通过smem 定时检测系统内存占用情况

目录

• smem 工具介绍
• 编写定时任务脚本
• 配置定时任务
• 配置日志轮转
• 检查定时任务是否生效
• 查看 TOP5 内存占用
• 分析单个进程内存占用趋势

smem 工具介绍

参考1 https://github.com/kwkroeger/smem
参考2https://blog.csdn.net/yueludanfeng/article/details/123075344?ops_request_misc=%257B%2522request%255Fid%2522%253A%2522eccb749764d3040c413f45a51098df04%2522%252C%2522scm%2522%253A%252220140713.130102334.pc%255Fblog.%2522%257D&request_id=eccb749764d3040c413f45a51098df04&biz_id=0&utm_medium=distribute.pc_search_result.none-task-blog-2_blogfirst_rank_ecpm_v1~rank_v31_ecpm-2-123075344-null-null.nonecase&utm_term=smem&spm=1018.2226.3001.4450

编写定时任务脚本

cat > /usr/local/bin/smem.sh <<-"EOF"

if [[ ! -d /var/log/smem ]];then
    mkdir -p /var/log/smem
fi
echo "zzz: start `date +%F_%T`" >> /var/log/smem/smem.log
/usr/local/bin/smem -tk >> /var/log/smem/smem.log
echo "zzz: end `date +%F_%T`" >> /var/log/smem/smem.log
EOF

chmod 755 /usr/local/bin/smem.sh

配置定时任务

echo "" >> /etc/crontab
echo "* * * * * root flock -xn '/tmp/smem.lock' -c '/usr/local/bin/smem.sh' > /dev/null 2>&1" >> /etc/crontab
systemctl reload crond

配置日志轮转

cat >> /etc/logrotate.d/smem <<-"EOF"
/var/log/smem/smem.log {
    daily
    rotate 30
    compress
    delaycompress
    missingok
    notifempty
    create 644 root root
}
EOF

检查定时任务是否生效

# 查看 /var/log/cron
tail -1000 /var/log/cron |grep smem

# 这将显示过去 2 分钟内的 crond 日志条目
journalctl -u crond --since "2 minutes ago" | grep smem

[root@localhost lxm]# tail -1000 /var/log/cron |grep smem
Dec 20 10:13:01 localhost CROND[3378740]: (root) CMD (flock -xn '/tmp/smem.lock' -c '/usr/local/bin/smem.sh' > /dev/null 2>&1)
Dec 20 10:13:01 localhost CROND[3378739]: (root) CMDEND (flock -xn '/tmp/smem.lock' -c '/usr/local/bin/smem.sh' > /dev/null 2>&1)
[root@localhost lxm]# 
[root@localhost lxm]# journalctl -u crond --since "2 minutes ago" | grep smem
Dec 20 10:13:01 localhost.localdomain CROND[3378740]: (root) CMD (flock -xn '/tmp/smem.lock' -c '/usr/local/bin/smem.sh' > /dev/null 2>&1)
Dec 20 10:14:01 localhost.localdomain CROND[3388194]: (root) CMD (flock -xn '/tmp/smem.lock' -c '/usr/local/bin/smem.sh' > /dev/null 2>&1)

查看 TOP5 内存占用

grep zzz:end -B5 /var/log/smem/smem.log >> /root/res.log

分析单个进程内存占用趋势