erdgeist at erdgeist.org
Wed May 31 08:11:24 PDT 2006
On Wed, 31 May 2006, Eugene M. Kim wrote:
> read throughput was exactly twice as high as the tape write throughput,
> throughout the entire dump phases 4 and 5, i.e. dumping actual inodes.
> Disappointing, because the tape drive utilization (%busy) was lingering
> around 35%-50% for most of the time; I didn't expect the disk would be
> the bottleneck. :p
I had a similar experience when dumping my mailserver. In addition I
noticed that for a user with >300000 files (spam mails) in one directory
it caused dump to sit back and think for half an hour before proceeding.
I always resolved to look into the code to find something O(x^n) but
didn't have the real urge. DID someone here look into that?
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