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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2023-05-08 16:27:08 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2023-05-08 16:27:08 +0000 |
commit | 81581f9719bc56f01d5aa08952671d65fda9867a (patch) | |
tree | 0f5c6b6138bf169c23c9d24b1fc0a3521385cb18 /web/api/queries/des | |
parent | Releasing debian version 1.38.1-1. (diff) | |
download | netdata-81581f9719bc56f01d5aa08952671d65fda9867a.tar.xz netdata-81581f9719bc56f01d5aa08952671d65fda9867a.zip |
Merging upstream version 1.39.0.
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'web/api/queries/des')
-rw-r--r-- | web/api/queries/des/README.md | 4 | ||||
-rw-r--r-- | web/api/queries/des/des.c | 129 | ||||
-rw-r--r-- | web/api/queries/des/des.h | 133 |
3 files changed, 131 insertions, 135 deletions
diff --git a/web/api/queries/des/README.md b/web/api/queries/des/README.md index 33c5f1a0c..b12751a40 100644 --- a/web/api/queries/des/README.md +++ b/web/api/queries/des/README.md @@ -1,6 +1,10 @@ <!-- title: "double exponential smoothing" +sidebar_label: "double exponential smoothing" custom_edit_url: https://github.com/netdata/netdata/edit/master/web/api/queries/des/README.md +learn_status: "Published" +learn_topic_type: "References" +learn_rel_path: "Developers/Web/Api/Queries" --> # double exponential smoothing diff --git a/web/api/queries/des/des.c b/web/api/queries/des/des.c index a6c4e4051..d0e234e23 100644 --- a/web/api/queries/des/des.c +++ b/web/api/queries/des/des.c @@ -6,132 +6,3 @@ // ---------------------------------------------------------------------------- // single exponential smoothing - -struct grouping_des { - NETDATA_DOUBLE alpha; - NETDATA_DOUBLE alpha_other; - NETDATA_DOUBLE beta; - NETDATA_DOUBLE beta_other; - - NETDATA_DOUBLE level; - NETDATA_DOUBLE trend; - - size_t count; -}; - -static size_t max_window_size = 15; - -void grouping_init_des(void) { - long long ret = config_get_number(CONFIG_SECTION_WEB, "des max window", (long long)max_window_size); - if(ret <= 1) { - config_set_number(CONFIG_SECTION_WEB, "des max window", (long long)max_window_size); - } - else { - max_window_size = (size_t) ret; - } -} - -static inline NETDATA_DOUBLE window(RRDR *r, struct grouping_des *g) { - (void)g; - - NETDATA_DOUBLE points; - if(r->group == 1) { - // provide a running DES - points = (NETDATA_DOUBLE)r->internal.points_wanted; - } - else { - // provide a SES with flush points - points = (NETDATA_DOUBLE)r->group; - } - - // https://en.wikipedia.org/wiki/Moving_average#Exponential_moving_average - // A commonly used value for alpha is 2 / (N + 1) - return (points > (NETDATA_DOUBLE)max_window_size) ? (NETDATA_DOUBLE)max_window_size : points; -} - -static inline void set_alpha(RRDR *r, struct grouping_des *g) { - // https://en.wikipedia.org/wiki/Moving_average#Exponential_moving_average - // A commonly used value for alpha is 2 / (N + 1) - - g->alpha = 2.0 / (window(r, g) + 1.0); - g->alpha_other = 1.0 - g->alpha; - - //info("alpha for chart '%s' is " CALCULATED_NUMBER_FORMAT, r->st->name, g->alpha); -} - -static inline void set_beta(RRDR *r, struct grouping_des *g) { - // https://en.wikipedia.org/wiki/Moving_average#Exponential_moving_average - // A commonly used value for alpha is 2 / (N + 