Ventana software support forum

Since I downloaded Vensim DSS v7.2 I have experienced the 'Memory allocation failure - subblock' fatal error when trying to load some of my models. The problem is not a matter of model size. My largest model loads OK. Other, smaller, models, do not.

All my models loaded without problem before I downloaded Vensim DSS v7.2.

Has anybody else encountered this problem? Does anybody know how to fix it?

If you view the task manager, how much memory is Vensim using when it crashes?

And are you certain that this is not related to one of your external functions?

Vensim is using 12.3MB of memory when it displays the memory allocation failure message. My external functions are stable, syntactically correct and with working DLLs. All these models run normally, except on DSS 7.2.

If you change the vensim_external function and return 0, what happens?

CFUNCTION int VEFCC vensim_external(VV *val,int nval,int funcid)
{
val[0].val = 0 ;
return(1) ; /* a 1 return value signals vensim of successful completion */
}