current/deps/histogram/src/hdr_histogram.c
/**
* hdr_histogram.c
* Written by Michael Barker and released to the public domain,
* as explained at http://creativecommons.org/publicdomain/zero/1.0/
*/
#include <stdlib.h>
#include <stdbool.h>
#include <math.h>
#include <assert.h>
#include <stdio.h>
#include <string.h>
#include <stdint.h>
#include <errno.h>
#include <inttypes.h>
#include "hdr_histogram.h"
#include "hdr_tests.h"
/* ###### ####### ## ## ## ## ######## ###### */
/* ## ## ## ## ## ## ### ## ## ## ## */
/* ## ## ## ## ## #### ## ## ## */
/* ## ## ## ## ## ## ## ## ## ###### */
/* ## ## ## ## ## ## #### ## ## */
/* ## ## ## ## ## ## ## ### ## ## ## */
/* ###### ####### ####### ## ## ## ###### */
static int32_t normalize_index(const struct hdr_histogram* h, int32_t index)
{
int32_t normalized_index;
int32_t adjustment = 0;
if (h->normalizing_index_offset == 0)
{
return index;
}
normalized_index = index - h->normalizing_index_offset;
if (normalized_index < 0)
{
adjustment = h->counts_len;
}
else if (normalized_index >= h->counts_len)
{
adjustment = -h->counts_len;
}
return normalized_index + adjustment;
}
static int64_t counts_get_direct(const struct hdr_histogram* h, int32_t index)
{
return h->counts[index];
}
static int64_t counts_get_normalised(const struct hdr_histogram* h, int32_t index)
{
return counts_get_direct(h, normalize_index(h, index));
}
static void counts_inc_normalised(
struct hdr_histogram* h, int32_t index, int64_t value)
{
int32_t normalised_index = normalize_index(h, index);
h->counts[normalised_index] += value;
h->total_count += value;
}
static void update_min_max(struct hdr_histogram* h, int64_t value)
{
h->min_value = (value < h->min_value && value != 0) ? value : h->min_value;
h->max_value = (value > h->max_value) ? value : h->max_value;
}
/* ## ## ######## #### ## #### ######## ## ## */
/* ## ## ## ## ## ## ## ## ## */
/* ## ## ## ## ## ## ## #### */
/* ## ## ## ## ## ## ## ## */
/* ## ## ## ## ## ## ## ## */
/* ## ## ## ## ## ## ## ## */
/* ####### ## #### ######## #### ## ## */
static int64_t power(int64_t base, int64_t exp)
{
int64_t result = 1;
while(exp)
{
result *= base; exp--;
}
return result;
}
#if defined(_MSC_VER)
# if defined(_WIN64)
# pragma intrinsic(_BitScanReverse64)
# else
# pragma intrinsic(_BitScanReverse)
# endif
#endif
static int32_t get_bucket_index(const struct hdr_histogram* h, int64_t value)
{
#if defined(_MSC_VER)
uint32_t leading_zero = 0;
int64_t masked_value = value | h->sub_bucket_mask;
# if defined(_WIN64)
_BitScanReverse64(&leading_zero, masked_value);
# else
uint32_t high = masked_value >> 32;
if (_BitScanReverse(&leading_zero, high)) {
leading_zero += 32;
} else {
uint32_t low = masked_value & 0x00000000FFFFFFFF;
_BitScanReverse(&leading_zero, low);
}
# endif
int32_t pow2ceiling = 64 - (63 - leading_zero); /* smallest power of 2 containing value */
#else
int32_t pow2ceiling = 64 - __builtin_clzll(value | h->sub_bucket_mask); /* smallest power of 2 containing value */
#endif
return pow2ceiling - h->unit_magnitude - (h->sub_bucket_half_count_magnitude + 1);
}
static int32_t get_sub_bucket_index(int64_t value, int32_t bucket_index, int32_t unit_magnitude)
{
return (int32_t)(value >> (bucket_index + unit_magnitude));
}
static int32_t counts_index(const struct hdr_histogram* h, int32_t bucket_index, int32_t sub_bucket_index)
