我在尝试确定Web服务器(Cherokee)和expressjs网站之间的性能瓶颈方面遇到了相当困难的时间。expressjs压力测试
由于POST流量不断增加,我们开始不时发现性能问题。因此,我设计了一个测试,以查看网站1,2,3和4个实例的突破点是什么,并且由于糟糕的性能(每秒5个很好,每秒10个很差)而感到震惊。
根据我的性能记录,一个完整的请求开始到结束需要在1000-4000毫秒之间开始,并且在短时间开始后以线性趋势增加,以便约5分钟后请求需要40,000-60,0000女士。在开始到结束的请求expressjs网站记录性能记录需要100-400毫秒之间(大部分时间的这段时间90-390毫秒花费在等待的Java API响应)。
我已经调查了连接池/ MAX插槽,但是不知道如何使用这个表达,并与不断增长的交通我开始从wesite每降低性能感受湿热配置。
现在我有两个理论: 1.压力测试代码有一些真正的错误; 2.从压力测试应用程序或expressjs发送请求时,有一个小连接池。
如果上述任一情况属实,我不知道如何解决这些问题。
- 压力测试的应用程序 -
/*
* POST stress testing
*/
var rest = require("restler");
var u = require("../underscore")._;
var uuid = require("node-guid");
var fs = require("fs");
var quoteContent = fs.readFileSync(__dirname + "/data/quoteList.json");
var quotes = JSON.parse(quoteContent).quotes;
var feedListContent = fs.readFileSync(__dirname + "/data/feedList.json");
var feeds = JSON.parse(feedListContent).feeds;
var feedLength = feeds.length;
var experiment = { "users": 2, "frequency": 1000 };
// Clear memory out bit
quoteContent = null;
feedListContent = null;
console.log("Concurrent users:", experiment.users);
console.log("Every :", (experiment.frequency/1000) + " seconds");
setInterval(
function()
{
var rndQuote;
for(i=0;i<experiment.users;i++)
{
delayPost((experiment.frequency)/(experiment.users + 1));
}
}
, experiment.frequency);
function delayPost(delay)
{
setTimeout(
function()
{
rndQuote = getRandomQuote();
postToRandomFeed(rndQuote);
}
, delay);
}
function getRandomQuote()
{
var n = Math.floor(Math.random() * feedLength);
return quotes[n];
}
function postToRandomFeed(theQuote)
{
var n = Math.floor(Math.random() * feedLength);
var feed = feeds[n];
var kloudId = feed.kloudId
, feedId = feed._id
, uid = feed.owner["$oid"]
, url = "quote://" + uuid.new() // Generate random URL
, quote = theQuote.quote
, author = theQuote.author;
var data = { "url" : url, "title": quote, "text": quote, "tags": [author], "feeds": [ feedId ] }
, postTo = [ "http://127.0.0.1:4100/api/content/post/" + uid + "/wintermead" /*, "http://127.0.0.1:4101/api/content/post/" + uid + "/wintermead"*/ ]
, ports = [ 4100 ];
var st = gt();
var postUrl = postTo[ Math.floor(Math.random()*postTo.length) ];
console.log(postUrl);
rest.post(postUrl,
{
"data": data
, "headers":
{ "kloudid": kloudId, 'Connection':'close', 'Connection-Timeout': 10 }
}
).on('complete',
function(data, response)
{
gt("end: ",st);
if (response.statusCode == 202 ||response.statusCode == 201 || response.statusCode == 200)
{
try {
data =JSON.parse(data);
} catch(e) {}
if(data && data.error)
console.log("1", data.message);
else
console.log("2", data._id);
// you can get at the raw response like this...
}
else
{
console.log("! Error ", response.statusCode, data);
}
}
);
}
function gt(name, lastTime)
{
if(!name || name=="start")
{
var d = new Date().getTime();
var uu = uuid.new();
return (d + "|" + uu);
}
else if(lastTime)
{
var props = lastTime.split("|");
var time = parseInt(props[0]);
var uu = props[1];
console.log(uu, name, (new Date().getTime() - time));
}
else
{
console.log("logging: invalid start time " + name);
}
}