Memory usage

[tricarte]

Hello. Thanks for this library.

In the example code, you say there is no need to return the connection back as they will be returned when the coroutines are destroyed. I need a clarification here. Here is a sample code. Notice that I have changed the namespace but it is irrelevant at this point:

<?php

require __DIR__ . '/vendor/autoload.php';
(new Database\ConnectionPool\PDOConfig())
    ->withDriver('mysql')
    ->withHost('127.0.0.1')
    ->withDbname('someDatabase')
    ->withUsername('admin')
    ->withPassword('password')
    ->withCharset('utf8mb4')
    ->setConfig('default');

Database\ConnectionPool\PoolManager::addPool(2, 'default');

\Swoole\Runtime::enableCoroutine();
\Swoole\Coroutine::set(['hook_flags' => SWOOLE_HOOK_ALL]);

echo "Benchmark started\n";
for ($i = 0; $i < 15; $i++) {
    $s = microtime(true);
    \Swoole\Coroutine\run(function () {
        for ($i = 0; $i < 10000; $i++) {
            \Swoole\Coroutine::create(function () {
                $builder = Database\ConnectionPool\Adapter\Manager::table('people');
                $people = $builder->get('name');
            });
        }
    });
    echo 'Benchmark time:' . (microtime(true) - $s) . "second[s]\n";
}

sleep(5);

It's just your example with a sleep() added at the end. And I create 10000 coroutines in a loop exactly 15 times. On each iteration of the outer loop, the memory used raises. This is what I found abnormal. So the question is: Is this the normal behaviour?

Actually, I tried to integrate this library into another Swoole based web framework called Fomo. Interestingly when I benchmark the relevant url, on each benchmark, used memory keeps raising and raising.