{
/* Calculate the index for the first entry in the bucket: */
/* (The following is the equivalent of ((bucket_index + 1) * subBucketHalfCount) ): */
int32_t bucket_base_index = (bucket_index + 1) << h->sub_bucket_half_count_magnitude;
/* Calculate the offset in the bucket: */
int32_t offset_in_bucket = sub_bucket_index - h->sub_bucket_half_count;
/* The following is the equivalent of ((sub_bucket_index - subBucketHalfCount) + bucketBaseIndex; */
return bucket_base_index + offset_in_bucket;
}
static int64_t value_from_index(int32_t bucket_index, int32_t sub_bucket_index, int32_t unit_magnitude)
{
return ((int64_t) sub_bucket_index) << (bucket_index + unit_magnitude);
}
int32_t counts_index_for(const struct hdr_histogram* h, int64_t value)
{
int32_t bucket_index = get_bucket_index(h, value);
int32_t sub_bucket_index = get_sub_bucket_index(value, bucket_index, h->unit_magnitude);
return counts_index(h, bucket_index, sub_bucket_index);
}
int64_t hdr_value_at_index(const struct hdr_histogram *h, int32_t index)
{
int32_t bucket_index = (index >> h->sub_bucket_half_count_magnitude) - 1;
int32_t sub_bucket_index = (index & (h->sub_bucket_half_count - 1)) + h->sub_bucket_half_count;
if (bucket_index < 0)
{
sub_bucket_index -= h->sub_bucket_half_count;
bucket_index = 0;
}
return value_from_index(bucket_index, sub_bucket_index, h->unit_magnitude);
}
int64_t hdr_size_of_equivalent_value_range(const struct hdr_histogram* h, int64_t value)
{
int32_t bucket_index = get_bucket_index(h, value);
int32_t sub_bucket_index = get_sub_bucket_index(value, bucket_index, h->unit_magnitude);
int32_t adjusted_bucket = (sub_bucket_index >= h->sub_bucket_count) ? (bucket_index + 1) : bucket_index;
return INT64_C(1) << (h->unit_magnitude + adjusted_bucket);
}
static int64_t lowest_equivalent_value(const struct hdr_histogram* h, int64_t value)
{
int32_t bucket_index = get_bucket_index(h, value);
int32_t sub_bucket_index = get_sub_bucket_index(value, bucket_index, h->unit_magnitude);
return value_from_index(bucket_index, sub_bucket_index, h->unit_magnitude);
}
int64_t hdr_next_non_equivalent_value(const struct hdr_histogram *h, int64_t value)
{
return lowest_equivalent_value(h, value) + hdr_size_of_equivalent_value_range(h, value);
}
static int64_t highest_equivalent_value(const struct hdr_histogram* h, int64_t value)
{
return hdr_next_non_equivalent_value(h, value) - 1;
}
int64_t hdr_median_equivalent_value(const struct hdr_histogram *h, int64_t value)
{
return lowest_equivalent_value(h, value) + (hdr_size_of_equivalent_value_range(h, value) >> 1);
}
static int64_t non_zero_min(const struct hdr_histogram* h)
{
if (INT64_MAX == h->min_value)
{
return INT64_MAX;
}
return lowest_equivalent_value(h, h->min_value);
}
void hdr_reset_internal_counters(struct hdr_histogram* h)
{
int min_non_zero_index = -1;
int max_index = -1;
int64_t observed_total_count = 0;
int i;
for (i = 0; i < h->counts_len; i++)
{
int64_t count_at_index;
if ((count_at_index = counts_get_direct(h, i)) > 0)
{
observed_total_count += count_at_index;
max_index = i;
if (min_non_zero_index == -1 && i != 0)
{
min_non_zero_index = i;
}
}
}
if (max_index == -1)
{
h->max_value = 0;
}
else
{
int64_t max_value = hdr_value_at_index(h, max_index);
h->max_value = highest_equivalent_value(h, max_value);
