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authorThomas White <taw@physics.org>2011-05-25 17:51:18 +0200
committerThomas White <taw@physics.org>2012-02-22 15:27:27 +0100
commit69d3c604a3cc5ac9c6cba2ce1710761a7d8c0aae (patch)
tree99fce6b7a6449b839c6243c8146f48042459350d /tests
parent42438f091125bbb0025ab27b97f7caedfd66447c (diff)
Report how much faster the GPU version was
Diffstat (limited to 'tests')
-rw-r--r--tests/gpu_sim_check.c35
1 files changed, 35 insertions, 0 deletions
diff --git a/tests/gpu_sim_check.c b/tests/gpu_sim_check.c
index 3bcaa561..5b51ef62 100644
--- a/tests/gpu_sim_check.c
+++ b/tests/gpu_sim_check.c
@@ -25,6 +25,30 @@
#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;
@@ -39,6 +63,8 @@ int main(int argc, char *argv[])
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 ) {
@@ -110,9 +136,18 @@ int main(int argc, char *argv[])
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;