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From: Taylor Blau <me@ttaylorr.com>
To: Jeff King <peff@peff.net>
Cc: Taylor Blau <me@ttaylorr.com>, Teng Long <dyroneteng@gmail.com>,
	avarab@gmail.com, derrickstolee@github.com, git@vger.kernel.org,
	gitster@pobox.com, tenglong.tl@alibaba-inc.com
Subject: Re: [PATCH v3 1/2] pack-bitmap.c: remove unnecessary "open_pack_index()" calls
Date: Mon, 14 Nov 2022 17:50:43 -0500	[thread overview]
Message-ID: <Y3LGQ+yV1lJiWR21@nand.local> (raw)
In-Reply-To: <Y3LBtl+x2rCzsoIh@coredump.intra.peff.net>

On Mon, Nov 14, 2022 at 05:31:18PM -0500, Jeff King wrote:
> Yeah, I agree that 1k is a lot more compelling. The big impractical
> thing I think is that if the bitmapped pack is older (and it usually
> is), then we'd often open all the other packs anyway:
>
>   - if the start of the traversal is in the bitmapped pack, then we
>     fruitlessly open each of the others looking for the object (since
>     the bitmapped one will come last in the reverse-chronological
>     sorting)
>
>   - if it isn't in the bitmapped pack, then we'll end up opening all
>     those other packs anyway to fill out the bitmap (since by definition
>     it can't be included in the on-disk bitmaps)
>
> So I'd be surprised if it ever mattered in the real world. Though again,
> I think the new code is less surprising in general, and could matter if
> we changed other things (e.g., if we prioritized lookups in a pack with
> a .bitmap).

I completely agree. It's definitely worth doing purely based on the
principle of least-surprise. But the potential performance improvements
are just gravy on top ;-).

Thanks,
Taylor

  reply	other threads:[~2022-11-14 22:50 UTC|newest]

Thread overview: 67+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-08-26  7:09 [PATCH 0/1] pack-bitmap.c: avoid exposing absolute paths Teng Long
2022-08-26  7:09 ` [PATCH 1/1] " Teng Long
2022-08-26 16:34 ` [PATCH 0/1] " Junio C Hamano
2022-08-29  2:48   ` Teng Long
2022-10-26 21:42     ` Taylor Blau
2022-10-26 23:19       ` Ævar Arnfjörð Bjarmason
2022-10-31 13:20         ` Teng Long
2022-10-27 20:45       ` Jeff King
2022-10-30 18:42         ` Taylor Blau
2022-10-31 12:22           ` [PATCH 0/1] pack-bitmap.c: avoid exposing absolute paths Taylor Blau <me@ttaylorr.com> writes: Teng Long
2022-11-02  5:37         ` [PATCH 0/1] pack-bitmap.c: avoid exposing absolute paths Teng Long
2022-11-02  7:54           ` Jeff King
2022-11-02 13:52             ` Teng Long
2022-10-31 13:13       ` Teng Long
2022-11-03  1:00         ` Taylor Blau
2022-11-02  9:20 ` Ævar Arnfjörð Bjarmason
2022-11-02 13:04   ` Teng Long
2022-11-02 12:56 ` [PATCH v2 " Teng Long
2022-11-02 12:56   ` [PATCH v2 1/1] " Teng Long
2022-11-03  1:16     ` Taylor Blau
2022-11-03  9:35       ` Teng Long
2022-11-05  0:35         ` Taylor Blau
2022-11-03  1:21   ` [PATCH v2 0/1] " Taylor Blau
2022-11-03  8:42     ` Teng Long
2022-11-04  3:17   ` [PATCH v3 0/2] " Teng Long
2022-11-04  3:17     ` [PATCH v3 1/2] " Teng Long
2022-11-04 22:11       ` Taylor Blau
2022-11-04  3:17     ` [PATCH v3 2/2] pack-bitmap.c: remove unnecessary "open_pack_index()" calls Teng Long
2022-11-04 22:09       ` Taylor Blau
2022-11-04 22:13     ` [PATCH v3 0/2] pack-bitmap.c: avoid exposing absolute paths Taylor Blau
2022-11-10  7:10     ` Teng Long
2022-11-10  7:10       ` [PATCH v3 1/2] pack-bitmap.c: remove unnecessary "open_pack_index()" calls Teng Long
2022-11-14 22:03         ` Jeff King
2022-11-14 22:14           ` Taylor Blau
2022-11-14 22:31             ` Jeff King
2022-11-14 22:50               ` Taylor Blau [this message]
2022-11-10  7:10       ` [PATCH v3 2/2] pack-bitmap.c: avoid exposing absolute paths Teng Long
2022-11-11 22:26       ` [PATCH v3 0/2] " Taylor Blau
2022-11-14 22:23         ` Jeff King
2022-11-17 14:19           ` Teng Long
2022-11-17 15:03             ` Jeff King
2022-11-17 21:57               ` Taylor Blau
2022-11-21  3:27                 ` Teng Long
2022-11-21 12:16     ` [PATCH v4 0/4] " Teng Long
2022-11-21 12:16       ` [PATCH v4 1/4] pack-bitmap.c: remove unnecessary "open_pack_index()" calls Teng Long
2022-11-21 12:16       ` [PATCH v4 2/4] pack-bitmap.c: avoid exposing absolute paths Teng Long
2022-11-21 12:16       ` [PATCH v4 3/4] pack-bitmap.c: break out of the bitmap loop early if not tracing Teng Long
2022-11-21 23:27         ` Junio C Hamano
2022-11-28 13:09           ` Teng Long
2022-11-21 12:16       ` [PATCH v4 4/4] pack-bitmap.c: trace bitmap ignore logs when midx-bitmap is found Teng Long
2022-11-21 19:09         ` Jeff King
2022-11-21 23:29           ` Junio C Hamano
2022-11-28 12:29             ` Teng Long
2022-11-28 12:37           ` Teng Long
2022-11-29  1:27             ` Jeff King
2022-11-29 13:14               ` Teng Long
2022-11-21 19:04       ` [PATCH v4 0/4] pack-bitmap.c: avoid exposing absolute paths Jeff King
2022-11-28 12:48         ` Teng Long
2022-11-28 14:09       ` [PATCH v5 " Teng Long
2022-11-28 14:09         ` [PATCH v5 1/4] pack-bitmap.c: remove unnecessary "open_pack_index()" calls Teng Long
2022-11-28 14:09         ` [PATCH v5 2/4] pack-bitmap.c: avoid exposing absolute paths Teng Long
2022-11-28 14:09         ` [PATCH v5 3/4] pack-bitmap.c: break out of the bitmap loop early if not tracing Teng Long
2022-11-28 23:26           ` Taylor Blau
2022-11-29 13:17             ` Teng Long
2022-11-28 14:09         ` [PATCH v5 4/4] pack-bitmap.c: trace bitmap ignore logs when midx-bitmap is found Teng Long
2022-11-28 23:30         ` [PATCH v5 0/4] pack-bitmap.c: avoid exposing absolute paths Taylor Blau
2022-11-29 13:21           ` Teng Long

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