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package Devel::NYTProf::Callgrind::TicksDiff; # Calculates a delta between 2 callgrind files |
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use v5.10; |
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use strict; |
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use warnings; |
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use Devel::NYTProf::Callgrind::Ticks; |
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use Carp; |
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our $VERSION = '0.04'; |
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# If you do a performance analysis with NYTProf over different |
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# computers and want to know what makes the application |
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# slower on the second machine, it might be usefull to |
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# see the difference. |
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# |
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# TicksDiff takes the callgrind files, you can get with |
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# nytprofcg and calculates the delta between 2 files to |
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# a new callgrind file. |
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# |
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# It is nice to open the resulting file with kcachegrind to |
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# see it in a graphical way. |
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# |
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# SYNOPSIS |
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# ======== |
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# |
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# The command line way: |
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# |
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# # Output to STDOUT |
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# callgrind diff fileA.callgrind fileB.callgrind |
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# |
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# # Output to a file |
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# callgrind diff fileA.callgrind fileB.callgrind --out callgrind |
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# |
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# # With normalization (see below) |
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# callgrind diff fileA.callgrind fileB.callgrind --out callgrind --normalize |
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# |
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# |
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# The Perl way: |
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# |
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# use Devel::NYTProf::Callgrind::TicksDiff; |
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# my $tickdiff = Devel::NYTProf::Callgrind::TicksDiff->new( files => [$fileA,$fileB], normalize => 1 ); |
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# print $ticksdiff->getDiffText(); |
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# |
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# |
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# Normalize |
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# ========= |
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# The comand line and the contructor can take the argument 'normalize'. |
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# It will avoid to truncate negative values. |
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# |
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# To understand it, ive got to explain what happens in TicksDiff: |
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# If you have to runs of a perl script (Run A and B) with different amount of ticks. |
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# |
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# A B function |
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# 100 120 foo() |
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# 120 100 bar() |
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# |
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# And you make a diff of it, TicksDiff would assume, you want to know how many ticks MORE the run B needs than A. |
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# The result would be: |
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# |
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# A B diff function |
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# 100 120 20 foo() |
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# 120 100 0 bar() # -20 is the real diff |
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# |
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# The negative values will ne truncated to 0 because it is not possible to have negative ticks |
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# (maybe in a black whole ;-) |
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# |
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# If you dont want that truncation, you can raise the whole level with the biggest negative value. |
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# So the result would be: |
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# |
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# A B normalized diff function |
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# 100 120 40 foo() |
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# 120 100 0 bar() |
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# |
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# |
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# AUTHOR |
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# ====== |
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# Andreas Hernitscheck - ahernit AT cpan.org |
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# |
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# LICENCE |
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# ======= |
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# You can redistribute it and/or modify it under the conditions of |
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# LGPL and Artistic Licence. |
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use Moose; |
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# callgrind files to be compared |
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has 'files' => ( |
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is => 'rw', |
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isa => 'ArrayRef', |
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required => 1, |
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default => sub {[]}, |
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); |
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has 'file_out' => ( |
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is => 'rw', |
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isa => 'ArrayRef', |
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default => sub {[]}, |
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); |
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# Objects of ticks Devel::NYTProf::Callgrind::TicksD |
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has 'ticks_objects' => ( |
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is => 'rw', |
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isa => 'ArrayRef', |
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builder => '_loadFiles', |
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); |
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has 'ticks_object_out' => ( |
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is => 'rw', |
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default => undef, |
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); |
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# enable normalization |
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has 'normalize' => ( |
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is => 'rw', |
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isa => 'Bool', |
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default => 0, |
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); |
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# if negative ticks are allowed or be truncated to 0 |
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has 'allow_negative' => ( |
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is => 'rw', |
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isa => 'Bool', |
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default => 0, |
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); |
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sub _loadFiles{ |
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my $self = shift; |
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my $reffiles = $self->files() or croak("files must be set"); |
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my @files = @{ $reffiles }; |
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my @objs; |
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foreach my $file (@files){ |
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my $ticks = Devel::NYTProf::Callgrind::Ticks->new( file => $file ); |
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push @objs, $ticks; |
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} |
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$self->ticks_objects( \@objs ); |
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return \@objs; # for Moose builder |
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} |
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# starts the compare process. So far it compares only |
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# two files. Returning infos in a hash. |
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sub compare{ # HashRef |
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my $self = shift; |
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my $objs = $self->ticks_objects(); |
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my $result = {}; |
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my $obj_a = $objs->[0]; |
