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// SPDX-License-Identifier: GPL-3.0-or-later
#include "percentile.h"
// ----------------------------------------------------------------------------
// median
struct grouping_percentile {
size_t series_size;
size_t next_pos;
NETDATA_DOUBLE percent;
NETDATA_DOUBLE *series;
};
static void grouping_create_percentile_internal(RRDR *r, const char *options, NETDATA_DOUBLE def) {
long entries = r->group;
if(entries < 10) entries = 10;
struct grouping_percentile *g = (struct grouping_percentile *)onewayalloc_callocz(r->internal.owa, 1, sizeof(struct grouping_percentile));
g->series = onewayalloc_mallocz(r->internal.owa, entries * sizeof(NETDATA_DOUBLE));
g->series_size = (size_t)entries;
g->percent = def;
if(options && *options) {
g->percent = str2ndd(options, NULL);
if(!netdata_double_isnumber(g->percent)) g->percent = 0.0;
if(g->percent < 0.0) g->percent = 0.0;
if(g->percent > 100.0) g->percent = 100.0;
}
g->percent = g->percent / 100.0;
r->internal.grouping_data = g;
}
void grouping_create_percentile25(RRDR *r, const char *options) {
grouping_create_percentile_internal(r, options, 25.0);
}
void grouping_create_percentile50(RRDR *r, const char *options) {
grouping_create_percentile_internal(r, options, 50.0);
}
void grouping_create_percentile75(RRDR *r, const char *options) {
grouping_create_percentile_internal(r, options, 75.0);
}
void grouping_create_percentile80(RRDR *r, const char *options) {
grouping_create_percentile_internal(r, options, 80.0);
}
void grouping_create_percentile90(RRDR *r, const char *options) {
grouping_create_percentile_internal(r, options, 90.0);
}
void grouping_create_percentile95(RRDR *r, const char *options) {
grouping_create_percentile_internal(r, options, 95.0);
}
void grouping_create_percentile97(RRDR *r, const char *options) {
grouping_create_percentile_internal(r, options, 97.0);
}
void grouping_create_percentile98(RRDR *r, const char *options) {
grouping_create_percentile_internal(r, options, 98.0);
}
void grouping_create_percentile99(RRDR *r, const char *options) {
grouping_create_percentile_internal(r, options, 99.0);
}
// resets when switches dimensions
// so, clear everything to restart
void grouping_reset_percentile(RRDR *r) {
struct grouping_percentile *g = (struct grouping_percentile *)r->internal.grouping_data;
g->next_pos = 0;
}
void grouping_free_percentile(RRDR *r) {
struct grouping_percentile *g = (struct grouping_percentile *)r->internal.grouping_data;
if(g) onewayalloc_freez(r->internal.owa, g->series);
onewayalloc_freez(r->internal.owa, r->internal.grouping_data);
r->internal.grouping_data = NULL;
}
void grouping_add_percentile(RRDR *r, NETDATA_DOUBLE value) {
struct grouping_percentile *g = (struct grouping_percentile *)r->internal.grouping_data;
if(unlikely(g->next_pos >= g->series_size)) {
g->series = onewayalloc_doublesize( r->internal.owa, g->series, g->series_size * sizeof(NETDATA_DOUBLE));
g->series_size *= 2;
}
g->series[g->next_pos++] = value;
}
NETDATA_DOUBLE grouping_flush_percentile(RRDR *r, RRDR_VALUE_FLAGS *rrdr_value_options_ptr) {
struct grouping_percentile *g = (struct grouping_percentile *)r->internal.grouping_data;
NETDATA_DOUBLE value;
size_t available_slots = g->next_pos;
if(unlikely(!available_slots)) {
value = 0.0;
*rrdr_value_options_ptr |= RRDR_VALUE_EMPTY;
}
else if(available_slots == 1) {
value = g->series[0];
}
else {
sort_series(g->series, available_slots);
NETDATA_DOUBLE min = g->series[0];
NETDATA_DOUBLE max = g->series[available_slots - 1];
if (min != max) {
size_t slots_to_use = (size_t)((NETDATA_DOUBLE)available_slots * g->percent);
if(!slots_to_use) slots_to_use = 1;
NETDATA_DOUBLE percent_to_use = (NETDATA_DOUBLE)slots_to_use / (NETDATA_DOUBLE)available_slots;
NETDATA_DOUBLE percent_delta = g->percent - percent_to_use;
NETDATA_DOUBLE percent_interpolation_slot = 0.0;
NETDATA_DOUBLE percent_last_slot = 0.0;
if(percent_delta > 0.0) {
NETDATA_DOUBLE percent_to_use_plus_1_slot = (NETDATA_DOUBLE)(slots_to_use + 1) / (NETDATA_DOUBLE)available_slots;
NETDATA_DOUBLE percent_1slot = percent_to_use_plus_1_slot - percent_to_use;
percent_interpolation_slot = percent_delta / percent_1slot;
percent_last_slot = 1 - percent_interpolation_slot;
}
int start_slot, stop_slot, step, last_slot, interpolation_slot;
if(min >= 0.0 && max >= 0.0) {
start_slot = 0;
stop_slot = start_slot + (int)slots_to_use;
last_slot = stop_slot - 1;
interpolation_slot = stop_slot;
step = 1;
}
else {
start_slot = (int)available_slots - 1;
stop_slot = start_slot - (int)slots_to_use;
last_slot = stop_slot + 1;
interpolation_slot = stop_slot;
step = -1;
}
value = 0.0;
for(int slot = start_slot; slot != stop_slot ; slot += step)
value += g->series[slot];
size_t counted = slots_to_use;
if(percent_interpolation_slot > 0.0 && interpolation_slot >= 0 && interpolation_slot < (int)available_slots) {
value += g->series[interpolation_slot] * percent_interpolation_slot;
value += g->series[last_slot] * percent_last_slot;
counted++;
}
value = value / (NETDATA_DOUBLE)counted;
}
else
value = min;
}
if(unlikely(!netdata_double_isnumber(value))) {
value = 0.0;
*rrdr_value_options_ptr |= RRDR_VALUE_EMPTY;
}
//log_series_to_stderr(g->series, g->next_pos, value, "percentile");
g->next_pos = 0;
return value;
}
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