[PATCH v2 2/2] perf/aggregate: add --sort-by=regression option

From: Christian Couder <christian.couder@gmail.com>
Date: Mar 26, 2018, 07:24 UTC
Message-ID: <20180326072431.30771-3-chriscool@tuxfamily.org>
In-Reply-To: <20180326072431.30771-1-chriscool@tuxfamily.org>

One of the most interesting thing one can be interested in when looking at performance test results is possible performance regressions.

This new option makes it easy to spot such possible regressions.

This new option is named '--sort-by=regression' to make it possible and easy to add other ways to sort the results, like for example '--sort-by=utime'.

If we would like to sort according to how much the stime regressed we could also add a new option called '--sort-by=regression:stime'. Then '--sort-by=regression' could become a synonym for '--sort-by=regression:rtime'.

Signed-off-by: Christian Couder <chriscool@tuxfamily.org>
---
 t/perf/aggregate.perl | 59 ++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 58 insertions(+), 1 deletion(-)

diff --git a/t/perf/aggregate.perl b/t/perf/aggregate.perl
index 890d85fa7b..48637ef64b 100755
--- a/t/perf/aggregate.perl
+++ b/t/perf/aggregate.perl
@@ -37,7 +37,7 @@ sub format_times {
 }
 
 my (@dirs, %dirnames, %dirabbrevs, %prefixes, @tests,
-    $codespeed, $subsection, $reponame);
+    $codespeed, $sortby, $subsection, $reponame);
 while (scalar @ARGV) {
 	my $arg = $ARGV[0];
 	my $dir;
@@ -46,6 +46,18 @@ while (scalar @ARGV) {
 		shift @ARGV;
 		next;
 	}
+	if ($arg =~ /--sort-by(?:=(.*))?/) {
+		shift @ARGV;
+		if (defined $1) {
+			$sortby = $1;
+		} else {
+			$sortby = shift @ARGV;
+			if (! defined $sortby) {
+				die "'--sort-by' requires an argument";
+			}
+		}
+		next;
+	}
 	if ($arg eq "--subsection") {
 		shift @ARGV;
 		$subsection = $ARGV[0];
@@ -209,6 +221,49 @@ sub print_default_results {
 	}
 }
 
+sub print_sorted_results {
+	my ($sortby) = @_;
+
+	if ($sortby ne "regression") {
+		die "only 'regression' is supported as '--sort-by' argument";
+	}
+
+	my @evolutions;
+	for my $t (@subtests) {
+		my ($prevr, $prevu, $prevs, $prevrev);
+		for my $i (0..$#dirs) {
+			my $d = $dirs[$i];
+			my ($r, $u, $s) = get_times("$resultsdir/$prefixes{$d}$t.times");
+			if ($i > 0 and defined $r and defined $prevr and $prevr > 0) {
+				my $percent = 100.0 * ($r - $prevr) / $prevr;
+				push @evolutions, { "percent"  => $percent,
+						    "test"     => $t,
+						    "prevrev"  => $prevrev,
+						    "rev"      => $d,
+						    "prevr"    => $prevr,
+						    "r"        => $r,
+						    "prevu"    => $prevu,
+						    "u"        => $u,
+						    "prevs"    => $prevs,
+						    "s"        => $s};
+			}
+			($prevr, $prevu, $prevs, $prevrev) = ($r, $u, $s, $d);
+		}
+	}
+
+	my @sorted_evolutions = sort { $b->{percent} <=> $a->{percent} } @evolutions;
+
+	for my $e (@sorted_evolutions) {
+		printf "%+.1f%%", $e->{percent};
+		print " " . $e->{test};
+		print " " . format_times($e->{prevr}, $e->{prevu}, $e->{prevs});
+		print " " . format_times($e->{r}, $e->{u}, $e->{s});
+		print " " . display_dir($e->{prevrev});
+		print " " . display_dir($e->{rev});
+		print "\n";
+	}
+}
+
 sub print_codespeed_results {
 	my ($subsection) = @_;
 
@@ -263,6 +318,8 @@ binmode STDOUT, ":utf8" or die "PANIC on binmode: $!";
 
 if ($codespeed) {
 	print_codespeed_results($subsection);
+} elsif (defined $sortby) {
+	print_sorted_results($sortby);
 } else {
 	print_default_results();
 }

-- 
2.17.0.rc1.36.g098d832c9.dirty