Re: Directory deltification

Hyrum K Wright <hyrum.wright_at_wandisco.com> writes:

> On Tue, Jan 3, 2012 at 8:23 AM, Philip Martin
> <philip.martin_at_wandisco.com> wrote:
>> I've been testing this with the old CollabNet Subversion repository, the
>> first 40,515 Subversion revisions, on my Linux laptop:
>>
>> The db/revs directory (unpacked) is 320MB instead of 490MB.
>> Loading takes about 12% more CPU.
>> Dumping takes about 22% more CPU.
>>
>> which matches your results.  Packing removes about 85MB for both
>> repositories.
>>
>> There are operations where reading the directory representations is more
>> dominant.  'svn log' on a path inside the repository uses 100% more CPU.
>
> Is that peak CPU or overall? If the I/O overhead went down, I'd
> expect the peak CPU usage to go up, but the overall operation time to
> drop.

That's overall CPU used, so the runtime for 'svn log' doubles when the
repository is in RAM.

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