}
if (min_non_zero_index == -1)
{
h->min_value = INT64_MAX;
}
else
{
h->min_value = hdr_value_at_index(h, min_non_zero_index);
}
h->total_count = observed_total_count;
}
static int32_t buckets_needed_to_cover_value(int64_t value, int32_t sub_bucket_count, int32_t unit_magnitude)
{
int64_t smallest_untrackable_value = ((int64_t) sub_bucket_count) << unit_magnitude;
int32_t buckets_needed = 1;
while (smallest_untrackable_value <= value)
{
if (smallest_untrackable_value > INT64_MAX / 2)
{
return buckets_needed + 1;
}
smallest_untrackable_value <<= 1;
buckets_needed++;
}
return buckets_needed;
}
/* ## ## ######## ## ## ####### ######## ## ## */
/* ### ### ## ### ### ## ## ## ## ## ## */
/* #### #### ## #### #### ## ## ## ## #### */
/* ## ### ## ###### ## ### ## ## ## ######## ## */
/* ## ## ## ## ## ## ## ## ## ## */
/* ## ## ## ## ## ## ## ## ## ## */
/* ## ## ######## ## ## ####### ## ## ## */
int hdr_calculate_bucket_config(
int64_t lowest_trackable_value,
int64_t highest_trackable_value,
int significant_figures,
struct hdr_histogram_bucket_config* cfg)
{
int32_t sub_bucket_count_magnitude;
int64_t largest_value_with_single_unit_resolution;
if (lowest_trackable_value < 1 ||
significant_figures < 1 || 5 < significant_figures)
{
return EINVAL;
}
else if (lowest_trackable_value * 2 > highest_trackable_value)
{
return EINVAL;
}
cfg->lowest_trackable_value = lowest_trackable_value;
cfg->significant_figures = significant_figures;
cfg->highest_trackable_value = highest_trackable_value;
largest_value_with_single_unit_resolution = 2 * power(10, significant_figures);
sub_bucket_count_magnitude = (int32_t) ceil(log((double)largest_value_with_single_unit_resolution) / log(2));
cfg->sub_bucket_half_count_magnitude = ((sub_bucket_count_magnitude > 1) ? sub_bucket_count_magnitude : 1) - 1;
cfg->unit_magnitude = (int32_t) floor(log((double)lowest_trackable_value) / log(2));
cfg->sub_bucket_count = (int32_t) pow(2, (cfg->sub_bucket_half_count_magnitude + 1));
cfg->sub_bucket_half_count = cfg->sub_bucket_count / 2;
cfg->sub_bucket_mask = ((int64_t) cfg->sub_bucket_count - 1) << cfg->unit_magnitude;
if (cfg->unit_magnitude + cfg->sub_bucket_half_count_magnitude > 61)
{
return EINVAL;
}
cfg->bucket_count = buckets_needed_to_cover_value(highest_trackable_value, cfg->sub_bucket_count, (int32_t)cfg->unit_magnitude);
cfg->counts_len = (cfg->bucket_count + 1) * (cfg->sub_bucket_count / 2);
return 0;
}
void hdr_init_preallocated(struct hdr_histogram* h, struct hdr_histogram_bucket_config* cfg)
{
h->lowest_trackable_value = cfg->lowest_trackable_value;
h->highest_trackable_value = cfg->highest_trackable_value;
h->unit_magnitude = (int32_t)cfg->unit_magnitude;
h->significant_figures = (int32_t)cfg->significant_figures;
h->sub_bucket_half_count_magnitude = cfg->sub_bucket_half_count_magnitude;
h->sub_bucket_half_count = cfg->sub_bucket_half_count;
h->sub_bucket_mask = cfg->sub_bucket_mask;
h->sub_bucket_count = cfg->sub_bucket_count;
h->min_value = INT64_MAX;
h->max_value = 0;
h->normalizing_index_offset = 0;
h->conversion_ratio = 1.0;
h->bucket_count = cfg->bucket_count;
h->counts_len = cfg->counts_len;
h->total_count = 0;
}
int hdr_init(
int64_t lowest_trackable_value,
int64_t highest_trackable_value,
int significant_figures,
struct hdr_histogram** result)
{
