1 static const char help[] = "Test PetscSF with MPI large count (more than 2 billion elements in messages)\n\n"; 2 3 #include <petscsys.h> 4 #include <petscsf.h> 5 6 int main(int argc,char **argv) 7 { 8 PetscErrorCode ierr; 9 PetscSF sf; 10 PetscInt i,nroots,nleaves; 11 PetscInt n = (1ULL<<31) + 1024; /* a little over 2G elements */ 12 PetscSFNode *iremote = NULL; 13 PetscMPIInt rank,size; 14 char *rootdata=NULL,*leafdata=NULL; 15 Vec x,y; 16 VecScatter vscat; 17 PetscInt rstart,rend; 18 IS ix; 19 const PetscScalar *xv; 20 21 ierr = PetscInitialize(&argc,&argv,NULL,help);if (ierr) return ierr; 22 CHKERRMPI(MPI_Comm_rank(PETSC_COMM_WORLD,&rank)); 23 CHKERRMPI(MPI_Comm_size(PETSC_COMM_WORLD,&size)); 24 PetscCheckFalse(size != 2,PETSC_COMM_WORLD,PETSC_ERR_WRONG_MPI_SIZE,"The test can only run with two MPI ranks"); 25 26 /* Test PetscSF */ 27 CHKERRQ(PetscSFCreate(PETSC_COMM_WORLD,&sf)); 28 CHKERRQ(PetscSFSetFromOptions(sf)); 29 30 if (!rank) { 31 nroots = n; 32 nleaves = 0; 33 } else { 34 nroots = 0; 35 nleaves = n; 36 CHKERRQ(PetscMalloc1(nleaves,&iremote)); 37 for (i=0; i<nleaves; i++) { 38 iremote[i].rank = 0; 39 iremote[i].index = i; 40 } 41 } 42 CHKERRQ(PetscSFSetGraph(sf,nroots,nleaves,NULL,PETSC_COPY_VALUES,iremote,PETSC_COPY_VALUES)); 43 CHKERRQ(PetscMalloc2(nroots,&rootdata,nleaves,&leafdata)); 44 if (!rank) { 45 memset(rootdata,11,nroots); 46 rootdata[nroots-1] = 12; /* Use a different value at the end */ 47 } 48 49 CHKERRQ(PetscSFBcastBegin(sf,MPI_SIGNED_CHAR,rootdata,leafdata,MPI_REPLACE)); /* rank 0->1, bcast rootdata to leafdata */ 50 CHKERRQ(PetscSFBcastEnd(sf,MPI_SIGNED_CHAR,rootdata,leafdata,MPI_REPLACE)); 51 CHKERRQ(PetscSFReduceBegin(sf,MPI_SIGNED_CHAR,leafdata,rootdata,MPI_SUM)); /* rank 1->0, add leafdata to rootdata */ 52 CHKERRQ(PetscSFReduceEnd(sf,MPI_SIGNED_CHAR,leafdata,rootdata,MPI_SUM)); 53 if (!rank) { 54 PetscCheckFalse(rootdata[0] != 22 || rootdata[nroots-1] != 24,PETSC_COMM_SELF,PETSC_ERR_PLIB,"SF: wrong results"); 55 } 56 57 CHKERRQ(PetscFree2(rootdata,leafdata)); 58 CHKERRQ(PetscFree(iremote)); 59 CHKERRQ(PetscSFDestroy(&sf)); 60 61 /* Test VecScatter */ 62 CHKERRQ(VecCreate(PETSC_COMM_WORLD,&x)); 63 CHKERRQ(VecCreate(PETSC_COMM_WORLD,&y)); 64 CHKERRQ(VecSetSizes(x,rank==0? n : 64,PETSC_DECIDE)); 65 CHKERRQ(VecSetSizes(y,rank==0? 64 : n,PETSC_DECIDE)); 66 CHKERRQ(VecSetFromOptions(x)); 67 CHKERRQ(VecSetFromOptions(y)); 68 69 CHKERRQ(VecGetOwnershipRange(x,&rstart,&rend)); 70 CHKERRQ(ISCreateStride(PETSC_COMM_SELF,rend-rstart,rstart,1,&ix)); 71 CHKERRQ(VecScatterCreate(x,ix,y,ix,&vscat)); 72 73 CHKERRQ(VecSet(x,3.0)); 74 CHKERRQ(VecScatterBegin(vscat,x,y,INSERT_VALUES,SCATTER_FORWARD)); 75 CHKERRQ(VecScatterEnd(vscat,x,y,INSERT_VALUES,SCATTER_FORWARD)); 76 77 CHKERRQ(VecScatterBegin(vscat,y,x,ADD_VALUES,SCATTER_REVERSE)); 78 CHKERRQ(VecScatterEnd(vscat,y,x,ADD_VALUES,SCATTER_REVERSE)); 79 80 CHKERRQ(VecGetArrayRead(x,&xv)); 81 PetscCheckFalse(xv[0] != 6.0,PETSC_COMM_SELF,PETSC_ERR_PLIB,"VecScatter: wrong results"); 82 CHKERRQ(VecRestoreArrayRead(x,&xv)); 83 CHKERRQ(VecDestroy(&x)); 84 CHKERRQ(VecDestroy(&y)); 85 CHKERRQ(VecScatterDestroy(&vscat)); 86 CHKERRQ(ISDestroy(&ix)); 87 88 ierr = PetscFinalize(); 89 return ierr; 90 } 91 92 /**TEST 93 test: 94 requires: defined(PETSC_HAVE_MPI_LARGE_COUNT) defined(PETSC_USE_64BIT_INDICES) 95 TODO: need a machine with big memory (~150GB) to run the test 96 nsize: 2 97 args: -sf_type {{basic neighbor}} 98 99 TEST**/ 100