Actual source code: ex2.c
1: static char help[] = "Test DMCreateCoordinateDM_Network, and related functions \n\n";
3: #include <petscdmnetwork.h>
5: /*
6: CreateStarGraphEdgeList - Create a k-Star Graph Edgelist on current processor
7: Not Collective
9: Input Parameters:
10: . k - order of the star graph (number of edges)
11: . directin - if true direction of edges is towards the center vertex, otherwise they are directed out of the center vertex.
13: Output Parameters:
14: . ne - number of edges of this star graph
15: . edgelist - list of edges for this star graph, this is a one dimensional array with pairs of entries being the two vertices (in global numbering of the vertices) of each edge,
16: [first vertex of first edge, second vertex of first edge, first vertex of second edge, second vertex of second edge, etc].
18: User is responsible for deallocating this memory.
19: */
20: static PetscErrorCode StarGraphCreateEdgeList(PetscInt k, PetscBool directin, PetscInt *ne, PetscInt *edgelist[])
21: {
22: PetscFunctionBegin;
23: *ne = k;
24: PetscCall(PetscCalloc1(2 * k, edgelist));
26: if (directin) {
27: for (PetscInt i = 0; i < k; i++) {
28: (*edgelist)[2 * i] = i + 1;
29: (*edgelist)[2 * i + 1] = 0;
30: }
31: } else {
32: for (PetscInt i = 0; i < k; i++) {
33: (*edgelist)[2 * i] = 0;
34: (*edgelist)[2 * i + 1] = i + 1;
35: }
36: }
37: PetscFunctionReturn(PETSC_SUCCESS);
38: }
40: /* Simple Circular embedding of the star graph */
41: static PetscErrorCode StarGraphSetCoordinates(DM dm, PetscReal *vcolor)
42: {
43: DM cdm;
44: Vec Coord;
45: PetscScalar *coord;
46: PetscInt vStart, vEnd, v, vglobal, compkey = 0, off, NVert;
47: PetscReal theta;
49: PetscFunctionBegin;
50: PetscCall(DMSetCoordinateDim(dm, 2));
51: PetscCall(DMGetCoordinateDM(dm, &cdm));
53: PetscCall(DMNetworkGetVertexRange(cdm, &vStart, &vEnd));
54: PetscCall(DMNetworkRegisterComponent(cdm, "coordinate", sizeof(PetscReal), &compkey));
55: for (v = vStart; v < vEnd; v++) {
56: PetscCall(DMNetworkGetGlobalVertexIndex(cdm, v, &vglobal));
57: vcolor[v - vStart] = vglobal;
58: PetscCall(DMNetworkAddComponent(cdm, v, compkey, &vcolor[v - vStart], 2));
59: }
60: PetscCall(DMNetworkFinalizeComponents(cdm));
62: PetscCall(DMCreateLocalVector(cdm, &Coord));
63: PetscCall(VecGetArray(Coord, &coord));
64: PetscCall(DMNetworkGetNumVertices(cdm, NULL, &NVert));
65: theta = 2 * PETSC_PI / (NVert - 1);
66: for (v = vStart; v < vEnd; v++) {
67: PetscCall(DMNetworkGetGlobalVertexIndex(cdm, v, &vglobal));
68: PetscCall(DMNetworkGetLocalVecOffset(cdm, v, 0, &off));
69: if (vglobal == 0) {
70: coord[off] = 0.0;
71: coord[off + 1] = 0.0;
72: } else {
73: /* embed on the unit circle */
74: coord[off] = PetscCosReal(theta * (vglobal - 1));
75: coord[off + 1] = PetscSinReal(theta * (vglobal - 1));
76: }
77: }
78: PetscCall(VecRestoreArray(Coord, &coord));
79: PetscCall(DMSetCoordinatesLocal(dm, Coord));
80: PetscCall(VecDestroy(&Coord));
81: PetscFunctionReturn(PETSC_SUCCESS);
82: }
84: /*
85: CreateSimpleStarGraph - Create a Distributed k-Star Graph DMNetwork with a single PetscInt component on
86: all edges and vertices, a selectable number of dofs on vertices and edges. Intended mostly to be used for testing purposes.
