memcahed安装及测试

安装libevent

libevent 最新的稳定版:

wget http://monkey.org/~provos/libevent-1.4.14b-stable.tar.gz 
tar zxvf libevent-1.4.14b-stable.tar.gz
cd libevent-1.4.14b-stable
./configure --prefix=/usr/local/libevent/
make
su root
make install

memcahed安装

memcached 最新的稳定版：

wget  http://memcached.googlecode.com/files/memcached-1.4.5.tar.gz
tar zxvf  memcached-1.4.5.tar.gz
cd memcached-1.4.5
./configure --prefix=/home/hadoop/soft/memcached --with-libevent=/usr/local/libevent/
make 
make install
ln -s /usr/local/libevent/lib/libevent-1.4.so.2 /lib/libevent-1.4.so.2

启动 memcached

启动参数说明：
-d 选项是启动一个守护进程，
-m 是分配给Memcache使用的内存数量，单位是MB，默认64MB
-M return error on memory exhausted (rather than removing items)
-u 是运行Memcache的用户，如果当前为root 的话，需要使用此参数指定用户。
-l 是监听的服务器IP地址，默认为所有网卡。
-p 是设置Memcache的TCP监听的端口，最好是1024以上的端口
-c 选项是最大运行的并发连接数，默认是1024
-P 是设置保存Memcache的pid文件
-f chunk size growth factor (default: 1.25)
-I Override the size of each slab page. Adjusts max item size(1.4.2版本新增)

也可以启动多个守护进程，但是端口不能重复

bin/memcached -d -m 64 -u hadoop -l 127.0.0.1 -p 11211 -c 128 -P /tmp/memcached.pid

编写memcached服务启停脚本

cd /etc/init.d
vi memcached

脚本内容如下：

#!/bin/sh
#
# Startup script for the server of memcached
#http://blog.rekfan.com/?p=172
# processname: memcached
# pidfile: /usr/local/memcached/memcached.pid
# logfile: /usr/local/memcached/memcached_log.txt
# memcached_home: /etc/memcached
# chkconfig: 35 21 79
# description: Start and stop memcached Service

# Source function library
. /etc/rc.d/init.d/functions

RETVAL=0

prog="memcached"
basedir=/usr/local/memcached
cmd=${basedir}/bin/memcached
pidfile="$basedir/${prog}.pid"
#logfile="$basedir/memcached_log.txt"

# 设置memcached启动参数
ipaddr="192.168.1.101"          # 绑定侦听的IP地址
port="11211"                    # 服务端口
username="root"                 # 运行程序的用户身份
max_memory=64                   # default: 64M | 最大使用内存
max_simul_conn=1024             # default: 1024 | 最大同时连接数
#maxcon=51200
#growth_factor=1.3 # default: 1.25 | 块大小增长因子
#thread_num=6 # default: 4
#verbose="-vv" # 查看详细启动信息
#bind_protocol=binary # ascii, binary, or auto (default)

start() {
echo -n $"Starting service: $prog"
$cmd -d -m $max_memory -u $username -l $ipaddr -p $port -c $max_simul_conn -P $pidfile
RETVAL=$?
echo
[ $RETVAL -eq 0 ] && touch /var/lock/subsys/$prog
}

stop() {
echo -n $"Stopping service: $prog "
run_user=`whoami`
pidlist=`ps -ef | grep $run_user | grep memcached | grep -v grep | awk '{print($2)}'`
for pid in $pidlist
do
# echo "pid=$pid"
kill -9 $pid
if [ $? -ne 0 ]; then
return 1
fi
done
RETVAL=$?
echo
[ $RETVAL -eq 0 ] && rm -f /var/lock/subsys/$prog
}

# See how we were called.
case "$1" in
start)
start
;;
stop)
stop
;;
#reload)
# reload
# ;;
restart)
stop
start
;;
#condrestart)
# if [ -f /var/lock/subsys/$prog ]; then
# stop
# start
# fi
# ;;
status)
status memcached
;;
*)
echo "Usage: $0 {start|stop|restart|status}"
exit 1
esac
exit $RETVAL

设置脚本可被执行：

 chmod +x memcached
 chkconfig --add memcached
 chkconfig --level 35 memcached on

查看memcached是否启动：

 ps -ef | grep memcached

设置防火墙

vi /etc/sysconfig/iptables

将下面这行加入进去(注：将memcached加入到防火墙允许访问规则中)

-A RH-Firewall-l-INPUT -p tcp -m tcp --dport 11211 -j ACCEPT

防火墙重启

service iptables restart 

连接到 memcached

telnet localhost 11211

输入stats，会输出memcache的一些连接信息，包括PID
如果需要退出，则执行quit命令即可
memcached进程ID，很重要，如果我们需要关闭memcached服务时，就可以执行命令，kill -9进程号 即可

