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stats: Add igt_stats_get_range()

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Somewhat useful, for instance to size an histogram.

Signed-off-by: Damien Lespiau <damien.lespiau@intel.com>
This commit is contained in:
Damien Lespiau 2015-06-27 11:12:01 +01:00
parent 4a89a841a1
commit 0e4c175e04
3 changed files with 28 additions and 0 deletions
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16
lib/igt_stats.c
View File

@ -187,6 +187,22 @@ uint64_t igt_stats_get_max(igt_stats_t *stats)
return stats->max;
}
/**
* igt_stats_get_range:
* @stats: An #igt_stats_t instance
*
* Retrieves the range of the values in @stats. The range is the difference
* between the highest and the lowest value.
*
* The range can be a deceiving characterization of the values, because there
* can be extreme minimal and maximum values that are just anomalies. Prefer
* the interquatile range or an histogram.
*/
uint64_t igt_stats_get_range(igt_stats_t *stats)
{
return igt_stats_get_max(stats) - igt_stats_get_min(stats);
}
/*
* Algorithm popularised by Knuth in:
*

1
lib/igt_stats.h
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@ -52,6 +52,7 @@ 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);
uint64_t igt_stats_get_range(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);

11
lib/tests/igt_stats.c
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@ -68,6 +68,16 @@ static void test_min_max(void)
igt_assert(igt_stats_get_max(&stats) == 10);
}
static void test_range(void)
{
igt_stats_t stats;
igt_stats_init(&stats, 5);
push_fixture_1(&stats);
igt_assert(igt_stats_get_range(&stats) == 8);
}
static void test_mean(void)
{
igt_stats_t stats;
@ -139,6 +149,7 @@ igt_simple_main
test_init_zero();
test_init();
test_min_max();
test_range();
test_mean();
test_invalidate_mean();
test_std_deviation();