212 lines
6.5 KiB
Perl
Executable file
212 lines
6.5 KiB
Perl
Executable file
#!/usr/bin/perl
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#
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# This tool will print vaguely pretty information about a pack. It
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# expects the output of "git verify-pack -v" as input on stdin.
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#
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# $ git verify-pack -v | packinfo.pl
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#
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# This prints some full-pack statistics; currently "all sizes", "all
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# path sizes", "tree sizes", "tree path sizes", and "depths".
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#
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# * "all sizes" stats are across every object size in the file;
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# full sizes for base objects, and delta size for deltas.
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# * "all path sizes" stats are across all object's "path sizes".
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# A path size is the sum of the size of the delta chain, including the
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# base object. In other words, it's how many bytes need be read to
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# reassemble the file from deltas.
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# * "tree sizes" are object sizes grouped into delta trees.
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# * "tree path sizes" are path sizes grouped into delta trees.
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# * "depths" should be obvious.
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#
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# When run as:
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#
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# $ git verify-pack -v | packinfo.pl -tree
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#
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# the trees of objects are output along with the stats. This looks
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# like:
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#
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# 0 commit 031321c6... 803 803
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#
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# 0 blob 03156f21... 1767 1767
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# 1 blob f52a9d7f... 10 1777
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# 2 blob a8cc5739... 51 1828
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# 3 blob 660e90b1... 15 1843
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# 4 blob 0cb8e3bb... 33 1876
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# 2 blob e48607f0... 311 2088
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# size: count 6 total 2187 min 10 max 1767 mean 364.50 median 51 std_dev 635.85
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# path size: count 6 total 11179 min 1767 max 2088 mean 1863.17 median 1843 std_dev 107.26
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#
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# The first number after the sha1 is the object size, the second
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# number is the path size. The statistics are across all objects in
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# the previous delta tree. Obviously they are omitted for trees of
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# one object.
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#
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# When run as:
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#
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# $ git verify-pack -v | packinfo.pl -tree -filenames
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#
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# it adds filenames to the tree. Getting this information is slow:
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#
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# 0 blob 03156f21... 1767 1767 Documentation/git-lost-found.txt @ tags/v1.2.0~142
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# 1 blob f52a9d7f... 10 1777 Documentation/git-lost-found.txt @ tags/v1.5.0-rc1~74
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# 2 blob a8cc5739... 51 1828 Documentation/git-lost+found.txt @ tags/v0.99.9h^0
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# 3 blob 660e90b1... 15 1843 Documentation/git-lost+found.txt @ master~3222^2~2
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# 4 blob 0cb8e3bb... 33 1876 Documentation/git-lost+found.txt @ master~3222^2~3
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# 2 blob e48607f0... 311 2088 Documentation/git-lost-found.txt @ tags/v1.5.2-rc3~4
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# size: count 6 total 2187 min 10 max 1767 mean 364.50 median 51 std_dev 635.85
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# path size: count 6 total 11179 min 1767 max 2088 mean 1863.17 median 1843 std_dev 107.26
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#
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# When run as:
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#
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# $ git verify-pack -v | packinfo.pl -dump
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#
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# it prints out "sha1 size pathsize depth" for each sha1 in lexical
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# order.
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#
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# 000079a2eaef17b7eae70e1f0f635557ea67b644 30 472 7
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# 00013cafe6980411aa6fdd940784917b5ff50f0a 44 1542 4
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# 000182eacf99cde27d5916aa415921924b82972c 499 499 0
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# ...
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#
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# This is handy for comparing two packs. Adding "-filenames" will add
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# filenames, as per "-tree -filenames" above.
