How to get CPU utilization using Javascript or Java

How can I get the CPU utilization of client's machine.

I have created a Java web application and where I need to get the CPU utilization of client's machine.

Can it be done using either Javascrip开发者_JAVA百科t or Java?

---

Whatever you use, Java or Javascript, you can't get CPU utilization of the client's machine. That will be a huge security risk. The only way to do it will be to install a plug-in. This wouldn't help too much however, as reading the CPU utilization is platform specific.

---

@Daniel provides a link to a method that (on a good day) would give an approximate measure of CPU usage.

@kgiannakakis says that this would be a serious security risk.

But I wonder. How could an attacker exploit CPU usage levels to compromise the user machine's security, or steal sensitive information about the user? Off the top of my head, I cannot think of anything realistic.

The only possible risk I can think of would be if the attacker had already installed/launched some spy software somewhere else on the user's machine. The ability to measure CPU usage could be used to implement a "covert channel" to get information from the spy s/w to the outside world. But this is only of theoretical interest (unless you are trying to implement A1 / A2 level security).

---

It may look like a security risk, but there is a technique to get an estimate of the CPU usage with JavaScript inside the browser. You may want to check this article:

• Ajaxian - JPU: JavaScript CPU Monitor (Demo here)

As kgiannakakis noted in a comment below, this calculation is based on the delay of setInterval() calls.

I remember seeing a similar implementation on Mindmeister.com (showing the CPU usage while editing a mind map.)

---

There is simple example of a CPU usage monitor demonstrates how to use XML DOM capabilities of client JavaScript in a BSP application to dynamically request data from server and adjust corresponding elements of the screen without reloading the whole page.

This article might be helpful.

---

jni concept for cpu utilization

http://www.javaworld.com/javaworld/javaqa/2002-11/01-qa-1108-cpu.html?page=1

try this link

---

If its java look at OperatingSystemMXBean using the please be aware this is Java 1.6 only.

OperatingSystemMXBean operatingSystemInfo = 
    (com.sun.management.OperatingSystemMXBean)ManagementFactory.getOperatingSystemMXBean();

I am not sure how well this works in an applet.

---

I once looked into creating a Web Start application that could be launched by a user to "scan" their system hardware. Luckily, the targeted systems were Windows boxes, so I used the Jacob package (Google or search this site for info) to do a WMI query for things like serial numbers, etc.

I created a proof of concept Swing client app, but never got around to the Web Start portion.