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212 lines
6.5 KiB
212 lines
6.5 KiB
#!/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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