Shuqi Liang wrote: > Remove full index requirement for `git diff-files` > and test to ensure the index is not expanded in `git diff-files`. > > The `p2000` tests demonstrate a ~96% execution time reduction for 'git > diff-files' and a ~97% execution time reduction for 'git diff-files' > for a file using a sparse index: > > Test before after > ----------------------------------------------------------------- > 2000.78: git diff-files (full-v3) 0.09 0.08 -11.1% > 2000.79: git diff-files (full-v4) 0.09 0.09 +0.0% > 2000.80: git diff-files (sparse-v3) 0.52 0.02 -96.2% > 2000.81: git diff-files (sparse-v4) 0.51 0.02 -96.1% > 2000.82: git diff-files f2/f4/a (full-v3) 0.06 0.07 +16.7% > 2000.83: git diff-files f2/f4/a (full-v4) 0.08 0.08 +0.0% > 2000.84: git diff-files f2/f4/a (sparse-v3) 0.46 0.01 -97.8% > 2000.85: git diff-files f2/f4/a (sparse-v4) 0.51 0.02 -96.1% These are great performance results! > > Signed-off-by: Shuqi Liang <cheskaqiqi@xxxxxxxxx> > --- > builtin/diff-files.c | 4 ++++ > t/perf/p2000-sparse-operations.sh | 2 ++ > t/t1092-sparse-checkout-compatibility.sh | 13 +++++++++++++ > 3 files changed, 19 insertions(+) > > diff --git a/builtin/diff-files.c b/builtin/diff-files.c > index dc991f753b..360464e6ef 100644 > --- a/builtin/diff-files.c > +++ b/builtin/diff-files.c > @@ -27,6 +27,10 @@ int cmd_diff_files(int argc, const char **argv, const char *prefix) > usage(diff_files_usage); > > git_config(git_diff_basic_config, NULL); /* no "diff" UI options */ > + > + prepare_repo_settings(the_repository); > + the_repository->settings.command_requires_full_index = 0; Looks good. > + > repo_init_revisions(the_repository, &rev, prefix); > rev.abbrev = 0; > > diff --git a/t/perf/p2000-sparse-operations.sh b/t/perf/p2000-sparse-operations.sh > index 3242cfe91a..82751f2ca3 100755 > --- a/t/perf/p2000-sparse-operations.sh > +++ b/t/perf/p2000-sparse-operations.sh > @@ -125,5 +125,7 @@ test_perf_on_all git checkout-index -f --all > test_perf_on_all git update-index --add --remove $SPARSE_CONE/a > test_perf_on_all "git rm -f $SPARSE_CONE/a && git checkout HEAD -- $SPARSE_CONE/a" > test_perf_on_all git grep --cached --sparse bogus -- "f2/f1/f1/*" > +test_perf_on_all git diff-files > +test_perf_on_all git diff-files $SPARSE_CONE/a > > test_done > diff --git a/t/t1092-sparse-checkout-compatibility.sh b/t/t1092-sparse-checkout-compatibility.sh > index 9b71d7f5f9..4f582164a3 100755 > --- a/t/t1092-sparse-checkout-compatibility.sh > +++ b/t/t1092-sparse-checkout-compatibility.sh > @@ -2103,4 +2103,17 @@ test_expect_success 'diff-files with pathspec outside sparse definition' ' > test_cmp expect sparse-checkout-out > ' > > +test_expect_success 'sparse index is not expanded: diff-files' ' > + init_repos && > + > + write_script edit-contents <<-\EOF && > + echo text >>"$1" > + EOF > + > + run_on_all ../edit-contents deep/a && > + > + ensure_not_expanded diff-files && > + ensure_not_expanded diff-files deep/a IIRC, in many cases, the internal diff machinery won't expand a sparse index even if the pathspec matches files outside the sparse-checkout definition. Does 'ensure_not_expanded diff-files folder1/a' work? What about 'ensure_not_expanded diff-files "*a"'? > +' > + > test_done
