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From: Abhradeep Chakraborty <chakrabortyabhradeep79@gmail.com>
To: Derrick Stolee <derrickstolee@github.com>
Cc: Abhradeep Chakraborty <chakrabortyabhradeep79@gmail.com>,
	Git <git@vger.kernel.org>,
	Kaartic Sivaraam <kaartic.sivaraam@gmail.com>,
	Taylor Blau <me@ttaylorr.com>
Subject: Re: [PATCH v2 4/6] pack-bitmap: prepare to read lookup table
Date: Mon, 27 Jun 2022 23:36:18 +0530	[thread overview]
Message-ID: <20220627180618.16291-1-chakrabortyabhradeep79@gmail.com> (raw)
In-Reply-To: <cebad3da-5779-5908-15d5-63d4c590c20b@github.com>

Derrick Stolee <derrickstolee@github.com> wrote:

> I didn't check the previous patches, but your sign-off should be the
> last line of the message. (You are singing off on all previous content,
> and any later content is not covered by your sign-off.)

Ohhh, got it. I didn't know about it before.

> nit: This alignment should use four spaces at the end so the second phrase
> matches the start of the previous phrase. Like this:
>
>		if (flags & BITMAP_OPT_LOOKUP_TABLE &&
>		    git_env_bool("GIT_TEST_READ_COMMIT_TABLE", 1)) {
>
> Perhaps it looked right in your editor because it renders tabs as 4 spaces
> instead of 8 spaces.

I don't know why but my editor sometimes do some weird things for alignments.
I generally use VS Code. But for alignment related problems, sometimes I have
to use vi editor.

> Here, we _do_ want to keep the st_mult(). Is the st_add() still necessary? It
> seems this is a leftover from the previous version that had the 4-byte flag
> data.
>
> We set table_size to zero above. We could drop that initialization and instead
> have this after the "size_t triplet_sz" definition:
>
>			size_t table_size = st_mult(ntohl(header->entry_count),
>						    triplet_sz));

Yes, you're right. Will update.

> I expected something different: binary search on the triplets where the comparison is
> made by looking up the OID from the [multi-]pack-index and comparing that OID to the
> commit OID we are looking for.
>
> I'm not convinced that the binary search I had in mind is meaningfully faster than
> what you've implemented here, so I'm happy to leave it as you have it. We can investigate
> if that full search on the pack-index matters at all (it probably doesn't).

Good idea! Thanks!

> While there is potential that this is wasteful, it's probably not that huge,
> so we can start with the "maximum XOR depth" and then reconsider a smaller
> allocation in the future.

Ok.

> We should consider ensuring that also "size < bitmap_git->entry_count".
> Better yet, create an xor_positions_alloc variable that is initialized
> to the entry_count value.
>
> "size" should probably be xor_positions_nr.
> 
> > +			xor_positions[size++] = xor_pos;
> > +			triplet = bitmap_get_triplet(bitmap_git, xor_pos);
> > +			xor_pos = triplet_get_xor_pos(triplet);
> > +		}
> 
> (at this point, "if (xor_positions_nr >= xor_positions_alloc)", then error
> out since the file must be malformed with an XOR loop.)

Got it.

> Since we are storing the bitmap here as we "pop" the stack, should we be
> looking for a stored bitmap while pushing to the stack in the previous loop?
> That would save time when using multiple bitmaps with common XOR bases.

Yeah, I also am thinking about it. Will make a try.

Thanks :)

  reply	other threads:[~2022-06-27 18:07 UTC|newest]

