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Re: [PATCH] Optionally use deltas in dumpfiles

From: Greg Hudson <ghudson_at_MIT.EDU>
Date: 2004-03-29 20:10:09 CEST

On Mon, 2004-03-29 at 08:53, Tobias Ringstrom wrote:
> It would be very interesting to hear what the size is of a dump of the
> subversion repository for the following cases, and also how long the
> dump (including any compression) takes:
>
> 1. fulltext dump
> 2. fulltext dump + "gzip -9"
> 3. fulltext dump + "bzip2 -9"
> 4. delta dump
> 5. delta dump + "gzip -9"
> 6. delta dump + "bzip2 -9"

I realize you retracted this question, but I do have some new numbers.

On the time issue, I just calculated the times for the dumps themselves,
without any compression, because I wanted to run five tests and average
and doing that six times is a lot. I got 104.904u 12.344s 2:09.36 for a
standard dump and 292.826u 26.162s 5:20.84 for a delta dump, or about
two and a half times as long for a delta dump. Not too surprising.

For the sizes:

  1. 648479605
  2. 144751988
  3. 99624568
  4. 24649260 (3.8% as big as (1))
  5. 14154777 (9.8% as big as (2))
  6. 12709484 (12.8% as big as (3))

These numbers are different from the ones I sent earlier because I've
enabled deltas against the empty source for adds without history.

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Received on Mon Mar 29 20:10:40 2004

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