共计 6363 个字符，预计需要花费 16 分钟才能阅读完成。
memcahced perl 管理工具 memcached-tool
#!/usr/bin/perl
#
# memcached-tool:
# stats/management tool for memcached.
#
# Author:
# Brad Fitzpatrick <brad@danga.com>
#
# Contributor:
# Andrey Niakhaichyk <andrey@niakhaichyk.org>
#
# License:
# public domain. I give up all rights to this
# tool. modify and copy at will.
#
use strict;
use IO::Socket::INET;
my $addr = shift;
my $mode = shift || “display”;
my ($from, $to);
if ($mode eq “display”) {
undef $mode if @ARGV;
} elsif ($mode eq “move”) {
$from = shift;
$to = shift;
undef $mode if $from < 6 || $from > 17;
undef $mode if $to < 6 || $to > 17;
print STDERR “ERROR: parameters out of range\n\n” unless $mode;
} elsif ($mode eq ‘dump’) {
;
} elsif ($mode eq ‘stats’) {
;
} elsif ($mode eq ‘settings’) {
;
} elsif ($mode eq ‘sizes’) {
;
} else {
undef $mode;
}
undef $mode if @ARGV;
die
“Usage: memcached-tool <host[:port] | /path/to/socket> [mode]\n
memcached-tool 10.0.0.5:11211 display # shows slabs
memcached-tool 10.0.0.5:11211 # same. (default is display)
memcached-tool 10.0.0.5:11211 stats # shows general stats
memcached-tool 10.0.0.5:11211 settings # shows settings stats
memcached-tool 10.0.0.5:11211 sizes # shows sizes stats
memcached-tool 10.0.0.5:11211 dump # dumps keys and values
WARNING! sizes is a development command.
As of 1.4 it is still the only command which will lock your memcached instance for some time.
If you have many millions of stored items, it can become unresponsive for several minutes.
Run this at your own risk. It is roadmapped to either make this feature optional
or at least speed it up.
” unless $addr && $mode;
my $sock;
if ($addr =~ m:/:) {
$sock = IO::Socket::UNIX->new(
Peer => $addr,
);
}
else {
$addr .= ‘:11211’ unless $addr =~ /:\d+$/;
$sock = IO::Socket::INET->new(
PeerAddr => $addr,
Proto => ‘tcp’,
);
}
die “Couldn’t connect to $addr\n” unless $sock;
if ($mode eq ‘dump’) {
my %items;
my $totalitems;
print $sock “stats items\r\n”;
while (<$sock>) {
last if /^END/;
if (/^STAT items:(\d*):number (\d*)/) {
$items{$1} = $2;
$totalitems += $2;
}
}
print STDERR “Dumping memcache contents\n”;
print STDERR ” Number of buckets: ” . scalar(keys(%items)) . “\n”;
print STDERR ” Number of items : $totalitems\n”;
foreach my $bucket (sort(keys(%items))) {
print STDERR “Dumping bucket $bucket – ” . $items{$bucket} . ” total items\n”;
print $sock “stats cachedump $bucket $items{$bucket}\r\n”;
my %keyexp;
while (<$sock>) {
last if /^END/;
# return format looks like this
# ITEM foo [6 b; 1176415152 s]
if (/^ITEM (\S+) \[.* (\d+) s\]/) {
$keyexp{$1} = $2;
}
}
foreach my $k (keys(%keyexp)) {
print $sock “get $k\r\n”;
my $response = <$sock>;
if ($response =~ /VALUE (\S+) (\d+) (\d+)/) {
my $flags = $2;
my $len = $3;
my $val;
read $sock, $val, $len;
print “add $k $flags $keyexp{$k} $len\r\n$val\r\n”;
# get the END
$_ = <$sock>;
$_ = <$sock>;
}
}
}
exit;
}
if ($mode eq ‘stats’) {
my %items;
print $sock “stats\r\n”;
while (<$sock>) {
last if /^END/;
chomp;
if (/^STAT\s+(\S*)\s+(.*)/) {
$items{$1} = $2;
}
}
printf (“#%-17s %5s %11s\n”, $addr, “Field”, “Value”);
foreach my $name (sort(keys(%items))) {
