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/**
* Copyright (C) 2015 MongoDB Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* 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
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* 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 GNU Affero General 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 "mongo/platform/basic.h"
#include "mongo/executor/task_executor_pool.h"
#include <algorithm>
#include "mongo/db/server_parameters.h"
#include "mongo/executor/connection_pool_stats.h"
#include "mongo/executor/task_executor.h"
#include "mongo/util/processinfo.h"
namespace mongo {
namespace executor {
// If less than or equal to 0, the suggested pool size will be determined by the number of cores. If
// set to a particular positive value, this will be used as the pool size.
MONGO_EXPORT_SERVER_PARAMETER(taskExecutorPoolSize, int, 0);
size_t TaskExecutorPool::getSuggestedPoolSize() {
if (taskExecutorPoolSize > 0) {
return taskExecutorPoolSize;
}
ProcessInfo p;
unsigned numCores = p.getNumCores();
// Never suggest a number outside the range [4, 64].
return std::max(4U, std::min(64U, numCores));
}
void TaskExecutorPool::startup() {
invariant(!_executors.empty());
invariant(_fixedExecutor);
_fixedExecutor->startup();
for (auto&& exec : _executors) {
exec->startup();
}
}
void TaskExecutorPool::shutdownAndJoin() {
_fixedExecutor->shutdown();
_fixedExecutor->join();
for (auto&& exec : _executors) {
exec->shutdown();
exec->join();
}
}
void TaskExecutorPool::addExecutors(std::vector<std::unique_ptr<TaskExecutor>> executors,
std::unique_ptr<TaskExecutor> fixedExecutor) {
invariant(_executors.empty());
invariant(fixedExecutor);
invariant(!_fixedExecutor);
_fixedExecutor = std::move(fixedExecutor);
_executors = std::move(executors);
}
TaskExecutor* TaskExecutorPool::getArbitraryExecutor() {
invariant(!_executors.empty());
uint64_t idx = (_counter.fetchAndAdd(1) % _executors.size());
return _executors[idx].get();
}
TaskExecutor* TaskExecutorPool::getFixedExecutor() {
invariant(_fixedExecutor);
return _fixedExecutor.get();
}
void TaskExecutorPool::appendConnectionStats(ConnectionPoolStats* stats) const {
// Get stats from our fixed executor.
_fixedExecutor->appendConnectionStats(stats);
// Get stats from our pooled executors.
for (auto&& executor : _executors) {
executor->appendConnectionStats(stats);
}
}
} // namespace executor
} // namespace mongo
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