Re: Subversion Performance Benchmark

Daniel Berlin <dberlin@dberlin.org> writes:

> But, given what you say, and that vdelta *was* the biggest time user,
> one of the following must hold:
>
> 1. You are wrong, and we are supposed to be storing everything
> non-fulltext (deltas against itself)

Highly unlikely. :-)

> 2. Subversion is buggy, and it is storing non-fulltext when it
> shouldn't be

Also not the case. Do an initial import of something, and use db_dump
to examine the strings table. On my machine, there is nary a single
chunk of svndiff data.

> 3. Subversion is buggy, and it is doing deltas and throwing them away.

*Ding!* Subversion is using svndiff to *transmit* the text. Those diff
packages usually break down to:

   'S'
   'V'
   'N'
   \0
   <flag that means 'here comes some new data'>
   <here's the whole file as fulltext>

but the fact remains that we are attempting to svndiff-ify a "delta"
that is effectively an "add" of the entire file.

And the repository is unpacking that stuff and storing the original
fulltext.

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Received on Tue Sep 24 19:18:33 2002