基本 memcached 客户机命令
您将使用五种基本 memcached 命令执行最简单的操作。这些命令和操作包括：

1. set
2. add
3. replace
4. get
5. delete

=====================================================================

Java测试

下载Java客户端
https://github.com/gwhalin/Memcached-Java-Client

=========================================================
测试 1K
insertData(1,1000*64); success!耗时：7675
STAT 1:chunk_size 80
STAT 1:chunks_per_page 13107
STAT 1:total_pages 5
STAT 1:total_chunks 65535
STAT 1:used_chunks 64000
STAT 1:free_chunks 1535
STAT 1:free_chunks_end 0
STAT 1:mem_requested 4212890
STAT 1:get_hits 0
STAT 1:cmd_set 64000
STAT 1:delete_hits 0
STAT 1:incr_hits 0
STAT 1:decr_hits 0
STAT 1:cas_hits 0
STAT 1:cas_badval 0
STAT 1:touch_hits 0
STAT active_slabs 1
STAT total_malloced 5242800

insertData(10,100*64); success!耗时：1946
STAT 1:chunk_size 80
STAT 1:chunks_per_page 13107
STAT 1:total_pages 5
STAT 1:total_chunks 65535
STAT 1:used_chunks 64000
STAT 1:free_chunks 1535
STAT 1:free_chunks_end 0
STAT 1:mem_requested 4212890
STAT 1:get_hits 0
STAT 1:cmd_set 70400
STAT 1:delete_hits 0
STAT 1:incr_hits 0
STAT 1:decr_hits 0
STAT 1:cas_hits 0
STAT 1:cas_badval 0
STAT 1:touch_hits 0
STAT active_slabs 1
STAT total_malloced 5242800

insertData(100,10*64); success!耗时：406
STAT 1:chunk_size 80
STAT 1:chunks_per_page 13107
STAT 1:total_pages 5
STAT 1:total_chunks 65535
STAT 1:used_chunks 64000
STAT 1:free_chunks 1535
STAT 1:free_chunks_end 0
STAT 1:mem_requested 4212890
STAT 1:get_hits 0
STAT 1:cmd_set 71040
STAT 1:delete_hits 0
STAT 1:incr_hits 0
STAT 1:decr_hits 0
STAT 1:cas_hits 0
STAT 1:cas_badval 0
STAT 1:touch_hits 0
STAT active_slabs 1
STAT total_malloced 5242800

insertData(1000,1*64); success!耗时：56
STAT 1:chunk_size 80
STAT 1:chunks_per_page 13107
STAT 1:total_pages 5
STAT 1:total_chunks 65535
STAT 1:used_chunks 64000
STAT 1:free_chunks 1535
STAT 1:free_chunks_end 0
STAT 1:mem_requested 4212890
STAT 1:get_hits 0
STAT 1:cmd_set 71104
STAT 1:delete_hits 0
STAT 1:incr_hits 0
STAT 1:decr_hits 0
STAT 1:cas_hits 0
STAT 1:cas_badval 0
STAT 1:touch_hits 0
STAT active_slabs 1
STAT total_malloced 5242800

开始测试…
set success!耗时：8191
get success!耗时：4411
开始测试…
set success!耗时：545
get success!耗时：386
开始测试…
set success!耗时：48
get success!耗时：36
开始测试…
set success!耗时：5
get success!耗时：3

STAT pid 18869
STAT uptime 104
STAT time 1405923953
STAT version 1.4.20
STAT libevent 1.4.14b-stable
STAT pointer_size 32
STAT rusage_user 1.197817
STAT rusage_system 2.439629
STAT curr_connections 5
STAT total_connections 12
STAT connection_structures 11
STAT reserved_fds 20
STAT cmd_get 71104
STAT cmd_set 71104
STAT cmd_flush 0
STAT cmd_touch 0
STAT get_hits 71104
STAT get_misses 0
STAT delete_misses 0
STAT delete_hits 0
STAT incr_misses 0
STAT incr_hits 0
STAT decr_misses 0
STAT decr_hits 0
STAT cas_misses 0
STAT cas_hits 0
STAT cas_badval 0
STAT touch_hits 0
STAT touch_misses 0
STAT auth_cmds 0
STAT auth_errors 0
STAT bytes_read 3233311
STAT bytes_written 3316748
STAT limit_maxbytes 67108864
STAT accepting_conns 1
STAT listen_disabled_num 0
STAT threads 4
STAT conn_yields 0
STAT hash_power_level 16
STAT hash_bytes 262144
STAT hash_is_expanding 0
STAT malloc_fails 0
STAT bytes 4881036
STAT curr_items 71104
STAT total_items 71104
STAT expired_unfetched 0
STAT evicted_unfetched 0
STAT evictions 0
STAT reclaimed 0
STAT crawler_reclaimed 0