Optimizing application loading (was Re: Great new kernel 2.4.20-13.9!)

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On Fri, May 16, 2003 at 01:37:45PM -0700, J Sloan wrote:
> If you are daring enough, prelink+2.5.6x
> is _seriously_ snappy -

Prelinking works great.
 
One thing that I've wondered about, but haven't had time to benchmark,
is whether a full backup/restore (poor man's layout optimizer) has any
noticeable effect on performance, with or without the Ext3 Orlov allocator.

rpm copies a file here and a file there, whereas after a backup/restore,
one can create the tree in a well-prescribed order (typically depth-first
or breadth-first).

I have several machines which I've "cloned" from a clean install using a
boot disk and rsync, but they are unfortunately all on different hardware,
and thus not comparable.

Hans Reiser plans a background "repacker" for reiser4 that will optimize
layout.

Regards,

	Bill Rugolsky




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