Re: [PATCH v3 30/30] t/perf: implement performace tests for pseudo-merge bitmaps

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On Tue, May 21, 2024 at 03:03:17PM -0400, Taylor Blau wrote:

> Implement a straightforward performance test demonstrating the benefit
> of pseudo-merge bitmaps by measuring how long it takes to count
> reachable objects in a few different scenarios:
> 
>   - without bitmaps, to demonstrate a reasonable baseline
>   - with bitmaps, but without pseudo-merges
>   - with bitmaps and pseudo-merges
> 
> Results from running this test on git.git are as follows:
> 
>     Test                                                                this tree
>     -----------------------------------------------------------------------------------
>     5333.2: git rev-list --count --all --objects (no bitmaps)           3.46(3.37+0.09)
>     5333.3: git rev-list --count --all --objects (no pseudo-merges)     0.13(0.11+0.01)
>     5333.4: git rev-list --count --all --objects (with pseudo-merges)   0.12(0.11+0.01)

That's not a very exciting result. I have a feeling that your git.git is
not a very interesting test case. We'd want a lot of refs, and ones that
are old and have bushy history that is not included in the more recent
branches. So something like a bunch of old unmerged pull request heads,
for example. ;) Do you have more interesting numbers for something like
that?

-Peff




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