int64_t* counts;
struct hdr_histogram_bucket_config cfg;
struct hdr_histogram* histogram;
int r = hdr_calculate_bucket_config(lowest_trackable_value, highest_trackable_value, significant_figures, &cfg);
if (r)
{
return r;
}
counts = calloc((size_t) cfg.counts_len, sizeof(int64_t));
histogram = calloc(1, sizeof(struct hdr_histogram));
if (!counts || !histogram)
{
return ENOMEM;
}
histogram->counts = counts;
hdr_init_preallocated(histogram, &cfg);
*result = histogram;
return 0;
}
void hdr_close(struct hdr_histogram* h)
{
free(h->counts);
free(h);
}
int hdr_alloc(int64_t highest_trackable_value, int significant_figures, struct hdr_histogram** result)
{
return hdr_init(1, highest_trackable_value, significant_figures, result);
}
/* reset a histogram to zero. */
void hdr_reset(struct hdr_histogram *h)
{
h->total_count=0;
h->min_value = INT64_MAX;
h->max_value = 0;
memset(h->counts, 0, (sizeof(int64_t) * h->counts_len));
}
size_t hdr_get_memory_size(struct hdr_histogram *h)
{
return sizeof(struct hdr_histogram) + h->counts_len * sizeof(int64_t);
}
/* ## ## ######## ######## ### ######## ######## ###### */
/* ## ## ## ## ## ## ## ## ## ## ## ## */
/* ## ## ## ## ## ## ## ## ## ## ## */
/* ## ## ######## ## ## ## ## ## ###### ###### */
/* ## ## ## ## ## ######### ## ## ## */
/* ## ## ## ## ## ## ## ## ## ## ## */
/* ####### ## ######## ## ## ## ######## ###### */
bool hdr_record_value(struct hdr_histogram* h, int64_t value)
{
return hdr_record_values(h, value, 1);
}
bool hdr_record_values(struct hdr_histogram* h, int64_t value, int64_t count)
{
int32_t counts_index;
if (value < 0)
{
return false;
}
counts_index = counts_index_for(h, value);
if (counts_index < 0 || h->counts_len <= counts_index)
{
return false;
}
counts_inc_normalised(h, counts_index, count);
update_min_max(h, value);
return true;
}
bool hdr_record_corrected_value(struct hdr_histogram* h, int64_t value, int64_t expected_interval)
{
return hdr_record_corrected_values(h, value, 1, expected_interval);
}
bool hdr_record_corrected_values(struct hdr_histogram* h, int64_t value, int64_t count, int64_t expected_interval)
{
int64_t missing_value;
if (!hdr_record_values(h, value, count))
{
return false;
}
if (expected_interval <= 0 || value <= expected_interval)
{
return true;
}
missing_value = value - expected_interval;
for (; missing_value >= expected_interval; missing_value -= expected_interval)
{
if (!hdr_record_values(h, missing_value, count))
{
return false;
}
}
return true;
}
int64_t hdr_add(struct hdr_histogram* h, const struct hdr_histogram* from)
{
struct hdr_iter iter;
int64_t dropped = 0;
hdr_iter_recorded_init(&iter, from);
while (hdr_iter_next(&iter))
{
int64_t value = iter.value;
int64_t count = iter.count;
if (!hdr_record_values(h, value, count))
{
dropped += count;
}
}
return dropped;
}
int64_t hdr_add_while_correcting_for_coordinated_omission(
struct hdr_histogram* h, struct hdr_histogram* from, int64_t expected_interval)
{
struct hdr_iter iter;
int64_t dropped = 0;
hdr_iter_recorded_init(&iter, from);
while (hdr_iter_next(&iter))
{
int64_t value = iter.value;
int64_t count = iter.count;
if (!hdr_record_corrected_values(h, value, count, expected_interval))
{
dropped += count;
}
}
return dropped;
}
/* ## ## ### ## ## ## ######## ###### */
/* ## ## ## ## ## ## ## ## ## ## */
