generating 100% load for cyclictest ?

generating 100% load for cyclictest ?

[Steven Scholz]

Hi,

on http://rt.wiki.kernel.org/index.php/Cyclictest some test cases mention a
"100% load".

How is this load created? Any recommendations?

I am testing on an embedded system with a small rootfs. So I don't have a
gcc running on the target that could compile the kernel or something ...

Thanks.

-- 
Steven

Re: generating 100% load for cyclictest ?

[Robert Schwebel]

On Thu, Jan 11, 2007 at 03:56:09PM +0100, Steven Scholz wrote:
> How is this load created? Any recommendations?

At least these should generate significant load:

- hackbench
- while true; do find /; done
- calibrator (for cache load)

Robert
-- 
 Dipl.-Ing. Robert Schwebel | http://www.pengutronix.de
 Pengutronix - Linux Solutions for Science and Industry
   Handelsregister:  Amtsgericht Hildesheim, HRA 2686
     Hannoversche Str. 2, 31134 Hildesheim, Germany
   Phone: +49-5121-206917-0 |  Fax: +49-5121-206917-9

Re: generating 100% load for cyclictest ?

[Steven Scholz]

Robert,

>> How is this load created? Any recommendations?
> 
> At least these should generate significant load:
> 
> - hackbench
> - while true; do find /; done
> - calibrator (for cache load)

Thanks.

And of course all running at the same time?

--
Steven

Re: generating 100% load for cyclictest ?

[Luotao Fu]

[-- Attachment #1: Type: text/plain, Size: 1253 bytes --]

Hi,

On Thu, Jan 11, 2007 at 03:56:09PM +0100, Steven Scholz wrote:
> Hi,
> 
> on http://rt.wiki.kernel.org/index.php/Cyclictest some test cases mention a
> "100% load".
> 
> How is this load created? Any recommendations?
> 
> I am testing on an embedded system with a small rootfs. So I don't have a
> gcc running on the target that could compile the kernel or something ...

Even Without extra softwares you can easily produce custom load in 
many manners. i.E. you can cause a high CPU consumption by simple doing
cat /dev/zero >/dev/null
or you can grab another machine in the network to do some flood pings
towards the emb. system, which will cause high frequented irqs on the
network device.
If you just want to give your machine some custom load, this should be
enough. If you want to analyze the system in some specific load
situation, you might want to take some benchmarking tools. Hackbench is
i.E. a good start.

cheers
Luotao Fu
-- 
     Dipl.-Ing. Luotao Fu | http://www.pengutronix.de
  Pengutronix - Linux Solutions for Science and Industry
    Handelsregister: Amtsgericht Hildesheim, HRA 2686
      Hannoversche Str. 2, 31134 Hildesheim, Germany
    Phone: +49-5121-206917-0 |  Fax: +49-5121-206917-9


[-- Attachment #2: Digital signature --]
[-- Type: application/pgp-signature, Size: 189 bytes --]