Thread overview: 162+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-06-20 12:33 [PATCH 0/6] [GSoC] bitmap: integrate a lookup table extension to the bitmap format Abhradeep Chakraborty via GitGitGadget
2022-06-20 12:33 ` [PATCH 1/6] Documentation/technical: describe bitmap lookup table extension Abhradeep Chakraborty via GitGitGadget
2022-06-20 16:56   ` Derrick Stolee
2022-06-20 17:09     ` Taylor Blau
2022-06-21  8:31       ` Abhradeep Chakraborty
2022-06-22 16:26         ` Taylor Blau
2022-06-21  8:23     ` Abhradeep Chakraborty
2022-06-20 17:21   ` Taylor Blau
2022-06-21  9:22     ` Abhradeep Chakraborty
2022-06-22 16:29       ` Taylor Blau
2022-06-22 16:45         ` Abhradeep Chakraborty
2022-06-20 20:21   ` Derrick Stolee
2022-06-21 10:08     ` Abhradeep Chakraborty
2022-06-22 16:30       ` Taylor Blau
2022-06-20 12:33 ` [PATCH 2/6] pack-bitmap: prepare to read " Abhradeep Chakraborty via GitGitGadget
2022-06-20 20:49   ` Derrick Stolee
2022-06-21 10:28     ` Abhradeep Chakraborty
2022-06-20 22:06   ` Taylor Blau
2022-06-21 11:52     ` Abhradeep Chakraborty
2022-06-22 16:49       ` Taylor Blau
2022-06-22 17:18         ` Abhradeep Chakraborty
2022-06-22 21:34           ` Taylor Blau
2022-06-20 12:33 ` [PATCH 3/6] pack-bitmap-write.c: write " Abhradeep Chakraborty via GitGitGadget
2022-06-20 22:16   ` Taylor Blau
2022-06-21 12:50     ` Abhradeep Chakraborty
2022-06-22 16:51       ` Taylor Blau
2022-06-20 12:33 ` [PATCH 4/6] builtin/pack-objects.c: learn pack.writeBitmapLookupTable Taylor Blau via GitGitGadget
2022-06-20 22:18   ` Taylor Blau
2022-06-20 12:33 ` [PATCH 5/6] bitmap-commit-table: add tests for the bitmap lookup table Abhradeep Chakraborty via GitGitGadget
2022-06-22 16:54   ` Taylor Blau
2022-06-20 12:33 ` [PATCH 6/6] bitmap-lookup-table: add performance tests Abhradeep Chakraborty via GitGitGadget
2022-06-22 17:14   ` Taylor Blau
2022-06-26 13:10 ` [PATCH v2 0/6] [GSoC] bitmap: integrate a lookup table extension to the bitmap format Abhradeep Chakraborty via GitGitGadget
2022-06-26 13:10   ` [PATCH v2 1/6] Documentation/technical: describe bitmap lookup table extension Abhradeep Chakraborty via GitGitGadget
2022-06-27 14:18     ` Derrick Stolee
2022-06-27 15:48       ` Taylor Blau
2022-06-27 16:51       ` Abhradeep Chakraborty
2022-06-26 13:10   ` [PATCH v2 2/6] pack-bitmap-write.c: write " Abhradeep Chakraborty via GitGitGadget
2022-06-27 14:35     ` Derrick Stolee
2022-06-27 16:12       ` Taylor Blau
2022-06-27 17:10       ` Abhradeep Chakraborty
2022-06-27 16:05     ` Taylor Blau
2022-06-27 18:29       ` Abhradeep Chakraborty
2022-06-26 13:10   ` [PATCH v2 3/6] pack-bitmap-write: learn pack.writeBitmapLookupTable and add tests Abhradeep Chakraborty via GitGitGadget
2022-06-27 14:43     ` Derrick Stolee
2022-06-27 17:42       ` Abhradeep Chakraborty
2022-06-27 17:49         ` Taylor Blau
2022-06-27 17:47     ` Taylor Blau
2022-06-27 18:39       ` Abhradeep Chakraborty
2022-06-29 20:11         ` Taylor Blau
2022-06-26 13:10   ` [PATCH v2 4/6] pack-bitmap: prepare to read lookup table extension Abhradeep Chakraborty via GitGitGadget
2022-06-27 15:12     ` Derrick Stolee
2022-06-27 18:06       ` Abhradeep Chakraborty [this message]
2022-06-27 18:32         ` [PATCH v2 4/6] pack-bitmap: prepare to read lookup table Derrick Stolee
2022-06-27 21:49       ` [PATCH v2 4/6] pack-bitmap: prepare to read lookup table extension Taylor Blau
2022-06-28  8:59         ` [PATCH v2 4/6] pack-bitmap: prepare to read lookup table Abhradeep Chakraborty
2022-06-29 20:22           ` Taylor Blau
2022-06-30  6:58             ` [PATCH v2 4/6] pack-bitmap: prepare to read lookup table extension Abhradeep Chakraborty
2022-06-27 21:38     ` Taylor Blau
2022-06-28 19:25       ` Abhradeep Chakraborty
2022-06-29 20:37         ` Taylor Blau
2022-06-29 20:41           ` Taylor Blau
2022-06-30  8:35           ` Abhradeep Chakraborty