88: Input Parameters:
89: . comm - the communicator of the dm
90: . numdofvert - number of degrees of freedom (dofs) on vertices
91: . numdofedge - number of degrees of freedom (dofs) on edges
92: . k - order of the star graph (number of edges)
93: . directin - if true direction of edges is towards the center vertex, otherwise they are directed out of the center vertex
95: Output Parameters:
96: . newdm - The created and distributed simple Star Graph
97: */
98: static PetscErrorCode StarGraphCreate(MPI_Comm comm, PetscInt numdofvert, PetscInt numdofedge, PetscInt k, PetscBool directin, DM *newdm)
99: {
100: DM dm;
101: PetscMPIInt rank;
102: PetscInt ne = 0, compkey, eStart, eEnd, vStart, vEnd, e, v;
103: PetscInt *edgelist = NULL, *compedge, *compvert;
104: PetscReal *vcolor;
106: PetscFunctionBegin;
107: PetscCall(DMNetworkCreate(comm, &dm));
108: PetscCall(DMNetworkSetNumSubNetworks(dm, PETSC_DECIDE, 1));
109: PetscCallMPI(MPI_Comm_rank(comm, &rank));
110: if (rank == 0) PetscCall(StarGraphCreateEdgeList(k, directin, &ne, &edgelist));
111: PetscCall(DMNetworkAddSubnetwork(dm, "Main", ne, edgelist, NULL));
112: PetscCall(DMNetworkRegisterComponent(dm, "unused", sizeof(PetscInt), &compkey));
113: PetscCall(DMNetworkLayoutSetUp(dm));
114: PetscCall(PetscFree(edgelist));
115: PetscCall(DMNetworkGetEdgeRange(dm, &eStart, &eEnd));
116: PetscCall(DMNetworkGetVertexRange(dm, &vStart, &vEnd));
117: PetscCall(PetscCalloc3(eEnd - eStart, &compedge, vEnd - vStart, &compvert, vEnd - vStart, &vcolor));
118: for (e = eStart; e < eEnd; e++) {
119: compedge[e - eStart] = e;
120: PetscCall(DMNetworkAddComponent(dm, e, compkey, &compedge[e - eStart], numdofedge));
121: }
122: for (v = vStart; v < vEnd; v++) {
123: compvert[v - vStart] = v;
124: PetscCall(DMNetworkAddComponent(dm, v, compkey, &compvert[v - vStart], numdofvert));
125: }
127: PetscCall(StarGraphSetCoordinates(dm, vcolor));
129: PetscCall(DMSetFromOptions(dm));
130: PetscCall(DMSetUp(dm));
131: PetscCall(PetscFree3(compedge, compvert, vcolor));
133: *newdm = dm;
134: PetscFunctionReturn(PETSC_SUCCESS);
135: }
137: /* This subroutine is used in petsc/src/snes/tutorials/network/ex1.c */
138: static PetscErrorCode CoordinatePrint(DM dm)
139: {
140: DM dmclone;
141: PetscInt cdim, v, off, vglobal, vStart, vEnd;
142: const PetscScalar *carray;
143: Vec coords;
144: MPI_Comm comm;
145: PetscMPIInt rank;
147: PetscFunctionBegin;
148: PetscCall(PetscObjectGetComm((PetscObject)dm, &comm));
149: PetscCallMPI(MPI_Comm_rank(comm, &rank));
151: PetscCall(DMGetCoordinateDM(dm, &dmclone));
152: PetscCall(DMNetworkGetVertexRange(dm, &vStart, &vEnd));
153: PetscCall(DMGetCoordinatesLocal(dm, &coords));
155: PetscCall(DMGetCoordinateDim(dm, &cdim));
156: PetscCall(VecGetArrayRead(coords, &carray));
158: PetscCall(PetscPrintf(MPI_COMM_WORLD, "\nCoordinatePrint, cdim %" PetscInt_FMT ":\n", cdim));
159: PetscCall(PetscSynchronizedPrintf(MPI_COMM_WORLD, "[%d]\n", rank));
160: for (v = vStart; v < vEnd; v++) {
161: PetscCall(DMNetworkGetLocalVecOffset(dmclone, v, 0, &off));
162: PetscCall(DMNetworkGetGlobalVertexIndex(dmclone, v, &vglobal));
163: switch (cdim) {
164: case 2:
165: PetscCall(PetscSynchronizedPrintf(MPI_COMM_WORLD, "Vertex: %" PetscInt_FMT ", x = %f y = %f \n", vglobal, (double)PetscRealPart(carray[off]), (double)PetscRealPart(carray[off + 1])));
166: break;
167: default:
168: PetscCheck(cdim == 2, MPI_COMM_WORLD, PETSC_ERR_SUP, "Only supports Network embedding dimension of 2, not supplied %" PetscInt_FMT, cdim);
169: break;
170: }
171: }
172: PetscCall(PetscSynchronizedFlush(MPI_COMM_WORLD, NULL));
173: PetscCall(VecRestoreArrayRead(coords, &carray));
174: PetscFunctionReturn(PETSC_SUCCESS);
175: }
177: int main(int argc, char **argv)
178: {
179: DM dm;
180: PetscInt dofv = 1, dofe = 1, ne = 1;
181: PetscMPIInt rank;
182: PetscBool viewCSV = PETSC_FALSE;
184: PetscFunctionBeginUser;
185: PetscCall(PetscInitialize(&argc, &argv, NULL, help));
186: PetscCallMPI(MPI_Comm_rank(MPI_COMM_WORLD, &rank));
188: /* create a distributed k-Star graph DMNetwork */
189: PetscCall(PetscOptionsGetInt(NULL, NULL, "-dofv", &dofv, NULL));
190: PetscCall(PetscOptionsGetInt(NULL, NULL, "-dofe", &dofe, NULL));
191: PetscCall(PetscOptionsGetInt(NULL, NULL, "-ne", &ne, NULL));
192: PetscCall(PetscOptionsGetBool(NULL, NULL, "-viewCSV", &viewCSV, NULL));
194: /* create and setup a quick R^2 embedding of the star graph */
195: PetscCall(StarGraphCreate(PETSC_COMM_WORLD, dofv, dofe, ne, PETSC_TRUE, &dm));
197: PetscCall(DMNetworkDistribute(&dm, 0));
198: if (viewCSV) { /* CSV View of network with coordinates */
199: PetscCall(PetscViewerPushFormat(PETSC_VIEWER_STDOUT_WORLD, PETSC_VIEWER_ASCII_CSV));
200: PetscCall(DMView(dm, PETSC_VIEWER_STDOUT_WORLD));
201: PetscCall(PetscViewerPopFormat(PETSC_VIEWER_STDOUT_WORLD));
202: } else {
203: PetscCall(DMView(dm, PETSC_VIEWER_STDOUT_WORLD));
204: }
206: /* print or view the coordinates of each vertex */
207: PetscCall(CoordinatePrint(dm));
209: PetscCall(DMDestroy(&dm));
210: PetscCall(PetscFinalize());
211: }
213: /*TEST
215: test:
216: suffix: 0
217: args: -ne 4
219: test:
220: suffix: 1
221: nsize: 2
222: args: -ne 4 -petscpartitioner_type simple
224: TEST*/