Originally posted by: qtbgo

Hi, I build a CP model using OPL. When solving big problems, it takes a long time to extract the model. Pls see the attached, 59% of time is spent on extract.

My questions are:

1  cp.info.SolveTime doesn't include extract time, how to output all times(including extract time) needed to solve a problem? Do I need to report extract time in academic papers?

2 what is extract time? If I use c++ concert instead of OPL, can extract time be reduced?

Thanks in advance. 

Hi

1)

you could do

float time0;

float time1;

and then in your code

execute
{
time0 = 

new Date();
}

and later 


execute
{
time1 = 

new Date();

writeln(
"total time is ", time1-time0);
} 
For academic papers, I would use total time.

2) Extraction means building the constraints out of concert or OPL. If you have a working model with data, you could attach it here so that someone can have a look and tell you how to improve.

Regards