On Fri, Nov 4, 2016 at 12:49 PM, Markus Hitter <[email protected]> wrote:
>
> Hello all,

+cc Paul Mackeras, who maintains gitk.

>
> after Gitk brought my shabby development machine (Core2Duo, 4 GB RAM, Ubuntu 
> 16.10, no swap to save the SSD) to its knees once more than I'm comfortable 
> with, I decided to investigate this issue.
>
> Result of this investigation is, my Git repo has a commit with a diff of some 
> 365'000 lines and Gitk tries to display all of them, consuming more than 1.5 
> GB of memory.
>
> The solution is to cut off diffs at 50'000 lines for the display. This 
> consumes about 350 MB RAM, still a lot. These first 50'000 lines are shown, 
> followed by a copyable message on how to view the full diff on the command 
> line. Diffs shorter than this limit are displayed as before.

Bikeshedding: I'd argue to even lower the number to 5-10k lines.

>
> To test the waters whether such a change is welcome, here's the patch as I 
> currently use it. If this patch makes sense I'll happily apply change 
> requests and bring it more in line with Git's patch submission expectations.

I have never contributed to gitk myself,
which is hosted at git://ozlabs.org/~paulus/gitk
though I'd expect these guide lines would roughly apply:
https://github.com/git/git/blob/master/Documentation/SubmittingPatches

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