update FAQ ref #325

jump-dev · Nov 30, 2014 · 3f4f8bf · 3f4f8bf · joehuchette · Nov 30, 2014
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@@ -14,4 +14,19 @@ setValue(x[3], 2.0)
 
 If you don't set the value of a variable, the behavior is solver-dependent. Some solvers attempt to "complete" solutions that aren't completely specified.
 
+**Q: How can I suppress output in a solver-independent way?**
 
+A: JuMP does not currently support generic parameters independent of the chosen solver object. To suppress output with Gurobi, for example, one would say
+
+```julia
+m = Model(solver=GurobiSolver(OutputFlag=0))
+```
+
+When a solver is not specified, i.e., the model is created with ``m = Model()``, there's no option to suppress output. A workaround is to redirect STDOUT before and after the call to ``solve(m)``:
+
+```julia
+TT = STDOUT # save original STDOUT stream
+redirect_stdout()
+solve(m)
+redirect_stdout(TT) # restore STDOUT
+```