static inline void ilrinit (i_local_t l, bvt vec, void *v) {
i_cnt_t pos = (i_cnt_t)v;
lrinit(l, pos, INT);
}
static inline void flrinit (i_local_t l, bvt vec, void *v) {
i_cnt_t pos = (i_cnt_t)v;
lrinit(fp_mk(l), pos, FP);
}
int main(int argc, char *argv[])
{
bool cmplx, abc, taper;
int ix, iz, it, itau, n2, m2;
int nx, nz, ntau, nt, pad1, nb, nx2, nz2, nzx2, fnx, fnz, fnzx, nk;
float dt, dtau, par, dz, dx, thresh;
float tau0, tau;
float **lt, **rt;
float *curr, *prev;
float ***dd, ***mm, **v0;
sf_axis ax, az, atau;
sf_file tgather, cgather, left, right;
int cpuid, numprocs, nth;
float *sendbuf, *recvbuf;
MPI_Comm comm=MPI_COMM_WORLD;
sf_init(argc, argv);
MPI_Init(&argc, &argv);
MPI_Comm_rank(comm, &cpuid);
MPI_Comm_size(comm, &numprocs);
#ifdef _OPENMP
#pragma omp parallel
{
nth=omp_get_num_threads();
}
sf_warning(">>> Using %d threads <<<", nth);
#endif
tgather=sf_input("--input");
cgather=sf_output("--output");
left=sf_input("left");
right=sf_input("right");
az=sf_iaxa(tgather, 1);
ax=sf_iaxa(tgather, 2);
atau=sf_iaxa(tgather, 3);
nz=sf_n(az); dz = sf_d(az);
nx=sf_n(ax); dx = sf_d(ax);
ntau=sf_n(atau); dtau=sf_d(atau); tau0=sf_o(atau);
if(cpuid==0){
sf_oaxa(cgather, az, 1);
sf_oaxa(cgather, ax, 2);
sf_oaxa(cgather, atau, 3);
}
if(!sf_getfloat("dt", &dt)) dt=0.001; /* time interval */
if(!sf_getint("nb", &nb)) nb=60; /* boundary width */
if(!sf_getfloat("par", &par)) par=0.01; /* absorbing boundary coefficient */
if(!sf_getbool("cmplx", &cmplx)) cmplx=false; /* use complex FFT */
if(!sf_getbool("abc", &abc)) abc=true; /* absorbing boundary condition */
if(!sf_getint("pad1", &pad1)) pad1=1; /* padding factor on the first axis */
if(!sf_getbool("taper", &taper)) taper=true; /* tapering */
if(!sf_getfloat("thresh", &thresh)) thresh=0.92; /* thresholding */
nx2=nx+2*nb;
nz2=nz+2*nb;
nk=fft2_init(cmplx,pad1,nz2,nx2,&fnz,&fnx);
nzx2=nz2*nx2;
fnzx=fnz*fnx;
if (!sf_histint(left,"n1",&n2) || n2 != nzx2) sf_error("Need n1=%d in left",nzx2);
if (!sf_histint(left,"n2",&m2)) sf_error("Need n2= in left");
if (!sf_histint(right,"n1",&n2) || n2 != m2) sf_error("Need n1=%d in right",m2);
if (!sf_histint(right,"n2",&n2) || n2 != nk) sf_error("Need n2=%d in right",nk);
lt = sf_floatalloc2(nzx2,m2);
rt = sf_floatalloc2(m2,nk);
sf_floatread(lt[0],nzx2*m2,left);
sf_floatread(rt[0],m2*nk,right);
dd=sf_floatalloc3(nz, nx, ntau);
mm=sf_floatalloc3(nz, nx, ntau);
v0=sf_floatalloc2(nz2, nx2);
curr=sf_floatalloc(fnzx);
prev=sf_floatalloc(fnzx);
/* broad cast input time-shift gather */
if(cpuid==0) sf_floatread(dd[0][0], ntau*nx*nz, tgather);
for(itau=0; itau<ntau; itau++){
MPI_Bcast(dd[itau][0], nx*nz, MPI_FLOAT, 0, comm);
}