/* ## ## ## ## ## ## ## ## ## */
/* ## ## ## ## ## ## ## ###### ###### */
/* ## ## ######### ## ## ## ## ## */
/* ## ## ## ## ## ## ## ## ## ## */
/* ### ## ## ######## ####### ######## ###### */
int64_t hdr_max(const struct hdr_histogram* h)
{
if (0 == h->max_value)
{
return 0;
}
return highest_equivalent_value(h, h->max_value);
}
int64_t hdr_min(const struct hdr_histogram* h)
{
if (0 < hdr_count_at_index(h, 0))
{
return 0;
}
return non_zero_min(h);
}
int64_t hdr_value_at_percentile(const struct hdr_histogram* h, double percentile)
{
struct hdr_iter iter;
int64_t total = 0;
double requested_percentile = percentile < 100.0 ? percentile : 100.0;
int64_t count_at_percentile =
(int64_t) (((requested_percentile / 100) * h->total_count) + 0.5);
count_at_percentile = count_at_percentile > 1 ? count_at_percentile : 1;
hdr_iter_init(&iter, h);
while (hdr_iter_next(&iter))
{
total += iter.count;
if (total >= count_at_percentile)
{
int64_t value_from_index = iter.value;
return highest_equivalent_value(h, value_from_index);
}
}
return 0;
}
double hdr_mean(const struct hdr_histogram* h)
{
struct hdr_iter iter;
int64_t total = 0;
hdr_iter_init(&iter, h);
while (hdr_iter_next(&iter))
{
if (0 != iter.count)
{
total += iter.count * hdr_median_equivalent_value(h, iter.value);
}
}
return (total * 1.0) / h->total_count;
}
double hdr_stddev(const struct hdr_histogram* h)
{
double mean = hdr_mean(h);
double geometric_dev_total = 0.0;
struct hdr_iter iter;
hdr_iter_init(&iter, h);
while (hdr_iter_next(&iter))
{
if (0 != iter.count)
{
double dev = (hdr_median_equivalent_value(h, iter.value) * 1.0) - mean;
geometric_dev_total += (dev * dev) * iter.count;
}
}
return sqrt(geometric_dev_total / h->total_count);
}
bool hdr_values_are_equivalent(const struct hdr_histogram* h, int64_t a, int64_t b)
{
return lowest_equivalent_value(h, a) == lowest_equivalent_value(h, b);
}
int64_t hdr_lowest_equivalent_value(const struct hdr_histogram* h, int64_t value)
{
return lowest_equivalent_value(h, value);
}
int64_t hdr_count_at_value(const struct hdr_histogram* h, int64_t value)
{
return counts_get_normalised(h, counts_index_for(h, value));
}
int64_t hdr_count_at_index(const struct hdr_histogram* h, int32_t index)
{
return counts_get_normalised(h, index);
}
/* #### ######## ######## ######## ### ######## ####### ######## ###### */
/* ## ## ## ## ## ## ## ## ## ## ## ## ## ## */
/* ## ## ## ## ## ## ## ## ## ## ## ## ## */
/* ## ## ###### ######## ## ## ## ## ## ######## ###### */
/* ## ## ## ## ## ######### ## ## ## ## ## ## */
/* ## ## ## ## ## ## ## ## ## ## ## ## ## ## */
/* #### ## ######## ## ## ## ## ## ####### ## ## ###### */
static bool has_buckets(struct hdr_iter* iter)
{
return iter->counts_index < iter->h->counts_len;
}
static bool has_next(struct hdr_iter* iter)
{
return iter->cumulative_count < iter->total_count;
}
static bool move_next(struct hdr_iter* iter)
{
iter->counts_index++;
if (!has_buckets(iter))
{
return false;
}
iter->count = counts_get_normalised(iter->h, iter->counts_index);
iter->cumulative_count += iter->count;
iter->value = hdr_value_at_index(iter->h, iter->counts_index);
iter->highest_equivalent_value = highest_equivalent_value(iter->h, iter->value);
iter->lowest_equivalent_value = lowest_equivalent_value(iter->h, iter->value);
iter->median_equivalent_value = hdr_median_equivalent_value(iter->h, iter->value);