2022-06-26 13:10   ` [PATCH v2 5/6] bitmap-lookup-table: add performance tests for lookup table Abhradeep Chakraborty via GitGitGadget
2022-06-27 21:53     ` Taylor Blau
2022-06-28  7:58       ` Abhradeep Chakraborty
2022-06-29 20:40         ` Taylor Blau
2022-06-26 13:10   ` [PATCH v2 6/6] p5310-pack-bitmaps.sh: enable pack.writeReverseIndex for testing Abhradeep Chakraborty via GitGitGadget
2022-06-27 21:50     ` Taylor Blau
2022-06-28  8:01       ` Abhradeep Chakraborty
2022-07-04  8:46   ` [PATCH v3 0/6] [GSoC] bitmap: integrate a lookup table extension to the bitmap format Abhradeep Chakraborty via GitGitGadget
2022-07-04  8:46     ` [PATCH v3 1/6] Documentation/technical: describe bitmap lookup table extension Abhradeep Chakraborty via GitGitGadget
2022-07-08 16:38       ` Philip Oakley
2022-07-09  7:53         ` Abhradeep Chakraborty
2022-07-10 15:01           ` Philip Oakley
2022-07-14 23:15             ` Taylor Blau
2022-07-15 10:36               ` Philip Oakley
2022-07-15 18:48             ` Abhradeep Chakraborty
2022-07-04  8:46     ` [PATCH v3 2/6] pack-bitmap-write.c: write " Abhradeep Chakraborty via GitGitGadget
2022-07-14 23:26       ` Taylor Blau
2022-07-15  2:22       ` Taylor Blau
2022-07-15 15:58         ` Abhradeep Chakraborty
2022-07-15 22:15           ` Taylor Blau
2022-07-16 11:50             ` Abhradeep Chakraborty
2022-07-26  0:34               ` Taylor Blau
2022-07-18  8:59       ` Martin Ågren
2022-07-04  8:46     ` [PATCH v3 3/6] pack-bitmap-write: learn pack.writeBitmapLookupTable and add tests Abhradeep Chakraborty via GitGitGadget
2022-07-04  8:46     ` [PATCH v3 4/6] pack-bitmap: prepare to read lookup table extension Abhradeep Chakraborty via GitGitGadget
2022-07-15  2:46       ` Taylor Blau
2022-07-15 16:38         ` Abhradeep Chakraborty
2022-07-15 22:20           ` Taylor Blau
2022-07-18  9:06             ` Martin Ågren
2022-07-18 19:25               ` Abhradeep Chakraborty
2022-07-18 23:26                 ` Martin Ågren
2022-07-26  0:45               ` Taylor Blau
2022-07-04  8:46     ` [PATCH v3 5/6] bitmap-lookup-table: add performance tests for lookup table Abhradeep Chakraborty via GitGitGadget
2022-07-15  2:53       ` Taylor Blau
2022-07-15 18:23         ` Abhradeep Chakraborty
2022-07-04  8:46     ` [PATCH v3 6/6] p5310-pack-bitmaps.sh: remove pack.writeReverseIndex Abhradeep Chakraborty via GitGitGadget
2022-07-04 16:35     ` [PATCH v3 0/6] [GSoC] bitmap: integrate a lookup table extension to the bitmap format Abhradeep Chakraborty
2022-07-06 19:21     ` Junio C Hamano
2022-07-07  8:48       ` Abhradeep Chakraborty
2022-07-07 18:09         ` Kaartic Sivaraam
2022-07-07 18:42           ` Abhradeep Chakraborty
2022-07-20 14:05     ` [PATCH v4 " Abhradeep Chakraborty via GitGitGadget
2022-07-20 14:05       ` [PATCH v4 1/6] Documentation/technical: describe bitmap lookup table extension Abhradeep Chakraborty via GitGitGadget
2022-07-20 14:05       ` [PATCH v4 2/6] pack-bitmap-write.c: write " Abhradeep Chakraborty via GitGitGadget
2022-07-20 14:05       ` [PATCH v4 3/6] pack-bitmap-write: learn pack.writeBitmapLookupTable and add tests Abhradeep Chakraborty via GitGitGadget
2022-07-20 14:05       ` [PATCH v4 4/6] pack-bitmap: prepare to read lookup table extension Abhradeep Chakraborty via GitGitGadget
2022-07-20 14:05       ` [PATCH v4 5/6] p5310-pack-bitmaps.sh: enable `pack.writeReverseIndex` Abhradeep Chakraborty via GitGitGadget
2022-07-20 14:05       ` [PATCH v4 6/6] bitmap-lookup-table: add performance tests for lookup table Abhradeep Chakraborty via GitGitGadget
2022-07-20 18:38       ` [PATCH v5 0/6] [GSoC] bitmap: integrate a lookup table extension to the bitmap format Abhradeep Chakraborty via GitGitGadget
2022-07-20 18:38         ` [PATCH v5 1/6] Documentation/technical: describe bitmap lookup table extension Abhradeep Chakraborty via GitGitGadget
2022-07-20 18:38         ` [PATCH v5 2/6] pack-bitmap-write.c: write " Abhradeep Chakraborty via GitGitGadget
