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From Johan Corveleyn <jcor...@gmail.com>
Subject Re: svn merge operation extremely slow
Date Sun, 02 Oct 2011 21:58:33 GMT
On Sun, Oct 2, 2011 at 11:08 PM, Kyle Leber <kyle.leber@gmail.com> wrote:
> I was able to capture a profile from svn (after remembering I have to link
> statically).  I compiled with "-pg -O0" Here is the top of the file:
>
> Each sample counts as 0.01 seconds.
>   %   cumulative   self              self     total
>  time   seconds   seconds    calls   s/call   s/call  name
>  88.88    133.49   133.49 2002891836     0.00     0.00  svn_diff__snake
>   5.97    142.45     8.96       56     0.16     2.54  svn_diff(long,
char,
> short)
>   1.98    145.42     2.97  4163001     0.00     0.00  MD5Transform
>   0.41    146.04     0.62  4163001     0.00     0.00  Decode

What's it doing in svn_diff__snake (or svn_diff for that matter)? That
should only be hit when svn is doing textual merges (in which case it
must do rather expensive diff calculations --- I'm sure those
calculations can go ballistic when being confronted with a large
binary file, not consisting of text lines).

Are you sure those files were actually marked as binary (svn:mime-type
of application/octet-stream or something else non-texty)?

-- 
Johan

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