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#include "mpi.h"
#include "fem.h"
void MaxwellsRHS3d(Mesh *mesh, float frka, float frkb, float fdt){
/* registers and temporary */
register unsigned int k, n;
/* mesh parameters */
const int K = mesh->K;
float *vgeo = mesh->vgeo;
float *surfinfo = mesh->surfinfo;
float *f_Dr = mesh->f_Dr;
float *f_Ds = mesh->f_Ds;
float *f_Dt = mesh->f_Dt;
float *f_LIFT = mesh->f_LIFT;
float *f_Q = mesh->f_Q;
float *f_rhsQ = mesh->f_rhsQ;
float *f_resQ = mesh->f_resQ;
float *f_inQ = mesh->f_inQ;
float *f_outQ = mesh->f_outQ;
int p;
/* mpi request buffer */
MPI_Request *mpi_out_requests = (MPI_Request*) calloc(mesh->nprocs, sizeof(MPI_Request));
MPI_Request *mpi_in_requests = (MPI_Request*) calloc(mesh->nprocs, sizeof(MPI_Request));
/* buffer outgoing node data */
for(n=0;n<mesh->parNtotalout;++n)
mesh->f_outQ[n] = f_Q[mesh->parmapOUT[n]];
/* do sends */
int sk = 0, Nmess = 0;
for(p=0;p<mesh->nprocs;++p){
if(p!=mesh->procid){
int Nout = mesh->Npar[p]*p_Nfields*p_Nfp;
if(Nout){
/* symmetric communications (different ordering) */
MPI_Isend(f_outQ+sk, Nout, MPI_FLOAT, p, 6666+p, MPI_COMM_WORLD, mpi_out_requests +Nmess);
MPI_Irecv(f_inQ+sk, Nout, MPI_FLOAT, p, 6666+mesh->procid, MPI_COMM_WORLD, mpi_in_requests +Nmess);
sk+=Nout;
++Nmess;
}
}
}
for(k=0;k<K;++k){
/* NOTE: once k is known, all other indexing variables etc are derived */
register unsigned int n, m;
/* NOTE: should be local memory */
float Qk[p_Np*p_Nfields];
/* NOTE: index into geometric factors */
int geoid=k*12;
const float drdx = vgeo[geoid++], drdy = vgeo[geoid++], drdz = vgeo[geoid++]; ++geoid;
const float dsdx = vgeo[geoid++], dsdy = vgeo[geoid++], dsdz = vgeo[geoid++]; ++geoid;
const float dtdx = vgeo[geoid++], dtdy = vgeo[geoid++], dtdz = vgeo[geoid++]; ++geoid;
int id = k*p_Nfp*p_Nfaces;
/* NOTE: buffer element k into local storage */
float *qpt = f_Q+p_Nfields*p_Np*k;
for(m=0;m<p_Nfields*p_Np;++m){
Qk[m] = qpt[m];
}
int sk = 0;
for(n=0;n<p_Np;++n){
const float *ptDr = f_Dr+n*p_Np;
const float *ptDs = f_Ds+n*p_Np;
const float *ptDt = f_Dt+n*p_Np;
int skV = 0;
float rhsHx = 0, rhsHy = 0, rhsHz = 0;
float rhsEx = 0, rhsEy = 0, rhsEz = 0;
int sk3 = 0;
for(m=0;m<p_Np;++m){
const float dr = ptDr[m], ds = ptDs[m], dt = ptDt[m];
const float dx = drdx*dr+dsdx*ds+dtdx*dt;
const float dy = drdy*dr+dsdy*ds+dtdy*dt;
const float dz = drdz*dr+dsdz*ds+dtdz*dt;
const float nHx = Qk[sk3++];
const float nHy = Qk[sk3++];
const float nHz = Qk[sk3++];
const float nEx = Qk[sk3++];
const float nEy = Qk[sk3++];
const float nEz = Qk[sk3++];
rhsHx += dz*nEy-dy*nEz;
rhsHy += dx*nEz-dz*nEx;
rhsHz += dy*nEx-dx*nEy;
rhsEx += dy*nHz-dz*nHy;
rhsEy += dz*nHx-dx*nHz;
rhsEz += dx*nHy-dy*nHx;
}
int skR = p_Nfields*(n+k*p_Np);
f_rhsQ[skR++] = rhsHx;
