124 lines
3.6 KiB
C++
124 lines
3.6 KiB
C++
/*
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* Stats.actor.cpp
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*
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* This source file is part of the FoundationDB open source project
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*
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* Copyright 2013-2022 Apple Inc. and the FoundationDB project authors
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "fdbrpc/Stats.h"
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#include "flow/actorcompiler.h" // has to be last include
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Counter::Counter(std::string const& name, CounterCollection& collection)
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: name(name), interval_start(0), last_event(0), interval_sq_time(0), roughness_interval_start(0), interval_delta(0),
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interval_start_value(0) {
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metric.init(collection.name + "." + (char)toupper(name.at(0)) + name.substr(1), collection.id);
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collection.counters.push_back(this);
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}
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void Counter::operator+=(Value delta) {
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if (!delta)
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return; //< Otherwise last_event will be reset
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interval_delta += delta;
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auto t = now();
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auto elapsed = t - last_event;
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interval_sq_time += elapsed * elapsed;
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last_event = t;
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metric += delta;
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}
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double Counter::getRate() const {
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double elapsed = now() - interval_start;
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return elapsed > 0 ? interval_delta / elapsed : 0;
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}
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double Counter::getRoughness() const {
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double elapsed = last_event - roughness_interval_start;
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if (elapsed == 0) {
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return -1;
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}
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// If we have time interval samples t in T, and let:
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// n = size(T) = interval_delta
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// m = mean(T) = elapsed / interval_delta
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// v = sum(t^2) for t in T = interval_sq_time
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//
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// The formula below is: (v/(m*n)) / m - 1
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// This is equivalent to (v/n - m^2) / m^2 = Variance(T)/m^2
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// Variance(T)/m^2 is equal to Variance(t/m) for t in T
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double delay = interval_sq_time / elapsed;
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return delay * interval_delta / elapsed - 1;
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}
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void Counter::resetInterval() {
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interval_start_value += interval_delta;
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interval_delta = 0;
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interval_sq_time = 0;
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interval_start = now();
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if (last_event == 0) {
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last_event = interval_start;
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}
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roughness_interval_start = last_event;
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}
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void Counter::clear() {
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resetInterval();
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interval_start_value = 0;
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metric = 0;
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}
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void CounterCollection::logToTraceEvent(TraceEvent& te) const {
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for (ICounter* c : counters) {
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te.detail(c->getName().c_str(), c);
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c->resetInterval();
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}
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}
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ACTOR Future<Void> traceCounters(std::string traceEventName,
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UID traceEventID,
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double interval,
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CounterCollection* counters,
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std::string trackLatestName,
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std::function<void(TraceEvent&)> decorator) {
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wait(delay(0)); // Give an opportunity for all members used in special counters to be initialized
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for (ICounter* c : counters->counters)
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c->resetInterval();
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state Reference<EventCacheHolder> traceEventHolder;
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if (!trackLatestName.empty()) {
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traceEventHolder = makeReference<EventCacheHolder>(trackLatestName);
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}
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state double last_interval = now();
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loop {
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TraceEvent te(traceEventName.c_str(), traceEventID);
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te.detail("Elapsed", now() - last_interval);
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counters->logToTraceEvent(te);
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decorator(te);
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if (!trackLatestName.empty()) {
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te.trackLatest(traceEventHolder->trackingKey);
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}
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last_interval = now();
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wait(delay(interval, TaskPriority::FlushTrace));
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}
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}
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