Actual source code: ex100.c
petsc-3.12.4 2020-02-04
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      1:  #include <petscksp.h>

      3: /* ------------------------------------------------------- */

      5: PetscErrorCode RunTest(void)
      6: {
      7:   PetscInt       N    = 100, its = 0;
      8:   PetscBool      draw = PETSC_FALSE, test = PETSC_FALSE;
      9:   PetscReal      rnorm;
     10:   Mat            A;
     11:   Vec            b,x,r;
     12:   KSP            ksp;
     13:   PC             pc;

     18:   PetscOptionsGetInt(NULL,NULL,"-N",&N,NULL);
     19:   PetscOptionsGetBool(NULL,NULL,"-test",&test,NULL);
     20:   PetscOptionsGetBool(NULL,NULL,"-draw",&draw,NULL);

     22:   MatCreate(PETSC_COMM_WORLD,&A);
     23:   MatSetSizes(A,PETSC_DECIDE,PETSC_DECIDE,N,N);
     24:   MatSetType(A,MATPYTHON);
     25:   MatPythonSetType(A,"example100.py:Laplace1D");
     26:   MatSetUp(A);

     28:   MatCreateVecs(A,&x,&b);
     29:   VecSet(b,1);

     31:   KSPCreate(PETSC_COMM_WORLD,&ksp);
     32:   KSPSetType(ksp,KSPPYTHON);
     33:   KSPPythonSetType(ksp,"example100.py:ConjGrad");

     35:   KSPGetPC(ksp,&pc);
     36:   PCSetType(pc,PCPYTHON);
     37:   PCPythonSetType(pc,"example100.py:Jacobi");

     39:   KSPSetOperators(ksp,A,A);
     40:   KSPSetFromOptions(ksp);
     41:   KSPSolve(ksp,b,x);

     43:   if (test) {
     44:     KSPGetTotalIterations(ksp,&its);
     45:     PetscPrintf(PETSC_COMM_WORLD,"Number of KSP iterations = %D\n", its);
     46:   } else {
     47:     VecDuplicate(b,&r);
     48:     MatMult(A,x,r);
     49:     VecAYPX(r,-1,b);
     50:     VecNorm(r,NORM_2,&rnorm);
     51:     PetscPrintf(PETSC_COMM_WORLD,"error norm = %g\n",rnorm);
     52:     VecDestroy(&r);
     53:   }

     55:   if (draw) {
     56:     VecView(x,PETSC_VIEWER_DRAW_WORLD);
     57:     PetscSleep(2);
     58:   }

     60:   VecDestroy(&x);
     61:   VecDestroy(&b);
     62:   MatDestroy(&A);
     63:   KSPDestroy(&ksp);

     65:   return(0);
     66: }

     68: /* ------------------------------------------------------- */

     70: static char help[] = "Python-implemented Mat/KSP/PC.\n\n";

     72: /*
     73: #define PYTHON_EXE "python2.5"
     74: #define PYTHON_LIB "/usr/lib/libpython2.5"
     75: */

     77: #if !defined(PYTHON_EXE)
     78: #define PYTHON_EXE 0
     79: #endif
     80: #if !defined(PYTHON_LIB)
     81: #define PYTHON_LIB 0
     82: #endif

     84: int main(int argc, char *argv[])
     85: {

     88:   PetscInitialize(&argc,&argv,0,help);if (ierr) return ierr;
     89:   PetscPythonInitialize(PYTHON_EXE,PYTHON_LIB);
     90:   RunTest();PetscPythonPrintError();
     91:   PetscFinalize();
     92:   return ierr;
     93: }

     95: /*TEST

     97:     test:
     98:       args: -ksp_monitor_short
     99:       requires: Section 1.1 Suggested Reading
    100:       localrunfiles: example100.py

    102: TEST*/