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Disregard first measurement for statistics.

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Themaister 2013-02-09 23:26:24 +01:00
parent 3cc95a3fdb
commit 0c460c524d
1 changed files with 15 additions and 13 deletions
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28
driver.c
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@ -449,23 +449,23 @@ void init_audio(void)
static void compute_audio_buffer_statistics(void) static void compute_audio_buffer_statistics(void)
{ {
unsigned samples = min(g_extern.measure_data.buffer_free_samples_count, AUDIO_BUFFER_FREE_SAMPLES_COUNT); unsigned samples = min(g_extern.measure_data.buffer_free_samples_count, AUDIO_BUFFER_FREE_SAMPLES_COUNT);
if (samples < 2) if (samples < 3)
return; return;
uint64_t accum = 0; uint64_t accum = 0;
for (unsigned i = 0; i < samples; i++) for (unsigned i = 1; i < samples; i++)
accum += g_extern.measure_data.buffer_free_samples[i]; accum += g_extern.measure_data.buffer_free_samples[i];
int avg = accum / samples; int avg = accum / (samples - 1);
uint64_t accum_var = 0; uint64_t accum_var = 0;
for (unsigned i = 0; i < samples; i++) for (unsigned i = 1; i < samples; i++)
{ {
int diff = avg - g_extern.measure_data.buffer_free_samples[i]; int diff = avg - g_extern.measure_data.buffer_free_samples[i];
accum_var += diff * diff; accum_var += diff * diff;
} }
unsigned stddev = (unsigned)sqrt((double)accum_var / (samples - 1)); unsigned stddev = (unsigned)sqrt((double)accum_var / (samples - 2));
float avg_filled = 1.0f - (float)avg / g_extern.audio_data.driver_buffer_size; float avg_filled = 1.0f - (float)avg / g_extern.audio_data.driver_buffer_size;
float deviation = (float)stddev / g_extern.audio_data.driver_buffer_size; float deviation = (float)stddev / g_extern.audio_data.driver_buffer_size;
@ -475,7 +475,7 @@ static void compute_audio_buffer_statistics(void)
unsigned low_water_count = 0; unsigned low_water_count = 0;
unsigned high_water_count = 0; unsigned high_water_count = 0;
for (unsigned i = 0; i < samples; i++) for (unsigned i = 1; i < samples; i++)
{ {
if (g_extern.measure_data.buffer_free_samples[i] >= low_water_size) if (g_extern.measure_data.buffer_free_samples[i] >= low_water_size)
low_water_count++; low_water_count++;
@ -486,8 +486,8 @@ static void compute_audio_buffer_statistics(void)
RARCH_LOG("Average audio buffer saturation: %.2f %%, standard deviation (percentage points): %.2f %%.\n", RARCH_LOG("Average audio buffer saturation: %.2f %%, standard deviation (percentage points): %.2f %%.\n",
avg_filled * 100.0, deviation * 100.0); avg_filled * 100.0, deviation * 100.0);
RARCH_LOG("Amount of time spent close to underrun: %.2f %%. Close to blocking: %.2f %%.\n", RARCH_LOG("Amount of time spent close to underrun: %.2f %%. Close to blocking: %.2f %%.\n",
(100.0 * low_water_count) / samples, (100.0 * low_water_count) / (samples - 1),
(100.0 * high_water_count) / samples); (100.0 * high_water_count) / (samples - 1));
} }
static void compute_monitor_fps_statistics(void) static void compute_monitor_fps_statistics(void)
@ -495,23 +495,25 @@ static void compute_monitor_fps_statistics(void)
unsigned samples = min(g_extern.measure_data.frame_time_samples_count, unsigned samples = min(g_extern.measure_data.frame_time_samples_count,
MEASURE_FRAME_TIME_SAMPLES_COUNT); MEASURE_FRAME_TIME_SAMPLES_COUNT);
if (samples < 2) if (samples < 3)
return; return;
// Measure statistics on frame time (microsecs), *not* FPS. // Measure statistics on frame time (microsecs), *not* FPS.
rarch_time_t accum = 0; rarch_time_t accum = 0;
for (unsigned i = 0; i < samples; i++) for (unsigned i = 1; i < samples; i++)
accum += g_extern.measure_data.frame_time_samples[i]; accum += g_extern.measure_data.frame_time_samples[i];
rarch_time_t avg = accum / samples; rarch_time_t avg = accum / (samples - 1);
rarch_time_t accum_var = 0; rarch_time_t accum_var = 0;
for (unsigned i = 0; i < samples; i++)
// Drop first measurement. It is likely to be bad.
for (unsigned i = 1; i < samples; i++)
{ {
rarch_time_t diff = avg - g_extern.measure_data.frame_time_samples[i]; rarch_time_t diff = avg - g_extern.measure_data.frame_time_samples[i];
accum_var += diff * diff; accum_var += diff * diff;
} }
double stddev = sqrt((double)accum_var / (samples - 1)); double stddev = sqrt((double)accum_var / (samples - 2));
double avg_fps = 1000000.0 / avg; double avg_fps = 1000000.0 / avg;
double max_stddev_fps = 1000000.0 / (avg - stddev); double max_stddev_fps = 1000000.0 / (avg - stddev);
double stddev_fps = max_stddev_fps - avg_fps; double stddev_fps = max_stddev_fps - avg_fps;