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my $obj_b = $objs->[1]; |
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my $notfound = 0; |
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my $delta_total = 0; |
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my $delta_less = 0; |
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my $delta_more = 0; |
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my $max_less = 0; |
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169
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## remember deltas for new blocks |
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my $deltaInfo = []; |
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foreach my $block_a ( @{ $obj_a->list() } ){ |
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my $block_b = $obj_b->getBlockEquivalent( $block_a ); |
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if ( $block_b ){ |
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my $delta = $self->diffBlocks( $block_a, $block_b ); |
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$delta_total += $delta; |
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if ( $delta > 0 ){ |
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$delta_more += $delta; |
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}else{ |
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$delta_less += $delta; |
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# remember the biggest negative value. |
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# to enable shifting when normalize is on |
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if ( $delta < $max_less ){ |
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$max_less = $delta; |
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} |
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} |
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push @$deltaInfo, { |
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delta => $delta, |
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block_a => $block_a, |
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block_b => $block_b, |
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}; |
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199
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#print $delta."\n"; |
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}else{ |
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$notfound++; |
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} |
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} |
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208
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## build new delta blocks. |
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## iterate over the stored delta info list with |
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## refs to the original blocks |
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213
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## new ticks object to store the delta info in |
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my $nobj = Devel::NYTProf::Callgrind::Ticks->new(); |
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my $norm = $self->normalize(); |
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my $allow_negative = $self->allow_negative(); |
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foreach my $deltaInfo ( @{ $deltaInfo } ){ |
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my $block_a = $deltaInfo->{'block_a'}; |
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221
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## now build a new block |
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my $nblock = {}; |
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%{ $nblock } = %{ $block_a }; # copy the existing block |
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if ( scalar( keys %$nblock ) == 0 ){ next }; # skip empty |
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my $nticks = $deltaInfo->{'delta'}; # using the delta as ticks |
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# normalization? |
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# It will shift up all values by the maximum nagative delta |
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# to have the lowest value as 0. |
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if ( $norm ){ |
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$nticks = $nticks - $max_less; # it is a negative value |
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} |
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## do not allow negative deltas. |
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## to avoid wrong info, you may use normalize |
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if ( ($nticks < 0) && (!$allow_negative)){ |
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$nticks = 0; |
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} |
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$nblock->{'ticks'} = $nticks; |
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# store to the new ticks object |
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$nobj->addBlock( $nblock ); |
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} |
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## save to official location |
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$self->ticks_object_out( $nobj ); |
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$result = { |
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not_found => $notfound, |
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delta_more => $delta_more, |
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delta_less => $delta_less, |
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delta_total => $delta_total, |
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max_less => $max_less, |
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}; |
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return $result; |
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} |
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# Compares two single blocks (HasRefs) provided |
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# by the Ticks class of this package. It returns |
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# the tick difference between B and A. Means |
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# B-Ticks - A-Ticks. |
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sub diffBlocks{ # $ticks ( \%blockA, \%blockB ) |
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1
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my $self = shift; |
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my $blocka = shift or die "block as hashref required"; |
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my $blockb = shift or die "block as hashref required"; |
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my $ta = $blocka->{'ticks'}; |
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my $tb = $blockb->{'ticks'}; |
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return $tb - $ta; |
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} |
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# just a wrapper around ticks_object_out |
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sub getDeltaTicksObject{ # $Object |
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1
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my $self = shift; |
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4
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138
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return $self->ticks_object_out(); |
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} |
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# Saves the difference to a callgrind file |
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sub saveDiffFile{ # void ( $filename ) |
293
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1
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1
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1
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322
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my $self = shift; |
294
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1
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5
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my $file = shift or die "need filename"; |
295
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1
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42
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my $obj = $self->ticks_object_out(); |
297
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1
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4
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$obj->saveFile( $file ); |
298
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299
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1
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18
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if ( ! -f $file ){ die "Did not create file $file" }; |
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0
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300
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301
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} |
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303
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# Returns the callgrind text of the diff. |
304
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sub getDiffText{ # $text |
305
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0
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0
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1
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my $self = shift; |
306
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307
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0
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my $obj = $self->ticks_object_out(); |
308
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0
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return $obj->getAsText(); |
309
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} |
310
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311
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312
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1; |
313
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314
