Actual source code: pvec2.c

  1: #define PETSCVEC_DLL
  2: /*
  3:      Code for some of the parallel vector primatives.
  4: */
 5:  #include ../src/vec/vec/impls/mpi/pvecimpl.h
 6:  #include ../src/inline/dot.h
 7:  #include petscblaslapack.h

 11: PetscErrorCode VecMDot_MPI(Vec xin,PetscInt nv,const Vec y[],PetscScalar *z)
 12: {
 13:   PetscScalar awork[128],*work = awork;

 17:   if (nv > 128) {
 18:     PetscMalloc(nv*sizeof(PetscScalar),&work);
 19:   }
 20:   VecMDot_Seq(xin,nv,y,work);
 21:   MPI_Allreduce(work,z,nv,MPIU_SCALAR,PetscSum_Op,((PetscObject)xin)->comm);
 22:   if (nv > 128) {
 23:     PetscFree(work);
 24:   }
 25:   return(0);
 26: }

 30: PetscErrorCode VecMTDot_MPI(Vec xin,PetscInt nv,const Vec y[],PetscScalar *z)
 31: {
 32:   PetscScalar awork[128],*work = awork;

 36:   if (nv > 128) {
 37:     PetscMalloc(nv*sizeof(PetscScalar),&work);
 38:   }
 39:   VecMTDot_Seq(xin,nv,y,work);
 40:   MPI_Allreduce(work,z,nv,MPIU_SCALAR,PetscSum_Op,((PetscObject)xin)->comm);
 41:   if (nv > 128) {
 42:     PetscFree(work);
 43:   }
 44:   return(0);
 45: }

 49: PetscErrorCode VecNorm_MPI(Vec xin,NormType type,PetscReal *z)
 50: {
 51:   Vec_MPI        *x = (Vec_MPI*)xin->data;
 52:   PetscReal      sum,work = 0.0;
 53:   PetscScalar    *xx = x->array;
 55:   PetscInt       n = xin->map->n;

 58:   if (type == NORM_2 || type == NORM_FROBENIUS) {

 60: #if defined(PETSC_HAVE_SLOW_BLAS_NORM2)
 61: #if defined(PETSC_USE_FORTRAN_KERNEL_NORM)
 62:     fortrannormsqr_(xx,&n,&work);
 63: #elif defined(PETSC_USE_UNROLLED_NORM)
 64:     switch (n & 0x3) {
 65:       case 3: work += PetscRealPart(xx[0]*PetscConj(xx[0])); xx++;
 66:       case 2: work += PetscRealPart(xx[0]*PetscConj(xx[0])); xx++;
 67:       case 1: work += PetscRealPart(xx[0]*PetscConj(xx[0])); xx++; n -= 4;
 68:     }
 69:     while (n>0) {
 70:       work += PetscRealPart(xx[0]*PetscConj(xx[0])+xx[1]*PetscConj(xx[1])+
 71:                         xx[2]*PetscConj(xx[2])+xx[3]*PetscConj(xx[3]));
 72:       xx += 4; n -= 4;
 73:     }
 74: #else
 75:     {PetscInt i; for (i=0; i<n; i++) work += PetscRealPart((xx[i])*(PetscConj(xx[i])));}
 76: #endif
 77: #else
 78:     {PetscBLASInt one = 1,bn = PetscBLASIntCast(n);
 79:       work  = BLASnrm2_(&bn,xx,&one);
 80:       work *= work;
 81:     }
 82: #endif
 83:     MPI_Allreduce(&work,&sum,1,MPIU_REAL,MPI_SUM,((PetscObject)xin)->comm);
 84:     *z = sqrt(sum);
 85:     PetscLogFlops(2*xin->map->n);
 86:   } else if (type == NORM_1) {
 87:     /* Find the local part */
 88:     VecNorm_Seq(xin,NORM_1,&work);
 89:     /* Find the global max */
 90:     MPI_Allreduce(&work,z,1,MPIU_REAL,MPI_SUM,((PetscObject)xin)->comm);
 91:   } else if (type == NORM_INFINITY) {
 92:     /* Find the local max */
 93:     VecNorm_Seq(xin,NORM_INFINITY,&work);
 94:     /* Find the global max */
 95:     MPI_Allreduce(&work,z,1,MPIU_REAL,MPI_MAX,((PetscObject)xin)->comm);
 96:   } else if (type == NORM_1_AND_2) {
 97:     PetscReal temp[2];
 98:     VecNorm_Seq(xin,NORM_1,temp);
 99:     VecNorm_Seq(xin,NORM_2,temp+1);
100:     temp[1] = temp[1]*temp[1];
101:     MPI_Allreduce(temp,z,2,MPIU_REAL,MPI_SUM,((PetscObject)xin)->comm);
102:     z[1] = sqrt(z[1]);
103:   }
104:   return(0);
105: }