1) - - g->beta = 2.0 / (window(r, g) + 1.0); - g->beta_other = 1.0 - g->beta; - - //info("beta for chart '%s' is " CALCULATED_NUMBER_FORMAT, r->st->name, g->beta); -} - -void grouping_create_des(RRDR *r, const char *options __maybe_unused) { - struct grouping_des *g = (struct grouping_des *)onewayalloc_mallocz(r->internal.owa, sizeof(struct grouping_des)); - set_alpha(r, g); - set_beta(r, g); - g->level = 0.0; - g->trend = 0.0; - g->count = 0; - r->internal.grouping_data = g; -} - -// resets when switches dimensions -// so, clear everything to restart -void grouping_reset_des(RRDR *r) { - struct grouping_des *g = (struct grouping_des *)r->internal.grouping_data; - g->level = 0.0; - g->trend = 0.0; - g->count = 0; - - // fprintf(stderr, "\nDES: "); - -} - -void grouping_free_des(RRDR *r) { - onewayalloc_freez(r->internal.owa, r->internal.grouping_data); - r->internal.grouping_data = NULL; -} - -void grouping_add_des(RRDR *r, NETDATA_DOUBLE value) { - struct grouping_des *g = (struct grouping_des *)r->internal.grouping_data; - - if(likely(g->count > 0)) { - // we have at least a number so far - - if(unlikely(g->count == 1)) { - // the second value we got - g->trend = value - g->trend; - g->level = value; - } - - // for the values, except the first - NETDATA_DOUBLE last_level = g->level; - g->level = (g->alpha * value) + (g->alpha_other * (g->level + g->trend)); - g->trend = (g->beta * (g->level - last_level)) + (g->beta_other * g->trend); - } - else { - // the first value we got - g->level = g->trend = value; - } - - g->count++; - - //fprintf(stderr, "value: " CALCULATED_NUMBER_FORMAT ", level: " CALCULATED_NUMBER_FORMAT ", trend: " CALCULATED_NUMBER_FORMAT "\n", value, g->level, g->trend); -} - -NETDATA_DOUBLE grouping_flush_des(RRDR *r, RRDR_VALUE_FLAGS *rrdr_value_options_ptr) { - struct grouping_des *g = (struct grouping_des *)r->internal.grouping_data; - - if(unlikely(!g->count || !netdata_double_isnumber(g->level))) { - *rrdr_value_options_ptr |= RRDR_VALUE_EMPTY; - return 0.0; - } - - //fprintf(stderr, " RESULT for %zu values = " CALCULATED_NUMBER_FORMAT " \n", g->count, g->level); - - return g->level; -} diff --git a/web/api/queries/des/des.h b/web/api/queries/des/des.h index 05fa01b34..3153d497c 100644 --- a/web/api/queries/des/des.h +++ b/web/api/queries/des/des.h @@ -6,12 +6,133 @@ #include "../query.h" #include "../rrdr.h" -void grouping_init_des(void); +struct tg_des { + NETDATA_DOUBLE alpha; + NETDATA_DOUBLE alpha_other; + NETDATA_DOUBLE beta; + NETDATA_DOUBLE beta_other; -void grouping_create_des(RRDR *r, const char *options __maybe_unused); -void grouping_reset_des(RRDR *r); -void grouping_free_des(RRDR *r); -void grouping_add_des(RRDR *r, NETDATA_DOUBLE value); -NETDATA_DOUBLE grouping_flush_des(RRDR *r, RRDR_VALUE_FLAGS *rrdr_value_options_ptr); + NETDATA_DOUBLE level; + NETDATA_DOUBLE trend; + + size_t count; +}; + +static size_t tg_des_max_window_size = 15; + +static inline void tg_des_init(void) { + long long ret = config_get_number(CONFIG_SECTION_WEB, "des max tg_des_window", (long long)tg_des_max_window_size); + if(ret <= 1) { + config_set_number(CONFIG_SECTION_WEB, "des max tg_des_window", (long long)tg_des_max_window_size); + } + else { + tg_des_max_window_size = (size_t) ret; + } +} + +static inline