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Re: [PATCH] git-download: Speed up 'git-predicate'.

From: Ludovic Courtès
Subject: Re: [PATCH] git-download: Speed up 'git-predicate'.
Date: Wed, 07 Jun 2017 14:40:47 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/25.2 (gnu/linux)

Hi Christopher,

Christopher Baines <address@hidden> skribis:

> Running the current implementation of git-predicate on the guix
> repository with 50 trials takes:
>   real    0m5.374s
>   user    0m4.052s
>   sys     0m1.484s
> Compared to the following for the patched implementation:
>   real    0m8.398s
>   user    0m5.040s
>   sys     0m2.016s
> This shows that the patched implementation has decreased the
> performance. Using the real value, the test time has increased by ~3
> seconds. This corresponds roughly to a change from ~0.11 seconds
> previously, to ~0.17 seconds for each individual traversal of the entire
> repository.
> I encountered a performance issue when trying to use git-predicate with
> this repository [2], which I have written a Guix package for here [3].
> Instead of the 1463 files that git ls-files reports locally for the guix
> repository, smart-answers contains 26732 files.
> The running time with smart-answers is left as an exercise to the
> reader, all I can say is that on my machine, it takes more than 40
> minutes for just 1 trial.
> Using this patch, running the test script with 1 trial gives:
>   real    0m4.917s
>   user    0m3.640s
>   sys     0m1.428s

So in short, the new implementation is 100 times faster on large repos
but roughly the same or slightly slower on smaller repos, right?

Thanks for fixing this!


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