Free Online Fossil CPU Load or Stress Test. Simulates CPU Partial or Full Load.

Home | PC Speed | Memory Load Test | CPU Load Test | System Information | Monitor Calibration | Uptime | Pixel Screen Ruler

Purpose

Use to load CPU:

• CPU burn-in test, stress test, stability test, temperature test, .
• Simulate an older, slower machine, for software development purposes
• Simulate heavy load on OS, to test system administration procedures. See Suggested Usage - System Administrator on the Memory Load Test page for details.
• Slow down speed of other applications to more easily observe their operation e.g. to read error messages that are displayed too quickly.
• Examine the behaviour of dual-core and other multi-core systems (check CPU utilization). At 100% Duty Cycle setting - is one core loaded to 100% the other unloaded, or both loaded to 100%, or both loaded to 50%?

Usage Notes

Use Fossil PC Speed to check PC speed reduction caused by this utility. Note Fossil PC Speed before and after running CPU Load Test.

For accurate results, run Fossil PC Speed in a separate process. Use ps or task manager, to display running processes, to confirm. To make sure of this, use a different web browser software (e.g. Firefox for PC Speed, Opera for CPU Load).

• Firefox will run all browser instances in the same process.
• As does Opera.
• IE6 will run each instance in a separate process, but only if not launched from an existing IE6 instance via File | New | Window.

CPU Load Test cannot seize more CPU resources than allocated by the OS to the web browser. To increase the CPU load:

• Increase the execution priority of the web browser process.
• Run more than one instance of CPU Load Test, in separate web browser processes.

Can be used to simulate application behaviour on older, slower machines

• Run Fossil PC Speed on unloaded, target old machine to get reading of its performance.
• On unloaded test/development machine (presumably newer and faster than target old machine), adjust CPU Load Test duty cycle, and number of web browser instances, until roughly the same Fossil PC Speed is obtained. Then run the application that is being developed, and test for acceptable response time, race conditions.
• If target old machine is not available, estimate a halving of Fossil PC Speed for every two years older than test/development machine. For example - test/development machine is new and Fossil PC Speed is 800. To simulate a four year old machine, configure CPU Load Test until the Fossil PC Speed is 200 (800 / 2 / 2).

Use at your own risk These online tools are meant to be used by IT professionals and power users. People who know what they are doing and who understand the limitations of web-based software recognize the possibility of bugs in software, the complexity of the interactions between applications, CPUs (including multi-core), RAM, operating system (task scheduler, memory manager etc). And therefore carefully interpret and check the results reported by any software. Contact Send compliments, suggestions, complaints to: Copyright This page and the JavaScript code in it, is copyright (c) 2007 by Yuen Kit Mun, all rights reserved. To support the development of this and other free software ("Free as in beer"), please don't copy the code or place the HTML file on an Internet web server (intranet or localhost web server is okay, don't remove this copyright notice). But do tell others about this URL. Original URL for this page is http://www.fossiltoys.com/cpuload.html