mirror of
https://github.com/percona/percona-toolkit.git
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d3ef9edaaa
Still TODO: Attributes still have a single method that doubles as a getter and setter. The constructor for Diskstats is still weird -- A tad more stricter than it should be, if anything. ->print_rest is still rest, even though that's hardly memorable, mostly because of a lack of ideas on what to rename it. The main loop in the Menu is still a while (1). As a nice perk, it's nearly twice as fast now! It also adds a _very_ experimental --memory-for-speed argument, which turns on memoization for the current biggest bottleneck.
935 lines
26 KiB
Perl
935 lines
26 KiB
Perl
# This program is copyright 2011 Percona Inc.
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# Feedback and improvements are welcome.
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#
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# THIS PROGRAM IS PROVIDED "AS IS" AND WITHOUT ANY EXPRESS OR IMPLIED
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# WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
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# MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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#
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# This program is free software; you can redistribute it and/or modify it under
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# the terms of the GNU General Public License as published by the Free Software
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# Foundation, version 2; OR the Perl Artistic License. On UNIX and similar
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# systems, you can issue `man perlgpl' or `man perlartistic' to read these
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# licenses.
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#
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# You should have received a copy of the GNU General Public License along with
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# this program; if not, write to the Free Software Foundation, Inc., 59 Temple
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# Place, Suite 330, Boston, MA 02111-1307 USA.
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# ###########################################################################
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# Diskstats package
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# ###########################################################################
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{
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# Package: Diskstats
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# This package implements most of the logic in the old shell pt-diskstats;
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# it parses data from /proc/diskstats, calculcates deltas, and prints those.
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package Diskstats;
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use strict;
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use warnings FATAL => 'all';
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use English qw(-no_match_vars);
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use constant MKDEBUG => $ENV{MKDEBUG} || 0;
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use IO::Handle;
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use List::Util qw( max first );
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sub new {
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my ( $class, %args ) = @_;
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my @required_args = qw(OptionParser);
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foreach my $arg ( @required_args ) {
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die "I need a $arg argument" unless $args{$arg};
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}
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my ($o) = @args{@required_args};
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my $self = {
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# Defaults
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filename => '/proc/diskstats',
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column_regex => qr/cnc|rt|busy|prg|time|io_s/,
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device_regex => qr/(?=)/,
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block_size => 512,
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out_fh => \*STDOUT,
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filter_zeroed_rows => $o->get('zero-rows') ? undef : 1,
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sample_time => $o->get('sample-time') || 0,
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interactive => 0,
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_stats_for => {},
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_ordered_devs => [],
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_ts => {},
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_first => 1,
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# Internal for now, but might need APIfying.
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_save_curr_as_prev => 1,
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_print_header => 1,
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};
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if ( $o->get('memory-for-speed') ) {
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eval {
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require Memoize; Memoize::memoize('_parse_diskstats_line')
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};
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if ($EVAL_ERROR) {
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warn "Can't trade memory for speed: $EVAL_ERROR. Continuing as usual.";
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}
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}
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my %pod_to_attribute = (
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columns => 'column_regex',
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devices => 'device_regex'
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);
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for my $key ( grep { defined $o->get($_) } keys %pod_to_attribute ) {
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my $re = $o->get($key) || '(?=)';
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$self->{ $pod_to_attribute{$key} } = qr/$re/i;
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}
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# If they passed us an attribute explicitly, we use those.
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for my $attribute ( grep { !/^_/ && defined $args{$_} } keys %$self ) {
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$self->{$attribute} = $args{$attribute};
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}
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return bless $self, $class;
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}
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# The next lot are accessors, plus some convenience functions.
