1 #include <../src/vec/is/sf/impls/basic/allgatherv/sfallgatherv.h> 2 3 /* Reuse the type. The difference is some fields (i.e., displs, recvcounts) are not used in Allgather on rank != 0, which is not a big deal */ 4 typedef PetscSF_Allgatherv PetscSF_Allgather; 5 6 PETSC_INTERN PetscErrorCode PetscSFBcastBegin_Gather(PetscSF,MPI_Datatype,PetscMemType,const void*,PetscMemType,void*,MPI_Op); 7 8 PetscErrorCode PetscSFSetUp_Allgather(PetscSF sf) 9 { 10 PetscInt i; 11 PetscSF_Allgather *dat = (PetscSF_Allgather*)sf->data; 12 13 PetscFunctionBegin; 14 for (i=PETSCSF_LOCAL; i<=PETSCSF_REMOTE; i++) { 15 sf->leafbuflen[i] = 0; 16 sf->leafstart[i] = 0; 17 sf->leafcontig[i] = PETSC_TRUE; 18 sf->leafdups[i] = PETSC_FALSE; 19 dat->rootbuflen[i] = 0; 20 dat->rootstart[i] = 0; 21 dat->rootcontig[i] = PETSC_TRUE; 22 dat->rootdups[i] = PETSC_FALSE; 23 } 24 25 sf->leafbuflen[PETSCSF_REMOTE] = sf->nleaves; 26 dat->rootbuflen[PETSCSF_REMOTE] = sf->nroots; 27 sf->persistent = PETSC_FALSE; 28 sf->nleafreqs = 0; /* MPI collectives only need one request. We treat it as a root request. */ 29 dat->nrootreqs = 1; 30 PetscFunctionReturn(0); 31 } 32 33 static PetscErrorCode PetscSFBcastBegin_Allgather(PetscSF sf,MPI_Datatype unit,PetscMemType rootmtype,const void *rootdata,PetscMemType leafmtype,void *leafdata,MPI_Op op) 34 { 35 PetscSFLink link; 36 PetscMPIInt sendcount; 37 MPI_Comm comm; 38 void *rootbuf = NULL,*leafbuf = NULL; /* buffer seen by MPI */ 39 MPI_Request *req; 40 41 PetscFunctionBegin; 42 PetscCall(PetscSFLinkCreate(sf,unit,rootmtype,rootdata,leafmtype,leafdata,op,PETSCSF_BCAST,&link)); 43 PetscCall(PetscSFLinkPackRootData(sf,link,PETSCSF_REMOTE,rootdata)); 44 PetscCall(PetscSFLinkCopyRootBufferInCaseNotUseGpuAwareMPI(sf,link,PETSC_TRUE/* device2host before sending */)); 45 PetscCall(PetscObjectGetComm((PetscObject)sf,&comm)); 46 PetscCall(PetscMPIIntCast(sf->nroots,&sendcount)); 47 PetscCall(PetscSFLinkGetMPIBuffersAndRequests(sf,link,PETSCSF_ROOT2LEAF,&rootbuf,&leafbuf,&req,NULL)); 48 PetscCall(PetscSFLinkSyncStreamBeforeCallMPI(sf,link,PETSCSF_ROOT2LEAF)); 49 PetscCallMPI(MPIU_Iallgather(rootbuf,sendcount,unit,leafbuf,sendcount,unit,comm,req)); 50 PetscFunctionReturn(0); 51 } 52 53 static PetscErrorCode PetscSFReduceBegin_Allgather(PetscSF sf,MPI_Datatype unit,PetscMemType leafmtype,const void *leafdata,PetscMemType rootmtype,void *rootdata,MPI_Op op) 54 { 55 PetscSFLink link; 56 PetscInt rstart; 57 MPI_Comm comm; 58 PetscMPIInt rank,count,recvcount; 59 void *rootbuf = NULL,*leafbuf = NULL; /* buffer seen by MPI */ 60 PetscSF_Allgather *dat = (PetscSF_Allgather*)sf->data; 61 MPI_Request *req; 62 63 PetscFunctionBegin; 64 PetscCall(PetscSFLinkCreate(sf,unit,rootmtype,rootdata,leafmtype,leafdata,op,PETSCSF_REDUCE,&link)); 65 if (op == MPI_REPLACE) { 66 /* REPLACE is only meaningful when all processes have the same leafdata to reduce. Therefore copy from local leafdata is fine */ 67 PetscCall(PetscLayoutGetRange(sf->map,&rstart,NULL)); 68 PetscCall((*link->Memcpy)(link,rootmtype,rootdata,leafmtype,(const char*)leafdata+(size_t)rstart*link->unitbytes,(size_t)sf->nroots*link->unitbytes)); 69 if (PetscMemTypeDevice(leafmtype) && PetscMemTypeHost(rootmtype)) PetscCall((*link->SyncStream)(link)); /* Sync the device to host memcpy */ 70 } else { 71 PetscCall(PetscObjectGetComm((PetscObject)sf,&comm)); 