Re: CPU overhead when handling large files?

["D. Stimits" <stimits@attbi.com>]

Seung-yeong Oh wrote:

> Hello,
> Originally, I installed RedHat7.2 + SGI XFS 1.0.2.
> I now have fully updated RedHat7.2 + SGI XFS 1.2pre5 (rebuilt kernel RPM
> to be installed on RedHat 7.x).
> For current seup, I'm wondering if the following behavior is normal;
> When handling large files, for example, copying a few 700MB files from
> one directory to another, at some point in the middle of the process or
> at the end of it, the process hangs for several minutes taking up 99% of
> CPU.
> A friend of mine told me it might take some time to rewrite inodes as
> it's a journaling file system, but I don't remember the XFS acted this
> way before when I was using 1.0.2 of it. And 1.1 for that matter...
> I'd appreciate any input. Thank you.
> Have a nice weekend.
>
FYI, if you use IDE drives, and do not have UDMA on, it will always use 
tons of cpu power to do copies, no matter what filesystem.

D. Stimits, stimits AT attbi DOT com