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arcstat.pl
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arcstat.pl
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#!/tmp/guds_perl -w
use strict;
use POSIX qw(strftime);
use Sun::Solaris::Kstat;
use Getopt::Long;
use IO::Handle;
use integer;
my %cols = (# HDR => [Size, Description]
"Time" =>[8, "Time"],
"hits" =>[4, "Arc reads per second"],
"miss" =>[4, "Arc misses per second"],
"read" =>[4, "Total Arc accesses per second"],
"Hit%" =>[4, "Arc Hit percentage"],
"miss%" =>[5, "Arc miss percentage"],
"dhit" =>[4, "Demand Data hits per second"],
"dmis" =>[4, "Demand Data misses per second"],
"dh%" =>[3, "Demand Data hit percentage"],
"dm%" =>[3, "Demand Data miss percentage"],
"phit" =>[4, "Prefetch hits per second"],
"pmis" =>[4, "Prefetch misses per second"],
"ph%" =>[3, "Prefetch hits percentage"],
"pm%" =>[3, "Prefetch miss percentage"],
"mhit" =>[4, "Metadata hits per second"],
"mmis" =>[4, "Metadata misses per second"],
"mread" =>[5, "Metadata accesses per second"],
"mh%" =>[3, "Metadata hit percentage"],
"mm%" =>[3, "Metadata miss percentage"],
"arcsz" =>[5, "Arc Size"],
"c" =>[4, "Arc Target Size"],
"mfu" =>[4, "MFU List hits per second"],
"mru" =>[4, "MRU List hits per second"],
"mfug" =>[4, "MFU Ghost List hits per second"],
"mrug" =>[4, "MRU Ghost List hits per second"],
"eskip" =>[5, "evict_skip per second"],
"mtxmis"=>[6, "mutex_miss per second"],
"rmis" =>[4, "recycle_miss per second"],
"dread" =>[5, "Demand data accesses per second"],
"pread" =>[5, "Prefetch accesses per second"],
);
my %szcol = (
"arcsz" => 1,
"c" => 1
);
my %v=();
my @hdr = qw(Time read miss miss% dmis dm% pmis pm% mmis mm% arcsz c);
my @xhdr = qw(Time mfu mru mfug mrug eskip mtxmis rmis dread pread read);
my $int = 1; # Print stats every 1 second by default
my $count = 0; # Print stats forever
my $hdr_intr = 20; # Print header every 20 lines of output
my $opfile = "";
my $sep = " "; # Default seperator is 2 spaces
my $version = "0.2";
my $cmd = "Usage: arcstat.pl [-hvx] [-f fields] [-o file] [interval [count]]\n";
my %cur;
my %d;
my $out;
my $kstat = Sun::Solaris::Kstat->new();
STDOUT->autoflush;
sub detailed_usage {
print STDERR "Arcstat version $version\n$cmd";
print STDERR "Field definitions are as follows\n";
foreach my $hdr (keys %cols) {
print STDERR sprintf("%6s : %s\n", $hdr, $cols{$hdr}[1]);
}
print STDERR "\nNote: K=10^3 M=10^6 G=10^9 and so on\n";
exit(1);
}
sub usage {
print STDERR "Arcstat version $version\n$cmd";
print STDERR "\t -x : Print extended stats\n";
print STDERR "\t -f : Specify specific fields to print (see -v)\n";
print STDERR "\t -o : Print stats to file\n";
print STDERR "\t -s : Specify a seperator\n\nExamples:\n";
print STDERR "\tarcstat -o /tmp/a.log 2 10\n";
print STDERR "\tarcstat -s , -o /tmp/a.log 2 10\n";
print STDERR "\tarcstat -v\n";
print STDERR "\tarcstat -f Time,Hit%,dh%,ph%,mh%\n";
exit(1);
}
sub init {
my $desired_cols;
my $xflag = '';
my $hflag = '';
my $vflag;
my $res = GetOptions('x' => \$xflag,
'o=s' => \$opfile,
'help|h|?' => \$hflag,
'v' => \$vflag,
's=s' => \$sep,
'f=s' => \$desired_cols);
$int = $ARGV[0] || $int;
$count = $ARGV[1] || $count;
usage() if !$res or $hflag or ($xflag and $desired_cols);
detailed_usage() if $vflag;
@hdr = @xhdr if $xflag; #reset headers to xhdr
if ($desired_cols) {
@hdr = split(/[ ,]+/, $desired_cols);
# Now check if they are valid fields
my @invalid = ();
foreach my $ele (@hdr) {
push(@invalid, $ele) if not exists($cols{$ele});
}
if (scalar @invalid > 0) {
print STDERR "Invalid column definition! -- "
. "@invalid\n\n";
usage();
}
}
if ($opfile) {
open($out, ">$opfile") ||die "Cannot open $opfile for writing";
$out->autoflush;
select $out;
