Esempio n. 1
0
int
main(int argc, char **argv)
{
  int nb_th=1;
  double dt = 0;
  long nvtk = 0;
  char outnum[80];
  long time_output = 0;
  
  // double output_time = 0.0;
  double next_output_time = 0;
  double start_time = 0, end_time = 0;
  double start_iter = 0, end_iter = 0;
  double elaps = 0;

  start_time = cclock();
  process_args(argc, argv, &H);
  hydro_init(&H, &Hv);
  PRINTUOLD(H, &Hv);
  
  printf("Hydro starts - sequential version \n");

  // vtkfile(nvtk, H, &Hv);
  if (H.dtoutput > 0) 
    {	
      // outputs are in physical time not in time steps
      time_output = 1;
      next_output_time = next_output_time + H.dtoutput;
    }

  while ((H.t < H.tend) && (H.nstep < H.nstepmax)) 
    {	
      start_iter = cclock();
      outnum[0] = 0;
      flops = 0;
      if ((H.nstep % 2) == 0) 
	{
	  compute_deltat(&dt, H, &Hw, &Hv, &Hvw);
	  if (H.nstep == 0) {
	    dt = dt / 2.0;
	  }
	}
      
      if ((H.nstep % 2) == 0) {
	hydro_godunov(1, dt, H, &Hv, &Hw, &Hvw);
	hydro_godunov(2, dt, H, &Hv, &Hw, &Hvw); 
      } else {
	hydro_godunov(2, dt, H, &Hv, &Hw, &Hvw);
	hydro_godunov(1, dt, H, &Hv, &Hw, &Hvw); 
      }
      
      end_iter = cclock();
      H.nstep++;
      H.t += dt;
      
      if (flops > 0) {
	double iter_time = (double) (end_iter - start_iter);
	if (iter_time > 1.e-9) {
	  double mflops = (double) flops / (double) 1.e+6 / iter_time;
	  sprintf(outnum, "%s {%.3f Mflops} (%.3fs)", outnum, mflops, iter_time);
	}
      } else {
	double iter_time = (double) (end_iter - start_iter);
	sprintf(outnum, "%s (%.3fs)", outnum, iter_time);
      }
      if (time_output == 0) {
	if ((H.nstep % H.noutput) == 0) {
	  vtkfile(++nvtk, H, &Hv);
	  sprintf(outnum, "%s [%04ld]", outnum, nvtk);
	}
      } else {
	if (H.t >= next_output_time) {
	  vtkfile(++nvtk, H, &Hv);
	  next_output_time = next_output_time + H.dtoutput;
	  sprintf(outnum, "%s [%04ld]", outnum, nvtk);
	}
      }
	fprintf(stdout, "--> step=%-4ld %12.5e, %10.5e %s\n", H.nstep, H.t, dt, outnum);
    }   // end while loop
  hydro_finish(H, &Hv);
  end_time = cclock();
  elaps = (double) (end_time - start_time);
  timeToString(outnum, elaps); 
  
  fprintf(stdout, "Hydro ends in %ss (%.3lf).\n", outnum, elaps);
  
return 0;
}
Esempio n. 2
0
void
oclHydroGodunov(long idimStart, real_t dt, const hydroparam_t H, hydrovar_t * Hv, hydrowork_t * Hw, hydrovarwork_t * Hvw)
{
  cl_int status;
  // Local variables
  struct timespec start, end;
  int i, j, idim, idimIndex;
  int Hmin, Hmax, Hstep, Hnxystep;
  int Hdimsize;
  int Hndim_1;
  int slices, iend;
  real_t dtdx;
  size_t lVarSz = H.arVarSz * H.nxystep * sizeof(real_t);
  long Hnxyt = H.nxyt;
  int clear = 0;
  static FILE *fic = NULL;

  if (fic == NULL && H.prt) {
    char logname[256];
    sprintf(logname, "TRACE.%04d_%04d.txt", H.nproc, H.mype);
    fic = fopen(logname, "w");
  }