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sub _ts_common {
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my ($self, $key, $val) = @_;
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if ($val) {
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$self->{_ts}->{$key} = $val;
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}
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return $self->{_ts}->{$key};
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}
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sub curr_ts {
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my ($self, $val) = @_;
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return $self->_ts_common("curr", $val);
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}
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sub prev_ts {
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my ($self, $val) = @_;
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return $self->_ts_common("prev", $val);
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}
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sub first_ts {
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my ($self, $val) = @_;
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return $self->_ts_common("first", $val);
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}
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sub filter_zeroed_rows {
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my ($self, $new_val) = @_;
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if ( defined($new_val) ) {
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$self->{filter_zeroed_rows} = $new_val;
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}
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return $self->{filter_zeroed_rows};
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}
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sub sample_time {
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my ($self, $new_val) = @_;
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if (defined($new_val)) {
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$self->{sample_time} = $new_val;
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}
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return $self->{sample_time};
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}
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sub interactive {
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my ($self, $new_val) = @_;
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if (defined($new_val)) {
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$self->{interactive} = $new_val;
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}
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return $self->{interactive};
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}
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# What this method does is thee-fold:
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# It sets or returns the currently set filehandle, kind of like a poor man's
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# select(); but also, it checks whenever said filehandle is open. If it's not,
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# it defaults to STDOUT.
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sub out_fh {
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my ( $self, $new_fh ) = @_;
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# ->opened comes from IO::Handle.
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if ( $new_fh && ref($new_fh) && $new_fh->opened ) {
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$self->{out_fh} = $new_fh;
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}
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if ( !$self->{out_fh} || !$self->{out_fh}->opened ) {
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$self->{out_fh} = \*STDOUT;
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}
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return $self->{out_fh};
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}
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sub column_regex {
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my ( $self, $new_re ) = @_;
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if ($new_re) {
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return $self->{column_regex} = $new_re;
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}
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return $self->{column_regex};
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}
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sub device_regex {
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my ( $self, $new_re ) = @_;
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if ($new_re) {
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return $self->{device_regex} = $new_re;
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}
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return $self->{device_regex};
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}
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sub filename {
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my ( $self, $new_filename ) = @_;
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if ( $new_filename ) {
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return $self->{filename} = $new_filename;
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}
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return $self->{filename};
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}
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sub block_size {
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my $self = shift;
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return $self->{block_size};
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}
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# Returns a list of devices seen. You may pass an arrayref argument to
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# replace the internal list, but consider using clear_ordered_devs and
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# add_ordered_dev instead.
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sub ordered_devs {
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my ( $self, $replacement_list ) = @_;
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if ( $replacement_list ) {
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$self->{_ordered_devs} = $replacement_list;
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}
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return @{ $self->{_ordered_devs} };
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}
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sub add_ordered_dev {
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my ( $self, $new_dev ) = @_;
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if ( !$self->{_seen_devs}->{$new_dev}++ ) {
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push @{ $self->{_ordered_devs} }, $new_dev;
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}
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return;
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}
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# clear_stuff methods. Like the name says, they clear state stored inside
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# the object.
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sub clear_state {
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my ($self) = @_;
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$self->{_first} = 1;
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$self->{_print_header} = 1;
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$self->clear_curr_stats();
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$self->clear_prev_stats();
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$self->clear_first_stats();
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$self->clear_ts();
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$self->clear_ordered_devs();
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}
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sub clear_ts {
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my ($self) = @_;
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$self->{_ts} = {};
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}
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sub clear_ordered_devs {
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my $self = shift;
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$self->{_seen_devs} = {};
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$self->ordered_devs( [] );
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}
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sub _clear_stats_common {
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my ( $self, $key, @args ) = @_;
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if (@args) {
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for my $dev (@args) {
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$self->{$key}->{$dev} = {};
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}
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}
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else {
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$self->{$key} = {};
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}
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}
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sub clear_curr_stats {
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my ( $self, @args ) = @_;
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$self->_clear_stats_common( "_stats_for", @args );
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}
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sub clear_prev_stats {
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my ( $self, @args ) = @_;
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$self->_clear_stats_common( "_prev_stats_for", @args );
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}
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sub clear_first_stats {
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my ( $self, @args ) = @_;
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$self->_clear_stats_common( "_first_stats_for", @args );
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}
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sub _stats_for_common {
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my ( $self, $dev, $key ) = @_;
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$self->{$key} ||= {};
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if ($dev) {
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return $self->{$key}->{$dev};
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}
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return $self->{$key};
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}
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sub stats_for {
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my ( $self, $dev ) = @_;
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$self->_stats_for_common( $dev, '_stats_for' );
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}
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sub prev_stats_for {
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my ( $self, $dev ) = @_;
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$self->_stats_for_common( $dev, '_prev_stats_for' );
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}
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sub first_stats_for {
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my ( $self, $dev ) = @_;
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$self->_stats_for_common( $dev, '_first_stats_for' );
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}
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sub has_stats {
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my ($self) = @_;
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my $stats = $self->stats_for;
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for my $key ( keys %$stats ) {
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return 1 if $stats->{$key} && %{ $stats->{$key} }
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}
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return;
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}
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sub _save_curr_as_prev {
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my ( $self, $curr ) = @_;
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if ( $self->{_save_curr_as_prev} ) {
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$self->{_prev_stats_for} = $curr;
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for my $dev (keys %$curr) {
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$self->{_prev_stats_for}->{$dev}->{sum_ios_in_progress} +=
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$curr->{$dev}->{ios_in_progress};
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}
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$self->prev_ts($self->curr_ts());
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}
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return;
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}
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sub _save_curr_as_first {
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my ($self, $curr) = @_;
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if ( $self->{_first} ) {
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$self->{_first_stats_for} = {
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# 1-level deep copy of the original structure. Should
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# be enough.
