Originally posted by: kpnane

I am working on MIP problem using GAMS/CPLEX and looking to do performance tuning -- reduce the computation time of the solution.

I have written code before the "solve command" (in GAMS) instructing CPLEX to use parallel processing

$onecho > cplex.opt

threads 7
varsel 3
nodesel 3
mipemphasis 3
cuts 2

$offecho

selecting MIP strategy, node selection, etc.. but while examining the log file, CPLEX hasn't followed any of these instructions -- not running in parallel mode, same Dynamic MIP branching strategy (there were no GAMS Syntax errors by the way) - What could be wrong here?

What version of CPLEX do you use? How many cores does your machine have?

Can you please show us the full CPLEX output you get?

Did you check with GAMS people that this is the correct way to pass options to CPLEX?