  WHERE("hydro_godunov");
  if (H.prt) fprintf(fic, "loop dt=%lg\n", dt);

  for (idimIndex = 0; idimIndex < 2; idimIndex++) {
    idim = (idimStart - 1 + idimIndex) % 2 + 1;
    // constant
    // constant
    dtdx = dt / H.dx;

    // Update boundary conditions
    if (H.prt) {
      fprintf(fic, "godunov %d\n", idim);
      PRINTUOLD(fic, H, Hv);
    }
#define GETUOLD oclGetUoldFromDevice(H, Hv)
    start = cclock();
    oclMakeBoundary(idim, H, Hv, uoldDEV);
    end = cclock();
    functim[TIM_MAKBOU] += ccelaps(start, end);
    if (H.prt) {fprintf(fic, "MakeBoundary\n");}
    if (H.prt) {GETUOLD; PRINTUOLD(fic, H, Hv);}

    if (idim == 1) {
      Hmin = H.jmin + ExtraLayer;
      Hmax = H.jmax - ExtraLayer;
      Hdimsize = H.nxt;
      Hndim_1 = H.nx + 1;
      Hstep = H.nxystep;
    } else {
      Hmin = H.imin + ExtraLayer;
      Hmax = H.imax - ExtraLayer;
      Hdimsize = H.nyt;
      Hndim_1 = H.ny + 1;
      Hstep = H.nxystep;
    }
    Hnxystep = Hstep;
    for (i = Hmin; i < Hmax; i += Hstep) {
      long offsetIP = IHVWS(0, 0, IP);
      long offsetID = IHVWS(0, 0, ID);
      int Hnxyt = H.nxyt;
      iend = i + Hstep;
      if (iend >= Hmax) iend = Hmax;
      slices = iend - i;

      if (clear) oclMemset(uDEV, 0, lVarSz);
      start = cclock();
      oclGatherConservativeVars(idim, i, H.imin, H.imax, H.jmin, H.jmax, H.nvar, H.nxt, H.nyt, H.nxyt, slices, Hnxystep, uoldDEV, uDEV);
      end = cclock();
      functim[TIM_GATCON] += ccelaps(start, end);
      if (H.prt) {fprintf(fic, "ConservativeVars %ld %ld %ld %ld %d %d\n", H.nvar, H.nxt, H.nyt, H.nxyt, slices, Hstep);}
      if (H.prt) { GETARRV(uDEV, Hvw->u); }
      PRINTARRAYV2(fic, Hvw->u, Hdimsize, "u", H);

      // Convert to primitive variables
      start = cclock();
      oclConstoprim(Hdimsize, H.nxyt, H.nvar, H.smallr, slices, Hnxystep, uDEV, qDEV, eDEV);
      end = cclock();
      functim[TIM_CONPRI] += ccelaps(start, end);
      if (H.prt) { GETARR (eDEV, Hw->e); }
      if (H.prt) { GETARRV(qDEV, Hvw->q); }
      PRINTARRAY(fic, Hw->e, Hdimsize, "e", H);
      PRINTARRAYV2(fic, Hvw->q, Hdimsize, "q", H);

      start = cclock();
      oclEquationOfState(offsetIP, offsetID, 0, Hdimsize, H.smallc, H.gamma, slices, H.nxyt, qDEV, eDEV, cDEV);
      end = cclock();
      functim[TIM_EOS] += ccelaps(start, end);
      if (H.prt) { GETARR (cDEV, Hw->c); }
      PRINTARRAY(fic, Hw->c, Hdimsize, "c", H);
      if (H.prt) { GETARRV (qDEV, Hvw->q); }
      PRINTARRAYV2(fic, Hvw->q, Hdimsize, "q", H);