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315
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#################### pod generated by Pod::Autopod - keep this line to make pod updates possible #################### |
316
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317
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=head1 NAME |
318
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319
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Devel::NYTProf::Callgrind::TicksDiff - Calculates a delta between 2 callgrind files |
320
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321
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322
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=head1 SYNOPSIS |
323
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324
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325
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The command line way: |
326
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327
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# Output to STDOUT |
328
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|
callgrind diff fileA.callgrind fileB.callgrind |
329
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330
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# Output to a file |
331
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callgrind diff fileA.callgrind fileB.callgrind --out callgrind |
332
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333
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# With normalization (see below) |
334
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callgrind diff fileA.callgrind fileB.callgrind --out callgrind --normalize |
335
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336
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337
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The Perl way: |
338
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339
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|
use Devel::NYTProf::Callgrind::TicksDiff; |
340
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|
|
my $tickdiff = Devel::NYTProf::Callgrind::TicksDiff->new( files => [$fileA,$fileB], normalize => 1 ); |
341
|
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|
|
print $ticksdiff->getDiffText(); |
342
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343
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344
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345
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346
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|
=head1 DESCRIPTION |
347
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348
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If you do a performance analysis with NYTProf over different |
349
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|
computers and want to know what makes the application |
350
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|
slower on the second machine, it might be usefull to |
351
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see the difference. |
352
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353
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|
TicksDiff takes the callgrind files, you can get with |
354
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|
nytprofcg and calculates the delta between 2 files to |
355
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|
a new callgrind file. |
356
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357
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|
It is nice to open the resulting file with kcachegrind to |
358
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|
see it in a graphical way. |
359
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360
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361
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362
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|
=head1 REQUIRES |
363
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364
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|
L<Devel::NYTProf::Callgrind::TicksDiff> |
365
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366
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L<Moose> |
367
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368
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L<Devel::NYTProf::Callgrind::Ticks> |
369
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370
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371
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|
=head1 METHODS |
372
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373
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374
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|
=head2 compare |
375
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376
|
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|
my \%hashref = $this->compare(); |
377
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378
|
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|
|
starts the compare process. So far it compares only |
379
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two files. Returning infos in a hash. |
380
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381
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382
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|
=head2 diffBlocks |
383
|
|
|
|
|
|
|
|
384
|
|
|
|
|
|
|
my $ticks = $this->diffBlocks(\%blockA, \%blockB); |
385
|
|
|
|
|
|
|
|
386
|
|
|
|
|
|
|
Compares two single blocks (HasRefs) provided |
387
|
|
|
|
|
|
|
by the Ticks class of this package. It returns |
388
|
|
|
|
|
|
|
the tick difference between B and A. Means |
389
|
|
|
|
|
|
|
B-Ticks - A-Ticks. |
390
|
|
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|
|
|
|
|
391
|
|
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|
392
|
|
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|
|
=head2 getDeltaTicksObject |
393
|
|
|
|
|
|
|
|
394
|
|
|
|
|
|
|
my $Object = $this->getDeltaTicksObject(); |
395
|
|
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|
|
|
|
|
396
|
|
|
|
|
|
|
just a wrapper around ticks_object_out |
397
|
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|
398
|
|
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|
399
|
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|
|
|
=head2 getDiffText |
400
|
|
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|
|
|
|
|
401
|
|
|
|
|
|
|
my $text = $this->getDiffText(); |
402
|
|
|
|
|
|
|
|
403
|
|
|
|
|
|
|
Returns the callgrind text of the diff. |
404
|
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|
405
|
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|
406
|
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|
|
=head2 saveDiffFile |
407
|
|
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|
|
|
|
|
408
|
|
|
|
|
|
|
$this->saveDiffFile($filename); |
409
|
|
|
|
|
|
|
|
410
|
|
|
|
|
|
|
Saves the difference to a callgrind file |
411
|
|
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|
|
|
|
|
412
|
|
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|
413
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414
|
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|
|
=head1 LICENCE |
415
|
|
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|
416
|
|
|
|
|
|
|
You can redistribute it and/or modify it under the conditions of |
417
|
|
|
|
|
|
|
LGPL and Artistic Licence. |
418
|
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|
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419
|
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|
|
420
|
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|
|
=head1 Normalize |
421
|
|
|
|
|
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|
|
422
|
|
|
|
|
|
|
The comand line and the contructor can take the argument 'normalize'. |
423
|
|
|
|
|
|
|
It will avoid to truncate negative values. |
424
|
|
|
|
|
|
|
|
425
|
|
|
|
|
|
|
To understand it, ive got to explain what happens in TicksDiff: |
426
|
|
|
|
|
|
|
If you have to runs of a perl script (Run A and B) with different amount of ticks. |
427
|
|
|
|
|
|
|
|
428
|
|
|
|
|
|
|
A B function |
429
|
|
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|
|
100 120 foo() |
430
|
|
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|
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|
|
120 100 bar() |
431
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|
432
|
|
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|
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|
|
And you make a diff of it, TicksDiff would assume, you want to know how many ticks MORE the run B needs than A. |
433
|
|
|
|
|
|
|
The result would be: |
434
|
|
|
|
|
|
|
|
435
|
|
|
|
|
|
|
A B diff function |
436
|
|
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|
|
100 120 20 foo() |
437
|
|
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|
|
120 100 0 bar() # -20 is the real diff |
438
|
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|
439
|
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|
|
The negative values will ne truncated to 0 because it is not possible to have negative ticks |
440
|
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|
|
(maybe in a black whole ;-) |
441
|
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442
|
|
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|
|
|
|
If you dont want that truncation, you can raise the whole level with the biggest negative value. |
443
|
|
|
|
|
|
|
So the result would be: |
444
|
|
|
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|
|
|
445
|
|
|
|
|
|
|
A B normalized diff function |
446
|
|
|
|
|
|
|
100 120 40 foo() |
447
|
|
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|
|
120 100 0 bar() |
448
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449
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450
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451
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452
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|
=head1 AUTHOR |
453
|
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454
|
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|
|
|
Andreas Hernitscheck - ahernit AT cpan.org |
455
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456
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457
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458
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|
=cut |
459
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