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map { $_ => {%{$curr->{$_}}} } keys %$curr
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};
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$self->first_ts($self->curr_ts());
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$self->{_first} = undef;
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}
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}
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sub _save_stats {
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my ( $self, $stats ) = @_;
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return $self->{_stats_for} = $stats;
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}
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sub trim {
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my ($c) = @_;
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$c =~ s/^\s+//;
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$c =~ s/\s+$//;
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return $c;
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}
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sub col_ok {
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my ( $self, $column ) = @_;
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my $regex = $self->column_regex();
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return ($column =~ $regex) || (trim($column) =~ $regex);
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}
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sub dev_ok {
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my ( $self, $device ) = @_;
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my $regex = $self->device_regex();
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return $device =~ $regex;
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}
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my @columns_in_order = (
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# Column # Format # Key name
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[ " rd_s" => "%7.1f", "reads_sec", ],
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[ "rd_avkb" => "%7.1f", "avg_read_sz", ],
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[ "rd_mb_s" => "%7.1f", "mbytes_read_sec", ],
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[ "rd_io_s" => "%7.1f", "ios_read_sec", ],
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[ "rd_mrg" => "%5.0f%%", "read_merge_pct", ],
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[ "rd_cnc" => "%6.1f", "read_conc", ],
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[ " rd_rt" => "%7.1f", "read_rtime", ],
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[ " wr_s" => "%7.1f", "writes_sec", ],
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[ "wr_avkb" => "%7.1f", "avg_write_sz", ],
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[ "wr_mb_s" => "%7.1f", "mbytes_written_sec", ],
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[ "wr_io_s" => "%7.1f", "ios_written_sec", ],
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[ "wr_mrg" => "%5.0f%%", "write_merge_pct", ],
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[ "wr_cnc" => "%6.1f", "write_conc", ],
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[ " wr_rt" => "%7.1f", "write_rtime", ],
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[ "busy" => "%3.0f%%", "busy", ],
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[ "in_prg" => "%6d", "in_progress", ],
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[ " io_s" => "%7.1f", "s_spent_doing_io", ],
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[ " qtime" => "%6.1f", "qtime", ],
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[ " stime" => "%5.1f", "stime", ],
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);
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{
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my %format_for = ( map { ( $_->[0] => $_->[1] ) } @columns_in_order, );
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sub _format_for {
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my ( $self, $col ) = @_;
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return $format_for{$col};
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}
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}
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{
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my %column_to_key = ( map { ( $_->[0] => $_->[2] ) } @columns_in_order, );
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sub _column_to_key {
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my ( $self, $col ) = @_;
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return $column_to_key{$col};
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}
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}
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# Method: design_print_formats()
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# What says on the label. Returns three things: the format for the header
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# and the data, and an arrayref of the columns used to make it.
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#
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# Parameters:
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# %args - Arguments
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#
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# Optional Arguments:
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# columns - An arrayref with column names. If absent,
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# uses ->col_ok to decide which columns to use.
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# max_device_length - How much space to leave for device names.
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# Defaults to 6.
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#
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sub design_print_formats {
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my ( $self, %args ) = @_;
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my ( $dev_length, $columns ) = @args{qw( max_device_length columns )};
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$dev_length ||= max 6, map length, $self->ordered_devs;
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my ( $header, $format );
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# For each device, print out the following: The timestamp offset and
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# device name.
