[webkit-dev] webkit-patch and SVN

[Darin Fisher]

On Wed, Apr 14, 2010 at 5:06 PM, Adam Barth <abarth at webkit.org> wrote:

> On Wed, Apr 14, 2010 at 4:52 PM, Geoffrey Garen <ggaren at apple.com> wrote:
> >> I'd rather keep the current behavior and have it operate on the entire
> >> repository. I think it will be too easy to make mistakes and leave out
> >> large portions of a patch if it only operates upon the current working
> >> directory.
> >
> > That's a fixable mistake, though, if/when it happens.
> >
> > Taking huge amounts of time unnecessarily diff'ing the LayoutTests
> directory is a fixed cost that is unavoidable and unfixable.
>
> How long is a huge amount of time?  Here are some stats from my
> laptop.  In the first run, I suspect webkit was not in my disk cache
> (since I recently compiled another checkout):
>
> ~/svn/webkit3$ time svn diff
> real    0m23.437s
> user    0m1.936s
> sys     0m7.531s
>
> In the second run, I suspect webkit was in my disk cache:
>
> ~/svn/webkit3$ time svn diff
> real    0m8.929s
> user    0m2.019s
> sys     0m6.012s
>
> ~/svn/webkit3$ svn --version
> svn, version 1.6.3 (r38063)
>
> If the diff is taking much longer than these times, you probably have
> a borked SVN working copy.  We've seen really slow working copies when
> the working copy was created with SVN 1.5 and then upgraded to 1.6.
> If your SVN is slow, you might consider blowing away your working copy
> and making a new one with SVN 1.6.
>
> Adam



This may not seem like a huge difference, but 23 seconds is enough to
encourage me to "cd WebCore" before running svn-create-patch or
prepare-ChangeLog.

-Darin
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