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Re: svn edit

From: Greg Stein <gstein_at_gmail.com>
Date: Wed, 29 Oct 2008 05:00:40 -0700

Cool. That would be around my expectation for our performance in
wc-ng: just a quick walk of the tree calling lstat(), looking for size
changes or timestamp changes.

Also, recall that I had planned to have a mode for 'svn stat' that
only looks at the metadata (adds, removes, etc), but without a crawl.
I didn't think a simple crawl would be so fast. I think, for now, that
I'm going to punt on the idea of a no-crawl status mode. No reason to
monkey up status with Yet Another Command Line Switch when it can go
this fast (and think about the typical case!).

And think about hot caches! My Macbook can "find . | wc -l" across
170k files in just 5 seconds.

Thanks,
-g

On Wed, Oct 29, 2008 at 1:02 AM, Philipp Marek
<philipp.marek_at_emerion.com> wrote:
> On Tuesday, 28. October 2008, Harvey, Edward wrote:
>> I'm not sure what you mean by "with full caches" or "keep access more
>> local" but I do know this - I created a similar python script to walk a
>> tree.
>> With cold cache, local disk, python walking the tree on 100,000
>> files takes approx 10 sec With cold cache, local disk, "svn stat" on 17,000
>> files (50,000 including .svn dirs) takes approx 4 mins With cold cache,
>> local disk, "git status" on 17,000 files (30,000 including .git dirs) takes
>> approx 2 mins Perforce is able to do this is zero time. (a few ms)
> In case anybody's interested, here are some performance numbers for FSVS -
> which walks the whole tree, too.
>
>
> Example: ~22K files, notebook (slow harddisk) with 1.6GHz CPU, cold cache,
> entries known (so a checkout, and not a completely new import); FSVS uses no
> .svn dirs:
>
> dolly:/example# find . | wc -l
> 22147
> # Clear cache
> dolly:/example# echo 3 > /proc/sys/vm/drop_caches
> # fsvs with cold cache, but using a sorted list of existing entries -
> # harddisk doesn't need to seek as much
> dolly:/example# time fsvs st > /dev/null
>
> real 0m6.000s
> user 0m0.240s
> sys 0m0.372s
>
> (This was taken from the documentation at
> http://fsvs.tigris.org/source/browse/fsvs/trunk/fsvs/doc/PERFORMANCE?rev=972&view=markup)
>
> If someone wants to know numbers for some "enterprise" machines (raid), I can
> provide them, too.
>
>
> Regards,
>
> Phil
>
>
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Received on 2008-10-29 13:00:56 CET

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