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