1 /* 2 A star forest (SF) describes a communication pattern 3 */ 4 #if !defined(__PETSCSF_H) 5 #define __PETSCSF_H 6 #include <petscsys.h> 7 #include <petscsftypes.h> 8 9 PETSC_EXTERN PetscClassId PETSCSF_CLASSID; 10 11 /*J 12 PetscSFType - String with the name of a PetscSF method or the creation function 13 with an optional dynamic library name, for example 14 http://www.mcs.anl.gov/petsc/lib.so:mysfcreate() 15 16 Level: beginner 17 18 Notes: The two approaches provided are 19 $ PETSCSFBASIC which uses MPI 1 message passing to perform the communication and 20 $ PETSCSFWINDOW which uses MPI 2 one-sided operations to perform the communication, this may be more efficient, 21 $ but may not be available for all MPI distributions. In particular OpenMPI has bugs in its one-sided 22 $ operations that prevent its use. 23 24 .seealso: PetscSFSetType(), PetscSF 25 J*/ 26 typedef const char *PetscSFType; 27 #define PETSCSFBASIC "basic" 28 #define PETSCSFWINDOW "window" 29 30 /*E 31 PetscSFWindowSyncType - Type of synchronization for PETSCSFWINDOW 32 33 $ PETSCSF_WINDOW_SYNC_FENCE - simplest model, synchronizing across communicator 34 $ PETSCSF_WINDOW_SYNC_LOCK - passive model, less synchronous, requires less setup than PETSCSF_WINDOW_SYNC_ACTIVE, but may require more handshakes 35 $ PETSCSF_WINDOW_SYNC_ACTIVE - active model, provides most information to MPI implementation, needs to construct 2-way process groups (more setup than PETSCSF_WINDOW_SYNC_LOCK) 36 37 Level: advanced 38 39 .seealso: PetscSFWindowSetSyncType(), PetscSFWindowGetSyncType() 40 E*/ 41 typedef enum {PETSCSF_WINDOW_SYNC_FENCE,PETSCSF_WINDOW_SYNC_LOCK,PETSCSF_WINDOW_SYNC_ACTIVE} PetscSFWindowSyncType; 42 PETSC_EXTERN const char *const PetscSFWindowSyncTypes[]; 43 44 /*E 45 PetscSFDuplicateOption - Aspects to preserve when duplicating a PetscSF 46 47 $ PETSCSF_DUPLICATE_CONFONLY - configuration only, user must call PetscSFSetGraph() 48 $ PETSCSF_DUPLICATE_RANKS - communication ranks preserved, but different graph (allows simpler setup after calling PetscSFSetGraph()) 49 $ PETSCSF_DUPLICATE_GRAPH - entire graph duplicated 50 51 Level: beginner 52 53 .seealso: PetscSFDuplicate() 54 E*/ 55 typedef enum {PETSCSF_DUPLICATE_CONFONLY,PETSCSF_DUPLICATE_RANKS,PETSCSF_DUPLICATE_GRAPH} PetscSFDuplicateOption; 56 PETSC_EXTERN const char *const PetscSFDuplicateOptions[]; 57 58 PETSC_EXTERN PetscFunctionList PetscSFList; 59 PETSC_EXTERN PetscErrorCode PetscSFRegister(const char[],PetscErrorCode (*)(PetscSF)); 60 61 PETSC_EXTERN PetscErrorCode PetscSFInitializePackage(void); 62 PETSC_EXTERN PetscErrorCode PetscSFFinalizePackage(void); 63 PETSC_EXTERN PetscErrorCode PetscSFCreate(MPI_Comm comm,PetscSF*); 64 PETSC_EXTERN PetscErrorCode PetscSFDestroy(PetscSF*); 65 PETSC_EXTERN PetscErrorCode PetscSFSetType(PetscSF,PetscSFType); 66 PETSC_EXTERN PetscErrorCode PetscSFView(PetscSF,PetscViewer); 67 PETSC_EXTERN PetscErrorCode PetscSFSetUp(PetscSF); 68 PETSC_EXTERN PetscErrorCode PetscSFSetFromOptions(PetscSF); 69 PETSC_EXTERN PetscErrorCode PetscSFDuplicate(PetscSF,PetscSFDuplicateOption,PetscSF*); 70 PETSC_EXTERN PetscErrorCode PetscSFWindowSetSyncType(PetscSF,PetscSFWindowSyncType); 71 PETSC_EXTERN PetscErrorCode PetscSFWindowGetSyncType(PetscSF,PetscSFWindowSyncType*); 72 PETSC_EXTERN PetscErrorCode PetscSFSetRankOrder(PetscSF,PetscBool); 73 PETSC_EXTERN PetscErrorCode PetscSFSetGraph(PetscSF,PetscInt,PetscInt,const PetscInt*,PetscCopyMode,const PetscSFNode*,PetscCopyMode); 74 PETSC_EXTERN PetscErrorCode PetscSFGetGraph(PetscSF,PetscInt *nroots,PetscInt *nleaves,const PetscInt **ilocal,const PetscSFNode **iremote); 75 PETSC_EXTERN PetscErrorCode