[Devel] Re: [ckrm-tech] [patch00/05]: Containers(V2)- Introduction

[Paul Menage]

On 9/20/06, Paul Jackson <pj at sgi.com> wrote:
>
> The way you "associate" a file with a cpuset is to have some task in
> that cpuset open that file and touch its pages -- where that task does
> so before any other would be user of the file.

An alternative would be a way of binding files (or directory
hierarchies) to a particular set of memory nodes. Then you wouldn't
need to pre-fault the data. Extended attributes might be one way of
doing it.

>
> Such pre-touching of files is common occurrence on the HPC (High Perf
> Comp.) apps that run on the big honkin NUMA iron where cpusets were
> born.  I'm guessing that someone hosting 5000 web servers would rather
> not deal with that particular hastle.

I'm looking at it from the perspective of job control systems that
need to have a good idea what big datasets the jobs running under them
are touching/sharing.

Paul