Workers in parfor writing to files of a Simulink Model

Hi all, i'm using parfor to running a simulink model. But multiple workers attempt to write to the same file, and i found a solution here: http://www.mathworks.de/de/help/simulink/ug/running-parallel-simulations.html#brsk7nj (A Model with Stateflow, MATLAB Function Block, or Model Block).

But after i changed code, every time when the simulink model is called, will this model new compiled and this makes time of running the model much longer. If i don't change the code, the model running much faster, but after a few loops exits error. So what should i do to make the model run faster and without error.

*|My idea is to create a temp file for each worker, so that the model will only once compiled at the first time it be called. But i still don't known, how to create these files.||*|

 rk1 = [50       75    16.667  33.333 85      50 85     16.777];
rk2 = [85       85    50      75     16.667  85 95     33.333];
rk3 = [16.667   50    33.333  50     16.667  50 33.333 50    ];
rk4 = [33.333   70    16.777  70     85      70 75     85    ];
if matlabpool('size')==0
    matlabpool ('open', 4);
end
parfor j = 1 : length(rk1)
  value(j)= CallSim(rk1(j),rk2(j),ts1(j),ts2(j));
end

 function [value,fflag] = gp(x)
 load('start.mat');

 rk1=x(1);
rk2=x(2);
ts1=x(3);
ts2=x(4);
CONTROLSTRATEGY.reku_SOC         = [rk1 rk2];
CONTROLSTRATEGY.trq_substitution_SOC         = [ts1 ts2];
pr=[];
var = whos;
for i=1:length(var)
    assignin('base', var(i).name, eval(var(i).name));
end

 if rk1>=rk2 || ts1>=ts2
    fflag = 1;
    value = 0;
else
    fflag = 0;
    cwd = pwd;
    addpath(cwd);
    tmpdir = tempname;
    mkdir(tmpdir)
    cd(tmpdir)

    tic;
    sim('XRSimWWPen01');
    toc;

    OUTPUT_ELSYS_BAT_SOC(length(CYCLE.t_soll));
    value=OUTPUT_ENG_consumption(length(CYCLE.t_soll))+OUTPUT_SOC(length(CYCLE.t_soll));
    OUTPUT_ENG_consumption(length(CYCLE.t_soll));
    OUTPUT_SOC(length(CYCLE.t_soll));
    cd(cwd)
    rmdir(tmpdir,'s')
    rmpath(cwd)
end
return;
end