diff options
Diffstat (limited to 'web/api/queries/ses/ses.c')
-rw-r--r-- | web/api/queries/ses/ses.c | 82 |
1 files changed, 0 insertions, 82 deletions
diff --git a/web/api/queries/ses/ses.c b/web/api/queries/ses/ses.c index ae4876395f..39eb445a01 100644 --- a/web/api/queries/ses/ses.c +++ b/web/api/queries/ses/ses.c @@ -6,85 +6,3 @@ // ---------------------------------------------------------------------------- // single exponential smoothing -struct grouping_ses { - NETDATA_DOUBLE alpha; - NETDATA_DOUBLE alpha_other; - NETDATA_DOUBLE level; - size_t count; -}; - -static size_t max_window_size = 15; - -void grouping_init_ses(void) { - long long ret = config_get_number(CONFIG_SECTION_WEB, "ses max window", (long long)max_window_size); - if(ret <= 1) { - config_set_number(CONFIG_SECTION_WEB, "ses max window", (long long)max_window_size); - } - else { - max_window_size = (size_t) ret; - } -} - -static inline NETDATA_DOUBLE window(RRDR *r, struct grouping_ses *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; - } - - return (points > (NETDATA_DOUBLE)max_window_size) ? (NETDATA_DOUBLE)max_window_size : points; -} - -static inline void set_alpha(RRDR *r, struct grouping_ses *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; -} - -void grouping_create_ses(RRDR *r, const char *options __maybe_unused) { - struct grouping_ses *g = (struct grouping_ses *)onewayalloc_callocz(r->internal.owa, 1, sizeof(struct grouping_ses)); - set_alpha(r, g); - g->level = 0.0; - r->time_grouping.data = g; -} - -// resets when switches dimensions -// so, clear everything to restart -void grouping_reset_ses(RRDR *r) { - struct grouping_ses *g = (struct grouping_ses *)r->time_grouping.data; - g->level = 0.0; - g->count = 0; -} - -void grouping_free_ses(RRDR *r) { - onewayalloc_freez(r->internal.owa, r->time_grouping.data); - r->time_grouping.data = NULL; -} - -void grouping_add_ses(RRDR *r, NETDATA_DOUBLE value) { - struct grouping_ses *g = (struct grouping_ses *)r->time_grouping.data; - - if(unlikely(!g->count)) - g->level = value; - - g->level = g->alpha * value + g->alpha_other * g->level; - g->count++; -} - -NETDATA_DOUBLE grouping_flush_ses(RRDR *r, RRDR_VALUE_FLAGS *rrdr_value_options_ptr) { - struct grouping_ses *g = (struct grouping_ses *)r->time_grouping.data; - - if(unlikely(!g->count || !netdata_double_isnumber(g->level))) { - *rrdr_value_options_ptr |= RRDR_VALUE_EMPTY; - return 0.0; - } - - return g->level; -} |