CBC ignores attempts to silence it.

[freemin7]

Dependencies:

 pkg> st
      Status `~/Projekte/Julia/MILP_benchmark/Project.toml`
  [9961bab8] Cbc v0.8.1
  [60bf3e95] GLPK v0.14.12
  [4076af6c] JuMP v0.21.10

Code

using JuMP
import Cbc

function example_transp(factory)
    ORIG = ["GARY", "CLEV", "PITT"]
    DEST = ["FRA", "DET", "LAN", "WIN", "STL", "FRE", "LAF"]
    supply = [1_400, 2_600, 2_900]
    demand = [900, 1_200, 600, 400, 1_700, 1_100, 1_000]
    cost = [
        39 14 11 14 16 82 8
        27 9 12 9 26 95 17
        24 14 17 13 28 99 20
    ]
    model = Model(factory)
    set_silent(model)
    @variable(model, trans[1:length(ORIG), 1:length(DEST)] >= 0)
    @objective(
        model,
        Min,
        sum(
            cost[i, j] * trans[i, j] for i in 1:length(ORIG),
            j in 1:length(DEST)
        )
    )
    @constraints(
        model,
        begin
            [i in 1:length(ORIG)], sum(trans[i, :]) == supply[i]
            [j in 1:length(DEST)], sum(trans[:, j]) == demand[j]
        end
    )
    optimize!(model)
    if termination_status(model) == MOI.OPTIMAL
    	println("transp ",solver_name(model)," ", solve_time(model))
    else
    	println("transp ",solver_name(model)," failed")
    end
    return
end

example_transp(with_optimizer(Cbc.Optimizer, logLevel = 0))

This outputs:

Presolve 10 (0) rows, 21 (0) columns and 42 (0) elements
0  Obj 0 Primal inf 13800 (10)
13  Obj 196200
Optimal - objective value 196200
Optimal objective 196200 - 13 iterations time 0.002
transp COIN Branch-and-Cut (Cbc) 0.000453948974609375

when i only expected the last line.

[odow]

Closing as duplicate of #168