<html><head><meta http-equiv="Content-Type" content="text/html charset=us-ascii"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">Hi, <div class=""><br class=""></div><div class=""><span style="background-color: rgb(255, 255, 255);" class=""><font color="#222222" face="Helvetica, Arial, sans-serif" class=""><span style="font-size: 14px;" class="">I am using </span></font></span>scipoptsuite-4.0.0 <span style="font-size: 14px; color: rgb(34, 34, 34); font-family: Helvetica, Arial, sans-serif; background-color: rgb(255, 255, 255);" class="">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.</span></div><div class=""><span style="color: rgb(34, 34, 34); font-family: Helvetica, Arial, sans-serif; font-size: 14px; background-color: rgb(255, 255, 255);" class=""><br class=""></span></div><div class=""><span style="color: rgb(34, 34, 34); font-family: Helvetica, Arial, sans-serif; font-size: 14px; background-color: rgb(255, 255, 255);" class="">Here is the test code test.jl: </span></div><div class=""><span style="color: rgb(34, 34, 34); font-family: Helvetica, Arial, sans-serif; font-size: 14px;" class=""><br class=""></span></div><div class=""><span style="color: rgb(34, 34, 34); font-family: Helvetica, Arial, sans-serif; font-size: 14px;" class="">using JuMP, Gurobi, SCIP</span></div><div class=""><p style="color: rgb(34, 34, 34); font-family: Helvetica, Arial, sans-serif; font-size: 14px;" class="">function test(iter)<br class="">for i = 1:iter<br class=""> m= Model()<br class=""> nvar = 1000<br class=""><span class="mention"> @variable</span>(m, 0<=x[1:nvar]<=1)<br class=""><span class="mention"> @constraint</span>(m, con[i in 1:(nvar-2)], x[i]+x[i+1]<=1)<br class=""><span class="mention"> @objective</span>(m, :Min, sum{(x[i]+x[i+2])^2, i in 1:(nvar-2)})<br class=""> m.solver=SCIPSolver("display/verblevel", 0)<br class=""><span class="hashtag"> #m</span>.solver=GurobiSolver(LogToConsole=0,OutputFlag=0)<br class=""> solve(m)<br class="">end<br class="">end<br class="">test(10)</p><div class=""><br class=""></div><div class="">I <span style="color: rgb(34, 34, 34); font-family: Helvetica, Arial, sans-serif; font-size: 14px; background-color: rgb(255, 255, 255);" class="">monitored the peak memory usage using /usr/bin/time -v julia test.jl</span></div><div class=""><p style="color: rgb(34, 34, 34); font-family: Helvetica, Arial, sans-serif; font-size: 14px;" class="">For SCIP, I got <br class="">test(1) <br class="">Maximum resident set size (kbytes): 234312<br class="">test(10)<br class="">Maximum resident set size (kbytes): 803168<br class="">test(100)<br class="">Maximum resident set size (kbytes): 6441800</p><p style="color: rgb(34, 34, 34); font-family: Helvetica, Arial, sans-serif; font-size: 14px;" class="">For Gurobi, I got<br class="">test(1) <br class="">Maximum resident set size (kbytes): 174972<br class="">test(10)<br class="">Maximum resident set size (kbytes): 187388<br class="">test(100)<br class="">Maximum resident set size (kbytes): 263780</p><div class=""><span style="color: rgb(34, 34, 34); font-family: Helvetica, Arial, sans-serif; font-size: 14px; background-color: rgb(255, 255, 255);" class="">So for Gurobi, the result is as expected, but for SCIP the peak memory usage do increases dramatically. Can anyone check this issue? Thanks.</span></div></div><div class=""><span style="color: rgb(34, 34, 34); font-family: Helvetica, Arial, sans-serif; font-size: 14px; background-color: rgb(255, 255, 255);" class=""><br class=""></span></div><div class=""><span style="color: rgb(34, 34, 34); font-family: Helvetica, Arial, sans-serif; font-size: 14px; background-color: rgb(255, 255, 255);" class=""><br class=""></span></div><div class=""><br class=""></div></div><div class=""><br class=""></div><div class=""><br class=""></div></body></html>