1: static const char help[] = "Test ParMETIS handling of negative weights.\n\n";

  3: /* Test contributed by John Fettig */

  5: /*
  6:  * This file implements two tests for a bug reported in ParMETIS. These tests are not expected to pass without the
  7:  * following two patches.
  8:  *
  9:  * http://petsc.cs.iit.edu/petsc/externalpackages/parmetis-4.0.2/rev/2dd2eae596ac
 10:  * http://petsc.cs.iit.edu/petsc/externalpackages/parmetis-4.0.2/rev/1c2b9fe39201
 11:  *
 12:  * The bug was reported upstream, but has received no action so far.
 13:  *
 14:  * http://glaros.dtc.umn.edu/gkhome/node/837
 15:  *
 16:  */

 18:  #include <petscsys.h>
 19: #include <parmetis.h>

 21: #define CHKERRQPARMETIS(n) \
 22:   if (n == METIS_ERROR_INPUT) SETERRQ(PETSC_COMM_SELF,PETSC_ERR_LIB,"ParMETIS error due to wrong inputs and/or options"); \
 23:   else if (n == METIS_ERROR_MEMORY) SETERRQ(PETSC_COMM_SELF,PETSC_ERR_LIB,"ParMETIS error due to insufficient memory"); \
 24:   else if (n == METIS_ERROR) SETERRQ(PETSC_COMM_SELF,PETSC_ERR_LIB,"ParMETIS general error"); \

 26: int main(int argc, char *argv[])
 27: {
 29:   PetscBool      flg;
 30:   PetscMPIInt    rank, size;
 31:   int            i, status;
 32:   idx_t          ni,isize,*vtxdist, *xadj, *adjncy, *vwgt, *part;
 33:   idx_t          wgtflag=0, numflag=0, ncon=1, ndims=3, edgecut=0;
 34:   idx_t          options[5];
 35:   real_t         *xyz, *tpwgts, ubvec[1];
 36:   MPI_Comm       comm;
 37:   FILE           *fp;
 38:   char           fname[PETSC_MAX_PATH_LEN],prefix[PETSC_MAX_PATH_LEN] = "";

 40:   PetscInitialize(&argc,&argv,NULL,help);if (ierr) return ierr;
 41: #if defined(PETSC_USE_64BIT_INDICES)
 42:   PetscPrintf(PETSC_COMM_WORLD,"This example only works with 32 bit indices\n");
 43:   PetscFinalize();
 44:   return ierr;
 45: #endif
 46:   MPI_Comm_rank(PETSC_COMM_WORLD,&rank);
 47:   MPI_Comm_size(PETSC_COMM_WORLD,&size);

 49:   PetscOptionsBegin(PETSC_COMM_WORLD,NULL,"Parmetis test options","");
 50:   PetscOptionsString("-prefix","Path and prefix of test file","",prefix,prefix,sizeof(prefix),&flg);
 51:   if (!flg) SETERRQ(PETSC_COMM_WORLD,PETSC_ERR_USER,"Must specify -prefix");
 52:   PetscOptionsEnd();

 54:   PetscMalloc1(size+1,&vtxdist);

 56:   PetscSNPrintf(fname,sizeof(fname),"%s.%d.graph",prefix,rank);

 58:   PetscFOpen(PETSC_COMM_SELF,fname,"r",&fp);

 60:   fread(vtxdist, sizeof(idx_t), size+1, fp);

 62:   ni = vtxdist[rank+1]-vtxdist[rank];

 64:   PetscMalloc1(ni+1,&xadj);

 66:   fread(xadj, sizeof(idx_t), ni+1, fp);

 68:   PetscMalloc1(xadj[ni],&adjncy);

 70:   for (i=0; i<ni; i++) fread(&adjncy[xadj[i]], sizeof(idx_t), xadj[i+1]-xadj[i], fp);

 72:   PetscFClose(PETSC_COMM_SELF,fp);

 74:   PetscSNPrintf(fname,sizeof(fname),"%s.%d.graph.xyz",prefix,rank);
 75:   PetscFOpen(PETSC_COMM_SELF,fname,"r",&fp);

 77:   PetscMalloc3(ni*ndims,&xyz,ni,&part,size,&tpwgts);

 79:   fread(xyz, sizeof(real_t), ndims*ni, fp);
 80:   PetscFClose(PETSC_COMM_SELF,fp);

 82:   vwgt = NULL;

 84:   for (i = 0; i < size; i++) tpwgts[i] = 1. / size;
 85:   isize = size;

 87:   ubvec[0]   = 1.05;
 88:   options[0] = 1;
 89:   options[1] = 2;
 90:   options[2] = 15;
 91:   options[3] = 0;
 92:   options[4] = 0;

 94:   MPI_Comm_dup(MPI_COMM_WORLD, &comm);
 95:   status = ParMETIS_V3_PartGeomKway(vtxdist, xadj, adjncy, vwgt, NULL, &wgtflag, &numflag, &ndims, xyz, &ncon, &isize, tpwgts, ubvec,options, &edgecut, part, &comm);CHKERRQPARMETIS(status);
 96:   MPI_Comm_free(&comm);

 98:   PetscFree(vtxdist);
 99:   PetscFree(xadj);
100:   PetscFree(adjncy);
101:   PetscFree3(xyz,part,tpwgts);
102:   PetscFinalize();
103:   return ierr;
104: }