Stopping Gurobi prints on stdout

[Akhil]

I am using Gurobi 4.0 (academic license) on Linux. Is there any way to
stop the printouts that the gurobi does on the standard output while
solving the LP?
The prints on the screen/ file affect performance of the program. Can
we stop it?

[Greg Glockner]

Set the OutputFlag parameter to 0. See:

http://www.gurobi.com/doc/40/refman/node572.html

[Kris]

Hi Greg

Documentation
http://www.gurobi.com/doc/40/refman/node572.html
is wrong with regard to OutputFlag:

"OutputFlag int 1 0 1 Enables or disables solver output."

This says that the optimal solution itself is suppressed.
(It does not say that stdout is suppressed.)

The balance of parameter documentation, on that page, is incomplete.

Kris

[Greg Glockner]

> "OutputFlag int 1 0 1 Enables or disables solver output."
>
> This says that the optimal solution itself is suppressed.
> (It does not say that stdout is suppressed.)

"Solver output" indicates the log information, not the solution values.
OutputFlag = 1 means that the log information is written to the screen (stdout).
OutputFlag = 0 means that the log information is not written to the screen (stdout).

[Akhil]

Can anyone please tell what exactly I need to do to reset this flag. I
tried some options but I am getting compiler errors e.g.

model.set(GRB_IntParam_OutputFlag, 0); -- this does not work

Thanks,
AKhil

[Zonghao Gu]

Try
model.getEnv().set(GRB_IntParam_OutputFlag, 0);

[Akhil]

Thanks a lot, that worked!!

On Dec 17, 6:38 pm, Zonghao Gu <g...@gurobi.com> wrote:
> Try
> model.getEnv().set(GRB_IntParam_OutputFlag, 0);
>

[G Abouelseoud]

I have the same problem. However, despite trying suggested solutions, I still keep getting the message:

Changed value of parameter TimeLimit to 60.0

   Prev: 1e+100  Min: 0.0  Max: 1e+100  Default: 1e+100

How can I stop such message?

[G Abouelseoud]

I found a solution at: https://github.com/opencobra/cobrapy/issues/248

simply the verbosity stopping should be at the very start of the code so that no messages are displayed as result of running future commands.