107: /*
108:        These two functions are the MPI reduction operation used for max and min with index
109:    The call below to MPI_Op_create() converts the function Vec[Max,Min]_Local() to the 
110:    MPI operator Vec[Max,Min]_Local_Op.
111: */
112: MPI_Op VecMax_Local_Op = 0;
113: MPI_Op VecMin_Local_Op = 0;

118: void  MPIAPI VecMax_Local(void *in,void *out,PetscMPIInt *cnt,MPI_Datatype *datatype)
119: {
120:   PetscReal *xin = (PetscReal *)in,*xout = (PetscReal*)out;

123:   if (*datatype != MPIU_REAL) {
124:     (*PetscErrorPrintf)("Can only handle MPIU_REAL data types");
125:     MPI_Abort(MPI_COMM_WORLD,1);
126:   }
127:   if (xin[0] > xout[0]) {
128:     xout[0] = xin[0];
129:     xout[1] = xin[1];
130:   }
131:   PetscFunctionReturnVoid(); /* cannot return a value */
132: }

138: void  MPIAPI VecMin_Local(void *in,void *out,PetscMPIInt *cnt,MPI_Datatype *datatype)
139: {
140:   PetscReal *xin = (PetscReal *)in,*xout = (PetscReal*)out;

143:   if (*datatype != MPIU_REAL) {
144:     (*PetscErrorPrintf)("Can only handle MPIU_REAL data types");
145:     MPI_Abort(MPI_COMM_WORLD,1);
146:   }
147:   if (xin[0] < xout[0]) {
148:     xout[0] = xin[0];
149:     xout[1] = xin[1];
150:   }
151:   PetscFunctionReturnVoid();
152: }

157: PetscErrorCode VecMax_MPI(Vec xin,PetscInt *idx,PetscReal *z)
158: {
160:   PetscReal      work;

163:   /* Find the local max */
164:   VecMax_Seq(xin,idx,&work);

166:   /* Find the global max */
167:   if (!idx) {
168:     MPI_Allreduce(&work,z,1,MPIU_REAL,MPI_MAX,((PetscObject)xin)->comm);
169:   } else {
170:     PetscReal work2[2],z2[2];
171:     PetscInt  rstart;
172:     rstart = xin->map->rstart;
173:     work2[0] = work;
174:     work2[1] = *idx + rstart;
175:     MPI_Allreduce(work2,z2,2,MPIU_REAL,VecMax_Local_Op,((PetscObject)xin)->comm);
176:     *z   = z2[0];
177:     *idx = (PetscInt)z2[1];
178:   }
179:   return(0);
180: }

184: PetscErrorCode VecMin_MPI(Vec xin,PetscInt *idx,PetscReal *z)
185: {
187:   PetscReal work;

190:   /* Find the local Min */
191:   VecMin_Seq(xin,idx,&work);

193:   /* Find the global Min */
194:   if (!idx) {
195:     MPI_Allreduce(&work,z,1,MPIU_REAL,MPI_MIN,((PetscObject)xin)->comm);
196:   } else {
197:     PetscReal work2[2],z2[2];
198:     PetscInt       rstart;

200:     VecGetOwnershipRange(xin,&rstart,PETSC_NULL);
201:     work2[0] = work;
202:     work2[1] = *idx + rstart;
203:     MPI_Allreduce(work2,z2,2,MPIU_REAL,VecMin_Local_Op,((PetscObject)xin)->comm);
204:     *z   = z2[0];
205:     *idx = (PetscInt)z2[1];
206:   }
207:   return(0);
208: }