1 2 static char help[] = "Test event log of VecScatter with various block sizes\n\n"; 3 4 #include <petscvec.h> 5 6 int main(int argc, char **argv) 7 { 8 PetscInt i, j, low, high, n = 256, N, errors, tot_errors; 9 PetscInt bs = 1, ix[2], iy[2]; 10 PetscMPIInt nproc, rank; 11 PetscScalar *xval; 12 const PetscScalar *yval; 13 Vec x, y; 14 IS isx, isy; 15 VecScatter ctx; 16 const PetscInt niter = 10; 17 PetscLogStage stage1, stage2; 18 PetscLogEvent event1, event2; 19 20 PetscFunctionBegin; 21 PetscFunctionBeginUser; 22 PetscCall(PetscInitialize(&argc, &argv, (char *)0, help)); 23 PetscCall(PetscLogDefaultBegin()); 24 PetscCallMPI(MPI_Comm_size(PETSC_COMM_WORLD, &nproc)); 25 PetscCallMPI(MPI_Comm_rank(PETSC_COMM_WORLD, &rank)); 26 27 PetscCall(PetscLogStageRegister("Scatter(bs=1)", &stage1)); 28 PetscCall(PetscLogEventRegister("VecScatter(bs=1)", PETSC_OBJECT_CLASSID, &event1)); 29 PetscCall(PetscLogStageRegister("Scatter(bs=4)", &stage2)); 30 PetscCall(PetscLogEventRegister("VecScatter(bs=4)", PETSC_OBJECT_CLASSID, &event2)); 31 32 /* Create a parallel vector x and a sequential vector y */ 33 PetscCall(VecCreate(PETSC_COMM_WORLD, &x)); 34 PetscCall(VecSetSizes(x, n, PETSC_DECIDE)); 35 PetscCall(VecSetFromOptions(x)); 36 PetscCall(VecGetOwnershipRange(x, &low, &high)); 37 PetscCall(VecGetSize(x, &N)); 38 PetscCall(VecCreateSeq(PETSC_COMM_SELF, n, &y)); 39 40 /*======================================= 41 test VecScatter with bs = 1 42 ======================================*/ 43 44 /* the code works as if we are going to do 3-point stencil computations on a 1D domain x, 45 which has periodic boundary conditions but the two ghosts are scatterred to beginning of y. 46 */ 47 bs = 1; 48 ix[0] = rank ? low - 1 : N - 1; /* ix[] contains global indices of the two ghost points */ 49 ix[1] = (rank != nproc - 1) ? high : 0; 50 iy[0] = 0; 51 iy[1] = 1; 52 53 PetscCall(ISCreateGeneral(PETSC_COMM_SELF, 2, ix, PETSC_COPY_VALUES, &isx)); 54 PetscCall(ISCreateGeneral(PETSC_COMM_SELF, 2, iy, PETSC_COPY_VALUES, &isy)); 55 PetscCall(VecScatterCreate(x, isx, y, isy, &ctx)); 56 PetscCall(VecScatterSetUp(ctx)); 57 58 PetscCall(PetscLogStagePush(stage1)); 59 PetscCall(PetscLogEventBegin(event1, 0, 0, 0, 0)); 60 errors = 0; 61 for (i = 0; i < niter; i++) { 62 /* set x = 0+i, 1+i, 2+i, ..., N-1+i */ 63 PetscCall(VecGetArray(x, &xval)); 64 for (j = 0; j < n; j++) xval[j] = (PetscScalar)(low + j + i); 65 PetscCall(VecRestoreArray(x, &xval)); 66 /* scatter the ghosts to y */ 67 PetscCall(VecScatterBegin(ctx, x, y, INSERT_VALUES, SCATTER_FORWARD)); 68 PetscCall(VecScatterEnd(ctx, x, y, INSERT_VALUES, SCATTER_FORWARD)); 69 /* check if y has correct values */ 70 PetscCall(VecGetArrayRead(y, &yval)); 71 if ((PetscInt)PetscRealPart(yval[0]) != ix[0] + i) errors++; 72 if ((PetscInt)PetscRealPart(yval[1]) != ix[1] + i) errors++; 73 PetscCall(VecRestoreArrayRead(y, &yval)); 74 } 75 PetscCall(PetscLogEventEnd(event1, 0, 0, 0, 0)); 76 PetscCall(PetscLogStagePop()); 77 78 /* check if we found wrong values on any processors */ 79 PetscCall(MPIU_Allreduce(&errors, &tot_errors, 1, MPIU_INT, MPI_SUM, PETSC_COMM_WORLD)); 80 if (tot_errors) PetscCall(PetscPrintf(PETSC_COMM_WORLD, "Error: wrong values were scatterred in vecscatter with bs = %" PetscInt_FMT "\n", bs)); 81 82 /* print out event log of VecScatter(bs=1) */ 83 if (PetscDefined(USE_LOG)) { 84 PetscLogDouble numMessages, messageLength; 85 PetscEventPerfInfo eventInfo; 86 PetscInt tot_msg, tot_len, avg_len; 87 88 PetscCall(PetscLogEventGetPerfInfo(stage1, event1, &eventInfo)); 89 PetscCall(MPIU_Allreduce(&eventInfo.numMessages, &numMessages, 1, MPIU_PETSCLOGDOUBLE, MPI_SUM, PETSC_COMM_WORLD)); 90 PetscCall(MPIU_Allreduce(&eventInfo.messageLength, &messageLength, 1, MPIU_PETSCLOGDOUBLE, MPI_SUM, PETSC_COMM_WORLD)); 91 tot_msg = (PetscInt)numMessages * 0.5; /* two MPI calls (Send & Recv) per message */ 92 tot_len = (PetscInt)messageLength * 0.5; 93 avg_len = tot_msg ? (PetscInt)(messageLength / numMessages) : 0; 94 /* when nproc > 2, tot_msg = 2*nproc*niter, tot_len = tot_msg*sizeof(PetscScalar)*bs */ 95 PetscCall(PetscPrintf(PETSC_COMM_WORLD, "VecScatter(bs=%" PetscInt_FMT ") has sent out %" PetscInt_FMT " messages, total %" PetscInt_FMT " bytes, with average length %" PetscInt_FMT " bytes\n", bs, tot_msg, tot_len, avg_len)); 96 } 97 98 PetscCall(ISDestroy(&isx)); 99 PetscCall(ISDestroy(&isy)); 100 PetscCall(VecScatterDestroy(&ctx)); 101 102 /*======================================= 103 test VecScatter with bs = 4 104 ======================================*/ 105 106 /* similar to the 3-point stencil above, except that this time a ghost is a block */ 107 bs = 4; /* n needs to be a multiple of bs to make the following code work */ 108 ix[0] = rank ? low / bs - 1 : N / bs - 1; /* ix[] contains global indices of the two ghost blocks */ 109 ix[1] = (rank != nproc - 1) ? high / bs : 0; 110 iy[0] = 0; 111 iy[1] = 1; 112 113 PetscCall(ISCreateBlock(PETSC_COMM_SELF, bs, 2, ix, PETSC_COPY_VALUES, &isx)); 114 PetscCall(ISCreateBlock(PETSC_COMM_SELF, bs, 2, iy, PETSC_COPY_VALUES, &isy)); 115 116 PetscCall(VecScatterCreate(x, isx, y, isy, &ctx)); 117 /* Call SetUp explicitly, otherwise messages in implicit SetUp will be counted in events below */ 118 PetscCall(VecScatterSetUp(ctx)); 119 120 PetscCall(PetscLogStagePush(stage2)); 121 PetscCall(PetscLogEventBegin(event2, 0, 0, 0, 0)); 122 errors = 0; 123 for (i = 0; i < niter; i++) { 124 /* set x = 0+i, 1+i, 2+i, ..., N-1+i */ 125 PetscCall(VecGetArray(x, &xval)); 126 for (j = 0; j < n; j++) xval[j] = (PetscScalar)(low + j + i); 127 PetscCall(VecRestoreArray(x, &xval)); 128 /* scatter the ghost blocks to y */ 129 PetscCall(VecScatterBegin(ctx, x, y, INSERT_VALUES, SCATTER_FORWARD)); 130 PetscCall(VecScatterEnd(ctx, x, y, INSERT_VALUES, SCATTER_FORWARD)); 131 /* check if y has correct values */ 132 PetscCall(VecGetArrayRead(y, &yval)); 133 if ((PetscInt)PetscRealPart(yval[0]) != ix[0] * bs + i) errors++; 134 if ((PetscInt)PetscRealPart(yval[bs]) != ix[1] * bs + i) errors++; 135 PetscCall(VecRestoreArrayRead(y, &yval)); 136 } 137 PetscCall(PetscLogEventEnd(event2, 0, 0, 0, 0)); 138 PetscCall(PetscLogStagePop()); 139 140 /* check if we found wrong values on any processors */ 141 PetscCall(MPIU_Allreduce(&errors, &tot_errors, 1, MPIU_INT, MPI_SUM, PETSC_COMM_WORLD)); 142 if (tot_errors) PetscCall(PetscPrintf(PETSC_COMM_WORLD, "Error: wrong values were scatterred in vecscatter with bs = %" PetscInt_FMT "\n", bs)); 143 144 /* print out event log of VecScatter(bs=4) */ 145 if (PetscDefined(USE_LOG)) { 146 PetscLogDouble numMessages, messageLength; 147 PetscEventPerfInfo eventInfo; 148 PetscInt tot_msg, tot_len, avg_len; 149 150 PetscCall(PetscLogEventGetPerfInfo(stage2, event2, &eventInfo)); 151 PetscCall(MPIU_Allreduce(&eventInfo.numMessages, &numMessages, 1, MPIU_PETSCLOGDOUBLE, MPI_SUM, PETSC_COMM_WORLD)); 152 PetscCall(MPIU_Allreduce(&eventInfo.messageLength, &messageLength, 1, MPIU_PETSCLOGDOUBLE, MPI_SUM, PETSC_COMM_WORLD)); 153 tot_msg = (PetscInt)numMessages * 0.5; /* two MPI calls (Send & Recv) per message */ 154 tot_len = (PetscInt)messageLength * 0.5; 155 avg_len = tot_msg ? (PetscInt)(messageLength / numMessages) : 0; 156 /* when nproc > 2, tot_msg = 2*nproc*niter, tot_len = tot_msg*sizeof(PetscScalar)*bs */ 157 PetscCall(PetscPrintf(PETSC_COMM_WORLD, "VecScatter(bs=%" PetscInt_FMT ") has sent out %" PetscInt_FMT " messages, total %" PetscInt_FMT " bytes, with average length %" PetscInt_FMT " bytes\n", bs, tot_msg, tot_len, avg_len)); 158 } 159 160 PetscCall(PetscPrintf(PETSC_COMM_WORLD, "Program finished\n")); 161 PetscCall(ISDestroy(&isx)); 162 PetscCall(ISDestroy(&isy)); 163 PetscCall(VecScatterDestroy(&ctx)); 164 PetscCall(VecDestroy(&x)); 165 PetscCall(VecDestroy(&y)); 166 PetscCall(PetscFinalize()); 167 return 0; 168 } 169 170 /*TEST 171 172 test: 173 nsize: 4 174 args: 175 requires: double defined(PETSC_USE_LOG) 176 177 TEST*/ 178