xref: /petsc/include/petscsf.h (revision af0996ce37bc06907c37d8d91773840993d61e62)
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