Re: [PATCH 4/4] t5326: test propagating hashcache values

From: Junio C Hamano <gitster@pobox.com>
Date: Sep 14, 2021, 02:05 UTC
Message-ID: <xmqqpmtbc3o3.fsf@gitster.g>
In-Reply-To: <YT/3BuDa7KfUN/38@nand.local>

Taylor Blau <me@ttaylorr.com> writes:

> Alas, there they are. They are basically no different than having the
> name-hash for single pack bitmaps, it's just now we don't throw them
> away when generating a MIDX bitmap from a state where the repository
> already has a single-pack bitmap.

I actually wasn't expecting any CPU/time difference.

I hope that we are talking about the same name-hash, which is used to sort the blobs so that when pack-objects try to find a good delta base, the blobs from the same path will sit close to each other and hopefully fit in the pack window.

The effect I was hoping to see by not discarding the information was that we find better delta base hence smaller deltas in the resulting packfiles.

Thanks.

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