Subject: Re: [PATCH] commit-graph: split up close_reachable() progress output

From: SZEDER Gábor <[email-masked]>
Date: Mon, 19 Nov 2018 23:57:20 +0100

On Mon, Nov 19, 2018 at 08:23:00PM +0000, Ævar Arnfjörð Bjarmason wrote:
> Amend the progress output added in 7b0f229222 ("commit-graph write:
> add progress output", 2018-09-17) so that the total numbers it reports
> aren't higher than the total number of commits anymore. See [1] for a
> bug report pointing that out.

Please make the commit message more self-contained, i.e. describe the
issue this patch fixes in more detail, so readers won't have to follow
links to understand the problem.

> When I added this I wasn't intending to provide an accurate count, but
> just have some progress output to show the user the command wasn't
> hanging[2]. But since we are showing numbers, let's make them
> accurate. The progress descriptions were suggested by Derrick Stolee
> in [3].
> 
> As noted in [2] we are unlikely to show anything except the "Expanding
> reachable..." message even on fairly large repositories such as
> linux.git. On a test repository I have with north of 7 million commits
> all of these are displayed. Two of them don't show up for long, but as
> noted in [5] future-proofing this for if the loops become more
> expensive in the future makes sense.

In my opinion this is rather one of those "we'll cross that bridge
when (or if ever) we get there" situations.

> 1. https://public-inbox.org/git/[email-masked]/
> 2. https://public-inbox.org/git/[email-masked]/
> 3. https://public-inbox.org/git/[email-masked]/
> 4. https://public-inbox.org/git/[email-masked]/
> 5. https://public-inbox.org/git/[email-masked]/
> 
> Reported-by: SZEDER Gábor <[email-masked]>
> Helped-by: Derrick Stolee <[email-masked]>
> Signed-off-by: Ævar Arnfjörð Bjarmason <[email-masked]>
> ---
> 
> On Mon, Nov 19 2018, SZEDER Gábor wrote:
> 
> > Ping?
> >
> > We are at -rc0, this progress output is a new feature since v2.19.0,
> > and the numbers shown are still way off.
> 
> I was under the impression after your
> https://public-inbox.org/git/[email-masked]/ that
> you were going to do some more digging & report back, so I put it on
> my "waiting for feedback" list and then forgot about it.

No, after I managed to "get my numbers straight" I sent another bug
report in

  https://public-inbox.org/git/[email-masked]/

but as a reply to your original patch.  Sorry about the confusion.

> But here's a patch that should address the issue you pointed out, but
> I don't know if it fixes whatever you were alluding to in the linked
> E-Mail above.

I'm afraid this patch doesn't address that issue, as it's limited to
close_reachable(), and that issue is related to the progress output in
add_packed_commits().

>  commit-graph.c | 13 ++++++++++---
>  1 file changed, 10 insertions(+), 3 deletions(-)
> 
> diff --git a/commit-graph.c b/commit-graph.c
> index 40c855f185..9c0d6914be 100644
> --- a/commit-graph.c
> +++ b/commit-graph.c
> @@ -641,26 +641,29 @@ static void add_missing_parents(struct packed_oid_list *oids, struct commit *com
>  
>  static void close_reachable(struct packed_oid_list *oids, int report_progress)
>  {
> -	int i;
> +	int i, j;
>  	struct commit *commit;
>  	struct progress *progress = NULL;
> -	int j = 0;
>  
>  	if (report_progress)
>  		progress = start_delayed_progress(
> -			_("Annotating commits in commit graph"), 0);
> +			_("Loading known commits in commit graph"), j = 0);
>  	for (i = 0; i < oids->nr; i++) {
>  		display_progress(progress, ++j);
>  		commit = lookup_commit(the_repository, &oids->list[i]);
>  		if (commit)
>  			commit->object.flags |= UNINTERESTING;
>  	}
> +	stop_progress(&progress);
>  
>  	/*
>  	 * As this loop runs, oids->nr may grow, but not more
>  	 * than the number of missing commits in the reachable
>  	 * closure.
>  	 */
> +	if (report_progress)
> +		progress = start_delayed_progress(
> +			_("Expanding reachable commits in commit graph"), j = 0);
>  	for (i = 0; i < oids->nr; i++) {
>  		display_progress(progress, ++j);
>  		commit = lookup_commit(the_repository, &oids->list[i]);
> @@ -668,7 +671,11 @@ static void close_reachable(struct packed_oid_list *oids, int report_progress)
>  		if (commit && !parse_commit(commit))
>  			add_missing_parents(oids, commit);
>  	}
> +	stop_progress(&progress);
>  
> +	if (report_progress)
> +		progress = start_delayed_progress(
> +			_("Clearing commit marks in commit graph"), j = 0);
>  	for (i = 0; i < oids->nr; i++) {
>  		display_progress(progress, ++j);
>  		commit = lookup_commit(the_repository, &oids->list[i]);
> -- 
> 2.19.1.1182.g4ecb1133ce
>