      if (clear) oclMemset(dqDEV, 0, H.arVarSz * H.nxystep);
      // Characteristic tracing
      if (H.iorder != 1) {
	if (clear) oclMemset(dqDEV, 0, H.arVarSz);
	start = cclock();
        oclSlope(Hdimsize, H.nvar, H.nxyt, H.slope_type, slices, Hstep, qDEV, dqDEV);
	end = cclock();
	functim[TIM_SLOPE] += ccelaps(start, end);
	if (H.prt) { GETARRV(dqDEV, Hvw->dq); }
	PRINTARRAYV2(fic, Hvw->dq, Hdimsize, "dq", H);
      }
      start = cclock();
      oclTrace(dtdx, Hdimsize, H.scheme, H.nvar, H.nxyt, slices, Hstep, qDEV, dqDEV, cDEV, qxmDEV, qxpDEV);
      end = cclock();
      functim[TIM_TRACE] += ccelaps(start, end);
      if (H.prt) { GETARRV(qxmDEV, Hvw->qxm); }
      if (H.prt) { GETARRV(qxpDEV, Hvw->qxp); }
      PRINTARRAYV2(fic, Hvw->qxm, Hdimsize, "qxm", H);
      PRINTARRAYV2(fic, Hvw->qxp, Hdimsize, "qxp", H);
      start = cclock();
      oclQleftright(idim, H.nx, H.ny, H.nxyt, H.nvar, slices, Hstep, qxmDEV, qxpDEV, qleftDEV, qrightDEV);
      end = cclock();
      functim[TIM_QLEFTR] += ccelaps(start, end);
      if (H.prt) { GETARRV(qleftDEV, Hvw->qleft); }
      if (H.prt) { GETARRV(qrightDEV, Hvw->qright); }
      PRINTARRAYV2(fic, Hvw->qleft, Hdimsize, "qleft", H);
      PRINTARRAYV2(fic, Hvw->qright, Hdimsize, "qright", H);

      // Solve Riemann problem at interfaces
      start = cclock();
      oclRiemann(Hndim_1, H.smallr, H.smallc, H.gamma, H.niter_riemann, H.nvar, H.nxyt, slices, Hstep,
		 qleftDEV, qrightDEV, qgdnvDEV,sgnmDEV);
      end = cclock();
      functim[TIM_RIEMAN] += ccelaps(start, end);
      if (H.prt) { GETARRV(qgdnvDEV, Hvw->qgdnv); }
      PRINTARRAYV2(fic, Hvw->qgdnv, Hdimsize, "qgdnv", H);
      // Compute fluxes
      if (clear) oclMemset(fluxDEV, 0, H.arVarSz);
      start = cclock();
      oclCmpflx(Hdimsize, H.nxyt, H.nvar, H.gamma, slices, Hnxystep, qgdnvDEV, fluxDEV);
      end = cclock();
      functim[TIM_CMPFLX] += ccelaps(start, end);
      if (H.prt) { GETARRV(fluxDEV, Hvw->flux); }
      PRINTARRAYV2(fic, Hvw->flux, Hdimsize, "flux", H);
      if (H.prt) { GETARRV(uDEV, Hvw->u); }
      PRINTARRAYV2(fic, Hvw->u, Hdimsize, "u", H);
      // if (H.prt) {
      // 	GETUOLD; PRINTUOLD(fic, H, Hv);
      // }
      if (H.prt) fprintf(fic, "dxdt=%lg\n", dtdx);
      start = cclock();
      oclUpdateConservativeVars(idim, i, dtdx, H.imin, H.imax, H.jmin, H.jmax, H.nvar, H.nxt, H.nyt, H.nxyt, slices, Hnxystep, 
				uoldDEV, uDEV, fluxDEV);
      end = cclock();
      functim[TIM_UPDCON] += ccelaps(start, end);
      if (H.prt) {
	GETUOLD; PRINTUOLD(fic, H, Hv);
      }
    }                           // for j

    if (H.prt) {
      // printf("After pass %d\n", idim);
      PRINTUOLD(fic, H, Hv);
    }
  } 
}                               // hydro_godunov
Esempio n. 3
0
void
hydro_godunov(long idim, double dt, const hydroparam_t H, hydrovar_t * Hv, hydrowork_t * Hw, hydrovarwork_t * Hvw)
{

