Hello everybody,
I am using a 32GB of RAM, 8 cores 64-bit Linux computer. When I run the problem with a small data set using (ampl/gurobi) everything works fine
and gurobi gives me an optimal solution. But when I increase the problem size I get:
ampl: commands ilp.run;
Presolve eliminates 556000 constraints.
Adjusted problem:
556611 variables, all binary
806111 constraints, all linear; 556055500 nonzeros
1111 equality constraints
805000 inequality constraints
1 linear objective; 556611 nonzeros.
Error at _cmdno 1117410 executing "solve" command
(file ilp.run, line 36, offset 828):
can't open /tmp/at16918.sol
Through top command I see that only ampl is running and gurobi not invoked yet.. ampl consumes up to 98% of RAM. I wonder if the issue
occurs when ampl is trying to pass the problem to gurobi and it is running out of memory !?
because I thought 32 GB is largely enough RAM ...
Any suggestions on how to fix this ?
Thanks,