Nodejs app traag

Hoi,

Weet iemand waarom het 1.3+ seconden duurt om de pagina te laden?

Codeblok (voorbeeld.php):

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var express = require("express")
, app = express()
, info = require("./info")
, exec = require("child_process").exec;

app.set("view engine", "jade");
app.set("views", __dirname + "/views");

app.use(express.static("static"));

info.renew(function() {
function addZero(n) {
return (n < 9 ? n += "0" : n);
}
var infoTable = {
"Model": ["B+", "false"],
"Uptime": [info.get("Uptime"), "uptime"],
"Load average": [info.get("Load"), "load"],
"RAM usage": [info.get("Ram"), "ram"],
"Temperature": [info.get("Temp"), "temp"],
"Current clockspeed": [info.get("Current clockspeed"), "false"]
};

var updateDate = new Date();

app.get("/", function(req, res) {
res.render("index", {info: infoTable, updateDate: updateDate.getDate() + "-" + (updateDate.getMonth() + 1) + "-" + updateDate.getFullYear() + " " + updateDate.getHours() + ":" + addZero(updateDate.getMinutes()) + ":" + addZero(updateDate.getSeconds()) });
});

app.get("/update.json", function(req, res) {
res.setHeader("Content-type", "application/json");
res.send(JSON.stringify(infoTable));
});

app.listen(80);

console.log("Running");

setInterval(function() {
info.renew(function() {
infoTable = {
"Model": ["B+", "false"],
"Uptime": [info.get("Uptime"), "uptime"],
"Load average": [info.get("Load"), "load"],
"RAM usage": [info.get("Ram"), "ram"],
"Temperature": [info.get("Temp"), "temp"],
"Current clockspeed": [info.get("Current clockspeed"), "false"]
};
updateDate = new Date();
console.log("updated.");
});
}, 10000);
});

http://pi.dylaan.nl/

duurt hier 1.3 seconden

http://pi.dylaan.nl/update.json

duurt hier 54ms

ik denk dat het aan Jade ligt? update.json en de index maken beide gebruik van infoTable dus denk niet dat het aan deze file ligt:

Codeblok (voorbeeld.php):

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var exec = require("child_process").exec;

module.exports = {
data: [],
get: function(item) {
if(typeof this.data[item] != undefined) {
return this.data[item];
}

return undefined;
},
renew: function(callback) {
var that = this;
exec("cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq", function(err, result, errout) {
that.data["Current clockspeed"] = (result / 1000) + " MHz";
exec("cat /proc/uptime", function(err, result, errout) {
var uptime = parseInt(result.split(" ")[0]);
var days = Math.floor(uptime / 86400),
uptime = ( uptime % 86400),
hours = Math.floor(uptime / 3600),
uptime = ( uptime % 3600),
minutes = Math.floor(uptime / 60);
that.data["Uptime"] = days + " day" + (days == 1 ? " " : "s ") + hours + " hour" + (hours == 1 ? " " : "s ") + minutes + " minute" + (minutes == 1 ? "" : "s");
exec("cat /proc/loadavg", function(err, result, errout) {
var load = result.split(" ");
that.data["Load"] = load[0] + ", " + load[1] + ", " + load[2];
exec("cat /proc/meminfo | grep MemFree", function(err, result, errout) {
var ram = "";
result = result.match(/(d)+/);
ram += 483 - (Math.round(result[0] / 1024)) + "M/";
exec("cat /proc/meminfo | grep MemTotal", function(err, result, errout) {
result = result.match(/(d)+/);
ram += (Math.round(result[0] / 1024)) + "M";
that.data["Ram"] = ram;
exec("cat /sys/class/thermal/thermal_zone0/temp", function(err, result, errout) {
that.data["Temp"] = (result / 1000) + " °C";
callback();
});
});
});
});
});
});
}
};

jade:

Codeblok (voorbeeld.php):

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doctype html
html(lang="en")
head
meta(charset="UTF-8")
meta(name="robots", content="noindex, nofollow")
meta(name="googlebot", content="noindex, nofollow")
title pi.dylaan.nl

link(href="/style.css", rel="stylesheet")
script(src="https://cdnjs.cloudflare.com/ajax/libs/jquery/2.1.4/jquery.min.js")
script(src="/index.js")
body
#container
h1 Welcome on my Raspberry Pi!
p This Raspberry Pi is used for hosting smalll, private websites. Here are some statics about the Pi:
.someSpace
table
each val, index in info
tr
td= index
td(data-update=val[1])!= val[0]

.someSpace
p(style="text-align:center;") Last update: #{updateDate}

Heb gevonden dat het aan de server code ligt;

Debug wat. Log de tijd een paar keer in de server en kijk welke code zo lang duurt.

doe na elke exec eens kijken hoeveel ms er al voorbij gestreken zijn sinds begin van je app.