  // Local variables
  long i, j;
  double dtdx;

  double *dq;
  double *e;
  double *flux;
  double *q;
  double *qleft, *qright;
  double *qxm, *qxp;
  double *u;
  double *c;
  double *uold;
  double *rl, *ul, *pl, *cl, *wl, *rr, *ur, *pr, *cr, *wr, *ro, *uo, *po, *co, *wo,
    *rstar, *ustar, *pstar, *cstar, *spin, *spout, *ushock, *frac, *scr, *delp, *pold;
  long *sgnm, *ind, *ind2;
  double *qgdnv;

  WHERE("hydro_godunov");

  // constant
  dtdx = dt / H.dx;

  // Update boundary conditions
  if (H.prt) {
    fprintf(stdout, "godunov %ld\n", idim);
    PRINTUOLD(H, Hv);
  }
  make_boundary(idim, H, Hv);
  PRINTUOLD(H, Hv);

  // Allocate work space for 1D sweeps
  allocate_work_space(H, Hw, Hvw);
  uold = Hv->uold;
  qgdnv = Hvw->qgdnv;
  flux = Hvw->flux;
  c = Hw->c;
  q = Hvw->q;
  e = Hw->e;
  u = Hvw->u;
  qxm = Hvw->qxm;
  qxp = Hvw->qxp;
  qleft = Hvw->qleft;
  qright = Hvw->qright;
  dq = Hvw->dq;
  rl = Hw->rl;
  ul = Hw->ul;
  pl = Hw->pl;
  cl = Hw->cl;
  wl = Hw->wl;
  rr = Hw->rr;
  ur = Hw->ur;
  pr = Hw->pr;
  cr = Hw->cr;
  wr = Hw->wr;
  ro = Hw->ro;
  uo = Hw->uo;
  po = Hw->po;
  co = Hw->co;
  wo = Hw->wo;
  rstar = Hw->rstar;
  ustar = Hw->ustar;
  pstar = Hw->pstar;
  cstar = Hw->cstar;
  sgnm = Hw->sgnm;
  spin = Hw->spin;
  spout = Hw->spout;
  ushock = Hw->ushock;
  frac = Hw->frac;
  scr = Hw->scr;
  delp = Hw->delp;
  pold = Hw->pold;
  ind = Hw->ind;
  ind2 = Hw->ind2;

  if (idim == 1) {
    for (j = H.jmin + ExtraLayer; j < H.jmax - ExtraLayer; j++) {
      double *qID = &q[IHvw(0, ID)];
      double *qIP = &q[IHvw(0, IP)];
      gatherConservativeVars(idim, j, uold, u, H.imin, H.imax, H.jmin, H.jmax, H.nvar, H.nxt, H.nyt, H.nxyt);

      // Convert to primitive variables
      constoprim(u, q, e, H.nxt, H.nxyt, H.nvar, H.smallr);
      equation_of_state(qID, e, qIP, c, 0, H.nxt, H.smallc, H.gamma);
      Dmemset(dq, 0, (H.nxyt + 2) * H.nvar);

      // Characteristic tracing
      if (H.iorder != 1) {
        slope(q, dq, H.nxt, H.nvar, H.nxyt, H.slope_type);
      }
      trace(q, dq, c, qxm, qxp, dtdx, H.nxt, H.scheme, H.nvar, H.nxyt);
      qleftright(idim, H.nx, H.ny, H.nxyt, H.nvar, qxm, qxp, qleft, qright);

      // Solve Riemann problem at interfaces
      riemann(qleft, qright, qgdnv,
              rl, ul, pl, cl, wl, rr, ur, pr, cr, wr, ro, uo, po, co, wo,
              rstar, ustar, pstar, cstar,
              sgnm, spin, spout, ushock, frac,
              scr, delp, pold, ind, ind2, H.nx + 1, H.smallr, H.smallc, H.gamma, H.niter_riemann, H.nvar, H.nxyt);

