AsyncMysqlClientStats::callbackDelayMicrosAvg
Average delay between when a callback is scheduled in the MySQL client and when it's actually ran, in microseconds
public function callbackDelayMicrosAvg(): float;
The callback can be from creating a connection, inducing an error condition, executing a query, etc.
This returns an exponentially-smoothed average.
Returns
float
- Afloat
representing the average callback delay on this MySQL client.
Examples
The following example describes how to get the average delay time between when a callback is scheduled (in this case, performing the connection) and when the callback actual ran (in this case, when the connection was actually established) via AsyncMysqlClientStats::callbackDelayMicrosAvg
.
require __DIR__.'/../../__includes/async_mysql_connect.inc.php';
use \Hack\UserDocumentation\API\Examples\AsyncMysql\ConnectionInfo as CI;
async function connect(
\AsyncMysqlConnectionPool $pool,
): Awaitable<\AsyncMysqlConnection> {
return await $pool->connect(
CI::$host,
CI::$port,
CI::$db,
CI::$user,
CI::$passwd,
);
}
async function get_delay(): Awaitable<?float> {
$pool = new \AsyncMysqlConnectionPool(darray[]);
$conn = await connect($pool);
$delay = $conn->connectResult()?->clientStats()?->callbackDelayMicrosAvg();
$conn->close();
return $delay;
}
function run(): void {
$d = \HH\Asio\join(get_delay());
\var_dump($d);
}
run();
float(11.98046875)