cpuhog

Is the cpuhog only for winNT?

anyone can show me some cpuhog program? :cool:

copy from http://downloads.securityfocus.com/l...t-vs-unix.pdf.

SYSTEMS AFFECTED
WinNT

PROBLEM
Applications can set their own priority level, which affects how

often Windows NT allows those applications to run. An application

running under a user account with administrative privileges can

set its priority to any of 32 levels, with the highest level

giving it more time slices. Applications running under accounts

without administrative privileges can set their priority to any

of the first 16 of those levels.

CpuHog sets its priority to the highest level available, which is

level 16 when run by a normal user. Windows NT attempts to deal

with CPU-hogging applications by boosting the priority of other

applications. However, Windows NT will only boost applications as

high as level 15. Thus, all other applications - even system

utilities such as Task Manager - never get a chance to execute

while CpuHog is running. CpuHog program can be found at

www.ntinternals.com. Credit for discovery of this bug goes to

Mark Russinovich.

EXPLOIT

SOLUTION
Give Task Manager level 16. In that way You will be able to kill

hogging process.

I've used it against Windows 2000. I think they fixed the problem with Win2k SP1.

Not completely sure, though.

Looks like it. Scheduling a task priority is built into W2k and higher. (Task Manager)

CPUHog is also good as a stress-tester. You can use it while running other programs to see how well your box (NT/2K/XP) will handle the load. Especially when hitting 100% CPU Usage. You can also find it with the NT Resource Kit.

One of the better stress testers that I have found is OpenSTA.

http://www.opensta.org/

It has a macro feature that records actions that can be played back against a host. The beauty is that you can simulate thousands of hosts should you wish.

I used this product against a major vendor's product which later proved to be a POS that cannot handle sustained load.

Anyway, give this app a chance. You have nothing to lose cause it is offered at the right price - free!!

:)

--TH13

in the /tmp directory, create a file called cpuhog
#!/bin/sh

# This script tries to consume all available cpu time

while :
do
junk="Let's try to waste valuable cpu cycles"
done
Make your script executable and run in background...

How *nix deal with the CPU process priority?

hen, linux has a http://www.xmailserver.org/linux-patches/cpuhog.c as scheduler...

too much to learn, wish 10 yrs younger!!
:o

Thanks, thehorse13, I am a wild horse who loves #13 too. :D

Sourceforge is a real good site, I got a lot of PHP code for my webstats, I just have a side question popup:

OpenSource is pretty good, but dont have much user-friendly or RAD products like windows support (or I dont know). I was working PHP use Maguma, phpedit,etc, manually code (of course I keep my class, function, module etc), but my boss uses codecharge, much fast RAD tool.

So is the future for open source or Microsoft? Before I was positive about Linux and use Redhat, but I felt sad when Redhat announced RHEL, and Novell's effort to push Suse didnt do well.

Which way to go, does Linux have promising future.....maybe Longhorn will say somthing about windows security?