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1 // SPDX-License-Identifier: GPL-3.0-or-later
2
3 #ifndef NETDATA_API_QUERIES_PERCENTILE_H
4 #define NETDATA_API_QUERIES_PERCENTILE_H
5
6 #include "../query.h"
7 #include "../rrdr.h"
8
9 struct tg_percentile {
10 size_t series_size;
11 size_t next_pos;
12 NETDATA_DOUBLE percent;
13
14 NETDATA_DOUBLE *series;
15 };
16
17 static inline void tg_percentile_create_internal(RRDR *r, const char *options, NETDATA_DOUBLE def) {
18 long entries = r->view.group;
19 if(entries < 10) entries = 10;
20
21 struct tg_percentile *g = (struct tg_percentile *)onewayalloc_callocz(r->internal.owa, 1, sizeof(struct tg_percentile));
22 g->series = onewayalloc_mallocz(r->internal.owa, entries * sizeof(NETDATA_DOUBLE));
23 g->series_size = (size_t)entries;
24
25 g->percent = def;
26 if(options && *options) {
27 g->percent = str2ndd(options, NULL);
28 if(!netdata_double_isnumber(g->percent)) g->percent = 0.0;
29 if(g->percent < 0.0) g->percent = 0.0;
30 if(g->percent > 100.0) g->percent = 100.0;
31 }
32
33 g->percent = g->percent / 100.0;
34 r->time_grouping.data = g;
35 }
36
37 static inline void tg_percentile_create_25(RRDR *r, const char *options) {
38 tg_percentile_create_internal(r, options, 25.0);
39 }
40 static inline void tg_percentile_create_50(RRDR *r, const char *options) {
41 tg_percentile_create_internal(r, options, 50.0);
42 }
43 static inline void tg_percentile_create_75(RRDR *r, const char *options) {
44 tg_percentile_create_internal(r, options, 75.0);
45 }
46 static inline void tg_percentile_create_80(RRDR *r, const char *options) {
47 tg_percentile_create_internal(r, options, 80.0);
48 }
49 static inline void tg_percentile_create_90(RRDR *r, const char *options) {
50 tg_percentile_create_internal(r, options, 90.0);
51 }
52 static inline void tg_percentile_create_95(RRDR *r, const char *options) {
53 tg_percentile_create_internal(r, options, 95.0);
54 }
55 static inline void tg_percentile_create_97(RRDR *r, const char *options) {
56 tg_percentile_create_internal(r, options, 97.0);
57 }
58 static inline void tg_percentile_create_98(RRDR *r, const char *options) {
59 tg_percentile_create_internal(r, options, 98.0);
60 }
61 static inline void tg_percentile_create_99(RRDR *r, const char *options) {
62 tg_percentile_create_internal(r, options, 99.0);
63 }
64
65 // resets when switches dimensions
66 // so, clear everything to restart
67 static inline void tg_percentile_reset(RRDR *r) {
68 struct tg_percentile *g = (struct tg_percentile *)r->time_grouping.data;
69 g->next_pos = 0;
70 }
71
72 static inline void tg_percentile_free(RRDR *r) {
73 struct tg_percentile *g = (struct tg_percentile *)r->time_grouping.data;
74 if(g) onewayalloc_freez(r->internal.owa, g->series);
75
76 onewayalloc_freez(r->internal.owa, r->time_grouping.data);
77 r->time_grouping.data = NULL;
78 }
79
80 static inline void tg_percentile_add(RRDR *r, NETDATA_DOUBLE value) {
81 struct tg_percentile *g = (struct tg_percentile *)r->time_grouping.data;
82
83 if(unlikely(g->next_pos >= g->series_size)) {
84 g->series = onewayalloc_doublesize( r->internal.owa, g->series, g->series_size * sizeof(NETDATA_DOUBLE));
85 g->series_size *= 2;
86 }
87
88 g->series[g->next_pos++] = value;
89 }
90
91 static inline NETDATA_DOUBLE tg_percentile_flush(RRDR *r, RRDR_VALUE_FLAGS *rrdr_value_options_ptr) {
92 struct tg_percentile *g = (struct tg_percentile *)r->time_grouping.data;
93
94 NETDATA_DOUBLE value;
95 size_t available_slots = g->next_pos;
96
97 if(unlikely(!available_slots)) {
98 value = 0.0;
99 *rrdr_value_options_ptr |= RRDR_VALUE_EMPTY;
100 }
101 else if(available_slots == 1) {
102 value = g->series[0];
103 }
104 else {
105 sort_series(g->series, available_slots);
106
107 NETDATA_DOUBLE min = g->series[0];
108 NETDATA_DOUBLE max = g->series[available_slots - 1];
109
110 if (min != max) {
111 size_t slots_to_use = (size_t)((NETDATA_DOUBLE)available_slots * g->percent);
112 if(!slots_to_use) slots_to_use = 1;
113
114 NETDATA_DOUBLE percent_to_use = (NETDATA_DOUBLE)slots_to_use / (NETDATA_DOUBLE)available_slots;
115 NETDATA_DOUBLE percent_delta = g->percent - percent_to_use;
116
117 NETDATA_DOUBLE percent_interpolation_slot = 0.0;
118 NETDATA_DOUBLE percent_last_slot = 0.0;
119 if(percent_delta > 0.0) {
120 NETDATA_DOUBLE percent_to_use_plus_1_slot = (NETDATA_DOUBLE)(slots_to_use + 1) / (NETDATA_DOUBLE)available_slots;
121 NETDATA_DOUBLE percent_1slot = percent_to_use_plus_1_slot - percent_to_use;
122
123 percent_interpolation_slot = percent_delta / percent_1slot;
124 percent_last_slot = 1 - percent_interpolation_slot;
125 }
126
127 int start_slot, stop_slot, step, last_slot, interpolation_slot;
128 if(min >= 0.0 && max >= 0.0) {
129 start_slot = 0;
130 stop_slot = start_slot + (int)slots_to_use;
131 last_slot = stop_slot - 1;
132 interpolation_slot = stop_slot;
133 step = 1;
134 }
135 else {
136 start_slot = (int)available_slots - 1;
137 stop_slot = start_slot - (int)slots_to_use;
138 last_slot = stop_slot + 1;
139 interpolation_slot = stop_slot;
140 step = -1;
141 }
142
143 value = 0.0;
144 for(int slot = start_slot; slot != stop_slot ; slot += step)
145 value += g->series[slot];
146
147 size_t counted = slots_to_use;
148 if(percent_interpolation_slot > 0.0 && interpolation_slot >= 0 && interpolation_slot < (int)available_slots) {
149 value += g->series[interpolation_slot] * percent_interpolation_slot;
150 value += g->series[last_slot] * percent_last_slot;
151 counted++;
152 }
153
154 value = value / (NETDATA_DOUBLE)counted;
155 }
156 else
157 value = min;
158 }
159
160 if(unlikely(!netdata_double_isnumber(value))) {
161 value = 0.0;
162 *rrdr_value_options_ptr |= RRDR_VALUE_EMPTY;
163 }
164
165 //log_series_to_stderr(g->series, g->next_pos, value, "percentile");
166
167 g->next_pos = 0;
168
169 return value;
170 }
171
172 #endif //NETDATA_API_QUERIES_PERCENTILE_H