2022-07-26  0:52           ` Taylor Blau
2022-07-26 18:22             ` Abhradeep Chakraborty
2022-07-20 18:38         ` [PATCH v5 3/6] pack-bitmap-write: learn pack.writeBitmapLookupTable and add tests Abhradeep Chakraborty via GitGitGadget
2022-07-28 19:22           ` Johannes Schindelin
2022-08-02 12:40             ` Abhradeep Chakraborty
2022-08-02 15:35               ` Johannes Schindelin
2022-08-02 17:44                 ` Abhradeep Chakraborty
2022-08-08 13:06                   ` Johannes Schindelin
2022-08-08 13:58                     ` Abhradeep Chakraborty
2022-08-09  9:03                       ` Johannes Schindelin
2022-08-09 12:03                         ` Abhradeep Chakraborty
2022-08-09 12:07                           ` Abhradeep Chakraborty
2022-08-10  9:09                           ` Johannes Schindelin
2022-08-10  9:20                             ` Johannes Schindelin
2022-08-10 10:04                               ` Abhradeep Chakraborty
2022-08-10 17:51                                 ` Derrick Stolee
2022-08-12 18:51                                   ` Abhradeep Chakraborty
2022-08-12 19:22                                     ` Derrick Stolee
2022-08-13 10:59                                       ` Abhradeep Chakraborty
2022-08-16 21:57                                         ` Taylor Blau
2022-08-17 10:02                                           ` Abhradeep Chakraborty
2022-08-17 20:38                                             ` Taylor Blau
2022-08-19 21:49                                               ` Taylor Blau
2022-08-13 11:05                               ` Abhradeep Chakraborty
2022-08-16 18:47                             ` Taylor Blau
2022-07-20 18:38         ` [PATCH v5 4/6] pack-bitmap: prepare to read lookup table extension Abhradeep Chakraborty via GitGitGadget
2022-07-26  1:13           ` Taylor Blau
2022-07-26 18:56             ` Abhradeep Chakraborty
2022-07-26 19:36             ` Eric Sunshine
2022-07-20 18:38         ` [PATCH v5 5/6] p5310-pack-bitmaps.sh: enable `pack.writeReverseIndex` Abhradeep Chakraborty via GitGitGadget
2022-07-26  1:18           ` Taylor Blau
2022-07-26  7:15             ` Ævar Arnfjörð Bjarmason
2022-07-26 13:32               ` Derrick Stolee
2022-07-26 13:54                 ` Ævar Arnfjörð Bjarmason
2022-07-26 18:17                   ` Abhradeep Chakraborty
2022-07-20 18:38         ` [PATCH v5 6/6] bitmap-lookup-table: add performance tests for lookup table Abhradeep Chakraborty via GitGitGadget
2022-08-14 16:55         ` [PATCH v6 0/6] [GSoC] bitmap: integrate a lookup table extension to the bitmap format Abhradeep Chakraborty via GitGitGadget
2022-08-14 16:55           ` [PATCH v6 1/6] Documentation/technical: describe bitmap lookup table extension Abhradeep Chakraborty via GitGitGadget
2022-08-14 16:55           ` [PATCH v6 2/6] bitmap: move `get commit positions` code to `bitmap_writer_finish` Abhradeep Chakraborty via GitGitGadget
2022-08-14 16:55           ` [PATCH v6 3/6] pack-bitmap-write.c: write lookup table extension Abhradeep Chakraborty via GitGitGadget
2022-08-14 16:55           ` [PATCH v6 4/6] pack-bitmap-write: learn pack.writeBitmapLookupTable and add tests Abhradeep Chakraborty via GitGitGadget
2022-08-14 16:55           ` [PATCH v6 5/6] pack-bitmap: prepare to read lookup table extension Abhradeep Chakraborty via GitGitGadget
2022-08-14 16:55           ` [PATCH v6 6/6] bitmap-lookup-table: add performance tests for lookup table Abhradeep Chakraborty via GitGitGadget
2022-08-19 21:21           ` [PATCH v6 0/6] [GSoC] bitmap: integrate a lookup table extension to the bitmap format Junio C Hamano
2022-08-22 14:42             ` Johannes Schindelin
2022-08-22 14:48               ` Taylor Blau
2022-08-25 22:16           ` Taylor Blau
2022-08-26 16:02             ` Junio C Hamano

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