PetscSFGetLeafRange(PetscSF,PetscInt*,PetscInt*); 76 PETSC_EXTERN PetscErrorCode PetscSFCreateEmbeddedSF(PetscSF,PetscInt nroots,const PetscInt *selected,PetscSF *newsf); 77 PETSC_EXTERN PetscErrorCode PetscSFReset(PetscSF); 78 PETSC_EXTERN PetscErrorCode PetscSFGetRanks(PetscSF,PetscInt*,const PetscMPIInt**,const PetscInt**,const PetscInt**,const PetscInt**); 79 PETSC_EXTERN PetscErrorCode PetscSFGetGroups(PetscSF,MPI_Group*,MPI_Group*); 80 PETSC_EXTERN PetscErrorCode PetscSFGetMultiSF(PetscSF,PetscSF*); 81 PETSC_EXTERN PetscErrorCode PetscSFCreateInverseSF(PetscSF,PetscSF*); 82 83 /* broadcasts rootdata to leafdata */ 84 PETSC_EXTERN PetscErrorCode PetscSFBcastBegin(PetscSF,MPI_Datatype,const void *rootdata,void *leafdata) 85 PetscAttrMPIPointerWithType(3,2) PetscAttrMPIPointerWithType(4,2); 86 PETSC_EXTERN PetscErrorCode PetscSFBcastEnd(PetscSF,MPI_Datatype,const void *rootdata,void *leafdata) 87 PetscAttrMPIPointerWithType(3,2) PetscAttrMPIPointerWithType(4,2); 88 /* Reduce leafdata into rootdata using provided operation */ 89 PETSC_EXTERN PetscErrorCode PetscSFReduceBegin(PetscSF,MPI_Datatype,const void *leafdata,void *rootdata,MPI_Op) 90 PetscAttrMPIPointerWithType(3,2) PetscAttrMPIPointerWithType(4,2); 91 PETSC_EXTERN PetscErrorCode PetscSFReduceEnd(PetscSF,MPI_Datatype,const void *leafdata,void *rootdata,MPI_Op) 92 PetscAttrMPIPointerWithType(3,2) PetscAttrMPIPointerWithType(4,2); 93 /* Atomically modifies (using provided operation) rootdata using leafdata from each leaf, value at root at time of modification is returned in leafupdate. */ 94 PETSC_EXTERN PetscErrorCode PetscSFFetchAndOpBegin(PetscSF,MPI_Datatype,void *rootdata,const void *leafdata,void *leafupdate,MPI_Op) 95 PetscAttrMPIPointerWithType(3,2) PetscAttrMPIPointerWithType(4,2) PetscAttrMPIPointerWithType(5,2); 96 PETSC_EXTERN PetscErrorCode PetscSFFetchAndOpEnd(PetscSF,MPI_Datatype,void *rootdata,const void *leafdata,void *leafupdate,MPI_Op) 97 PetscAttrMPIPointerWithType(3,2) PetscAttrMPIPointerWithType(4,2) PetscAttrMPIPointerWithType(5,2); 98 /* Compute the degree of every root vertex (number of leaves in its star) */ 99 PETSC_EXTERN PetscErrorCode PetscSFComputeDegreeBegin(PetscSF,const PetscInt **degree); 100 PETSC_EXTERN PetscErrorCode PetscSFComputeDegreeEnd(PetscSF,const PetscInt **degree); 101 /* Concatenate data from all leaves into roots */ 102 PETSC_EXTERN PetscErrorCode PetscSFGatherBegin(PetscSF,MPI_Datatype,const void *leafdata,void *multirootdata) 103 PetscAttrMPIPointerWithType(3,2) PetscAttrMPIPointerWithType(4,2); 104 PETSC_EXTERN PetscErrorCode PetscSFGatherEnd(PetscSF,MPI_Datatype,const void *leafdata,void *multirootdata) 105 PetscAttrMPIPointerWithType(3,2) PetscAttrMPIPointerWithType(4,2); 106 /* Distribute distinct values to each leaf from roots */ 107 PETSC_EXTERN PetscErrorCode PetscSFScatterBegin(PetscSF,MPI_Datatype,const void *multirootdata,void *leafdata) 108 PetscAttrMPIPointerWithType(3,2) PetscAttrMPIPointerWithType(4,2); 109 PETSC_EXTERN PetscErrorCode PetscSFScatterEnd(PetscSF,MPI_Datatype,const void *multirootdata,void *leafdata) 110 PetscAttrMPIPointerWithType(3,2) PetscAttrMPIPointerWithType(4,2); 111 112 #if defined(MPI_REPLACE) 113 # define MPIU_REPLACE MPI_REPLACE 114 #else 115 /* When using an old MPI such that MPI_REPLACE is not defined, we do not pass MPI_REPLACE to MPI at all. Instead, we 116 * use it as a flag for our own reducer in the PETSCSFBASIC implementation. This could be any unique value unlikely to 117 * collide with another MPI_Op so we'll just use the value that has been used by every version of MPICH since 118 * MPICH2-1.0.6. */ 119 # define MPIU_REPLACE (MPI_Op)(0x5800000d) 120 #endif 121 122 #endif 123