问题
I am comparing node.js versus PHP in terms of write performance to MySQL database. I am using Apache Benchmark, linux Mint in virtual machine, newest mysql-server(5.5.43) and driver for MySQL with node.js from here. The code I used is
server.js
var http = require('http');
var mysql = require('mysql');
var server = http.createServer(function (req, res) {
var connection = mysql.createConnection({
host : 'localhost',
user : 'root',
password : 'root',
database : 'testDB'
});
connection.connect();
connection.query("INSERT INTO Persons (LastName, FirstName, Address, City) VALUES ('Futterkiste', 'Alfreds', 'Obere Str. 57', 'Berlin')", function(err, rows, fields) {
if (!err)
console.log('The solution is: ', rows);
else
console.log('Error while performing Query.');
});
connection.end();
res.writeHead(200, {'Content-Type': 'text/plain'});
res.end('Hello World');
});
server.listen(1337, '127.0.0.1');
console.log('Server running at http://127.0.0.1:1337/');
index.php
$servername = "localhost";
$username = "root";
$password = "root";
$dbname = "testDB";
try {
$conn = new PDO("mysql:host=$servername;dbname=$dbname", $username, $password);
// set the PDO error mode to exception
$conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
$sql = "INSERT INTO Persons (LastName, FirstName, Address, City) VALUES ('Futterkiste', 'Alfreds', 'Obere Str. 57', 'Berlin')";
// use exec() because no results are returned
$conn->exec($sql);
echo "New record created successfully";
}
catch(PDOException $e)
{
echo $sql . "<br>" . $e->getMessage();
}
$conn = null;
echo "Hello world";
?>
Apache Benchmark to Apache2 server with index.php file
ab -n 1000 -c 100 http://localhost/
PHP MySQL write performance
Concurrency Level: 100
Time taken for tests: 1.328 seconds
Complete requests: 1000
Failed requests: 0
Total transferred: 230000 bytes
HTML transferred: 43000 bytes
Requests per second: 752.99 [#/sec] (mean)
Time per request: 132.804 [ms] (mean)
Time per request: 1.328 [ms] (mean, across all concurrent requests)
Transfer rate: 169.13 [Kbytes/sec] received
Apache Benchmark to node.js server in server.js file
ab -n 1000 -c 100 http://localhost:1337/
node.js MySQL write performance
Concurrency Level: 100
Time taken for tests: 3.896 seconds
Complete requests: 1000
Failed requests: 0
Total transferred: 113000 bytes
HTML transferred: 12000 bytes
Requests per second: 256.68 [#/sec] (mean)
Time per request: 389.585 [ms] (mean)
Time per request: 3.896 [ms] (mean, across all concurrent requests)
Transfer rate: 28.33 [Kbytes/sec] received
I was under the impression that node.js outperforms PHP in I/O database operations. So it surprises me that no matter which SQL statement I try (also tried SELECT * FROM Persons) node.js turns out worse.
Not only that but also when cuncurrency level is 100, node logs a ton of 'Error while performing Query.' messages to the console and only ~500 out of 1000 requests get written to the database. Are mysql node drivers just that bad or I am doing something very wrong here? I would really appreciate your help :)
Thank you
回答1:
First of all you didn't finish server.js code. There is a bug with too many connections opened to DB. To fix this I used connectionPool. And second of all Apache use workers to run many copies of same script in parallel.
Now the result for Apache + PHP + MySQL (XAMP) as a reference point:
Concurrency Level: 100
Time taken for tests: 7.476 seconds
Complete requests: 1000
Failed requests: 0
Total transferred: 230000 bytes
HTML transferred: 42000 bytes
Requests per second: 133.77 [#/sec] (mean)
Time per request: 747.557 [ms] (mean)
Time per request: 7.476 [ms] (mean, across all concurrent requests)
Transfer rate: 30.05 [Kbytes/sec] received
Now to equal the chances I fixed server.js
var http = require('http');
var mysql = require('mysql');
var connection = mysql.createPool({
connectionLimit: 10,
host : 'localhost',
user : 'test',
password : 'test',
database : 'testDB'
});
var server = http.createServer(function (req, res) {
connection.query("INSERT INTO Persons (LastName, FirstName, Address, City) VALUES ('Futterkiste', 'Alfreds', 'Obere Str. 57', 'Berlin')", function(err, rows, fields) {
if (!err)
console.log('The solution is: ', rows);
else {
console.log('Error while performing Query.');
}
res.writeHead(200, {'Content-Type': 'text/plain'});
res.end('Hello World');
});
});
server.listen(1337, '127.0.0.1');
server.on('close', function() {
connection.end();
})
console.log('Server running at http://127.0.0.1:1337/');
And results of Node + MySQL:
Concurrency Level: 100
Time taken for tests: 7.289 seconds
Complete requests: 1000
Failed requests: 0
Total transferred: 112000 bytes
HTML transferred: 11000 bytes
Requests per second: 137.19 [#/sec] (mean)
Time per request: 728.899 [ms] (mean)
Time per request: 7.289 [ms] (mean, across all concurrent requests)
Transfer rate: 15.01 [Kbytes/sec] received
As you can see the results are very close. But this is one node process against 11 Apache workers. What happens if I add clusters to the equation? Here is the modified code:
var http = require('http');
var mysql = require('mysql');
var cluster = require('cluster');
if (cluster.isMaster) {
cluster.fork();
cluster.fork();
cluster.fork();
cluster.fork();
} else {
var connection = mysql.createPool({
connectionLimit: 10,
host : 'localhost',
user : 'test',
password : 'test',
database : 'testDB'
});
var server = http.createServer(function (req, res) {
connection.query("INSERT INTO Persons (LastName, FirstName, Address, City) VALUES ('Futterkiste', 'Alfreds', 'Obere Str. 57', 'Berlin')", function(err, rows, fields) {
if (!err)
console.log('The solution is: ', rows);
else {
console.log('Error while performing Query.');
}
res.writeHead(200, {'Content-Type': 'text/plain'});
res.end('Hello World');
});
});
server.listen(1337, '127.0.0.1');
server.on('close', function() {
connection.end();
})
console.log('Server running at http://127.0.0.1:1337/ worker:' + cluster.worker.id);
}
Four node workers results:
Concurrency Level: 100
Time taken for tests: 2.782 seconds
Complete requests: 1000
Failed requests: 0
Total transferred: 112000 bytes
HTML transferred: 11000 bytes
Requests per second: 359.48 [#/sec] (mean)
Time per request: 278.179 [ms] (mean)
Time per request: 2.782 [ms] (mean, across all concurrent requests)
Transfer rate: 39.32 [Kbytes/sec] received
For curiosity I add results for node with 10 workers:
Concurrency Level: 100
Time taken for tests: 2.647 seconds
Complete requests: 1000
Failed requests: 0
Total transferred: 112000 bytes
HTML transferred: 11000 bytes
Requests per second: 377.84 [#/sec] (mean)
Time per request: 264.665 [ms] (mean)
Time per request: 2.647 [ms] (mean, across all concurrent requests)
Transfer rate: 41.33 [Kbytes/sec] received
My laptop is Core2Duo T6600, Ubuntu 14.04.3, php 5.5.9, node 0.10.37, mysql 5.5.44
来源：https://stackoverflow.com/questions/30014256/node-js-mysql-performance