return true;
}
static int64_t peek_next_value_from_index(struct hdr_iter* iter)
{
return hdr_value_at_index(iter->h, iter->counts_index + 1);
}
static bool next_value_greater_than_reporting_level_upper_bound(
struct hdr_iter *iter, int64_t reporting_level_upper_bound)
{
if (iter->counts_index >= iter->h->counts_len)
{
return false;
}
return peek_next_value_from_index(iter) > reporting_level_upper_bound;
}
static bool _basic_iter_next(struct hdr_iter *iter)
{
if (!has_next(iter) || iter->counts_index >= iter->h->counts_len)
{
return false;
}
move_next(iter);
return true;
}
static void _update_iterated_values(struct hdr_iter* iter, int64_t new_value_iterated_to)
{
iter->value_iterated_from = iter->value_iterated_to;
iter->value_iterated_to = new_value_iterated_to;
}
static bool _all_values_iter_next(struct hdr_iter* iter)
{
bool result = move_next(iter);
if (result)
{
_update_iterated_values(iter, iter->value);
}
return result;
}
void hdr_iter_init(struct hdr_iter* iter, const struct hdr_histogram* h)
{
iter->h = h;
iter->counts_index = -1;
iter->total_count = h->total_count;
iter->count = 0;
iter->cumulative_count = 0;
iter->value = 0;
iter->highest_equivalent_value = 0;
iter->value_iterated_from = 0;
iter->value_iterated_to = 0;
iter->_next_fp = _all_values_iter_next;
}
bool hdr_iter_next(struct hdr_iter* iter)
{
return iter->_next_fp(iter);
}
/* ######## ######## ######## ###### ######## ## ## ######## #### ## ######## ###### */
/* ## ## ## ## ## ## ## ## ### ## ## ## ## ## ## ## */
/* ## ## ## ## ## ## ## #### ## ## ## ## ## ## */
/* ######## ###### ######## ## ###### ## ## ## ## ## ## ###### ###### */
/* ## ## ## ## ## ## ## #### ## ## ## ## ## */
/* ## ## ## ## ## ## ## ## ### ## ## ## ## ## ## */
/* ## ######## ## ## ###### ######## ## ## ## #### ######## ######## ###### */
static bool _percentile_iter_next(struct hdr_iter* iter)
{
int64_t temp, half_distance, percentile_reporting_ticks;
struct hdr_iter_percentiles* percentiles = &iter->specifics.percentiles;
if (!has_next(iter))
{
if (percentiles->seen_last_value)
{
return false;
}
percentiles->seen_last_value = true;
percentiles->percentile = 100.0;
return true;
}
if (iter->counts_index == -1 && !_basic_iter_next(iter))
{
return false;
}
do
{
double current_percentile = (100.0 * (double) iter->cumulative_count) / iter->h->total_count;
if (iter->count != 0 &&
percentiles->percentile_to_iterate_to <= current_percentile)
{
_update_iterated_values(iter, highest_equivalent_value(iter->h, iter->value));
percentiles->percentile = percentiles->percentile_to_iterate_to;
temp = (int64_t)(log(100 / (100.0 - (percentiles->percentile_to_iterate_to))) / log(2)) + 1;
half_distance = (int64_t) pow(2, (double) temp);
percentile_reporting_ticks = percentiles->ticks_per_half_distance * half_distance;
percentiles->percentile_to_iterate_to += 100.0 / percentile_reporting_ticks;
return true;
}
}
while (_basic_iter_next(iter));
return true;
}
void hdr_iter_percentile_init(struct hdr_iter* iter, const struct hdr_histogram* h, int32_t ticks_per_half_distance)
{
iter->h = h;
hdr_iter_init(iter, h);
iter->specifics.percentiles.seen_last_value = false;
iter->specifics.percentiles.ticks_per_half_distance = ticks_per_half_distance;
iter->specifics.percentiles.percentile_to_iterate_to = 0.0;
