Re: git-diff-tree inordinately (O(M*N)) slow on files with many changes

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Davide Libenzi <davidel@xxxxxxxxxxxxxxx> wrote:
> On Mon, 16 Oct 2006, Jim Meyering wrote:
>
>> Linus Torvalds <torvalds@xxxxxxxx> wrote:
>> > On Mon, 16 Oct 2006, Linus Torvalds wrote:
>> ...
>> > So I think xdiff has chosen too small a hash. Can you try what happens if
>> > you change xdl_hashbits() (in xdiff/xutil.c) instead? Try making it return
>> > a bigger value (for example, by initializing "bits" to 2 instead of 0),
>> > and see if that makes a difference.
>>
>> It makes no difference.
>>
>> Bear in mind that there are a *lot* of duplicate lines in the files
>> being compared: filtering each through "sort -u" removes 40-50k lines.
>
> Ok, try to bring down XDL_MAX_EQLIMIT to something like 8 or 16 ...

That helps a little.
Now, instead of taking 63s, my test takes ~30s.
(32 for XDL_MAX_EQLIMIT = 16, 30 for XDL_MAX_EQLIMIT = 8)
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