NETDATA_DOUBLE tg_des_window(RRDR *r, struct tg_des *g) { + (void)g; + + NETDATA_DOUBLE points; + if(r->view.group == 1) { + // provide a running DES + points = (NETDATA_DOUBLE)r->time_grouping.points_wanted; + } + else { + // provide a SES with flush points + points = (NETDATA_DOUBLE)r->view.group; + } + + // https://en.wikipedia.org/wiki/Moving_average#Exponential_moving_average + // A commonly used value for alpha is 2 / (N + 1) + return (points > (NETDATA_DOUBLE)tg_des_max_window_size) ? (NETDATA_DOUBLE)tg_des_max_window_size : points; +} + +static inline void tg_des_set_alpha(RRDR *r, struct tg_des *g) { + // https://en.wikipedia.org/wiki/Moving_average#Exponential_moving_average + // A commonly used value for alpha is 2 / (N + 1) + + g->alpha = 2.0 / (tg_des_window(r, g) + 1.0); + g->alpha_other = 1.0 - g->alpha; + + //info("alpha for chart '%s' is " CALCULATED_NUMBER_FORMAT, r->st->name, g->alpha); +} + +static inline void tg_des_set_beta(RRDR *r, struct tg_des *g) { + // https://en.wikipedia.org/wiki/Moving_average#Exponential_moving_average + // A commonly used value for alpha is 2 / (N + 1) + + g->beta = 2.0 / (tg_des_window(r, g) + 1.0); + g->beta_other = 1.0 - g->beta; + + //info("beta for chart '%s' is " CALCULATED_NUMBER_FORMAT, r->st->name, g->beta); +} + +static inline void tg_des_create(RRDR *r, const char *options __maybe_unused) { + struct tg_des *g = (struct tg_des *)onewayalloc_mallocz(r->internal.owa, sizeof(struct tg_des)); + tg_des_set_alpha(r, g); + tg_des_set_beta(r, g); + g->level = 0.0; + g->trend = 0.0; + g->count = 0; + r->time_grouping.data = g; +} + +// resets when switches dimensions +// so, clear everything to restart +static inline void tg_des_reset(RRDR *r) { + struct tg_des *g = (struct tg_des *)r->time_grouping.data; + g->level = 0.0; + g->trend = 0.0; + g->count = 0; + + // fprintf(stderr, "\nDES: "); + +} + +static inline void tg_des_free(RRDR *r) { + onewayalloc_freez(r->internal.owa, r->time_grouping.data); + r->time_grouping.data = NULL; +} + +static inline void tg_des_add(RRDR *r, NETDATA_DOUBLE value) { + struct tg_des *g = (struct tg_des *)r->time_grouping.data; + + if(likely(g->count > 0)) { + // we have at least a number so far + + if(unlikely(g->count == 1)) { + // the second value we got + g->trend = value - g->trend; + g->level = value; + } + + // for the values, except the first + NETDATA_DOUBLE last_level = g->level; + g->level = (g->alpha * value) + (g->alpha_other * (g->level + g->trend)); + g->trend = (g->beta * (g->level - last_level)) + (g->beta_other * g->trend); + } + else { + // the first value we got + g->level = g->trend = value; + } + + g->count++; + + //fprintf(stderr, "value: " CALCULATED_NUMBER_FORMAT ", level: " CALCULATED_NUMBER_FORMAT ", trend: " CALCULATED_NUMBER_FORMAT "\n", value, g->level, g->trend); +} + +static inline NETDATA_DOUBLE tg_des_flush(RRDR *r, RRDR_VALUE_FLAGS *rrdr_value_options_ptr) { + struct tg_des *g = (struct tg_des *)r->time_grouping.data; + + if(unlikely(!g->count || !netdata_double_isnumber(g->level))) { + *rrdr_value_options_ptr |= RRDR_VALUE_EMPTY; + return 0.0; + } + + //fprintf(stderr, " RESULT for %zu values = " CALCULATED_NUMBER_FORMAT " \n", g->count, g->level); + + return g->level; +} #endif //NETDATA_API_QUERIES_DES_H |