[SCIP] possible memory leak in SCIP with JuMP Interface

[Yankai Cao]

Dear Felipe, 

Great! Thanks very much. The new version of SCIP.jl don’t have memory leak. 


Regards,
Yankai

> On Apr 20, 2017, at 9:56 PM, Felipe Serrano <fserranom5 at gmail.com> wrote:
> 
> Dear Yankai
> 
> We already investigated a possible memory leak. Please check
> https://github.com/SCIP-Interfaces/SCIP.jl/issues/33 <https://github.com/SCIP-Interfaces/SCIP.jl/issues/33>
> 
> Please reopen the issue or create a new one there with this problem.
> 
> Best,
> Felipe
> 
> On Thu, Apr 20, 2017 at 11:22 PM, Yankai Cao <yankai.cao at gmail.com <mailto:yankai.cao at gmail.com>> wrote:
> Hi, 
> 
> I am using scipoptsuite-4.0.0 with julia interface SCIP.jl. I  find that if I create and solve models in a for loop using SCIP with models built with JuMP, then the peak memory usage increases dramatically as the number of iterations increases. I would expect the peak memory usage keeps almost constant.
> 
> Here is the test code test.jl: 
> 
> using JuMP, Gurobi, SCIP
> function test(iter)
> for i = 1:iter
>      m= Model()
>      nvar = 1000
>      @variable(m, 0<=x[1:nvar]<=1)
>      @constraint(m, con[i in 1:(nvar-2)], x[i]+x[i+1]<=1)
>      @objective(m, :Min, sum{(x[i]+x[i+2])^2, i in 1:(nvar-2)})
>      m.solver=SCIPSolver("display/verblevel", 0)
>      #m.solver=GurobiSolver(LogToConsole=0,OutputFlag=0)
>      solve(m)
> end
> end
> test(10)
> 
> 
> I monitored the peak memory usage using /usr/bin/time -v julia test.jl
> For SCIP, I got 
> test(1) 
> Maximum resident set size (kbytes): 234312
> test(10)
> Maximum resident set size (kbytes): 803168
> test(100)
> Maximum resident set size (kbytes): 6441800
> 
> For Gurobi, I got
> test(1) 
> Maximum resident set size (kbytes): 174972
> test(10)
> Maximum resident set size (kbytes): 187388
> test(100)
> Maximum resident set size (kbytes): 263780
> 
> So for Gurobi, the result is as expected, but for SCIP the peak memory usage do increases dramatically. Can anyone check this issue? Thanks.
> 
> 
> 
> 
> 
> 
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