f_rhsQ[skR++] = rhsHy;
f_rhsQ[skR++] = rhsHz;
f_rhsQ[skR++] = rhsEx;
f_rhsQ[skR++] = rhsEy;
f_rhsQ[skR++] = rhsEz;
}
}
/* DO RECV */
MPI_Status *instatus = (MPI_Status*) calloc(mesh->nprocs, sizeof(MPI_Status));
MPI_Waitall(Nmess, mpi_in_requests, instatus);
free(instatus);
for(k=0;k<K;++k){
/* NOTE: once k is known, all other indexing variables etc are derived */
register unsigned int n, m;
/* NOTE: should be local memory */
float fluxQ[p_Nfaces*p_Nfp*p_Nfields];
/* NOTE: index into geometric factors */
int surfid=k*7*p_Nfp*p_Nfaces;
int id = k*p_Nfp*p_Nfaces;
int sk = 0;
for(m=0;m<p_Nfp*p_Nfaces;++m){
int idM = surfinfo[surfid++];
int idP = surfinfo[surfid++];
const float FSc = surfinfo[surfid++];
const float BSc = surfinfo[surfid++];
const float NXf = surfinfo[surfid++];
const float NYf = surfinfo[surfid++];
const float NZf = surfinfo[surfid++];
float dHx, dHy, dHz, dEx, dEy, dEz;
if(idP<0){
idP = p_Nfields*(-1-idP);
dHx = FSc*(f_inQ[idP++] -f_Q[idM++]);
dHy = FSc*(f_inQ[idP++] -f_Q[idM++]);
dHz = FSc*(f_inQ[idP++] -f_Q[idM++]);
dEx = FSc*(f_inQ[idP++] -f_Q[idM++]);
dEy = FSc*(f_inQ[idP++] -f_Q[idM++]);
dEz = FSc*(f_inQ[idP] -f_Q[idM]);
}else{
dHx = FSc*( f_Q[idP++] -f_Q[idM++]);
dHy = FSc*( f_Q[idP++] -f_Q[idM++]);
dHz = FSc*( f_Q[idP++] -f_Q[idM++]);
dEx = FSc*(BSc*f_Q[idP++] -f_Q[idM++]);
dEy = FSc*(BSc*f_Q[idP++] -f_Q[idM++]);
dEz = FSc*(BSc*f_Q[idP] -f_Q[idM]);
}
const float ndotdH = NXf*dHx + NYf*dHy + NZf*dHz;
const float ndotdE = NXf*dEx + NYf*dEy + NZf*dEz;
fluxQ[sk++] = -NYf*dEz + NZf*dEy + dHx - ndotdH*NXf;
fluxQ[sk++] = -NZf*dEx + NXf*dEz + dHy - ndotdH*NYf;
fluxQ[sk++] = -NXf*dEy + NYf*dEx + dHz - ndotdH*NZf;
fluxQ[sk++] = NYf*dHz - NZf*dHy + dEx - ndotdE*NXf;
fluxQ[sk++] = NZf*dHx - NXf*dHz + dEy - ndotdE*NYf;
fluxQ[sk++] = NXf*dHy - NYf*dHx + dEz - ndotdE*NZf;
}
for(n=0;n<p_Np;++n){
const float *ptLIFT = f_LIFT+n*p_Nfp*p_Nfaces;
float rhsHx = 0, rhsHy = 0, rhsHz = 0;
float rhsEx = 0, rhsEy = 0, rhsEz = 0;
int sk3 = 0;
/* NOTE: hint for compiler (nvcc) to unroll */
for(m=0;m<p_Nfp*p_Nfaces;++m){
const float L = ptLIFT[m];
rhsHx += L*fluxQ[sk3++];
rhsHy += L*fluxQ[sk3++];
rhsHz += L*fluxQ[sk3++];
rhsEx += L*fluxQ[sk3++];
rhsEy += L*fluxQ[sk3++];
rhsEz += L*fluxQ[sk3++];
}
int skR = p_Nfields*(n+k*p_Np);
f_rhsQ[skR++] += rhsHx;
f_rhsQ[skR++] += rhsHy;
f_rhsQ[skR++] += rhsHz;
f_rhsQ[skR++] += rhsEx;
f_rhsQ[skR++] += rhsEy;
f_rhsQ[skR++] += rhsEz;
}
}
for(n=0;n<K*p_Np*p_Nfields;++n){
f_resQ[n] = frka*f_resQ[n]+fdt*f_rhsQ[n];
f_Q[n] += frkb*f_resQ[n];
}
/* make sure all messages went out */
MPI_Status *outstatus = (MPI_Status*) calloc(mesh->nprocs, sizeof(MPI_Status));
MPI_Waitall(Nmess, mpi_out_requests, outstatus);
free(outstatus);
}
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