iter->specifics.percentiles.percentile = 0.0;
iter->_next_fp = _percentile_iter_next;
}
static void format_line_string(char* str, size_t len, int significant_figures, format_type format)
{
#if defined(_MSC_VER)
#define snprintf _snprintf
#pragma warning(push)
#pragma warning(disable: 4996)
#endif
const char* format_str = "%s%d%s";
switch (format)
{
case CSV:
snprintf(str, len, format_str, "%.", significant_figures, "f,%f,%d,%.2f\n");
break;
case CLASSIC:
snprintf(str, len, format_str, "%12.", significant_figures, "f %12f %12d %12.2f\n");
break;
default:
snprintf(str, len, format_str, "%12.", significant_figures, "f %12f %12d %12.2f\n");
}
#if defined(_MSC_VER)
#undef snprintf
#pragma warning(pop)
#endif
}
/* ######## ######## ###### ####### ######## ######## ######## ######## */
/* ## ## ## ## ## ## ## ## ## ## ## ## ## ## */
/* ## ## ## ## ## ## ## ## ## ## ## ## ## */
/* ######## ###### ## ## ## ######## ## ## ###### ## ## */
/* ## ## ## ## ## ## ## ## ## ## ## ## ## */
/* ## ## ## ## ## ## ## ## ## ## ## ## ## ## */
/* ## ## ######## ###### ####### ## ## ######## ######## ######## */
static bool _recorded_iter_next(struct hdr_iter* iter)
{
while (_basic_iter_next(iter))
{
if (iter->count != 0)
{
_update_iterated_values(iter, iter->value);
iter->specifics.recorded.count_added_in_this_iteration_step = iter->count;
return true;
}
}
return false;
}
void hdr_iter_recorded_init(struct hdr_iter* iter, const struct hdr_histogram* h)
{
hdr_iter_init(iter, h);
iter->specifics.recorded.count_added_in_this_iteration_step = 0;
iter->_next_fp = _recorded_iter_next;
}
/* ## #### ## ## ######## ### ######## */
/* ## ## ### ## ## ## ## ## ## */
/* ## ## #### ## ## ## ## ## ## */
/* ## ## ## ## ## ###### ## ## ######## */
/* ## ## ## #### ## ######### ## ## */
/* ## ## ## ### ## ## ## ## ## */
/* ######## #### ## ## ######## ## ## ## ## */
static bool _iter_linear_next(struct hdr_iter* iter)
{
struct hdr_iter_linear* linear = &iter->specifics.linear;
linear->count_added_in_this_iteration_step = 0;
if (has_next(iter) ||
next_value_greater_than_reporting_level_upper_bound(
iter, linear->next_value_reporting_level_lowest_equivalent))
{
do
{
if (iter->value >= linear->next_value_reporting_level_lowest_equivalent)
{
_update_iterated_values(iter, linear->next_value_reporting_level);
linear->next_value_reporting_level += linear->value_units_per_bucket;
linear->next_value_reporting_level_lowest_equivalent =
lowest_equivalent_value(iter->h, linear->next_value_reporting_level);
return true;
}
if (!move_next(iter))
{
return true;
}
linear->count_added_in_this_iteration_step += iter->count;
}
while (true);
}
return false;
}
void hdr_iter_linear_init(struct hdr_iter* iter, const struct hdr_histogram* h, int64_t value_units_per_bucket)
{
hdr_iter_init(iter, h);
iter->specifics.linear.count_added_in_this_iteration_step = 0;
iter->specifics.linear.value_units_per_bucket = value_units_per_bucket;
iter->specifics.linear.next_value_reporting_level = value_units_per_bucket;
iter->specifics.linear.next_value_reporting_level_lowest_equivalent = lowest_equivalent_value(h, value_units_per_bucket);
iter->_next_fp = _iter_linear_next;
}
/* ## ####### ###### ### ######## #### ######## ## ## ## ## #### ###### */
/* ## ## ## ## ## ## ## ## ## ## ## ## ## ### ### ## ## ## */
