Subscript and Delay

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rolando
Member
Posts: 22
Joined: Wed Dec 08, 2004 6:11 pm

Subscript and Delay

Post by rolando »

Hi,

I'm using variables with subscripts, delays in some variables and I'm reading from Excel some constants(GET XLS CONSTSANTS), (TIME STEP:1, INITIAL TIME:1 and FINAL TIME:6000.

My question is:
Is normal that Vensim spend like 3 minutes just to run the model?

I'm using win XP, and 512 MB RAM....

thank's in advance
bob@vensim.com
Senior Member
Posts: 1107
Joined: Wed Mar 12, 2003 2:46 pm

Post by bob@vensim.com »

subscripts can very quickly make a model very big. To get an idea of size use Models>Setting and click on the Info/Pswd tab.

You can also watch where the model is slow. If it is slow to start the simulation probably the GET XLS CONSTANTS functions are bogging things down, if it finishes but takes forever at the last time then it is storing results (look into using a savelist). If it is slow passing through time then it is just size. Compiling will help.
rolando
Member
Posts: 22
Joined: Wed Dec 08, 2004 6:11 pm

The cause of the problem....

Post by rolando »

Hi,

The model is slow when starts.
I run the model in different machines, and what I get is that it behaves faster on other machines, so I think that in this particular computer is the problem. (with XLS GET CONSTANTS), because if introduce the data manually, Vensim run the model very fast.

Thank's for the post.
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