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$header = $format = qq{%5s %-${dev_length}s };
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if ( !$columns ) {
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@$columns = grep { $self->col_ok($_) } map { $_->[0] } @columns_in_order;
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}
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elsif ( !ref($columns) || ref($columns) ne ref([]) ) {
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die "The columns argument to design_print_formats should be an arrayref";
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}
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$header .= join " ", @$columns;
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$format .= join " ", map $self->_format_for($_), @$columns;
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return ( $header, $format, $columns );
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}
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{
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# This is hot code. In any given run it could end up being called
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# thousands of times, so beware: Here could be dragons.
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my @diskstats_fields = qw(
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reads reads_merged read_sectors ms_spent_reading
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writes writes_merged written_sectors ms_spent_writing
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ios_in_progress ms_spent_doing_io ms_weighted
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);
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# This allows parse_diskstats_line() to be overriden, but also to be
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# memoized without a normalization function.
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# Magic goto, removes this function from the return stack. Haven't
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# benchmarked it, but ostensibly faster.
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sub parse_diskstats_line { shift; goto &_parse_diskstats_line }
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sub _parse_diskstats_line {
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my ( $line, $block_size ) = @_;
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my $dev;
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keys my %dev_stats = 30; # Pre-expand the amount of buckets for this hash.
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# The following split replaces this:
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# $line =~ /^
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# # Disk format
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# \s* (\d+) # major
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# \s+ (\d+) # minor
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# \s+ (.+?) # Device name
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# \s+ (\d+) # # of reads issued
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# \s+ (\d+) # # of reads merged
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# \s+ (\d+) # # of sectors read
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# \s+ (\d+) # # of milliseconds spent reading
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# \s+ (\d+) # # of writes completed
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# \s+ (\d+) # # of writes merged
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# \s+ (\d+) # # of sectors written
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# \s+ (\d+) # # of milliseconds spent writing
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# \s+ (\d+) # # of IOs currently in progress
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# \s+ (\d+) # # of milliseconds spent doing IOs
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# \s+ (\d+) # weighted # of milliseconds spent doing IOs
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# \s*$/x
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#
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# Since we assume that device names can't have spaces.
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# Assigns the first two elements of the list created by split() into
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# %dev_stats as the major and minor, the third element into $dev,
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# and the remaining elements back into %dev_stats.
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if ( 14 == (( @dev_stats{qw( major minor )}, $dev, @dev_stats{@diskstats_fields} ) =
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split " ", $line, 14 ) )
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{
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$dev_stats{read_kbs} =
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( $dev_stats{read_bytes} = $dev_stats{read_sectors}
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* $block_size ) / 1024;
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$dev_stats{written_kbs} =
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( $dev_stats{written_bytes} = $dev_stats{written_sectors}
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* $block_size ) / 1024;
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$dev_stats{ios_requested} = $dev_stats{reads}
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+ $dev_stats{writes};
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$dev_stats{ios_in_bytes} = $dev_stats{read_bytes}
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+ $dev_stats{written_bytes};
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return ( $dev, \%dev_stats );
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}
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elsif ((@dev_stats{qw( major minor )}, $dev,
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@dev_stats{ qw( reads read_sectors writes written_sectors ) }) =
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$line =~ /^
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# Partition format
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\s* (\d+) # major
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\s+ (\d+) # minor
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\s+ (.+?) # Device name
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\s+ (\d+) # # of reads issued
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\s+ (\d+) # # of sectors read
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\s+ (\d+) # # of writes issued
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|
\s+ (\d+) # # of sectors written
|
|
\s*$/x)
|
|
{
|
|
for my $key ( @diskstats_fields ) {
|
|
$dev_stats{$key} ||= 0;
