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/**
* Copyright (C) 2021-present MongoDB, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the Server Side Public License, version 1,
* as published by MongoDB, Inc.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* Server Side Public License for more details.
*
* You should have received a copy of the Server Side Public License
* along with this program. If not, see
* <http://www.mongodb.com/licensing/server-side-public-license>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the Server Side Public License in all respects for
* all of the code used other than as permitted herein. If you modify file(s)
* with this exception, you may extend this exception to your version of the
* file(s), but you are not obligated to do so. If you do not wish to do so,
* delete this exception statement from your version. If you delete this
* exception statement from all source files in the program, then also delete
* it in the license file.
*/
#include <fmt/format.h>
#include <string>
#include "mongo/util/executor_stats.h"
#include "mongo/base/status.h"
namespace mongo {
namespace {
constexpr auto kMillisPerBucket = 50;
void recordDuration(Counter64* buckets, Milliseconds duration) {
size_t index;
if (duration < Milliseconds(1)) {
index = 0;
} else if (duration >= Seconds(1)) {
index = ExecutorStats::kNumBuckets - 1;
} else {
// Each bucket covers a 50 milliseconds window (e.g., [1, 50), [50, 100) and so on).
// That's why the duration (in milliseconds) is divided by 50 to compute the index.
index = 1 + durationCount<Milliseconds>(duration) / kMillisPerBucket;
}
buckets[index].increment();
}
void serializeBuckets(const Counter64* buckets, BSONObjBuilder bob) {
auto makeTag = [](size_t i) -> std::string {
if (i == 0)
return "0-999us";
if (i == ExecutorStats::kNumBuckets - 1)
return "1000ms+";
const auto lb = i > 1 ? (i - 1) * kMillisPerBucket : 1;
const auto ub = i * kMillisPerBucket - 1;
return fmt::format("{}-{}ms", lb, ub);
};
for (size_t i = 0; i < ExecutorStats::kNumBuckets; i++) {
bob.append(makeTag(i), buckets[i].get());
}
}
} // namespace
ExecutorStats::Task ExecutorStats::wrapTask(ExecutorStats::Task&& task) {
_scheduled.increment(1);
return [this, task = std::move(task), scheduledAt = _clkSource->now()](Status status) {
const auto startedAt = _clkSource->now();
recordDuration(_waitingBuckets, startedAt - scheduledAt);
task(std::move(status));
recordDuration(_runningBuckets, _clkSource->now() - startedAt);
_executed.increment(1);
};
}
void ExecutorStats::serialize(BSONObjBuilder* bob) const {
bob->append("scheduled"_sd, _scheduled.get());
bob->append("executed"_sd, _executed.get());
serializeBuckets(_waitingBuckets, bob->subobjStart("waitTime"_sd));
serializeBuckets(_runningBuckets, bob->subobjStart("runTime"_sd));
}
} // namespace mongo
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