1 2 #include <../src/vec/is/sf/impls/basic/gatherv/sfgatherv.h> 3 4 /* Reuse the type. The difference is some fields (displs, recvcounts) are only significant 5 on rank 0 in Gatherv. On other ranks they are harmless NULL. 6 */ 7 typedef PetscSF_Allgatherv PetscSF_Gatherv; 8 9 PETSC_INTERN PetscErrorCode PetscSFBcastBegin_Gatherv(PetscSF sf, MPI_Datatype unit, PetscMemType rootmtype, const void *rootdata, PetscMemType leafmtype, void *leafdata, MPI_Op op) 10 { 11 PetscSFLink link; 12 PetscMPIInt sendcount; 13 MPI_Comm comm; 14 PetscSF_Gatherv *dat = (PetscSF_Gatherv *)sf->data; 15 void *rootbuf = NULL, *leafbuf = NULL; /* buffer seen by MPI */ 16 MPI_Request *req; 17 18 PetscFunctionBegin; 19 PetscCall(PetscSFLinkCreate(sf, unit, rootmtype, rootdata, leafmtype, leafdata, op, PETSCSF_BCAST, &link)); 20 PetscCall(PetscSFLinkPackRootData(sf, link, PETSCSF_REMOTE, rootdata)); 21 PetscCall(PetscSFLinkCopyRootBufferInCaseNotUseGpuAwareMPI(sf, link, PETSC_TRUE /* device2host before sending */)); 22 PetscCall(PetscObjectGetComm((PetscObject)sf, &comm)); 23 PetscCall(PetscMPIIntCast(sf->nroots, &sendcount)); 24 PetscCall(PetscSFLinkGetMPIBuffersAndRequests(sf, link, PETSCSF_ROOT2LEAF, &rootbuf, &leafbuf, &req, NULL)); 25 PetscCall(PetscSFLinkSyncStreamBeforeCallMPI(sf, link, PETSCSF_ROOT2LEAF)); 26 PetscCallMPI(MPIU_Igatherv(rootbuf, sendcount, unit, leafbuf, dat->recvcounts, dat->displs, unit, 0 /*rank 0*/, comm, req)); 27 PetscFunctionReturn(PETSC_SUCCESS); 28 } 29 30 static PetscErrorCode PetscSFReduceBegin_Gatherv(PetscSF sf, MPI_Datatype unit, PetscMemType leafmtype, const void *leafdata, PetscMemType rootmtype, void *rootdata, MPI_Op op) 31 { 32 PetscSFLink link; 33 PetscMPIInt recvcount; 34 MPI_Comm comm; 35 PetscSF_Gatherv *dat = (PetscSF_Gatherv *)sf->data; 36 void *rootbuf = NULL, *leafbuf = NULL; /* buffer seen by MPI */ 37 MPI_Request *req; 38 39 PetscFunctionBegin; 40 PetscCall(PetscSFLinkCreate(sf, unit, rootmtype, rootdata, leafmtype, leafdata, op, PETSCSF_REDUCE, &link)); 41 PetscCall(PetscSFLinkPackLeafData(sf, link, PETSCSF_REMOTE, leafdata)); 42 PetscCall(PetscSFLinkCopyLeafBufferInCaseNotUseGpuAwareMPI(sf, link, PETSC_TRUE /* device2host before sending */)); 43 PetscCall(PetscObjectGetComm((PetscObject)sf, &comm)); 44 PetscCall(PetscMPIIntCast(sf->nroots, &recvcount)); 45 PetscCall(PetscSFLinkGetMPIBuffersAndRequests(sf, link, PETSCSF_LEAF2ROOT, &rootbuf, &leafbuf, &req, NULL)); 46 PetscCall(PetscSFLinkSyncStreamBeforeCallMPI(sf, link, PETSCSF_LEAF2ROOT)); 47 PetscCallMPI(MPIU_Iscatterv(leafbuf, dat->recvcounts, dat->displs, unit, rootbuf, recvcount, unit, 0, comm, req)); 48 PetscFunctionReturn(PETSC_SUCCESS); 49 } 50 51 PETSC_INTERN PetscErrorCode PetscSFFetchAndOpBegin_Gatherv(PetscSF sf, MPI_Datatype unit, PetscMemType rootmtype, void *rootdata, PetscMemType leafmtype, const void *leafdata, void *leafupdate, MPI_Op op) 52 { 53 PetscFunctionBegin; 54 /* In Gatherv, each root only has one leaf. So we just need to bcast rootdata to leafupdate and then reduce leafdata to rootdata */ 55 PetscCall(PetscSFBcastBegin(sf, unit, rootdata, leafupdate, MPI_REPLACE)); 56 PetscCall(PetscSFBcastEnd(sf, unit, rootdata, leafupdate, MPI_REPLACE)); 57 PetscCall(PetscSFReduceBegin(sf, unit, leafdata, rootdata, op)); 58 PetscFunctionReturn(PETSC_SUCCESS); 59 } 60 61 PETSC_INTERN PetscErrorCode PetscSFCreate_Gatherv(PetscSF sf) 62 { 63 PetscSF_Gatherv *dat = (PetscSF_Gatherv *)sf->data; 64 65 PetscFunctionBegin; 66 sf->ops->BcastEnd = PetscSFBcastEnd_Basic; 67 sf->ops->ReduceEnd = PetscSFReduceEnd_Basic; 68 69 /* Inherit from Allgatherv */ 70 sf->ops->SetUp = PetscSFSetUp_Allgatherv; 71 sf->ops->Reset = PetscSFReset_Allgatherv; 72 sf->ops->Destroy = PetscSFDestroy_Allgatherv; 73 sf->ops->GetGraph = PetscSFGetGraph_Allgatherv; 74 sf->ops->GetLeafRanks = PetscSFGetLeafRanks_Allgatherv; 75 sf->ops->GetRootRanks = PetscSFGetRootRanks_Allgatherv; 76 sf->ops->FetchAndOpEnd = PetscSFFetchAndOpEnd_Allgatherv; 77 sf->ops->CreateLocalSF = PetscSFCreateLocalSF_Allgatherv; 78 79 /* Gatherv stuff */ 80 sf->ops->BcastBegin = PetscSFBcastBegin_Gatherv; 81 sf->ops->ReduceBegin = PetscSFReduceBegin_Gatherv; 82 sf->ops->FetchAndOpBegin = PetscSFFetchAndOpBegin_Gatherv; 83 84 PetscCall(PetscNew(&dat)); 85 sf->data = (void *)dat; 86 PetscFunctionReturn(PETSC_SUCCESS); 87 } 88