      // Compute fluxes
      cmpflx(qgdnv, flux, H.nxt, H.nxyt, H.nvar, H.gamma);
      updateConservativeVars(idim, j, dtdx, uold, u, flux, H.imin, H.imax, H.jmin, H.jmax, H.nvar, H.nxt, H.nyt, H.nxyt);
    }                           // for j

    if (H.prt) {
      printf("After pass %ld\n", idim);
      PRINTUOLD(H, Hv);
    }
  } else {
    for (i = H.imin + ExtraLayer; i < H.imax - ExtraLayer; i++) {
      double *qID = &Hvw->q[IHvw(0, ID)];
      double *qIP = &Hvw->q[IHvw(0, IP)];
      gatherConservativeVars(idim, i, uold, u, H.imin, H.imax, H.jmin, H.jmax, H.nvar, H.nxt, H.nyt, H.nxyt);
      PRINTARRAYV(Hvw->u, H.nyt, "uY", H);

      // Convert to primitive variables
      constoprim(u, q, e, H.nyt, H.nxyt, H.nvar, H.smallr);

      equation_of_state(qID, e, qIP, c, 0, H.nyt, H.smallc, H.gamma);
      PRINTARRAY(Hw->c, H.nyt, "cY", H);

      // Characteristic tracing
      // compute slopes
      Dmemset(dq, 0, H.nyt * H.nvar);
      if (H.iorder != 1) {
        slope(q, dq, H.nyt, H.nvar, H.nxyt, H.slope_type);
      }
      PRINTARRAYV(Hvw->dq, H.nyt, "dqY", H);
      trace(q, dq, c, qxm, qxp, dtdx, H.nyt, H.scheme, H.nvar, H.nxyt);
      qleftright(idim, H.nx, H.ny, H.nxyt, H.nvar, qxm, qxp, qleft, qright);
      PRINTARRAYV(Hvw->qleft, H.ny + 1, "qleftY", H);
      PRINTARRAYV(Hvw->qright, H.ny + 1, "qrightY", H);

      // Solve Riemann problem at interfaces
      riemann(qleft, qright, qgdnv, rl, ul,
              pl, cl, wl, rr, ur, pr,
              cr, wr, ro, uo, po, co,
              wo, rstar, ustar, pstar, cstar,
              sgnm, spin, spout, ushock, frac,
              scr, delp, pold, ind, ind2, H.ny + 1, H.smallr, H.smallc, H.gamma, H.niter_riemann, H.nvar, H.nxyt);

      // Compute fluxes
      cmpflx(qgdnv, flux, H.nyt, H.nxyt, H.nvar, H.gamma);
      PRINTARRAYV(Hvw->flux, H.ny + 1, "fluxY", H);
      // updateConservativeVars(idim, i, dtdx, H, Hv, Hvw);
      updateConservativeVars(idim, i, dtdx, uold, u, flux, H.imin, H.imax, H.jmin, H.jmax, H.nvar, H.nxt, H.nyt, H.nxyt);
    }                           // else
    if (H.prt) {
      printf("After pass %ld\n", idim);
      PRINTUOLD(H, Hv);
    }
  }
  // Deallocate work space
  deallocate_work_space(H, Hw, Hvw);
}                               // hydro_godunov
Esempio n. 4
0
// variables auxiliaires pour mettre en place le mode resident de HMPP
void
hydro_godunov(int idimStart, real_t dt, const hydroparam_t H, hydrovar_t * Hv, hydrowork_t * Hw, hydrovarwork_t * Hvw) {
  // Local variables
  struct timespec start, end;
  int j;
  real_t dtdx;
  int clear=0;

  real_t (*e)[H.nxyt];
  real_t (*flux)[H.nxystep][H.nxyt];
  real_t (*qleft)[H.nxystep][H.nxyt];
  real_t (*qright)[H.nxystep][H.nxyt];
  real_t (*c)[H.nxyt];
  real_t *uold;
  int (*sgnm)[H.nxyt];
  real_t (*qgdnv)[H.nxystep][H.nxyt];
  real_t (*u)[H.nxystep][H.nxyt];
  real_t (*qxm)[H.nxystep][H.nxyt];
  real_t (*qxp)[H.nxystep][H.nxyt];
  real_t (*q)[H.nxystep][H.nxyt];
  real_t (*dq)[H.nxystep][H.nxyt];

  static FILE *fic = NULL;

  if (fic == NULL && H.prt == 1) {
    char logname[256];
    sprintf(logname, "TRACE.%04d_%04d.txt", H.nproc, H.mype);
    fic = fopen(logname, "w");
  }

