bug#43040: grep 3.4: memory leak

[Shlomi Fish]

On Mon, 7 Sep 2020 19:59:09 -0700
Paul Eggert <eggert@cs.ucla.edu> wrote:

> I don't see the extra memory consumption as necessarily being a bug, if grep
> is trading space (which is relatively cheap) for time (which is less so).
> Perhaps someone with some time to spare could look into that in more detail.
> 
> The excess CPU consumption is clearly problematic, though. I installed the 
> attached patches, which on your example causes 'grep' to be 3x faster than
> grep 3.3 was. I hope this addresses any practical performance problems
> uncovered by that artificial test case. The first patch is a bit of a hack
> but does the real work; the rest are merely cleanups or very minor
> performance improvements.

Thanks, Paul! I can confirm that the latest git master version of gnu grep
(which incorporates the patches) is faster than 3.4.

-- 

Shlomi Fish       https://www.shlomifish.org/
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