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From: Junio C Hamano <gitster@pobox.com>
To: Derrick Stolee <stolee@gmail.com>
Cc: Taylor Blau <me@ttaylorr.com>,
	Derrick Stolee via GitGitGadget <gitgitgadget@gmail.com>,
	git@vger.kernel.org, jnareb@gmail.com, garimasigit@gmail.com,
	Derrick Stolee <dstolee@microsoft.com>
Subject: Re: [PATCH v2 2/4] commit: write commit-graph with Bloom filters
Date: Tue, 14 Apr 2020 10:26:43 -0700	[thread overview]
Message-ID: <xmqqa73e9dws.fsf@gitster.c.googlers.com> (raw)
In-Reply-To: <74e4e8d6-d401-081d-14cc-c4b6087bdeda@gmail.com> (Derrick Stolee's message of "Tue, 14 Apr 2020 11:04:05 -0400")

Derrick Stolee <stolee@gmail.com> writes:

> On 4/13/2020 6:21 PM, Junio C Hamano wrote:
>> Taylor Blau <me@ttaylorr.com> writes:
>> 
>>> Hmm. I'm not crazy about a library function looking at 'GIT_TEST_*'
>>> environment variables and potentially ignoring its arguments, but given
>>> the discussion we had in v1, I don't feel strongly enough to recommend
>>> that you change this.
>>>
>>> For what it's worth, I think that 'write_commit_graph' could behave more
>>> purely if callers checked 'GIT_TEST_COMMIT_GRAPH_CHANGED_PATHS' and set
>>> 'flags' appropriately from the outside,...
>> 
>> Yeah, I agree that it would be a lot cleaner if that is easy to
>> arrange.  I have a suspicion that Derrick already tried and the
>> resulting code looked messier and was discarded?
>
> Perhaps I could fix both concerns by
>
> 1. Use a macro instead of a library call.
>
> 2. Check the _CHANGED_PATHS variable in the macro.

I am not sure how use of a macro "fixes" purity, though.  And what
is the other concern?

How widely would this "if we are testing, write out the graph file"
call be sprinkled over the codebase?  I am hoping that it won't be
"everywhere", but only at strategic places (like "just once before
we leave a subcommand that creates one or bunch of commits").  And
how often would they be called?  I am also hoping that it won't be
"inside a tight loop".  In short, I am wondering if we can promise
our codebase that 

 - git_test_write_commit_graph_or_die() calls won't be an eyesore
   (and/or distraction) for developers too much.

 - git_env_bool() call won't have performance impact.


> The macro would look like this:
>
>
> #define git_test_write_commit_graph_or_die() \
> 	if (git_env_bool(GIT_TEST_COMMIT_GRAPH, 0)) { \
> 		int flags = 0; \
> 		if (git_env_bool(GIT_TEST_COMMIT_GRAPH_CHANGED_PATHS, 0)) \
> 			flags = COMMIT_GRAPH_WRITE_BLOOM_FILTERS; \
> 		if (write_commit_graph_reachable( \
> 			the_repository->objects->odb, flags, NULL)) \
> 			die("failed to write commit-graph under GIT_TEST_COMMIT_GRAPH"); \
> 	}
>
> Thanks,
> -Stolee

  reply	other threads:[~2020-04-14 17:26 UTC|newest]

Thread overview: 48+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-04-11  1:02 [PATCH 0/3] Integrate changed-path Bloom filters with 'git blame' Derrick Stolee via GitGitGadget
2020-04-11  1:02 ` [PATCH 1/3] revision: complicated pathspecs disable filters Derrick Stolee via GitGitGadget
2020-04-11 21:40   ` Junio C Hamano
2020-04-13 11:49     ` Derrick Stolee
2020-04-14 18:25       ` Junio C Hamano
2020-04-15 13:27         ` Derrick Stolee
2020-04-15 18:37           ` Derrick Stolee
2020-04-15 19:32             ` Junio C Hamano
2020-04-15 19:39               ` Junio C Hamano
2020-04-15 21:25             ` Junio C Hamano
2020-04-16  0:56               ` Taylor Blau
2020-04-15 22:18             ` Jakub Narębski
2020-04-16  0:52               ` Taylor Blau
2020-04-16 13:26                 ` Derrick Stolee
2020-04-16 16:33                   ` Taylor Blau
2020-04-16 18:02                     ` Junio C Hamano
2020-04-12 22:22   ` Taylor Blau
2020-04-12 22:30     ` Junio C Hamano
2020-04-13  0:07       ` Taylor Blau
2020-04-13 11:54         ` Derrick Stolee
2020-04-11  1:03 ` [PATCH 2/3] commit: write commit-graph with bloom filters Derrick Stolee via GitGitGadget
2020-04-11 21:57   ` Junio C Hamano
2020-04-12 20:51     ` Taylor Blau
2020-04-13 12:08       ` Derrick Stolee
2020-04-13 22:11         ` Junio C Hamano
2020-04-11  1:03 ` [PATCH 3/3] blame: use changed-path Bloom filters Derrick Stolee via GitGitGadget
2020-04-11 22:03   ` Junio C Hamano
2020-04-12  7:39     ` Eric Sunshine
2020-04-11 21:30 ` [PATCH 0/3] Integrate changed-path Bloom filters with 'git blame' Junio C Hamano
2020-04-13 14:45 ` [PATCH v2 0/4] " Derrick Stolee via GitGitGadget
2020-04-13 14:45   ` [PATCH v2 1/4] revision: complicated pathspecs disable filters Derrick Stolee via GitGitGadget
2020-04-13 16:09     ` Taylor Blau
2020-04-13 22:18       ` Junio C Hamano
2020-04-13 14:45   ` [PATCH v2 2/4] commit: write commit-graph with Bloom filters Derrick Stolee via GitGitGadget
2020-04-13 16:12     ` Taylor Blau
2020-04-13 22:21       ` Junio C Hamano
2020-04-14 15:04         ` Derrick Stolee
2020-04-14 17:26           ` Junio C Hamano [this message]
2020-04-14 17:40             ` Derrick Stolee
2020-04-15  0:17               ` Taylor Blau
2020-04-13 14:45   ` [PATCH v2 3/4] commit-graph: write commit-graph in more tests Derrick Stolee via GitGitGadget
2020-04-13 14:45   ` [PATCH v2 4/4] blame: use changed-path Bloom filters Derrick Stolee via GitGitGadget
2020-04-13 16:21   ` [PATCH v2 0/4] Integrate changed-path Bloom filters with 'git blame' Taylor Blau
2020-04-16 20:14   ` [PATCH v3 0/3] " Derrick Stolee via GitGitGadget
2020-04-16 20:14     ` [PATCH v3 1/3] revision: complicated pathspecs disable filters Derrick Stolee via GitGitGadget
2020-06-07 20:33       ` SZEDER Gábor
2020-04-16 20:14     ` [PATCH v3 2/3] tests: write commit-graph with Bloom filters Derrick Stolee via GitGitGadget
2020-04-16 20:14     ` [PATCH v3 3/3] blame: use changed-path " Derrick Stolee via GitGitGadget

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