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stats: Add functions to retrieve min/max values of the dataset

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Signed-off-by: Damien Lespiau <damien.lespiau@intel.com>
This commit is contained in:
Damien Lespiau 2015-06-27 09:45:42 +01:00
parent 87009f3d7b
commit 4a89a841a1
3 changed files with 48 additions and 0 deletions
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33
lib/igt_stats.c
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@ -28,6 +28,8 @@
#include "igt_core.h"
#include "igt_stats.h"
#define U64_MAX ((uint64_t)~0ULL)
/**
* SECTION:igt_stats
* @short_description: Tools for statistical analysis
@ -78,6 +80,9 @@ void igt_stats_init(igt_stats_t *stats, unsigned int capacity)
stats->values = calloc(capacity, sizeof(*stats->values));
igt_assert(stats->values);
stats->capacity = capacity;
stats->min = U64_MAX;
stats->max = 0;
}
/**
@ -151,7 +156,35 @@ void igt_stats_push(igt_stats_t *stats, uint64_t value)
{
igt_assert(stats->n_values < stats->capacity);
stats->values[stats->n_values++] = value;
stats->mean_variance_valid = false;
if (value < stats->min)
stats->min = value;
if (value > stats->max)
stats->max = value;
}
/**
* igt_stats_get_min:
* @stats: An #igt_stats_t instance
*
* Retrieves the minimal value in @stats
*/
uint64_t igt_stats_get_min(igt_stats_t *stats)
{
return stats->min;
}
/**
* igt_stats_get_max:
* @stats: An #igt_stats_t instance
*
* Retrieves the maximum value in @stats
*/
uint64_t igt_stats_get_max(igt_stats_t *stats)
{
return stats->max;
}
/*

3
lib/igt_stats.h
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@ -41,6 +41,7 @@ typedef struct {
unsigned int capacity;
unsigned int is_population : 1;
unsigned int mean_variance_valid : 1;
uint64_t min, max;
double mean, variance;
} igt_stats_t;
@ -49,6 +50,8 @@ void igt_stats_fini(igt_stats_t *stats);
bool igt_stats_is_population(igt_stats_t *stats);
void igt_stats_set_population(igt_stats_t *stats, bool full_population);
void igt_stats_push(igt_stats_t *stats, uint64_t value);
uint64_t igt_stats_get_min(igt_stats_t *stats);
uint64_t igt_stats_get_max(igt_stats_t *stats);
double igt_stats_get_mean(igt_stats_t *stats);
double igt_stats_get_variance(igt_stats_t *stats);
double igt_stats_get_std_deviation(igt_stats_t *stats);

12
lib/tests/igt_stats.c
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@ -57,6 +57,17 @@ static void test_init(void)
igt_assert(igt_stats_is_population(&stats) == false);
}
static void test_min_max(void)
{
igt_stats_t stats;
igt_stats_init(&stats, 5);
push_fixture_1(&stats);
igt_assert(igt_stats_get_min(&stats) == 2);
igt_assert(igt_stats_get_max(&stats) == 10);
}
static void test_mean(void)
{
igt_stats_t stats;
@ -127,6 +138,7 @@ igt_simple_main
{
test_init_zero();
test_init();
test_min_max();
test_mean();
test_invalidate_mean();
test_std_deviation();