|
|
}
|
|
# Copypaste from above, should probably abstract, but it would make
|
|
# the common case slower.
|
|
$dev_stats{read_bytes} = $dev_stats{read_sectors} * $block_size;
|
|
$dev_stats{written_bytes} =
|
|
$dev_stats{written_sectors} * $block_size;
|
|
$dev_stats{read_kbs} = $dev_stats{read_bytes} / 1024;
|
|
$dev_stats{written_kbs} = $dev_stats{written_bytes} / 1024;
|
|
$dev_stats{ios_requested} = $dev_stats{reads} + $dev_stats{writes};
|
|
$dev_stats{ios_in_bytes} = $dev_stats{read_bytes}
|
|
+ $dev_stats{written_bytes};
|
|
|
|
return ( $dev, \%dev_stats );
|
|
}
|
|
else {
|
|
return;
|
|
}
|
|
}
|
|
}
|
|
|
|
# Method: parse_from()
|
|
# Parses data from one of the sources.
|
|
#
|
|
# Parameters:
|
|
# %args - Arguments
|
|
#
|
|
# Optional Arguments:
|
|
# filehandle - Reads data from a filehandle by calling readline()
|
|
# on it.
|
|
# data - Reads data one line at a time.
|
|
# filename - Opens a filehandle to the file and reads it one
|
|
# line at a time.
|
|
# sample_callback - Called each time a sample is processed, passed
|
|
# the latest timestamp.
|
|
#
|
|
|
|
sub parse_from {
|
|
my ( $self, %args ) = @_;
|
|
|
|
my $lines_read = $args{filehandle}
|
|
? $self->parse_from_filehandle( @args{qw( filehandle sample_callback )} )
|
|
: $args{data}
|
|
? $self->parse_from_data( @args{qw( data sample_callback )} )
|
|
: $self->parse_from_filename( @args{qw( filename sample_callback )} );
|
|
return $lines_read;
|
|
}
|
|
|
|
|
|
sub parse_from_filename {
|
|
my ( $self, $filename, $sample_callback ) = @_;
|
|
|
|
$filename ||= $self->filename();
|
|
|
|
open my $fh, "<", $filename
|
|
or die "Cannot parse $filename: $OS_ERROR";
|
|
my $lines_read = $self->parse_from_filehandle( $fh, $sample_callback );
|
|
close $fh or die "Cannot close: $OS_ERROR";
|
|
|
|
return $lines_read;
|
|
}
|
|
|
|
# Method: parse_from_filehandle()
|
|
# Parses data received from using readline() on the filehandle. This is
|
|
# particularly useful, as you could pass in a filehandle to a pipe, or
|
|
# a tied filehandle, or a PerlIO::Scalar handle. Or your normal
|
|
# run of the mill filehandle.
|
|
#
|
|
# Parameters:
|
|
# filehandle -
|
|
# sample_callback - Called each time a sample is processed, passed
|
|
# the latest timestamp.
|
|
#
|
|
|
|
sub parse_from_filehandle {
|
|
my ( $self, $filehandle, $sample_callback ) = @_;
|
|
return $self->_load( $filehandle, $sample_callback );
|
|
}
|
|
|
|
# Method: parse_from_data()
|
|
# Similar to parse_from_filehandle, but uses a reference to a scalar
|
|
# as a filehandle
|
|
#
|
|
# Parameters:
|
|
# data - A normal Perl scalar, or a ref to a scalar.
|
|
# sample_callback - Same as parse_from_filehandle.
|
|
#
|
|
sub parse_from_data {
|
|
my ( $self, $data, $sample_callback ) = @_;
|
|
|
|
open( my $fh, "<", ref($data) ? $data : \$data )
|
|
or die "Couldn't parse data: $OS_ERROR";
|
|
my $lines_read = $self->parse_from_filehandle( $fh, $sample_callback );
|
|
close $fh or die "";
|
|
|
|
return $lines_read;
