-------- Forwarded Message -------- From: Ronald Wolthoff <[email protected]> To: [email protected] Subject: memory Date: Thu, 24 Nov 2011 09:44:57 -0500
Hello, I'm using GLPK in combination with CMPL and I encounter some issues with the time required for preprocessing. My problem has 2N^2 rows and 2N^4 columns (real variables, less than 1% non-zeros). When I run the problem for N=15 (450 rows, 101250 columns), the preprocessing takes approximately 1 minute and the solver 3 seconds, which is great. When I use N=30 instead (1800 rows, 1,620,000 columns) , the solving time goes up to a few minutes, which is still great, but the preprocessing time explodes to something like 9 hours. Although the problem is fairly large, this increase seems stronger than expected. Is there a way I could reduce the preprocessing time, e.g. by allocating more memory to the program? Many thanks, Ronald _______________________________________________ Help-glpk mailing list [email protected] https://lists.gnu.org/mailman/listinfo/help-glpk
