diff options
Diffstat (limited to 'bm/bm_rebase.pl')
| -rw-r--r-- | bm/bm_rebase.pl | 167 |
1 files changed, 167 insertions, 0 deletions
diff --git a/bm/bm_rebase.pl b/bm/bm_rebase.pl new file mode 100644 index 0000000..3cb0fd5 --- /dev/null +++ b/bm/bm_rebase.pl @@ -0,0 +1,167 @@ +#!/usr/bin/perl +use strict; +use warnings; +use File::Spec; +use File::Path qw(remove_tree); +use File::Find; +use Cwd qw(getcwd abs_path); + +my ($files, $depth, $total_commits, $file_perc, $change_perc) = @ARGV; +if (!defined $files || !defined $depth || !defined $total_commits || !defined $file_perc || !defined $change_perc) { + die "Usage: perl bm_rebase.pl <file_count> <depth> <total_commits> <file_perc> <change_perc>\n"; +} + +my $base_dir = getcwd(); +my $urn_bin = abs_path(File::Spec->catfile("..", "urn")); +my $seed_bin = abs_path("seed.pl"); +my $bm_repo = "bm_repo"; + +my $sample_rate = int($total_commits / 5) || 1; +my %results; +my $initial_repo_size = "0 KB"; + +my $rebase_count = 0; +my %last_base_hashes; + +sub get_size { + my $dir = shift; + return "0 KB" unless -d $dir; + my $size = `du -sk $dir 2>/dev/null`; + $size =~ /^(\d+)/; + return ($1 || 0) . " KB"; +} + +sub count_inodes { + my $dir = shift; + return 0 unless -d $dir; + my $count = `find $dir 2>/dev/null | wc -l`; + $count =~ s/\s+//g; + return $count || 0; +} + +sub track_rebases { + return unless -f ".urn/index"; + open(my $fh, '<', ".urn/index") or return; + while (<$fh>) { + chomp; + my @cols = split(/\t/); + next unless @cols >= 6; + my ($b_hash, $path) = ($cols[2], $cols[5]); + if (exists $last_base_hashes{$path} && $last_base_hashes{$path} ne $b_hash) { + $rebase_count++; + } + $last_base_hashes{$path} = $b_hash; + } + close($fh); +} + +sub run_rebase_benchmark { + my ($tool_name) = @_; + print ">>> Starting REBASE BENCHMARK: $tool_name\n"; + + remove_tree($bm_repo) if -d $bm_repo; + system("perl $seed_bin $files $depth > /dev/null 2>&1"); + + # Capture raw directory size before VCS initialization + if ($initial_repo_size eq "0 KB") { + $initial_repo_size = get_size($bm_repo); + } + + chdir($bm_repo) or die $!; + + my $init_cmd = ($tool_name eq "URN") ? "perl $urn_bin init" : "git init"; + my $add_cmd = ($tool_name eq "URN") ? "perl $urn_bin add ." : "git add ."; + + system("$init_cmd > /dev/null 2>&1"); + system("$add_cmd > /dev/null 2>&1"); + system(($tool_name eq "URN" ? "perl $urn_bin" : "git") . " commit -m 'initial' > /dev/null 2>&1"); + + track_rebases() if $tool_name eq "URN"; + + my @file_list; + find(sub { push @file_list, $File::Find::name if -f $_ && $File::Find::name !~ /\.(git|urn)/ }, "."); + + my $num_to_change = int(scalar(@file_list) * ($file_perc / 100)) || 1; + my @target_files = @file_list[0 .. $num_to_change - 1]; + + for my $i (1 .. $total_commits) { + for my $target (@target_files) { + open(my $fh, '<', $target) or next; + my @lines = <$fh>; + close($fh); + + my $lines_to_change = int(scalar(@lines) * ($change_perc / 100)) || 1; + splice(@lines, 0, $lines_to_change, "Commit $i: block change\n"); + + if (open(my $out, '>', $target)) { + print $out @lines; + close($out); + } + } + + my $cmd = ($tool_name eq "URN") + ? "perl $urn_bin add . && perl $urn_bin commit -m 'c$i'" + : "git add . && git commit -m 'c$i'"; + + if ($i % $sample_rate == 0 || $i == $total_commits) { + my $stats = `/usr/bin/time -l sh -c "$cmd" 2>&1 > /dev/null`; + my ($real, $rss, $maj, $min) = (0, 0, 0, 0); + if ($stats =~ /(\d+\.\d+)\s+real/) { $real = $1; } + if ($stats =~ /(\d+)\s+maximum resident set size/) { $rss = sprintf("%.2f MB", $1 / 1024 / 1024); } + if ($stats =~ /(\d+)\s+page reclaims/) { $min = $1; } + if ($stats =~ /(\d+)\s+page faults/) { $maj = $1; } + + if ($tool_name eq "URN") { track_rebases(); } + + my $meta = ($tool_name eq "URN") ? ".urn" : ".git"; + $results{$i}{$tool_name} = { + real => $real . "s", + rss => $rss, + faults => "Maj:$maj / Min:$min", + inodes => count_inodes($meta), + size => get_size($meta), + }; + print " [Commit $i] $tool_name sampled.\n"; + } else { + system("$cmd > /dev/null 2>&1"); + if ($tool_name eq "URN") { track_rebases(); } + } + } + chdir($base_dir); + remove_tree($bm_repo); +} + +$rebase_count = 0; +%last_base_hashes = (); +run_rebase_benchmark("URN"); +run_rebase_benchmark("GIT"); + +my $out_file = "BM_REBASE_${files}_${total_commits}.txt"; +open(my $res, '>', $out_file) or die $!; +print $res "=============================================================\n"; +print $res " REBASE BENCHMARK: $files files ($total_commits commits)\n"; +print $res " CONDITIONS: Depth=$depth, Files Mod=$file_perc%, Change=$change_perc%\n"; +print $res " INITIAL RAW DATA SIZE: $initial_repo_size\n"; +print $res "=============================================================\n\n"; + +foreach my $i (sort { $a <=> $b } keys %results) { + my $u = $results{$i}{"URN"}; + my $g = $results{$i}{"GIT"}; + print $res "SNAPSHOT: Commit #$i\n"; + print $res "-------------------------------------------------------------\n"; + printf $res "%-15s | %-20s | %-20s\n", "METRIC", "URN", "GIT"; + print $res "----------------+----------------------+---------------------\n"; + printf $res "%-15s | %20s | %20s\n", "Time", $u->{real}, $g->{real}; + printf $res "%-15s | %20s | %20s\n", "Max RSS", $u->{rss}, $g->{rss}; + printf $res "%-15s | %20s | %20s\n", "Page faults", $u->{faults}, $g->{faults}; + printf $res "%-15s | %20s | %20s\n", "Inodes", $u->{inodes}, $g->{inodes}; + printf $res "%-15s | %20s | %20s\n", "Repo size", $u->{size}, $g->{size}; + print $res "-------------------------------------------------------------\n\n"; +} + +print $res "TOTAL URN REBASES: $rebase_count\n"; +close($res); + +my $pager = $ENV{PAGER} || 'less'; +exec $pager, $out_file; + |