|
|
}
|
|
|
|
# Method: _load()
|
|
# !!!!INTERNAL!!!!!
|
|
# Reads from the filehandle, either saving the data as needed if dealing
|
|
# with a diskstats-formatted line, or if it finds a TS line and has a
|
|
# callback, defering to that.
|
|
|
|
sub _load {
|
|
my ( $self, $fh, $sample_callback ) = @_;
|
|
my $block_size = $self->block_size();
|
|
my $current_ts = 0;
|
|
my $new_cur = {};
|
|
|
|
while ( my $line = <$fh> ) {
|
|
if ( my ( $dev, $dev_stats ) = $self->parse_diskstats_line($line, $block_size) )
|
|
{
|
|
$new_cur->{$dev} = $dev_stats;
|
|
$self->add_ordered_dev($dev);
|
|
}
|
|
elsif ( my ($new_ts) = $line =~ /TS\s+([0-9]+(?:\.[0-9]+)?)/ ) {
|
|
if ( $current_ts && %$new_cur ) {
|
|
$self->_save_curr_as_prev( $self->stats_for() );
|
|
$self->_save_stats($new_cur);
|
|
$self->curr_ts($current_ts);
|
|
$self->_save_curr_as_first( $new_cur );
|
|
$new_cur = {};
|
|
}
|
|
if ($sample_callback) {
|
|
$self->$sample_callback($current_ts);
|
|
}
|
|
$current_ts = $new_ts;
|
|
}
|
|
else {
|
|
chomp($line);
|
|
warn "Line $INPUT_LINE_NUMBER: [$line] isn't in the diskstats format";
|
|
}
|
|
}
|
|
|
|
if ( $current_ts ) {
|
|
if ( %{$new_cur} ) {
|
|
$self->_save_curr_as_prev( $self->stats_for() );
|
|
$self->_save_stats($new_cur);
|
|
$self->curr_ts($current_ts);
|
|
$self->_save_curr_as_first( $new_cur );
|
|
$new_cur = {};
|
|
}
|
|
if ($sample_callback) {
|
|
$self->$sample_callback($current_ts);
|
|
}
|
|
}
|
|
# Seems like this could be useful.
|
|
return $INPUT_LINE_NUMBER;
|
|
}
|
|
|
|
sub _calc_read_stats {
|
|
my ( $self, %args ) = @_;
|
|
|
|
my @required_args = qw( delta_for elapsed devs_in_group );
|
|
foreach my $arg ( @required_args ) {
|
|
die "I need a $arg argument" unless $args{$arg};
|
|
}
|
|
my ($delta_for, $elapsed, $devs_in_group) = @args{ @required_args };
|
|
|
|
my %read_stats = (
|
|
reads_sec => $delta_for->{reads} / $elapsed,
|
|
read_requests => $delta_for->{reads_merged} + $delta_for->{reads},
|
|
mbytes_read_sec => $delta_for->{read_kbs} / $elapsed / 1024,
|
|
ios_read_sec => $delta_for->{ms_spent_reading} / 1000,
|
|
read_conc => $delta_for->{ms_spent_reading} /
|
|
$elapsed / 1000 / $devs_in_group,
|
|
);
|
|
|
|
if ( $delta_for->{reads} > 0 ) {
|
|
$read_stats{read_rtime} =
|
|
$delta_for->{ms_spent_reading} / $delta_for->{reads};
|
|
$read_stats{avg_read_sz} =
|
|
$delta_for->{read_kbs} / $delta_for->{reads};
|
|
}
|
|
else {
|
|
$read_stats{read_rtime} = 0;
|
|
$read_stats{avg_read_sz} = 0;
|
|
}
|
|
|
|
$read_stats{read_merge_pct} =
|
|
$read_stats{read_requests} > 0
|
|
? 100 * $delta_for->{reads_merged} / $read_stats{read_requests}
|
|
: 0;
|
|
|
|
return %read_stats;
|
|
}
|
|
|
|
sub _calc_write_stats {
|
|
my ( $self, %args ) = @_;
|
|
|
|
my @required_args = qw( delta_for elapsed devs_in_group );
|
|
foreach my $arg ( @required_args ) {
|
|
die "I need a $arg argument" unless $args{$arg};
|
|
}
|
|
my ($delta_for, $elapsed, $devs_in_group) = @args{ @required_args };
|
|
|
|
my %write_stats = (
|
|
writes_sec => $delta_for->{writes} / $elapsed,
|
|
write_requests => $delta_for->{writes_merged} + $delta_for->{writes},
|
|
mbytes_written_sec => $delta_for->{written_kbs} / $elapsed / 1024,
|
|
ios_written_sec => $delta_for->{ms_spent_writing} / 1000,
|
|
write_conc => $delta_for->{ms_spent_writing} /
|
|
$elapsed / 1000 /
|
|
$devs_in_group,
|
|
);
|
|
|
|
if ( $delta_for->{writes} > 0 ) {
|
|
$write_stats{write_rtime} =
|
|
$delta_for->{ms_spent_writing} / $delta_for->{writes};
|
|
$write_stats{avg_write_sz} =
|
|
$delta_for->{written_kbs} / $delta_for->{writes};
|
|
}
|
|
else {
|
|
$write_stats{write_rtime} = 0;
|
|
$write_stats{avg_write_sz} = 0;
|
|
}
|
|
|
|
$write_stats{write_merge_pct} =
|
|
$write_stats{write_requests} > 0
|
|
? 100 * $delta_for->{writes_merged} / $write_stats{write_requests}
|
|
: 0;
|
|
|
|
return %write_stats;
