CPU usage program

[sethukr]

Hi everybody,

Can anyone give me a simple program which would consumes more CPU
usage (more than 50%) in windows?

Thanks,
Sethu

[santosh]

se*****@gmail.com wrote:

Hi everybody,

Can anyone give me a simple program which would consumes more CPU
usage (more than 50%) in windows?

int main(void)
{
volatile unsigned long i = 0;
for (;;) i++;
return 0;
}

[Tor Rustad]

se*****@gmail.com wrote:

Hi everybody,

Can anyone give me a simple program which would consumes more CPU
usage (more than 50%) in windows?

The OS will try to stop such an application for consuming CPU cycles, so
either you need to write a *rootkit*, or fool the OS billing system.
Both methods, require *off-topic* code, which can be used by any
*clueless* script kid, to attack computer systems.
The <se*****@gmail.comaccount, may already be tracked by US
authorities, so I suggest you go under ground... before getting into
trouble. :)
--
Tor <torust [at] online [dot] no>

[Keith Thompson]

Tor Rustad <to********@hotmail.comwrites:

se*****@gmail.com wrote:

>Can anyone give me a simple program which would consumes more CPU
usage (more than 50%) in windows?

The OS will try to stop such an application for consuming CPU cycles,
so either you need to write a *rootkit*, or fool the OS billing system.

[...]

<OT>
Windows prevents any process from consuming more than 50% of the CPU?
Really? How do I enable this?
</OT>

--
Keith Thompson (The_Other_Keith) ks***@mib.org <http://www.ghoti.net/~kst>
San Diego Supercomputer Center <* <http://users.sdsc.edu/~kst>
"We must do something. This is something. Therefore, we must do this."
-- Antony Jay and Jonathan Lynn, "Yes Minister"

[Richard Tobin]

In article <11*********************@22g2000hsm.googlegroups.c om>,
se*****@gmail.com <se*****@gmail.comwrote:

>Can anyone give me a simple program which would consumes more CPU
usage (more than 50%) in windows?

Either have fewer than two CPUs (increasingly tricky these days), or
write a multi-threaded program.

-- Richard
--
"Consideration shall be given to the need for as many as 32 characters
in some alphabets" - X3.4, 1963.

[Richard Heathfield]

Keith Thompson said:

<snip>

Windows prevents any process from consuming more than 50% of the CPU?

Yes. It achieves this by using 51% of the CPU itself.

<g,d&r>

--
Richard Heathfield <http://www.cpax.org.uk>
Email: -http://www. +rjh@
Google users: <http://www.cpax.org.uk/prg/writings/googly.php>
"Usenet is a strange place" - dmr 29 July 1999

[Eric Sosman]

Keith Thompson wrote On 10/08/07 16:33,:

Tor Rustad <to********@hotmail.comwrites:

>>se*****@gmail.com wrote:

>>>Can anyone give me a simple program which would consumes more CPU
usage (more than 50%) in windows?

The OS will try to stop such an application for consuming CPU cycles,
so either you need to write a *rootkit*, or fool the OS billing system.

[...]

<OT>
Windows prevents any process from consuming more than 50% of the CPU?
Really? How do I enable this?
</OT>

<OT>

Press the Windows "flag" key, press U, press U again.
(YMMV on non-English installations.)

</OT>

--
Er*********@sun.com

[Martien Verbruggen]

On 8 Oct 2007 20:24:04 GMT,
Richard Tobin <ri*****@cogsci.ed.ac.ukwrote:

In article <11*********************@22g2000hsm.googlegroups.c om>,
se*****@gmail.com <se*****@gmail.comwrote:

>>Can anyone give me a simple program which would consumes more CPU
usage (more than 50%) in windows?

Either have fewer than two CPUs (increasingly tricky these days), or
write a multi-threaded program.

Or run more than one copy of the same program.

Martien
--
|
Martien Verbruggen | Freudian slip: when you say one thing but
| mean your mother.
|

[Mark McIntyre]

On Mon, 08 Oct 2007 17:21:52 -0400, in comp.lang.c , Eric Sosman
<Er*********@sun.comwrote:

Press the Windows "flag" key, press U, press U again.
(YMMV on non-English installations.)

Amusingly, Windows-U on my XP box invokes the Screen Magnifier and
attempts to read the menus to me...
--
Mark McIntyre

"Debugging is twice as hard as writing the code in the first place.
Therefore, if you write the code as cleverly as possible, you are,
by definition, not smart enough to debug it."
--Brian Kernighan

[Tor Rustad]

Keith Thompson wrote:

Tor Rustad <to********@hotmail.comwrites:

>se*****@gmail.com wrote:

>>Can anyone give me a simple program which would consumes more CPU
usage (more than 50%) in windows?

The OS will try to stop such an application for consuming CPU cycles,
so either you need to write a *rootkit*, or fool the OS billing system.

[...]

<OT>
Windows prevents any process from consuming more than 50% of the CPU?
Really? How do I enable this?
</OT>

Keith, very off-topic! *shocked*

Try: remove the buggy kernel mode code, and see SetPriorityClass() and
SetThreadPriority() WIN32 API for ideas. :-P

For Linux, BSD, Solaris, AIX, HPUX and Windows, user land programs can
consume more than >50% CPU. BUT, those OS'es try to avoid this, by
scheduling time interrupts, which bill the running process/thread. When
it's quota is up, the kernel scheduler typically put the running user
mode process/thread to sleep. I'm not sure what the actual limit is on
Windows, but it's there.

See e.g. "Modern Operating Systems" 2.ed, p.796, Tanenbaum.

--
Tor <torust [at] online [dot] no>

[Richard Tobin]

In article <fP*********************@telenor.com>,
Tor Rustad <to********@hotmail.comwrote:

>For Linux, BSD, Solaris, AIX, HPUX and Windows, user land programs can
consume more than >50% CPU. BUT, those OS'es try to avoid this

General purpose operating systems try to allocate time fairly between
processes. If there are no other processes wanting the CPU, there is
no reason for the OS to stop a process from using 100%.

Most systems have a mechanism to give a process a higher or lower
priority if requested ("nice" in traditional unix).

-- Richard
--
"Consideration shall be given to the need for as many as 32 characters
in some alphabets" - X3.4, 1963.

[Tor Rustad]

Richard Tobin wrote:

In article <fP*********************@telenor.com>,
Tor Rustad <to********@hotmail.comwrote:

>For Linux, BSD, Solaris, AIX, HPUX and Windows, user land programs can
consume more than >50% CPU. BUT, those OS'es try to avoid this

General purpose operating systems try to allocate time fairly between
processes. If there are no other processes wanting the CPU, there is
no reason for the OS to stop a process from using 100%.

No process in user mode, will normally be able to gain 100%, except for
a *very* short time. Kernel will interrupt it, and do the scheduling and
it's internal work.

However, most likely OP was sitting with a dual core CPU... :)

--
Tor <torust [at] online [dot] no>

[Peter Pichler]

Mark McIntyre wrote:

On Mon, 08 Oct 2007 17:21:52 -0400, in comp.lang.c , Eric Sosman
<Er*********@sun.comwrote:

> Press the Windows "flag" key, press U, press U again.
(YMMV on non-English installations.)

Amusingly, Windows-U on my XP box invokes the Screen Magnifier and
attempts to read the menus to me...

Try doing it in sequence, as Eric Sosman suggested.