Each time the program runs, the speed is very slow, and the following happens

Error umpfack umfpack_zl_symbolic status -1

Error umpfack umfpack_zl_numeric status -4

Error umfpack_di_solve status -3

why?

The error is

#define UMFPACK_ERROR_out_of_memory (-1)

This is with why it is so slow.

Thank you, professor. Is there any solution to this problem?

load “UMFPACK64”;

…

problem kg2(psai2,u,solver=“UMFPACK64”)=

…

I can’t tell the cause of the error. Is there a reference book？

Using MUMPS,

load “MUMPS”

…

problem kg2(psai2,u,solver=sparsesolver,master=-1)=int2d(Th1)(psai2*u/(dt^2))

…

why?

– Square mesh : nb vertices =40401 , nb triangles = 80000 , nb boundary edges 800

– Square mesh : nb vertices =289 , nb triangles = 512 , nb boundary edges 64

Attempting to use an MPI routine before initializing MPI

yes you are under windows so use load “MUMPS_seq” or use mpi version …

Thank you, professor.

Hi, professor？why？

(nan,nan) != (nan,nan) diff (nan,nan) => Sorry error in Optimization add: (p) int2d(Th,optimize=0)(…)

remark if you add (… , optimize=2) then you remove this check (be careful);

current line = 57

Exec error : In Optimized version

– number :1

Exec error : In Optimized version

– number :1