|
|
}
|
|
|
|
|
|
# Compute the numbers for reads and writes together, the things for
|
|
# which we do not have separate statistics.
|
|
|
|
sub _calc_misc_stats {
|
|
my ( $self, %args ) = @_;
|
|
|
|
my @required_args = qw( delta_for elapsed devs_in_group stats );
|
|
foreach my $arg ( @required_args ) {
|
|
die "I need a $arg argument" unless $args{$arg};
|
|
}
|
|
my ($delta_for, $elapsed, $devs_in_group, $stats) = @args{ @required_args };
|
|
my %extra_stats;
|
|
|
|
# Busy is what iostat calls %util. This is the percent of
|
|
# wall-clock time during which the device has I/O happening.
|
|
$extra_stats{busy} =
|
|
100 *
|
|
$delta_for->{ms_spent_doing_io} /
|
|
( 1000 * $elapsed * $devs_in_group );
|
|
|
|
my $number_of_ios = $stats->{ios_requested};
|
|
my $total_ms_spent_on_io = $delta_for->{ms_spent_reading}
|
|
+ $delta_for->{ms_spent_writing};
|
|
|
|
if ( $number_of_ios ) {
|
|
$extra_stats{qtime} = $total_ms_spent_on_io / $number_of_ios;
|
|
$extra_stats{stime} = $delta_for->{ms_spent_doing_io} / $number_of_ios;
|
|
}
|
|
else {
|
|
$extra_stats{qtime} = 0;
|
|
$extra_stats{stime} = 0;
|
|
}
|
|
|
|
$extra_stats{s_spent_doing_io} = $total_ms_spent_on_io / 1000;
|
|
|
|
$extra_stats{line_ts} = $self->compute_line_ts(
|
|
first_ts => $self->first_ts(),
|
|
curr_ts => $self->curr_ts(),
|
|
);
|
|
|
|
return %extra_stats;
|
|
}
|
|
|
|
sub _calc_delta_for {
|
|
my ( $self, $curr, $against ) = @_;
|
|
my %deltas = (
|
|
map { ( $_ => ($curr->{$_} || 0) - ($against->{$_} || 0) ) }
|
|
qw(
|
|
reads reads_merged read_sectors ms_spent_reading
|
|
writes writes_merged written_sectors ms_spent_writing
|
|
read_kbs written_kbs
|
|
ms_spent_doing_io ms_weighted
|
|
)
|
|
);
|
|
return \%deltas;
|
|
}
|
|
|
|
sub _calc_stats_for_deltas {
|
|
my ( $self, $elapsed ) = @_;
|
|
my @end_stats;
|
|
my @devices = $self->ordered_devs();
|
|
|
|
my $devs_in_group = $self->compute_devs_in_group();
|
|
|
|
# Read "For each device that passes the regex, and we have stats for"
|
|
foreach my $dev (
|
|
grep { $self->dev_ok($_) && $self->stats_for($_) }
|
|
@devices )
|
|
{
|
|
my $curr = $self->stats_for($dev);
|
|
my $against = $self->delta_against($dev);
|
|
|
|
my $delta_for = $self->_calc_delta_for( $curr, $against );
|
|
my $in_progress = $curr->{"ios_in_progress"};
|
|
my $tot_in_progress = $against->{"sum_ios_in_progress"} || 0;
