Actual source code: test18.c
slepc-3.21.2 2024-09-25
1: /*
2: - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
3: SLEPc - Scalable Library for Eigenvalue Problem Computations
4: Copyright (c) 2002-, Universitat Politecnica de Valencia, Spain
6: This file is part of SLEPc.
7: SLEPc is distributed under a 2-clause BSD license (see LICENSE).
8: - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
9: */
11: static char help[] = "Test DSSynchronize() on a NHEP.\n\n";
13: #include <slepcds.h>
15: PetscErrorCode CheckArray(PetscScalar *A,const char *label,PetscInt k)
16: {
17: PetscInt j;
18: PetscMPIInt p,size,rank;
19: PetscScalar dif,*buf;
20: PetscReal error;
22: PetscFunctionBeginUser;
23: PetscCallMPI(MPI_Comm_size(PETSC_COMM_WORLD,&size));
24: PetscCallMPI(MPI_Comm_rank(PETSC_COMM_WORLD,&rank));
25: if (rank) PetscCallMPI(MPI_Send(A,k,MPIU_SCALAR,0,111,PETSC_COMM_WORLD));
26: else {
27: PetscCall(PetscMalloc1(k,&buf));
28: for (p=1;p<size;p++) {
29: PetscCallMPI(MPI_Recv(buf,k,MPIU_SCALAR,p,111,PETSC_COMM_WORLD,MPI_STATUS_IGNORE));
30: dif = 0.0;
31: for (j=0;j<k;j++) dif += A[j]-buf[j];
32: error = PetscAbsScalar(dif);
33: if (error>10*PETSC_MACHINE_EPSILON) PetscCall(PetscPrintf(PETSC_COMM_WORLD," Array %s differs in proc %d: %g\n",label,(int)p,(double)error));
34: }
35: PetscCall(PetscFree(buf));
36: }
37: PetscFunctionReturn(PETSC_SUCCESS);
38: }
40: int main(int argc,char **argv)
41: {
42: DS ds;
43: SlepcSC sc;
44: PetscScalar *A,*Q,*wr,*wi;
45: PetscReal re,im;
46: PetscInt i,j,n=10;
47: PetscMPIInt size;
49: PetscFunctionBeginUser;
50: PetscCall(SlepcInitialize(&argc,&argv,(char*)0,help));
51: PetscCall(PetscOptionsGetInt(NULL,NULL,"-n",&n,NULL));
52: PetscCall(PetscPrintf(PETSC_COMM_WORLD,"Solve a Dense System of type NHEP - dimension %" PetscInt_FMT ".\n",n));
54: /* Create DS object */
55: PetscCall(DSCreate(PETSC_COMM_WORLD,&ds));
56: PetscCall(DSSetType(ds,DSNHEP));
57: PetscCall(DSSetFromOptions(ds));
58: PetscCall(DSAllocate(ds,n));
59: PetscCall(DSSetDimensions(ds,n,0,0));
61: /* Fill with Grcar matrix */
62: PetscCall(DSGetArray(ds,DS_MAT_A,&A));
63: for (i=1;i<n;i++) A[i+(i-1)*n]=-1.0;
64: for (j=0;j<4;j++) {
65: for (i=0;i<n-j;i++) A[i+(i+j)*n]=1.0;
66: }
67: PetscCall(DSRestoreArray(ds,DS_MAT_A,&A));
68: PetscCall(DSSetState(ds,DS_STATE_INTERMEDIATE));
70: /* Solve */
71: PetscCall(PetscMalloc2(n,&wr,n,&wi));
72: PetscCall(DSGetSlepcSC(ds,&sc));
73: sc->comparison = SlepcCompareLargestMagnitude;
74: sc->comparisonctx = NULL;
75: sc->map = NULL;
76: sc->mapobj = NULL;
77: PetscCall(DSSolve(ds,wr,wi));
78: PetscCall(DSSort(ds,wr,wi,NULL,NULL,NULL));
80: /* Print eigenvalues */
81: PetscCall(PetscPrintf(PETSC_COMM_WORLD,"Computed eigenvalues =\n"));
82: for (i=0;i<n;i++) {
83: #if defined(PETSC_USE_COMPLEX)
84: re = PetscRealPart(wr[i]);
85: im = PetscImaginaryPart(wr[i]);
86: #else
87: re = wr[i];
88: im = wi[i];
89: #endif
90: if (PetscAbs(im)<1e-10) PetscCall(PetscPrintf(PETSC_COMM_WORLD," %.5f\n",(double)re));
91: else PetscCall(PetscPrintf(PETSC_COMM_WORLD," %.5f%+.5fi\n",(double)re,(double)im));
92: }
94: /* Synchronize data and check */
95: PetscCall(DSSynchronize(ds,wr,wi));
96: PetscCallMPI(MPI_Comm_size(PETSC_COMM_WORLD,&size));
97: if (size>1) {
98: PetscCall(CheckArray(wr,"wr",n));
99: #if !defined(PETSC_USE_COMPLEX)
100: PetscCall(CheckArray(wi,"wi",n));
101: #endif
102: PetscCall(DSGetArray(ds,DS_MAT_A,&A));
103: PetscCall(CheckArray(A,"A",n*n));
104: PetscCall(DSRestoreArray(ds,DS_MAT_A,&A));
105: PetscCall(DSGetArray(ds,DS_MAT_Q,&Q));
106: PetscCall(CheckArray(Q,"Q",n*n));
107: PetscCall(DSRestoreArray(ds,DS_MAT_Q,&Q));
108: }
110: PetscCall(PetscFree2(wr,wi));
111: PetscCall(DSDestroy(&ds));
112: PetscCall(SlepcFinalize());
113: return 0;
114: }
116: /*TEST
118: testset:
119: nsize: {{1 2 3}}
120: filter: sed -e "s/[+-]\([0-9]\.[0-9]*i\)/+-\\1/" | sed -e "s/1.58254/1.58255/" | sed -e "s/1.75989/1.75988/" | sed -e "s/1.01945/1.01946/"
121: output_file: output/test18_1.out
122: test:
123: suffix: 1
124: args: -ds_parallel redundant
125: test:
126: suffix: 2
127: args: -ds_parallel synchronized
129: TEST*/