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commit-graph write: add itermediate progress 

Add progress output to sections of code between "Annotating[...]" and
"Computing[...]generation numbers". This can collectively take 5-10
seconds on a large enough repository.

On a test repository with I have with ~7 million commits and ~50
million objects we'll now emit:

    $ ~/g/git/git --exec-path=$HOME/g/git commit-graph write
    Finding commits for commit graph among packed objects: 100% (124763727/124763727), done.
    Loading known commits in commit graph: 100% (18989461/18989461), done.
    Expanding reachable commits in commit graph: 100% (18989507/18989461), done.
    Clearing commit marks in commit graph: 100% (18989507/18989507), done.
    Counting distinct commits in commit graph: 100% (18989507/18989507), done.
    Finding extra edges in commit graph: 100% (18989507/18989507), done.
    Computing commit graph generation numbers: 100% (7250302/7250302), done.
    Writing out commit graph in 4 passes: 100% (29001208/29001208), done.

Whereas on a medium-sized repository such as linux.git these new
progress bars won't have time to kick in and as before and we'll still
emit output like:

    $ ~/g/git/git --exec-path=$HOME/g/git commit-graph write
    Finding commits for commit graph among packed objects: 100% (6529159/6529159), done.
    Expanding reachable commits in commit graph: 815990, done.
    Computing commit graph generation numbers: 100% (815983/815983), done.
    Writing out commit graph in 4 passes: 100% (3263932/3263932), done.

The "Counting distinct commits in commit graph" phase will spend most
of its time paused at "0/*" as we QSORT(...) the list. That's not
optimal, but at least we don't seem to be stalling anymore most of the
time.

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Ævar Arnfjörð Bjarmason 2019-01-19 21:21:20 +01:00 committed by Junio C Hamano
parent e59c615e3c
commit 890226ccb5
1 changed files with 13 additions and 0 deletions
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13
commit-graph.c
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@ -895,12 +895,19 @@ void write_commit_graph(const char *obj_dir,
close_reachable(&oids, report_progress);
if (report_progress)
progress = start_delayed_progress(
_("Counting distinct commits in commit graph"),
oids.nr);
display_progress(progress, 0); /* TODO: Measure QSORT() progress */
QSORT(oids.list, oids.nr, commit_compare);
count_distinct = 1;
for (i = 1; i < oids.nr; i++) {
display_progress(progress, i + 1);
if (!oideq(&oids.list[i - 1], &oids.list[i]))
count_distinct++;
}
stop_progress(&progress);
if (count_distinct >= GRAPH_PARENT_MISSING)
die(_("the commit graph format cannot write %d commits"), count_distinct);
@ -910,8 +917,13 @@ void write_commit_graph(const char *obj_dir,
ALLOC_ARRAY(commits.list, commits.alloc);
num_extra_edges = 0;
if (report_progress)
progress = start_delayed_progress(
_("Finding extra edges in commit graph"),
oids.nr);
for (i = 0; i < oids.nr; i++) {
int num_parents = 0;
display_progress(progress, i + 1);
if (i > 0 && oideq(&oids.list[i - 1], &oids.list[i]))
continue;
@ -928,6 +940,7 @@ void write_commit_graph(const char *obj_dir,
commits.nr++;
}
num_chunks = num_extra_edges ? 4 : 3;
stop_progress(&progress);
if (commits.nr >= GRAPH_PARENT_MISSING)
die(_("too many commits to write graph"));