printf (“%24s %12s\n”, $name, $items{$name});
}
exit;
}
if ($mode eq ‘settings’) {
my %items;
print $sock “stats settings\r\n”;
while (<$sock>) {
last if /^END/;
chomp;
if (/^STAT\s+(\S*)\s+(.*)/) {
$items{$1} = $2;
}
}
printf (“#%-17s %5s %11s\n”, $addr, “Field”, “Value”);
foreach my $name (sort(keys(%items))) {
printf (“%24s %12s\n”, $name, $items{$name});
}
exit;
}
if ($mode eq ‘sizes’) {
my %items;
print $sock “stats sizes\r\n”;
while (<$sock>) {
last if /^END/;
chomp;
if (/^STAT\s+(\S*)\s+(.*)/) {
$items{$1} = $2;
}
}
printf (“#%-17s %5s %11s\n”, $addr, “Size”, “Count”);
foreach my $name (sort(keys(%items))) {
printf (“%24s %12s\n”, $name, $items{$name});
}
exit;
}
# display mode:
my %items; # class -> {number, age, chunk_size, chunks_per_page,
# total_pages, total_chunks, used_chunks,
# free_chunks, free_chunks_end }
print $sock “stats items\r\n”;
my $max = 0;
while (<$sock>) {
last if /^END/;
if (/^STAT items:(\d+):(\w+) (\d+)/) {
$items{$1}{$2} = $3;
}
}
print $sock “stats slabs\r\n”;
while (<$sock>) {
last if /^END/;
if (/^STAT (\d+):(\w+) (\d+)/) {
$items{$1}{$2} = $3;
$max = $1;
}
}
print ” # Item_Size Max_age Pages Count Full? Evicted Evict_Time OOM\n”;
foreach my $n (1..$max) {
my $it = $items{$n};
next if (0 == $it->{total_pages});
my $size = $it->{chunk_size} < 1024 ?
“$it->{chunk_size}B” :
sprintf(“%.1fK”, $it->{chunk_size} / 1024.0);
my $full = $it->{free_chunks_end} == 0 ? “yes” : ” no”;
printf(“%3d %8s %9ds %7d %7d %7s %8d %8d %4d\n”,
$n, $size, $it->{age}, $it->{total_pages},
$it->{number}, $full, $it->{evicted},
$it->{evicted_time}, $it->{outofmemory});
}
使用方法：
将上述代码保存为 memcached-tool 文件.
查看 memcached 状态
[root@node1 ~]# perl Mem.pl 127.0.0.1:11211
# Item_Size Max_age Pages Count Full? Evicted Evict_Time OOM
1 96B 22304s 1 3 yes 0 0 0
2 120B 0s 1 0 yes 0 0 0
[root@node1 ~]# perl Mem.pl 127.0.0.1:11211 stats
#127.0.0.1:11211 Field Value
accepting_conns 1
auth_cmds 0
auth_errors 0
bytes 238
bytes_read 7154
bytes_written 139374
cas_badval 0
cas_hits 0
cas_misses 0
cmd_flush 1
cmd_get 50
cmd_set 67
cmd_touch 0
conn_yields 0
connection_structures 15
crawler_reclaimed 0
curr_connections 12
curr_items 3
decr_hits 30
decr_misses 0
delete_hits 2
delete_misses 0
evicted_unfetched 0
evictions 0
expired_unfetched 0
get_hits 36
get_misses 14
hash_bytes 524288
hash_is_expanding 0
hash_power_level 16
incr_hits 30
incr_misses 0
libevent 2.0.21-stable
limit_maxbytes 33554432
listen_disabled_num 0
malloc_fails 0
pid 48154
pointer_size 64
reclaimed 1
reserved_fds 20
rusage_system 0.594909
rusage_user 1.153824
threads 4
time 1406887940
total_connections 175
total_items 59
touch_hits 0
touch_misses 0
uptime 26566
version 1.4.20
Memcached 安装及启动脚本 http://www.linuxidc.com/Linux/2013-07/87641.htm
PHP 中使用 Memcached 的性能问题 http://www.linuxidc.com/Linux/2013-06/85883.htm
Ubuntu 下安装 Memcached 及命令解释 http://www.linuxidc.com/Linux/2013-06/85832.htm
Memcached 的安装和应用 http://www.linuxidc.com/Linux/2013-08/89165.htm
使用 Nginx+Memcached 的小图片存储方案 http://www.linuxidc.com/Linux/2013-11/92390.htm
Memcached 使用入门 http://www.linuxidc.com/Linux/2011-12/49516p2.htm