  WHERE("hydro_godunov");

  // int hmppGuard = 1;
  int idimIndex = 0;

  for (idimIndex = 0; idimIndex < 2; idimIndex++) {
    int idim = (idimStart - 1 + idimIndex) % 2 + 1;
    // constant
    dtdx = dt / H.dx;

    // Update boundary conditions
    if (H.prt) {
      fprintf(fic, "godunov %d\n", idim);
      PRINTUOLD(fic, H, Hv);
    }
    // if (H.mype == 1) fprintf(fic, "Hydro makes boundary.\n");
    start = cclock();
    make_boundary(idim, H, Hv);
    end = cclock();
    functim[TIM_MAKBOU] += ccelaps(start, end);

    if (H.prt) {fprintf(fic, "MakeBoundary\n");}
    PRINTUOLD(fic, H, Hv);

    uold = Hv->uold;
    qgdnv = (real_t (*)[H.nxystep][H.nxyt]) Hvw->qgdnv;
    flux = (real_t (*)[H.nxystep][H.nxyt]) Hvw->flux;
    c = (real_t (*)[H.nxyt]) Hw->c;
    e = (real_t (*)[H.nxyt]) Hw->e;
    qleft = (real_t (*)[H.nxystep][H.nxyt]) Hvw->qleft;
    qright = (real_t (*)[H.nxystep][H.nxyt]) Hvw->qright;
    sgnm = (int (*)[H.nxyt]) Hw->sgnm;
    q = (real_t (*)[H.nxystep][H.nxyt]) Hvw->q;
    dq = (real_t (*)[H.nxystep][H.nxyt]) Hvw->dq;
    u = (real_t (*)[H.nxystep][H.nxyt]) Hvw->u;
    qxm = (real_t (*)[H.nxystep][H.nxyt]) Hvw->qxm;
    qxp = (real_t (*)[H.nxystep][H.nxyt]) Hvw->qxp;

    int Hmin, Hmax, Hstep;
    int Hdimsize;
    int Hndim_1;

    if (idim == 1) {
      Hmin = H.jmin + ExtraLayer;
      Hmax = H.jmax - ExtraLayer;
      Hdimsize = H.nxt;
      Hndim_1 = H.nx + 1;
      Hstep = H.nxystep;
    } else {
      Hmin = H.imin + ExtraLayer;
      Hmax = H.imax - ExtraLayer;
      Hdimsize = H.nyt;
      Hndim_1 = H.ny + 1;
      Hstep = H.nxystep;
    }

    if (!H.nstep && idim == 1) {
      /* LM -- HERE a more secure implementation should be used: a new parameter ? */
    }
    // if (H.mype == 1) fprintf(fic, "Hydro computes slices.\n");
    for (j = Hmin; j < Hmax; j += Hstep) {
      // we try to compute many slices each pass
      int jend = j + Hstep;
      if (jend >= Hmax)
        jend = Hmax;
      int slices = jend - j;    // numbre of slices to compute
      // fprintf(stderr, "Godunov idim=%d, j=%d %d \n", idim, j, slices);

      if (clear) Dmemset((H.nxyt) * H.nxystep * H.nvar, (real_t *) dq, 0);
      start = cclock();
      gatherConservativeVars(idim, j, H.imin, H.imax, H.jmin, H.jmax, H.nvar, H.nxt, H.nyt, H.nxyt, slices, Hstep, uold,
                             u);
      end = cclock();
      functim[TIM_GATCON] += ccelaps(start, end);
      if (H.prt) {fprintf(fic, "ConservativeVars %d %d %d %d %d %d\n", H.nvar, H.nxt, H.nyt, H.nxyt, slices, Hstep);}
      PRINTARRAYV2(fic, u, Hdimsize, "u", H);

      if (clear) Dmemset((H.nxyt) * H.nxystep * H.nvar, (real_t *) dq, 0);

