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calc_dt_kernel_ocl.C
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calc_dt_kernel_ocl.C
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/*Crown Copyright 2012 AWE.
*
* This file is part of CloverLeaf.
*
* CloverLeaf is free software: you can redistribute it and/or modify it under
* the terms of the GNU General Public License as published by the
* Free Software Foundation, either version 3 of the License, or (at your option)
* any later version.
*
* CloverLeaf is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License along with
* CloverLeaf. If not, see http://www.gnu.org/licenses/. */
/**
* @brief OCL host-side timestep calculation kernel.
* @author Andrew Mallinson, David Beckingsale
* @details Launches the OCL device-side timestep calculation kernel
*/
#include "CloverCL.h"
#include <iostream>
#include <sys/time.h>
#define ARRAY1D(i_index,i_lb) ((i_index)-(i_lb))
#define ARRAY2D(i_index,j_index,i_size,i_lb,j_lb) ((i_size)*(j_index-(j_lb))+(i_index)-(i_lb))
extern "C" void calc_dt_kernel_ocl_(int *xmin, int *xmax,
int *ymin, int *ymax,
double *dtmin,
//double *cellx, double *celly,
//double *density0, double *energy0,
//double *pressure, double *viscosity,
//double *soundspeed, double *xvel0,
//double *yvel0,
double *dt_min_val, int *dtl_control,
double *xl_pos, double *yl_pos,
int *jldt, int *kldt,
int *small);
void calc_dt_kernel_ocl_(int *xmin, int *xmax,
int *ymin, int *ymax,
double *dtmin,
//double *cellx, double *celly,
//double *density0, double *energy0,
//double *pressure, double *viscosity,
//double *soundspeed, double *xvel0,
//double *yvel0,
double *dt_min_val, int *dtl_control,
double *xl_pos, double *yl_pos,
int *jldt, int *kldt,
int *small)
{
double jk_control=1.1;
cl_int err;
#ifdef OCL_VERBOSE
std::cout << "[CloverCL] -> in dt_calc_kernel_ocl.C..." << std::endl;
#endif
#if PROFILE_OCL_KERNELS
timeval t_start;
gettimeofday(&t_start, NULL);
#endif
/*
* Run the calc dt kernel
*/
CloverCL::enqueueKernel_nooffsets_localwg(CloverCL::dt_calc_knl, *xmax+2, *ymax+2,
CloverCL::local_wg_x_calcdt_fieldsumm, CloverCL::local_wg_y_calcdt_fieldsumm);
// Run the reduction kernels
try {
for (int i=1; i<=CloverCL::number_of_red_levels; i++) {
#ifdef OCL_VERBOSE
std::cout << "Entering DT calc reduction level: " << i << std::endl;
#endif
err = CloverCL::queue.enqueueNDRangeKernel(CloverCL::min_reduction_kernels[i-1], cl::NullRange,
cl::NDRange(CloverCL::num_workitems_tolaunch[i-1]),
cl::NDRange(CloverCL::num_workitems_per_wg[i-1]),
NULL, NULL);
}
//clfinish required to force execution of the above reduction kernels
//as without this experience a large slowdown at least on Nvidia
CloverCL::queue.finish();
} catch(cl::Error err) {
CloverCL::reportError(err, "[CloverCL] ERROR: at min reduction kernel launch in loop");
}
/*
* Read data back with a blocking read
*/
try {
err = CloverCL::queue.enqueueReadBuffer(CloverCL::dt_min_val_buffer, CL_TRUE, 0,
sizeof(double), dt_min_val, NULL, NULL);
} catch(cl::Error err) {
CloverCL::reportError(err, "[CloverCL] ERROR: at dt_calc_knl read data back stage");