72 PetscCallMPI(MPI_Comm_rank(comm,&rank)); 73 PetscCall(PetscSFLinkPackLeafData(sf,link,PETSCSF_REMOTE,leafdata)); 74 PetscCall(PetscSFLinkCopyLeafBufferInCaseNotUseGpuAwareMPI(sf,link,PETSC_TRUE/* device2host before sending */)); 75 PetscCall(PetscSFLinkGetMPIBuffersAndRequests(sf,link,PETSCSF_LEAF2ROOT,&rootbuf,&leafbuf,&req,NULL)); 76 PetscCall(PetscMPIIntCast(dat->rootbuflen[PETSCSF_REMOTE],&recvcount)); 77 if (rank == 0 && !link->leafbuf_alloc[PETSCSF_REMOTE][link->leafmtype_mpi]) { 78 PetscCall(PetscSFMalloc(sf,link->leafmtype_mpi,sf->leafbuflen[PETSCSF_REMOTE]*link->unitbytes,(void**)&link->leafbuf_alloc[PETSCSF_REMOTE][link->leafmtype_mpi])); 79 } 80 if (rank == 0 && link->leafbuf_alloc[PETSCSF_REMOTE][link->leafmtype_mpi] == leafbuf) leafbuf = MPI_IN_PLACE; 81 PetscCall(PetscMPIIntCast(sf->nleaves*link->bs,&count)); 82 PetscCall(PetscSFLinkSyncStreamBeforeCallMPI(sf,link,PETSCSF_LEAF2ROOT)); 83 PetscCallMPI(MPI_Reduce(leafbuf,link->leafbuf_alloc[PETSCSF_REMOTE][link->leafmtype_mpi],count,link->basicunit,op,0,comm)); /* Must do reduce with MPI builltin datatype basicunit */ 84 PetscCallMPI(MPIU_Iscatter(link->leafbuf_alloc[PETSCSF_REMOTE][link->leafmtype_mpi],recvcount,unit,rootbuf,recvcount,unit,0/*rank 0*/,comm,req)); 85 } 86 PetscFunctionReturn(0); 87 } 88 89 static PetscErrorCode PetscSFBcastToZero_Allgather(PetscSF sf,MPI_Datatype unit,PetscMemType rootmtype,const void *rootdata,PetscMemType leafmtype,void *leafdata) 90 { 91 PetscSFLink link; 92 PetscMPIInt rank; 93 94 PetscFunctionBegin; 95 PetscCall(PetscSFBcastBegin_Gather(sf,unit,rootmtype,rootdata,leafmtype,leafdata,MPI_REPLACE)); 96 PetscCall(PetscSFLinkGetInUse(sf,unit,rootdata,leafdata,PETSC_OWN_POINTER,&link)); 97 PetscCall(PetscSFLinkFinishCommunication(sf,link,PETSCSF_ROOT2LEAF)); 98 PetscCallMPI(MPI_Comm_rank(PetscObjectComm((PetscObject)sf),&rank)); 99 if (rank == 0 && PetscMemTypeDevice(leafmtype) && !sf->use_gpu_aware_mpi) { 100 PetscCall((*link->Memcpy)(link,PETSC_MEMTYPE_DEVICE,leafdata,PETSC_MEMTYPE_HOST,link->leafbuf[PETSCSF_REMOTE][PETSC_MEMTYPE_HOST],sf->leafbuflen[PETSCSF_REMOTE]*link->unitbytes)); 101 } 102 PetscCall(PetscSFLinkReclaim(sf,&link)); 103 PetscFunctionReturn(0); 104 } 105 106 PETSC_INTERN PetscErrorCode PetscSFCreate_Allgather(PetscSF sf) 107 { 108 PetscSF_Allgather *dat = (PetscSF_Allgather*)sf->data; 109 110 PetscFunctionBegin; 111 sf->ops->BcastEnd = PetscSFBcastEnd_Basic; 112 sf->ops->ReduceEnd = PetscSFReduceEnd_Allgatherv; 113 114 /* Inherit from Allgatherv */ 115 sf->ops->Reset = PetscSFReset_Allgatherv; 116 sf->ops->Destroy = PetscSFDestroy_Allgatherv; 117 sf->ops->FetchAndOpBegin = PetscSFFetchAndOpBegin_Allgatherv; 118 sf->ops->FetchAndOpEnd = PetscSFFetchAndOpEnd_Allgatherv; 119 sf->ops->GetRootRanks = PetscSFGetRootRanks_Allgatherv; 120 sf->ops->CreateLocalSF = PetscSFCreateLocalSF_Allgatherv; 121 sf->ops->GetGraph = PetscSFGetGraph_Allgatherv; 122 sf->ops->GetLeafRanks = PetscSFGetLeafRanks_Allgatherv; 123 124 /* Allgather stuff */ 125 sf->ops->SetUp = PetscSFSetUp_Allgather; 126 sf->ops->BcastBegin = PetscSFBcastBegin_Allgather; 127 sf->ops->ReduceBegin = PetscSFReduceBegin_Allgather; 128 sf->ops->BcastToZero = PetscSFBcastToZero_Allgather; 129 130 PetscCall(PetscNewLog(sf,&dat)); 131 sf->data = (void*)dat; 132 PetscFunctionReturn(0); 133 } 134