[LITMUS^RT] Clustered scheduling in litmus under qemu

[Glenn Elliott]

Hi Youcef,

How is C-EDF configured for clustering?  You can configure clustering around different cache levels by writing the appropriate value to /proc/litmus/<something>/C-EDF/clustering.  However, I don't recall being able to set up shared caches, so this would mean that C-EDF (as is) can only work as P-EDF or G-EDF under qemu.  I think you might have to change C-EDF to force the clustering you want.

-Glenn


On Jul 4, 2012, at 12:01 PM, Youcef Amine Benabbas wrote:

> Hi all,
> 
> I am trying to run litmus under qemu, simulating a system with 4 sockets
> and 6 cores per socket.
> 
> Unfortunately, when I switch to the C-EDF scheduler, it  groups all cpus
> under oner cluster; One would expect cpus to be grouped at least into
> clusters of 4 cpus each, in order to make use of the  L3 cache.
> 
> Did anyone try to do this before? should I run litmus on a real machine
> to get clustering correctly?
> 
> Best regards,
> Youcef 
> 
> 
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