}
// Extract the mimimum timestep information
*dtl_control = (int) (10.01*(jk_control - ((int) jk_control) ) );
jk_control = jk_control-(jk_control- (int) jk_control);
*jldt = ((int) jk_control) % *xmax;
*kldt = (int) 1+(jk_control / *xmax);
//*xl_pos = cellx[ARRAY1D(*jldt, *xmin-2)];
//*yl_pos = celly[ARRAY1D(*kldt, *ymin-2)];
if (*dt_min_val < *dtmin) { *small=1; }
if (*small != 0) {
//try {
// err = CloverCL::queue.enqueueReadBuffer(CloverCL::xvel0_buffer, CL_TRUE, 0,
// (*xmax+5)*(*ymax+5)*sizeof(double), xvel0, NULL, NULL);
// err = CloverCL::queue.enqueueReadBuffer(CloverCL::yvel0_buffer, CL_TRUE, 0,
// (*xmax+5)*(*ymax+5)*sizeof(double), yvel0, NULL, NULL);
// err = CloverCL::queue.enqueueReadBuffer(CloverCL::density0_buffer, CL_TRUE, 0,
// (*xmax+4)*(*ymax+4)*sizeof(double), density0, NULL, NULL);
// err = CloverCL::queue.enqueueReadBuffer(CloverCL::energy0_buffer, CL_TRUE, 0,
// (*xmax+4)*(*ymax+4)*sizeof(double), energy0, NULL, NULL);
// err = CloverCL::queue.enqueueReadBuffer(CloverCL::pressure_buffer, CL_TRUE, 0,
// (*xmax+4)*(*ymax+4)*sizeof(double), pressure, NULL, NULL);
// err = CloverCL::queue.enqueueReadBuffer(CloverCL::soundspeed_buffer, CL_TRUE, 0,
// (*xmax+4)*(*ymax+4)*sizeof(double), soundspeed, NULL, NULL);
//} catch(cl::Error err) {
// CloverCL::reportError(err, "[CloverCL] ERROR: at dt_calc_knl read data back stage 2");
//}
std::cout << "Timestep information:" << std::endl;
std::cout << "j, k : " << *jldt << " " << *kldt << std::endl;
//std::cout << "x, y : " << cellx[ARRAY1D(*jldt,*xmin-2)] << " " << celly[ARRAY1D(*kldt,*ymin-2)] << std::endl;
std::cout << "timestep : " << *dt_min_val << std::endl;
std::cout << "dt_min : " << *dtmin << std::endl;
//std::cout << "Cell velocities;" << std::endl;
//std::cout << xvel0[ARRAY2D(*jldt , *kldt , *xmax+5, *xmin-2, *ymin-2)] << " " << yvel0[ARRAY2D(*jldt , *kldt , *xmax+5, *xmin-2, *ymin-2)] << std::endl;
//std::cout << xvel0[ARRAY2D(*jldt+1, *kldt , *xmax+5, *xmin-2, *ymin-2)] << " " << yvel0[ARRAY2D(*jldt+1, *kldt , *xmax+5, *xmin-2, *ymin-2)] << std::endl;
//std::cout << xvel0[ARRAY2D(*jldt+1, *kldt+1, *xmax+5, *xmin-2, *ymin-2)] << " " << yvel0[ARRAY2D(*jldt+1, *kldt+1 , *xmax+5, *xmin-2, *ymin-2)] << std::endl;
//std::cout << xvel0[ARRAY2D(*jldt , *kldt+1, *xmax+5, *xmin-2, *ymin-2)] << " " << yvel0[ARRAY2D(*jldt , *kldt+1 , *xmax+5, *xmin-2, *ymin-2)] << std::endl;
//std::cout << "density, energy, pressure, soundspeed " << std::endl;
//std::cout << density0[ARRAY2D(*jldt, *kldt, *xmax+4, *xmin-2, *ymin-2)] << " "
// << energy0[ARRAY2D(*jldt, *kldt, *xmax+4, *xmin-2, *ymin-2)] << " "
// << pressure[ARRAY2D(*jldt, *kldt, *xmax+4, *xmin-2, *ymin-2)] << " "
// << soundspeed[ARRAY2D(*jldt, *kldt, *xmax+4, *xmin-2, *ymin-2)] << std::endl;
}
#if PROFILE_OCL_KERNELS
timeval t_end;
CloverCL::queue.finish();
gettimeofday(&t_end, NULL);
CloverCL::calc_dt_time += (t_end.tv_sec * 1.0E6 + t_end.tv_usec) - (t_start.tv_sec * 1.0E6 + t_start.tv_usec);
CloverCL::calc_dt_count++;
#endif
#ifdef OCL_VERBOSE
std::cout << "[CloverCL] -> leaving dt_calc_kernel_ocl.C..." << std::endl;
#endif
}