/* ## ## ## ## ## ## ## ## ## ## ## ## #### #### ## ## */
/* ## ## ## ## #### ## ## ######## ## ## ######### ## ### ## ## ## */
/* ## ## ## ## ## ######### ## ## ## ## ## ## ## ## ## ## */
/* ## ## ## ## ## ## ## ## ## ## ## ## ## ## ## ## ## ## */
/* ######## ####### ###### ## ## ## ## #### ## ## ## ## ## #### ###### */
static bool _log_iter_next(struct hdr_iter *iter)
{
struct hdr_iter_log* logarithmic = &iter->specifics.log;
logarithmic->count_added_in_this_iteration_step = 0;
if (has_next(iter) ||
next_value_greater_than_reporting_level_upper_bound(
iter, logarithmic->next_value_reporting_level_lowest_equivalent))
{
do
{
if (iter->value >= logarithmic->next_value_reporting_level_lowest_equivalent)
{
_update_iterated_values(iter, logarithmic->next_value_reporting_level);
logarithmic->next_value_reporting_level *= (int64_t)logarithmic->log_base;
logarithmic->next_value_reporting_level_lowest_equivalent = lowest_equivalent_value(iter->h, logarithmic->next_value_reporting_level);
return true;
}
if (!move_next(iter))
{
return true;
}
logarithmic->count_added_in_this_iteration_step += iter->count;
}
while (true);
}
return false;
}
void hdr_iter_log_init(
struct hdr_iter* iter,
const struct hdr_histogram* h,
int64_t value_units_first_bucket,
double log_base)
{
hdr_iter_init(iter, h);
iter->specifics.log.count_added_in_this_iteration_step = 0;
iter->specifics.log.log_base = log_base;
iter->specifics.log.next_value_reporting_level = value_units_first_bucket;
iter->specifics.log.next_value_reporting_level_lowest_equivalent = lowest_equivalent_value(h, value_units_first_bucket);
iter->_next_fp = _log_iter_next;
}
/* Printing. */
static const char* format_head_string(format_type format)
{
switch (format)
{
case CSV:
return "%s,%s,%s,%s\n";
case CLASSIC:
return "%12s %12s %12s %12s\n\n";
default:
return "%12s %12s %12s %12s\n\n";
}
}
static const char CLASSIC_FOOTER[] =
"#[Mean = %12.3f, StdDeviation = %12.3f]\n"
"#[Max = %12.3f, Total count = %12" PRIu64 "]\n"
"#[Buckets = %12d, SubBuckets = %12d]\n";
int hdr_percentiles_print(
struct hdr_histogram* h, FILE* stream, int32_t ticks_per_half_distance,
double value_scale, format_type format)
{
char line_format[25];
const char* head_format;
int rc = 0;
struct hdr_iter iter;
struct hdr_iter_percentiles * percentiles;
format_line_string(line_format, 25, h->significant_figures, format);
head_format = format_head_string(format);
hdr_iter_percentile_init(&iter, h, ticks_per_half_distance);
if (fprintf(
stream, head_format,
"Value", "Percentile", "TotalCount", "1/(1-Percentile)") < 0)
{
rc = EIO;
goto cleanup;
}
percentiles = &iter.specifics.percentiles;
while (hdr_iter_next(&iter))
{
double value = iter.highest_equivalent_value / value_scale;
double percentile = percentiles->percentile / 100.0;
int64_t total_count = iter.cumulative_count;
double inverted_percentile = (1.0 / (1.0 - percentile));
if (fprintf(
stream, line_format, value, percentile, total_count, inverted_percentile) < 0)
{
rc = EIO;
goto cleanup;
}
}
if (CLASSIC == format)
{
double mean = hdr_mean(h) / value_scale;
double stddev = hdr_stddev(h) / value_scale;
double max = hdr_max(h) / value_scale;
if (fprintf(
stream, CLASSIC_FOOTER, mean, stddev, max,
h->total_count, h->bucket_count, h->sub_bucket_count) < 0)
{
rc = EIO;
goto cleanup;
}
}
cleanup:
return rc;
}