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/*
* gpu_sim_check.c
*
* Check that GPU simulation agrees with CPU version
*
* (c) 2011 Thomas White <taw@physics.org>
*
* Part of CrystFEL - crystallography with a FEL
*
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <stdlib.h>
#include <stdio.h>
#include "../src/diffraction.h"
#include "../src/diffraction-gpu.h"
#include "../src/detector.h"
#include "../src/beam-parameters.h"
#include "../src/utils.h"
#ifdef HAVE_CLOCK_GETTIME
static double get_hires_seconds()
{
struct timespec tp;
clock_gettime(CLOCK_MONOTONIC, &tp);
return (double)tp.tv_sec + ((double)tp.tv_nsec/1e9);
}
#else
/* Fallback version of the above. The time according to gettimeofday() is not
* monotonic, so measuring intervals based on it will screw up if there's a
* timezone change (e.g. daylight savings) while the program is running. */
static double get_hires_seconds()
{
struct timeval tp;
gettimeofday(&tp, NULL);
return (double)tp.tv_sec + ((double)tp.tv_nsec/1e9);
}
#endif
int main(int argc, char *argv[])
{
struct gpu_context *gctx;
struct image gpu_image;
struct image cpu_image;
UnitCell *cell;
UnitCell *cell_raw;
struct detector *det;
struct beam_params *beam;
int i;
double gpu_min, gpu_max, gpu_tot;
double cpu_min, cpu_max, cpu_tot;
double dev, perc;
const double sep = 20.0;
double start, end;
double gpu_time, cpu_time;
gctx = setup_gpu(1, NULL, NULL, NULL, 0);
if ( gctx == NULL ) {
ERROR("Couldn't set up GPU.\n");
return 1;
}
cell_raw = cell_new_from_parameters(28.1e-9, 28.1e-9, 16.5e-9,
deg2rad(90.0), deg2rad(90.0), deg2rad(120.0));
cell = cell_rotate(cell_raw, random_quaternion());
gpu_image.width = 1024;
gpu_image.height = 1024;
cpu_image.width = 1024;
cpu_image.height = 1024;
det = calloc(1, sizeof(struct detector));
det->n_panels = 2;
det->panels = calloc(2, sizeof(struct panel));
det->panels[0].min_fs = 0;
det->panels[0].max_fs = 1023;
det->panels[0].min_ss = 0;
det->panels[0].max_ss = 511;
det->panels[0].fsx = 1;
det->panels[0].fsy = 0;
det->panels[0].ssx = 0;
det->panels[0].ssy = 1;
det->panels[0].xfs = 1;
det->panels[0].yfs = 0;
det->panels[0].xss = 0;
det->panels[0].yss = 1;
det->panels[0].cnx = -512.0;
det->panels[0].cny = -512.0-sep;
det->panels[0].clen = 100.0e-3;
det->panels[0].res = 9090.91;
det->panels[1].min_fs = 0;
det->panels[1].max_fs = 1023;
det->panels[1].min_ss = 512;
det->panels[1].max_ss = 1023;
det->panels[1].fsx = 1;
det->panels[1].fsy = 0;
det->panels[1].ssx = 0;
det->panels[1].ssy = 1;
det->panels[1].xfs = 1;
det->panels[1].yfs = 0;
det->panels[1].xss = 0;
det->panels[1].yss = 1;
det->panels[1].cnx = -512.0;
det->panels[1].cny = sep;
det->panels[1].clen = 100.0e-3;
det->panels[1].res = 9090.91;
cpu_image.det = det;
gpu_image.det = det;
beam = calloc(1, sizeof(struct beam_params));
beam->fluence = 1.0e15; /* Does nothing */
beam->beam_radius = 1.0e-6;
beam->photon_energy = 9000.0;
beam->bandwidth = 0.1 / 100.0;
beam->divergence = 0.0;
beam->dqe = 1.0;
beam->adu_per_photon = 1.0;
cpu_image.beam = beam;
gpu_image.beam = beam;
cpu_image.lambda = ph_en_to_lambda(eV_to_J(beam->photon_energy));
gpu_image.lambda = ph_en_to_lambda(eV_to_J(beam->photon_energy));
start = get_hires_seconds();
get_diffraction_gpu(gctx, &gpu_image, 8, 8, 8, cell);
end = get_hires_seconds();
gpu_time = end - start;
start = get_hires_seconds();
get_diffraction(&cpu_image, 8, 8, 8, NULL, NULL, NULL, cell,
GRADIENT_MOSAIC, "1");
end = get_hires_seconds();
cpu_time = end - start;
STATUS("The GPU version was %5.2f times faster.\n", cpu_time/gpu_time);
gpu_min = +INFINITY; gpu_max = -INFINITY; gpu_tot = 0.0;
cpu_min = +INFINITY; cpu_max = -INFINITY; cpu_tot = 0.0;
dev = 0.0;
for ( i=0; i<1024*1024; i++ ) {
const double cpu = cpu_image.data[i];
const double gpu = gpu_image.data[i];
if ( cpu > cpu_max ) cpu_max = cpu;
if ( cpu < cpu_min ) cpu_min = cpu;
if ( gpu > gpu_max ) gpu_max = gpu;
if ( gpu < gpu_min ) gpu_min = gpu;
gpu_tot += gpu;
cpu_tot += cpu;
dev += fabs(gpu - cpu);
}
perc = 100.0*dev/cpu_tot;
STATUS("GPU: min=%8e, max=%8e, total=%8e\n", gpu_min, gpu_max, gpu_tot);
STATUS("CPU: min=%8e, max=%8e, total=%8e\n", cpu_min, cpu_max, cpu_tot);
STATUS("dev = %8e (%5.2f%% of CPU total)\n", dev, perc);
cell_free(cell);
free_detector_geometry(det);
free(beam);
if ( perc > 1.0 ) {
STATUS("Test failed! I'm writing cpu-sim.h5 and gpu-sim.h5"
" for you to inspect.\n");
hdf5_write("cpu-sim.h5", cpu_image.data, cpu_image.width,
cpu_image.height, H5T_NATIVE_FLOAT);
hdf5_write("gpu-sim.h5", gpu_image.data, gpu_image.width,
gpu_image.height, H5T_NATIVE_FLOAT);
return 1;
}
return 0;
}
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