      // Convert to primitive variables
      start = cclock();
      constoprim(Hdimsize, H.nxyt, H.nvar, H.smallr, slices, Hstep, u, q, e);
      end = cclock();
      functim[TIM_CONPRI] += ccelaps(start, end);
      PRINTARRAY(fic, e, Hdimsize, "e", H);
      PRINTARRAYV2(fic, q, Hdimsize, "q", H);

      start = cclock();
      equation_of_state(0, Hdimsize, H.nxyt, H.nvar, H.smallc, H.gamma, slices, Hstep, e, q, c);
      end = cclock();
      functim[TIM_EOS] += ccelaps(start, end);
      PRINTARRAY(fic, c, Hdimsize, "c", H);
      PRINTARRAYV2(fic, q, Hdimsize, "q", H);

      // Characteristic tracing
      if (H.iorder != 1) {
	start = cclock();
        slope(Hdimsize, H.nvar, H.nxyt, H.slope_type, slices, Hstep, q, dq);
	end = cclock();
	functim[TIM_SLOPE] += ccelaps(start, end);
        PRINTARRAYV2(fic, dq, Hdimsize, "dq", H);
      }

      if (clear) Dmemset(H.nxyt * H.nxystep * H.nvar, (real_t *) qxm, 0);
      if (clear) Dmemset(H.nxyt * H.nxystep * H.nvar, (real_t *) qxp, 0);
      if (clear) Dmemset(H.nxyt * H.nxystep * H.nvar, (real_t *) qleft, 0);
      if (clear) Dmemset(H.nxyt * H.nxystep * H.nvar, (real_t *) qright, 0);
      if (clear) Dmemset(H.nxyt * H.nxystep * H.nvar, (real_t *) flux, 0);
      if (clear) Dmemset(H.nxyt * H.nxystep * H.nvar, (real_t *) qgdnv, 0);
      start = cclock();
      trace(dtdx, Hdimsize, H.scheme, H.nvar, H.nxyt, slices, Hstep, q, dq, c, qxm, qxp);
      end = cclock();
      functim[TIM_TRACE] += ccelaps(start, end);
      PRINTARRAYV2(fic, qxm, Hdimsize, "qxm", H);
      PRINTARRAYV2(fic, qxp, Hdimsize, "qxp", H);

      start = cclock();
      qleftright(idim, H.nx, H.ny, H.nxyt, H.nvar, slices, Hstep, qxm, qxp, qleft, qright);
      end = cclock();
      functim[TIM_QLEFTR] += ccelaps(start, end);
      PRINTARRAYV2(fic, qleft, Hdimsize, "qleft", H);
      PRINTARRAYV2(fic, qright, Hdimsize, "qright", H);

      start = cclock();
      riemann(Hndim_1, H.smallr, H.smallc, H.gamma, H.niter_riemann, H.nvar, H.nxyt, slices, Hstep, qleft, qright, qgdnv, sgnm, Hw);
      end = cclock();
      functim[TIM_RIEMAN] += ccelaps(start, end);
      PRINTARRAYV2(fic, qgdnv, Hdimsize, "qgdnv", H);

      start = cclock();
      cmpflx(Hdimsize, H.nxyt, H.nvar, H.gamma, slices, Hstep, qgdnv, flux);
      end = cclock();
      functim[TIM_CMPFLX] += ccelaps(start, end);
      PRINTARRAYV2(fic, flux, Hdimsize, "flux", H);
      PRINTARRAYV2(fic, u, Hdimsize, "u", H);

      start = cclock();
      updateConservativeVars(idim, j, dtdx, H.imin, H.imax, H.jmin, H.jmax, H.nvar, H.nxt, H.nyt, H.nxyt, slices, Hstep,
                             uold, u, flux);
      end = cclock();
      functim[TIM_UPDCON] += ccelaps(start, end);
      PRINTUOLD(fic, H, Hv);
    }                           // for j

    if (H.prt) {
      // printf("[%d] After pass %d\n", H.mype, idim);
      PRINTUOLD(fic, H, Hv);
    }
  }

  if ((H.t + dt >= H.tend) || (H.nstep + 1 >= H.nstepmax)) {
    /* LM -- HERE a more secure implementation should be used: a new parameter ? */
  }

}                               // hydro_godunov