Setting MemLimit parameter

[YoungFaithful]

Using the MemLimit parameter leads to the following issue:

julia> using JuMP, Gurobi

julia> model = Model(Gurobi.Optimizer)
A JuMP Model
Feasibility problem with:
Variables: 0
Model mode: AUTOMATIC
CachingOptimizer state: EMPTY_OPTIMIZER
Solver name: Gurobi
julia> set_optimizer_attribute(model, "MemLimit", 100)
ERROR: Gurobi Error 10003: Unable to modify parameter MemLimit after environment started
Stacktrace:
 [1] _check_ret
   @ ~/.julia/packages/Gurobi/A9YqC/src/MOI_wrapper/MOI_wrapper.jl:350 [inlined]
 [2] set(model::Gurobi.Optimizer, raw::MathOptInterface.RawOptimizerAttribute, value::Int64)
   @ Gurobi ~/.julia/packages/Gurobi/A9YqC/src/MOI_wrapper/MOI_wrapper.jl:602
 [3] set
   @ ~/.julia/packages/MathOptInterface/eoIu0/src/Bridges/bridge_optimizer.jl:839 [inlined]
 [4] set(model::MathOptInterface.Utilities.CachingOptimizer{MathOptInterface.Bridges.LazyBridgeOptimizer{Gurobi.Optimizer}, MathOptInterface.Utilities.UniversalFallback{MathOptInterface.Utilities.Model{Float64}}}, attr::MathOptInterface.RawOptimizerAttribute, value::Int64)
   @ MathOptInterface.Utilities ~/.julia/packages/MathOptInterface/eoIu0/src/Utilities/cachingoptimizer.jl:979
 [5] set(m::Model, attr::MathOptInterface.RawOptimizerAttribute, value::Int64)
   @ JuMP ~/.julia/packages/JuMP/2IF9U/src/JuMP.jl:1294
 [6] set_optimizer_attribute
   @ ~/.julia/packages/JuMP/2IF9U/src/JuMP.jl:896 [inlined]
 [7] set_optimizer_attribute(model::Model, name::String, value::Int64)
   @ JuMP ~/.julia/packages/JuMP/2IF9U/src/JuMP.jl:870
 [8] top-level scope
   @ REPL[4]:1

julia> 

It is necessary first to set up the Env and then create the model:

Set parameter ServerPassword
Set parameter TokenServer to value "35.242.224.71"
Gurobi.Env(Ptr{Nothing} @0x0000000003d55380, false, 0)

julia> Gurobi.GRBsetintparam(env, "MemLimit", 10)
10007

julia> model = Model(() -> Gurobi.Optimizer(env))
A JuMP Model
Feasibility problem with:
Variables: 0
Model mode: AUTOMATIC
CachingOptimizer state: EMPTY_OPTIMIZER
Solver name: Gurobi

julia> 

Do you see a possibility of changing the package to avoid the workaround?

[mlubin]

Unlikely. Gurobi's documentation instructs users to do the exact workaround you used:

This parameter must be set when the Gurobi environment is first created. You will need to create an empty environment, set the parameter, and then start the environment.

[odow]

Closing because this is intended behavior from Gurobi. The error isn't coming from the design of Gurobi.jl.