/* initialize corrected time-shift gather */
#ifdef _OPENMP
#pragma omp parallel for private(itau, ix, iz)
#endif
for(itau=0; itau<ntau; itau++)
for(ix=0; ix<nx; ix++)
for(iz=0; iz<nz; iz++)
mm[itau][ix][iz]=0.;
/* initialize functions */
lrinit(nx2, nz2, m2, cmplx, pad1, nb, par, abc, lt, rt, taper, thresh, dz, dx);
/* tau loop */
for(itau=cpuid; itau<ntau; itau+=numprocs){
sf_warning("itau=%d/%d", itau+1, ntau);
tau=tau0+itau*dtau;
// tau=0
if(itau==(ntau-1)/2){
for(ix=0; ix<nx; ix++)
for(iz=0; iz<nz; iz++)
mm[itau][ix][iz]=dd[itau][ix][iz];
continue;
}
// calculate v0 (derivative with respect to tau)
zero2(v0, nz2, nx2);
if(itau==0){
for(ix=0; ix<nx; ix++){
for(iz=0; iz<nz; iz++){
v0[ix+nb][iz+nb]=(dd[1][ix][iz]-dd[0][ix][iz])/dtau;
}
}
} else if (itau==ntau-1){
for(ix=0; ix<nx; ix++){
for(iz=0; iz<nz; iz++){
v0[ix+nb][iz+nb]=(dd[ntau-1][ix][iz]-dd[ntau-2][ix][iz])/dtau;
}
}
} else {
#ifdef _OPENMP
#pragma omp parallel for private(ix, iz)
#endif
for(ix=0; ix<nx; ix++){
for(iz=0; iz<nz; iz++){
v0[ix+nb][iz+nb]=(dd[itau+1][ix][iz]-dd[itau-1][ix][iz])/dtau/2.0;
}
}
}
// calculate u1
zero1(curr, fnzx);
zero1(prev, fnzx);
#ifdef _OPENMP
#pragma omp parallel for private(ix, iz)
#endif
for(ix=0; ix<nx; ix++)
for(iz=0; iz<nz; iz++)
curr[(ix+nb)*fnz+iz+nb]=dd[itau][ix][iz];
// tau>0
if(itau>(ntau-1)/2){
// calculate u(t-lt)
for (ix=0; ix<nx2; ix++)
for (iz=0; iz<nz2; iz++)
prev[ix*fnz+iz]=2.*v0[ix][iz]*dt;
lrupdate(curr,prev);
for (ix=0; ix<fnzx; ix++)
curr[ix]=curr[ix]/2.;
// it loop
nt=tau/dt+0.5;
for(it=1; it<nt; it++){
// sf_warning("it=%d/%d;", it+1, nt);
lrupdate(curr,prev);
} //end of it
#ifdef _OPENMP
#pragma omp parallel for private(ix, iz)
#endif
for(ix=0; ix<nx; ix++){
for(iz=0; iz<nz; iz++){
mm[itau][ix][iz]=curr[(ix+nb)*fnz+iz+nb];
}
}
} // end of positive tau
// tau<0
if(itau<(ntau-1)/2){
//calculate u(t+lt)
for (ix=0; ix<nx2; ix++)
for(iz=0; iz<nz2; iz++)
prev[ix*fnz+iz]=-2.*v0[ix][iz]*dt;
lrupdate(curr, prev);
for (ix=0; ix<fnzx; ix++)
curr[ix]=curr[ix]/2.;
// it loop
nt=-tau/dt+0.5;
for(it=1; it<nt; it++){
//sf_warning("it=%d/%d;", it+1, nt);
lrupdate(curr, prev);
}//end of it
#ifdef _OPENMP
#pragma omp parallel for private(ix, iz)
#endif
for(ix=0; ix<nx; ix++){
for(iz=0; iz<nz; iz++){
mm[itau][ix][iz]=curr[(ix+nb)*fnz+iz+nb];
}
}
}// end of negative tau
} //end of itau
MPI_Barrier(comm);
/* corrected time-shift gather reduction */
for(itau=0; itau<ntau; itau++){
if(cpuid==0){
sendbuf=MPI_IN_PLACE;
recvbuf=mm[itau][0];
}else{
sendbuf=mm[itau][0];
recvbuf=NULL;
}
MPI_Reduce(sendbuf, recvbuf, nz*nx, MPI_FLOAT, MPI_SUM, 0, comm);
}
if(cpuid==0) sf_floatwrite(mm[0][0], ntau*nz*nx, cgather);
lrclose();
MPI_Finalize();
}
