How to fixed CPU usage for a particular application in linux

megerdin · 10-21-2009, 08:13 AM

Just think,

I want to fixed maximum CPU usage 20% for OpenOffice writer.Is there a way to do it ? How?

Also is it possible for memory usage?

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Thanking you

normscherer · 10-21-2009, 07:02 PM

Quote:

Originally Posted by megerdin

Just think,

I want to fixed maximum CPU usage 20% for OpenOffice writer.Is there a way to do it ? How?

Also is it possible for memory usage?

---
Thanking you

Linux is intended (usually) as a interactive system and as such allocates cpu among tasks as they demand using algorithms that you can read about in the source. AFAIK there is no scheduling algorithm in use in the general purpose Linux distributions that would vary cpu allocations based on the filename associated with an application (and after all in Linux an application name is really just the name of the file you are running). If you want that, the source is available to you and you can make up your own scheduler to control cpu allocation and you can also do whatever you want to control memory usage.

Some of the 'real-time' Linux versions may give you some of what you are looking for.

chrism01 · 10-22-2009, 03:00 AM

Some combination of ulimit http://linux.die.net/man/1/ulimit and nice http://linux.die.net/man/1/nice

DJ Shaji · 11-01-2009, 01:42 AM

Quote:

Originally Posted by normscherer

AFAIK there is no scheduling algorithm in use in the general purpose Linux distributions that would vary cpu allocations based on the filename associated with an application

All distributions use exactly the same kernel.

Quote:

Originally Posted by normscherer

If you want that, the source is available to you and you can make up your own scheduler to control cpu allocation and you can also do whatever you want to control memory usage.

If he knew how to write his own scheduler, he wouldn't be asking this question :)

Quote:

Originally Posted by normscherer

Some of the 'real-time' Linux versions may give you some of what you are looking for.

[/quote]

They all use exactly the same kernel. Except of course embedded systems, which might use a modified ( and of course not easily replaceable ) kernel e.g. the Motorola V3i cellphone.

The new RCU implementation offers cgroups which have memory and cpu allocators. That might be the answer here.

See the kernel documentation.

syg00 · 11-01-2009, 01:56 AM

Not the easiest to set up but works fine.