator used all available memory, and on a next call to malloc it failed (returned NULL). Please note that the current glpk mathprog implementation is not efficient, so the translator cannot process huge models at least on 32-bit platforms. To estimate the amount of memory needed to translate and run mathprog models please see: http://lists.gnu.org/archive/html/help-glpk/2008-07/msg00044.html _______________________________________________ Bug-glpk mailing list Bug-glpk@gnu.org http://lists.gnu.org/mailman/listinfo/bug-glpk