|
|
|
|
# Compute the per-second stats for reads, writes, and overall.
|
|
my %stats = (
|
|
$self->_calc_read_stats(
|
|
delta_for => $delta_for,
|
|
elapsed => $elapsed,
|
|
devs_in_group => $devs_in_group,
|
|
),
|
|
$self->_calc_write_stats(
|
|
delta_for => $delta_for,
|
|
elapsed => $elapsed,
|
|
devs_in_group => $devs_in_group,
|
|
),
|
|
in_progress =>
|
|
$self->compute_in_progress( $in_progress, $tot_in_progress ),
|
|
);
|
|
|
|
my %extras = $self->_calc_misc_stats(
|
|
delta_for => $delta_for,
|
|
elapsed => $elapsed,
|
|
devs_in_group => $devs_in_group,
|
|
stats => \%stats,
|
|
);
|
|
|
|
@stats{ keys %extras } = values %extras;
|
|
|
|
$stats{dev} = $dev;
|
|
|
|
push @end_stats, \%stats;
|
|
}
|
|
return @end_stats;
|
|
}
|
|
|
|
sub _calc_deltas {
|
|
my ( $self ) = @_;
|
|
|
|
my $elapsed = $self->curr_ts() - $self->delta_against_ts();
|
|
die "Time elapsed is [$elapsed]" unless $elapsed;
|
|
|
|
return $self->_calc_stats_for_deltas($elapsed);
|
|
}
|
|
|
|
sub print_header {
|
|
my ($self, $header, @args) = @_;
|
|
if ( $self->{_print_header} ) {
|
|
printf { $self->out_fh() } $header . "\n", @args;
|
|
}
|
|
}
|
|
|
|
sub print_rest {
|
|
my ($self, $format, $cols, $stat) = @_;
|
|
if ( $self->filter_zeroed_rows() ) {
|
|
# Conundrum: What is "zero"?
|
|
# Is 0.000001 zero? How about 0.1?
|
|
# Here the answer is "it looks like zero after formatting";
|
|
# unfortunately, we lack the formats at this point. We could
|
|
# fetch them again, but that's a pain, so instead we use
|
|
# %7.1f, which is what most of them are anyway, and should
|
|
# work for nearly all cases.
|
|
return unless grep {
|
|
sprintf("%7.1f", $_) != 0
|
|
} @{$stat}{ @$cols };
|
|
}
|
|
printf { $self->out_fh() } $format . "\n",
|
|
@{$stat}{ qw( line_ts dev ), @$cols };
|
|
}
|
|
|
|
sub print_deltas {
|
|
my ( $self, %args ) = @_;
|
|
my ( $header, $format, $cols ) = $self->design_print_formats(
|
|
max_device_length => $args{max_device_length},
|
|
columns => $args{columns},
|
|
);
|
|
|
|
return unless $self->delta_against_ts();
|
|
|
|
@$cols = map { $self->_column_to_key($_) } @$cols;
|
|
my ( $header_callback, $rest_callback ) = @args{qw( header_callback rest_callback )};
|
|
|
|
if ( $header_callback ) {
|
|
$self->$header_callback( $header, "#ts", "device" );
|
|
}
|
|
else {
|
|
$self->print_header( $header, "#ts", "device" );
|
|
}
|
|
|
|
for my $stat ( $self->_calc_deltas() ) {
|
|
if ($rest_callback) {
|
|
$self->$rest_callback( $format, $cols, $stat );
|
|
}
|
|
else {
|
|
$self->print_rest( $format, $cols, $stat );
|
|
}
|
|
}
|
|
}
|
|
|
|
sub compute_line_ts {
|
|
my ( $self, %args ) = @_;
|
|
return sprintf( "%5.1f", $args{first_ts} > 0
|
|
? $args{curr_ts} - $args{first_ts}
|
|
: 0 );
|
|
}
|
|
|
|
sub compute_in_progress {
|
|
my ( $self, $in_progress, $tot_in_progress ) = @_;
|
|
return $in_progress;
|
|
}
|
|
|
|
sub compute_devs_in_group {
|
|
return 1;
|
|
}
|
|
|
|
sub delta_against {
|
|
die 'You must override delta_against() in a subclass';
|
|
}
|
|
|
|
sub delta_against_ts {
|
|
die 'You must override delta_against_ts() in a subclass';
|
|
}
|
|
|
|
sub group_by {
|
|
die 'You must override group_by() in a subclass';
|
|
}
|
|
|
|
1;
|
|
|
|
}
|
|
# ###########################################################################
|
|
# End Diskstats package
|
|
# ###########################################################################
|