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use strict;
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use Getopt::Long;
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my $filenames = 0;
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my $tree = 0;
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my $dump = 0;
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GetOptions("tree" => \$tree,
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"filenames" => \$filenames,
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"dump" => \$dump);
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my %parents;
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my %children;
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my %sizes;
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my @roots;
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my %paths;
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my %types;
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my @commits;
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my %names;
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my %depths;
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my @depths;
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while (<STDIN>) {
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my ($sha1, $type, $size, $space, $offset, $depth, $parent) = split(/\s+/, $_);
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next unless ($sha1 =~ /^[0-9a-f]{40}$/);
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$depths{$sha1} = $depth || 0;
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push(@depths, $depth || 0);
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push(@commits, $sha1) if ($type eq 'commit');
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push(@roots, $sha1) unless $parent;
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$parents{$sha1} = $parent;
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$types{$sha1} = $type;
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push(@{$children{$parent}}, $sha1);
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$sizes{$sha1} = $size;
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}
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if ($filenames && ($tree || $dump)) {
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open(NAMES, "git name-rev --all|");
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while (<NAMES>) {
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if (/^(\S+)\s+(.*)$/) {
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my ($sha1, $name) = ($1, $2);
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$names{$sha1} = $name;
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}
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}
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close NAMES;
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for my $commit (@commits) {
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my $name = $names{$commit};
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open(TREE, "git ls-tree -t -r $commit|");
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print STDERR "Plumbing tree $name\n";
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while (<TREE>) {
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if (/^(\S+)\s+(\S+)\s+(\S+)\s+(.*)$/) {
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my ($mode, $type, $sha1, $path) = ($1, $2, $3, $4);
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$paths{$sha1} = "$path @ $name";
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}
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}
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close TREE;
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}
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}
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sub stats {
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my @data = sort {$a <=> $b} @_;
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my $min = $data[0];
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my $max = $data[$#data];
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my $total = 0;
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my $count = scalar @data;
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for my $datum (@data) {
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$total += $datum;
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}
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my $mean = $total / $count;
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my $median = $data[int(@data / 2)];
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my $diff_sum = 0;
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for my $datum (@data) {
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$diff_sum += ($datum - $mean)**2;
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}
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my $std_dev = sqrt($diff_sum / $count);
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return ($count, $total, $min, $max, $mean, $median, $std_dev);
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}
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sub print_stats {
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my $name = shift;
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my ($count, $total, $min, $max, $mean, $median, $std_dev) = stats(@_);
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printf("%s: count %s total %s min %s max %s mean %.2f median %s std_dev %.2f\n",
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$name, $count, $total, $min, $max, $mean, $median, $std_dev);
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}
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my @sizes;
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my @path_sizes;
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my @all_sizes;
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my @all_path_sizes;
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my %path_sizes;
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sub dig {
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my ($sha1, $depth, $path_size) = @_;
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$path_size += $sizes{$sha1};
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push(@sizes, $sizes{$sha1});
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push(@all_sizes, $sizes{$sha1});
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push(@path_sizes, $path_size);
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push(@all_path_sizes, $path_size);
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$path_sizes{$sha1} = $path_size;
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if ($tree) {
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printf("%3d%s %6s %s %8d %8d %s\n",
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$depth, (" " x $depth), $types{$sha1},
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$sha1, $sizes{$sha1}, $path_size, $paths{$sha1});
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}
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for my $child (@{$children{$sha1}}) {
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dig($child, $depth + 1, $path_size);
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}
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}
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my @tree_sizes;
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my @tree_path_sizes;
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for my $root (@roots) {
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undef @sizes;
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undef @path_sizes;
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dig($root, 0, 0);
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my ($aa, $sz_total) = stats(@sizes);
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my ($bb, $psz_total) = stats(@path_sizes);
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push(@tree_sizes, $sz_total);
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push(@tree_path_sizes, $psz_total);
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if ($tree) {
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if (@sizes > 1) {
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print_stats(" size", @sizes);
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print_stats("path size", @path_sizes);
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}
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print "\n";
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}
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}
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if ($dump) {
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for my $sha1 (sort keys %sizes) {
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print "$sha1 $sizes{$sha1} $path_sizes{$sha1} $depths{$sha1} $paths{$sha1}\n";
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}
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} else {
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print_stats(" all sizes", @all_sizes);
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print_stats(" all path sizes", @all_path_sizes);
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print_stats(" tree sizes", @tree_sizes);
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print_stats("tree path sizes", @tree_path_sizes);
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print_stats(" depths", @depths);
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}
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