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# This program is copyright 2011 Percona Ireland Ltd.
# Feedback and improvements are welcome.
#
# THIS PROGRAM IS PROVIDED "AS IS" AND WITHOUT ANY EXPRESS OR IMPLIED
# WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
# MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
#
# This program is free software; you can redistribute it and/or modify it under
# the terms of the GNU General Public License as published by the Free Software
# Foundation, version 2; OR the Perl Artistic License. On UNIX and similar
# systems, you can issue `man perlgpl' or `man perlartistic' to read these
# licenses.
#
# You should have received a copy of the GNU General Public License along with
# this program; if not, write to the Free Software Foundation, Inc., 59 Temple
# Place, Suite 330, Boston, MA 02111-1307 USA.
# ###########################################################################
# DiskstatsGroupByDisk package
# ###########################################################################
{
# Package: DiskstatsGroupByDisk
#
package DiskstatsGroupByDisk;
use warnings;
use strict;
use English qw(-no_match_vars);
use constant PTDEBUG => $ENV{PTDEBUG} || 0;
use base qw( Diskstats );
use POSIX qw( ceil );
sub new {
my ($class, %args) = @_;
my $self = $class->SUPER::new(%args);
$self->{_iterations} = 0;
return $self;
}
# Prints out one line for each disk, summing over the interval from first to
# last sample.
sub group_by {
my ($self, %args) = @_;
my @optional_args = qw( header_callback rows_callback );
my ($header_callback, $rows_callback) = $args{ @optional_args };
$self->clear_state() unless $self->interactive();
my $original_offset = ($args{filehandle} || ref($args{data}))
? tell($args{filehandle} || $args{data})
: undef;
my $lines_read = $self->parse_from(
sample_callback => sub {
my ($self, $ts) = @_;
if ( $self->has_stats() ) {
$self->{_iterations}++;
if ($self->interactive() && $self->{_iterations} >= 2) {
my $elapsed = ( $self->curr_ts() || 0 )
- ( $self->first_ts() || 0 );
if ( $ts > 0 && ceil($elapsed) >= $self->sample_time() ) {
$self->print_deltas(
header_callback => sub {
my ($self, @args) = @_;
if ( $self->force_header() ) {
my $method = $args{header_callback}
|| "print_header";
$self->$method(@args);
}
$self->set_force_header(undef);
},
rows_callback => $args{rows_callback},
);
return;
}
}
}
},
filehandle => $args{filehandle},
filename => $args{filename},
data => $args{data},
);
if ($self->interactive()) {
# This is a guard against the weird but nasty situation where
# we read several samples from the filehandle, but reach
# the end of file before $elapsed >= $self->sample_time().
# If that happens, we need to rewind the filehandle to
# where we started, so subsequent attempts (i.e. when
# the file has more data) have greater chances of succeeding,
# and no data goes unreported.
return $lines_read;
}
return if $self->{_iterations} < 2;
$self->print_deltas(
header_callback => $args{header_callback},
rows_callback => $args{rows_callback},
);
$self->clear_state();
return $lines_read;
}
sub clear_state {
my ($self, @args) = @_;
my $orig_print_h = $self->{force_header};
$self->{_iterations} = 0;
$self->SUPER::clear_state(@args);
$self->{force_header} = $orig_print_h;
}
sub compute_line_ts {
my ($self, %args) = @_;
if ( $self->show_timestamps() ) {
return $self->SUPER::compute_line_ts(%args);
}
else {
return "{" . ($self->{_iterations} - 1) . "}";
}
}
sub delta_against {
my ($self, $dev) = @_;
return $self->first_stats_for($dev);
}
sub ts_line_for_timestamp {
my ($self) = @_;
return $self->prev_ts_line();
}
sub delta_against_ts {
my ($self) = @_;
return $self->first_ts();
}
sub compute_in_progress {
my ($self, $in_progress, $tot_in_progress) = @_;
return $tot_in_progress / ($self->{_iterations} - 1);
}
1;
}
# ###########################################################################
# End DiskstatsGroupByDisk package
# ###########################################################################
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