From 4b141a8efa9616ef57afaa6d9b4eee2f3cac62cf Mon Sep 17 00:00:00 2001
From: mberends <github@autoexec.demon.nl>
Date: Fri, 18 Sep 2009 14:35:56 +0100
Subject: [PATCH] [tools/test_summary.pl] implement some simple relative
 benchmarking

---
 tools/test_summary.pl | 89 ++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 88 insertions(+), 1 deletion(-)

diff --git a/tools/test_summary.pl b/tools/test_summary.pl
index 3ad3c6dc7ff..a87dabdb8c1 100644
--- a/tools/test_summary.pl
+++ b/tools/test_summary.pl
@@ -16,6 +16,7 @@
 
 use strict;
 use warnings;
+use Time::Local;
 
 # Build the list of test scripts to run in @tfiles
 my $testlist = $ARGV[0] || 't/spectest.data';
@@ -67,6 +68,22 @@
 }
 $syn = ''; # to reliably trigger the display of column headings
 
+# start simple relative benchmarking
+my( %times, @interesting_times );
+if ( open( my $times, '<', 'docs/test_summary.times') ) {
+	while ( <$times> ) {
+	    if (/^(.*),(\d+)-(\d+)-(\d+)\s(\d+):(\d+):(\d+),(.*)/) {
+	        my ( $testname, $year, $mon, $mday, $hour, $min, $sec, $cusertime )
+	            = ( $1, $2, $3, $4, $5, $6, $7, $8 );
+	        my $timegm = timegm( $sec, $min, $hour, $mday, $mon-1, $year-1900 );
+	        $times{$testname} = [ $timegm, $cusertime ];
+	    }
+	}
+	close $times or die $!;
+}
+$times{'test startup'} = [ time, 9999 ]; # ignore test startup from previous runs?
+open( my $times, '>', 'docs/test_summary.times.tmp') or die "cannot create docs/test_summary.times.tmp: $!";
+
 # Execute all test scripts, aggregate the results, display the failures
 $| = 1;
 my ( @fail, @plan_hint );
@@ -94,7 +111,9 @@
     $syn{$syn}++;
     printf "%s%s..", $tname, '.' x ($max - length($tname));
     my $cmd = "./perl6 $tfile";
+    my ($user1,$system1,$cuser1,$csystem1) = times;
     my @results = split "\n", `$cmd`;  # run the test, @result = all stdout
+    my ($user2,$system2,$cuser2,$csystem2) = times;
     my (%skip, %todopass, %todofail);
     for (@results) {
         # pass over the optional line containing "1..$planned"
@@ -150,8 +169,76 @@
     if ($bonus) {
         printf "   %3d tests more than planned were run\n", $bonus;
     }
+    # track simple relative benchmarking
+    {
+        my $cuser = $cuser2 - $cuser1;
+        if ( $cuser < $times{'test startup'}->[1] ) {
+            $times{'test startup'} = [ time, $cuser ];
+        }
+        if ( not exists( $times{$tname} ) ) { $times{$tname} = [ time, $cuser ]; }
+        my $datet_old = $times{$tname}->[0];
+        my $cuser_old = $times{$tname}->[1];
+        my $diff_sec = abs($cuser - $times{$tname}->[1]);
+        if ( $diff_sec >= 0.05 ) {
+            push @interesting_times, [ $tname, $datet_old, $cuser_old, time, $cuser, $diff_sec ];
+            $times{$tname} = [ time, $cuser ];
+        }
+        my ($sec,$min,$hour,$mday,$mon,$year,$wday,$yday,$isdst) = gmtime($times{$tname}->[0]);
+        printf $times "%s,%04d-%02d-%02d %02d:%02d:%02d,%g\n", $tname,
+            $year+1900, $mon+1, $mday, $hour, $min, $sec, $times{$tname}->[1];
+    }
 } # for my $tfile (@tfiles)
 
+# finish simple relative benchmarking
+{
+#   use DateTime;
+    my ($sec,$min,$hour,$mday,$mon,$year,$wday,$yday,$isdst) = gmtime;
+    printf $times "%s,%04d-%02d-%02d %02d:%02d:%02d,%g\n", 'test startup',
+        $year+1900, $mon+1, $mday, $hour, $min, $sec, $times{'test startup'}->[1];
+    close $times or die $!;
+    rename 'docs/test_summary.times.tmp', 'docs/test_summary.times';
+    if ( @interesting_times ) {
+        print "----------------\n";
+        my $test_startup = $times{'test startup'}->[1];
+        print "Minimum test startup ${test_startup}s\n";
+        @interesting_times = map  { $_->[0] }             # Schwartzian Transform
+                             sort { $b->[1] <=> $a->[1] } # descending
+                             map  { [$_, $$_[5]] }        # absolute time difference
+                             @interesting_times;
+        @interesting_times = @interesting_times[0..($#interesting_times>19?19:$#interesting_times)];
+        for my $interesting ( @interesting_times ) {
+            my( $tname, $dt1, $cuser1, $dt2, $cuser2, $diff_sec ) = @$interesting;
+            my $change = $cuser1 < $cuser2 ? 'slower' : 'faster';
+            # The percentage difference is from the previous child user time minus
+            # the presumed startup time. Without a check it can divide by zero.
+            my $diff_pct = 100;
+            if ( $cuser1 != $test_startup ) {
+                $diff_pct = 100 * ($cuser2-$cuser1) / ( $cuser1 - $test_startup );
+            }
+            my $ago = int($dt2 - $dt1);
+            my $unit = 'second'; $unit.='s' if $ago!=1;
+            if ($ago>60) {
+                $ago=int($ago/60); $unit='minute'; $unit.='s' if $ago!=1;
+                if ($ago>60) {
+                    $ago=int($ago/60); $unit='hour'; $unit.='s' if $ago!=1;
+                    if ($ago>24) {
+                        $ago=int($ago/24); $unit='day'; $unit.='s' if $ago!=1;
+                        if ($ago>7) {
+                            $ago=int($ago/7); $unit='week'; $unit.='s' if $ago!=1;
+                        }
+                    }
+                }
+            }
+            printf "%-38s %.2fs %s (%.1f%%) than %d %s ago\n",
+                $tname, $diff_sec, $change, $diff_pct, $ago, $unit;
+#           my $d1 = DateTime->from_epoch( epoch => $dt1 );
+#           my $d2 = DateTime->from_epoch( epoch => $dt2 );
+#           printf "    (%s, %.2f, %s, %.2f)\n", $d1->ymd.' '.$d1->hms,
+#               $cuser1, $d2->ymd.' '.$d2->hms, $cuser2;
+        }
+    }
+}
+
 # Calculate plan totals from test scripts grouped by Synopsis and overall.
 # This ignores any test list and processes all unfudged files in t/spec/.
 # Implementing 'no_plan' or 'plan *' in test scripts would make this
@@ -214,5 +301,5 @@
     }
 }
 else {
-    print "No failures!";
+    print "No failures!\n";
 }