}
}
# Capture kstat statistics. We maintain 3 hashes, prev, cur, and
# d (delta). As their names imply they maintain the previous, current,
# and delta (cur - prev) statistics.
sub snap_stats {
my %prev = %cur;
if ($kstat->update()) {
printf("<State Changed>\n");
}
my $hashref_cur = $kstat->{"zfs"}{0}{"arcstats"};
%cur = %$hashref_cur;
foreach my $key (keys %cur) {
next if $key =~ /class/;
if (defined $prev{$key}) {
$d{$key} = $cur{$key} - $prev{$key};
} else {
$d{$key} = $cur{$key};
}
}
}
# Pretty print num. Arguments are width, num, and divisor
sub prettynum {
my @suffix=(' ','K', 'M', 'G', 'T', 'P', 'E', 'Z');
my $num = $_[1] || 0;
my $sz = $_[0];
my $index = 0;
return sprintf("%s", $num) if not $num =~ /^[0-9\.]+$/;
while ($num >= $_[2] and $index < 8) {
$num = $num/$_[2];
$index++;
}
return sprintf("%*d", $sz, $num) if ($index == 0);
return sprintf("%*d%s", $sz - 1, $num,$suffix[$index]);
}
sub print_values {
foreach my $col (@hdr) {
if (defined $v{$col}) {
my $divisor = defined $szcol{$col} ? 1024 : 1000;
printf("%s%s", prettynum($cols{$col}[0], $v{$col}, $divisor), $sep);
}
}
printf("\n");
}
sub print_header {
foreach my $col (@hdr) {
if (defined $v{$col}) {
printf("%*s%s", $cols{$col}[0], $col, $sep);
}
}
printf("\n");
}
sub calculate {
%v=();
$v{"Time"} = strftime("%H:%M:%S", localtime);
$v{"hits"} = $d{"hits"}/$int;
$v{"miss"} = $d{"misses"}/$int;
$v{"read"} = $v{"hits"} + $v{"miss"};
$v{"Hit%"} = $v{"read"} > 0 ? 100*$v{"hits"}/$v{"read"} : 0;
$v{"miss%"} = $v{"read"} > 0 ? 100 - $v{"Hit%"} : 0;
$v{"dhit"} = ($d{"demand_data_hits"} + $d{"demand_metadata_hits"})/$int;
$v{"dmis"} = ($d{"demand_data_misses"}+$d{"demand_metadata_misses"})/$int;
$v{"dread"} = $v{"dhit"} + $v{"dmis"};
$v{"dh%"} = $v{"dread"} > 0 ? 100*$v{"dhit"}/$v{"dread"} : 0;
$v{"dm%"} = $v{"dread"} > 0 ? 100 - $v{"dh%"} : 0;
$v{"phit"} = ($d{"prefetch_data_hits"} + $d{"prefetch_metadata_hits"})/$int;
if (defined $d{"prefetch_metadata_misses"}) {
$v{"pmis"} = ($d{"prefetch_data_misses"}+$d{"prefetch_metadata_misses"})/$int;
} else {
$v{"pmis"} = 0; # S11.3 removed the above 2 kstats when the prefetch code changed
}
$v{"pread"} = $v{"phit"} + $v{"pmis"};
$v{"ph%"} = $v{"pread"} > 0 ? 100*$v{"phit"}/$v{"pread"} : 0;
$v{"pm%"} = $v{"pread"} > 0 ? 100 - $v{"ph%"} : 0;
$v{"mhit"} = ($d{"prefetch_metadata_hits"}+$d{"demand_metadata_hits"})/$int;
if (defined $d{"prefetch_metadata_misses"}) {
$v{"mmis"} = ($d{"prefetch_metadata_misses"}+$d{"demand_metadata_misses"})/$int;
} else {
$v{"mmis"} = ($d{"demand_metadata_misses"})/$int;
# S11.3 removed the prefetch_metadata_misses kstat when the prefetch code changed
}
$v{"mread"} = $v{"mhit"} + $v{"mmis"};
$v{"mh%"} = $v{"mread"} > 0 ? 100*$v{"mhit"}/$v{"mread"} : 0;
$v{"mm%"} = $v{"mread"} > 0 ? 100 - $v{"mh%"} : 0;
$v{"arcsz"} = $cur{"size"};
$v{"c"} = $cur{"c"};
$v{"mfu"} = $d{"hits"}/$int;
$v{"mru"} = $d{"mru_hits"}/$int;
$v{"mrug"} = $d{"mru_ghost_hits"}/$int;
$v{"mfug"} = $d{"mru_ghost_hits"}/$int;
$v{"eskip"} = $d{"evict_skip"}/$int if defined $d{"evict_skip"};
$v{"rmiss"} = $d{"recycle_miss"}/$int if defined $d{"recycle_miss"};
$v{"mtxmis"} = $d{"mutex_miss"}/$int if defined $d{"mutex_miss"};
}
sub main {
my $i = 0;
my $count_flag = 0;
init();
if ($count > 0) { $count_flag = 1; }
while (1) {
snap_stats();
calculate();
print_header() if ($i == 0);
print_values();
last if ($count_flag == 1 && $count-- <= 1);
$i = ($i == $hdr_intr) ? 0 : $i+1;
sleep($int);
}
close($out) if defined $out;
}
&main;