Optimize the startup time of git-send-email by using an amended
config_regexp() function to retrieve the list of config keys and
values we're interested in.
For boolean keys we can handle the [true|false] case ourselves, and
the "--get" case didn't need any parsing. Let's leave "--path" and
other "--bool" cases to "git config". As noted in a preceding commit
we're free to change the config_regexp() function, it's only used by
"git send-email".
This brings the runtime of "git send-email" from ~60-~70ms to a very
steady ~40ms on my test box. We no run just one "git config"
invocation on startup instead of 8, the exact number will differ based
on the local sendemail.* config. I happen to have 8 of those set.
This brings the runtime of t9001-send-email.sh from ~13s down to ~12s
for me. The change there is less impressive as many of those tests set
various config values, and we're also getting to the point of
diminishing returns for optimizing "git send-email" itself.
Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@xxxxxxxxx>
---
git-send-email.perl | 17 ++++++++++-------
perl/Git.pm | 10 +++++-----
2 files changed, 15 insertions(+), 12 deletions(-)
diff --git a/git-send-email.perl b/git-send-email.perl
index 907dc1425f..35ba19470d 100755
--- a/git-send-email.perl
+++ b/git-send-email.perl
@@ -325,7 +325,10 @@ sub read_config {
my $target = $config_bool_settings{$setting};
my $key = "$prefix.$setting";
next unless exists $known_keys->{$key};
- my $v = Git::config_bool(@repo, $key);
+ my $v = (@{$known_keys->{$key}} == 1 &&
+ $known_keys->{$key}->[0] =~ /^(?:true|false)$/s)
+ ? $known_keys->{$key}->[0] eq 'true'
+ : Git::config_bool(@repo, $key);
next unless defined $v;
next if $configured->{$setting}++;
$$target = $v;
@@ -354,14 +357,12 @@ sub read_config {
my $key = "$prefix.$setting";
next unless exists $known_keys->{$key};
if (ref($target) eq "ARRAY") {
- my @values = Git::config(@repo, $key);
- next unless @values;
+ my @values = @{$known_keys->{$key}};
next if $configured->{$setting}++;
@$target = @values;
}
else {
- my $v = Git::config(@repo, $key);
- next unless defined $v;
+ my $v = $known_keys->{$key}->[0];
next if $configured->{$setting}++;
$$target = $v;
}
@@ -372,8 +373,10 @@ sub read_config {
# parses 'bool' etc.) by only doing so for config keys that exist.
my %known_config_keys;
{
- my @known_config_keys = Git::config_regexp("^sende?mail[.]");
- @known_config_keys{@known_config_keys} = ();
+ my @kv = Git::config_regexp("^sende?mail[.]");
+ while (my ($k, $v) = splice @kv, 0, 2) {
+ push @{$known_config_keys{$k}} => $v;
+ }
}
# sendemail.identity yields to --identity. We must parse this
diff --git a/perl/Git.pm b/perl/Git.pm
index f18852fb09..a9020d0d01 100644
--- a/perl/Git.pm
+++ b/perl/Git.pm
@@ -739,18 +739,18 @@ sub config_int {
=item config_regexp ( RE )
Retrieve the list of configuration key names matching the regular
-expression C<RE>. The return value is a list of strings matching
-this regex.
+expression C<RE>. The return value is an ARRAY of key-value pairs.
=cut
sub config_regexp {
my ($self, $regex) = _maybe_self(@_);
try {
- my @cmd = ('config', '--name-only', '--get-regexp', $regex);
+ my @cmd = ('config', '--null', '--get-regexp', $regex);
unshift @cmd, $self if $self;
- my @matches = command(@cmd);
- return @matches;
+ my $data = command(@cmd);
+ my (@kv) = map { split /\n/, $_, 2 } split /\0/, $data;
+ return @kv;
} catch Git::Error::Command with {
my $E = shift;
if ($E->value() == 1) {
--
2.31.1.909.g789bb6d90e
