本文共 1675 字，大约阅读时间需要 5 分钟。
介绍
memkeys是tumblr开源的类似top的工具,可用于实时查看memcached的key使用情况。
安装
安装autoconf(要求版本2.68以上):
| 1 2 3 4 5 | # wget -c http://ftp.gnu.org/gnu/autoconf/autoconf-latest.tar.gz # tar zxvf autoconf-latest.tar.gz # cd autoconf-2.69 # ./configure # make && make install |
安装其它依赖:
| 1 | # yum install libpcap-devel pcre-devel ncurses-devel |
安装memkeys:
| 1 2 3 4 5 | # git clone https://github.com/tumblr/memkeys.git # cd memkeys # ./autogen.sh # ./configure # make && make install |
使用
| 1 | # memkeys -h |
| 1 2 3 4 5 6 7 8 9 10 | Usage: memkeys -i NIC [options] -d, --discard=THRESH Discard keys where req/s rate is below THRESH -i, --interface=NIC Network interface to capture traffic on (required) -p, --port=PORT Network port to capture memcache traffic on (default 11211) -r, --refresh=INTERVAL Refresh the stats display every INTERVAL ms (default 500) -l, --logfile=FILE Output logs to FILE -R, --report=REPORT Output data in REPORT format (CSV or curses, default curses) -h, --help This help -v, --verbose Increase verbosity. May be used multiple times. -V, --version Show program info and exit. |
捕获eth0上memcached的key的使用情况，记录日志到/tmp/memkeys.log：
| 1 | memkeys -i eth0 -l /tmp/memkeys .log |
显示结果类似如下：
| 1 2 3 4 5 6 | memcache key calls objsize req/sec bw(kbps) username 1 12 0.14 0.01 key12 1 6 0.07 0.00 key10 1 6 0.06 0.00 sort mode: reqrate (desc) keys: 3 packets (recv/dropped): 24 / 0 (0.00%) rt: 1 (ms) B:sort by bandwidth | C:sort by calls | Q:quit | R:sort by req/sec | S:sort by size | T:toggle sort order (asc|desc) |
当你在一个很大网络流量的机器上运行memkeys，需要定义一个每秒请求量的阈值，过滤掉req/sec小于指定的值，否则内存空间占用将会增长得相当大。
| 1 | memkeys -i eth0 -d 10.0 -l /tmp/memkeys .log |