Hi,

To speed op my calculations I implemented an external function to solve sparse matrices [Ax=b stuff, with A sparse] (using CSpares of Tim Davis). The syntax I used is quite straigthforward.

function FunctionName
input a;
input b;
...

output result;

external "C";
  annotation(Include="#include <HeaderFile.h>", Library={"LibraryFile"});

end FunctionName;

The function does what it has to do. At least for small matrices (lets say size(b)=400 and A = 400x400 but square) . When I increase the matrix size (within the C-code: size(b)=40000 and A = 40000x40000) OpenModelica takes a tremendous long time to compile the code. (I tried for 2 hours, but even after this time OpenModelica had not finished yet)
This is very strange, because when I compile the c-function with gcc to an .exe-file it only needs a few seconds to give me the solution (of the case where size(b)=40000 and A = 40000x40000). Has anyone any idea why OpenModelica needs so much time? Is it because it has to process the solution-vector x?

Kind regards
Ruben G

Ps. To test this I used a model which only uses this function. So basically OpenModelica only needs to call this function, give it a few doubles (to specify the matrix size) as an input (the matrices are build inside the c-function) and receive the solution vector x (from Ax=b) as an output.