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Avoid recalculating timeval that doesn't change for life of RateMeter

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This commit is contained in:
dmiller 2024-06-26 21:54:28 +00:00
parent 7b20a38099
commit ba249b2d65
2 changed files with 9 additions and 5 deletions
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12
timing.cc
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@ -302,6 +302,8 @@ RateMeter::RateMeter(double current_rate_history) {
stop_tv.tv_usec = 0;
last_update_tv.tv_sec = 0;
last_update_tv.tv_usec = 0;
history_threshold.tv_sec = 0;
history_threshold.tv_usec = 0;
total = 0.0;
current_rate = 0.0;
assert(!isSet(&start_tv));
@ -315,6 +317,10 @@ void RateMeter::start(const struct timeval *now) {
gettimeofday(&start_tv, NULL);
else
start_tv = *now;
/* Find the time current_rate_history seconds after the start. That's our
threshold for deciding how far back to look for moving average. */
TIMEVAL_ADD(history_threshold, start_tv,
(time_t) (current_rate_history * 1000000.0));
}
void RateMeter::stop(const struct timeval *now) {
@ -369,11 +375,7 @@ void RateMeter::update(double amount, const struct timeval *now) {
/* Find out how far back in time to look. We want to look back
current_rate_history seconds, or to when the last update occurred,
whichever is longer. However, we never look past the start. */
struct timeval tmp;
/* Find the time current_rate_history seconds after the start. That's our
threshold for deciding how far back to look. */
TIMEVAL_ADD(tmp, start_tv, (time_t) (current_rate_history * 1000000.0));
if (TIMEVAL_AFTER(*now, tmp))
if (TIMEVAL_AFTER(*now, history_threshold))
interval = MAX(current_rate_history, diff);
else
interval = TIMEVAL_FSEC_SUBTRACT(*now, start_tv);

2
timing.h
View file

@ -183,6 +183,8 @@ class RateMeter {
struct timeval stop_tv;
/* The last time the current sample rates were updated. */
struct timeval last_update_tv;
/* The time current_rate_history after start_tv. */
struct timeval history_threshold;
double total;
double current_rate;