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Linux 性能排查:记住这套命令顺序,高 CPU 高内存秒定位(下)

  • 2026-07-03 17:22:04
Linux 性能排查:记住这套命令顺序,高 CPU 高内存秒定位(下)

服务器资源瓶颈是工作中最常见的告警类型之一。CPU飙高、内存占满、负载异常——这些症状可能由代码bug、异常流量、配置错误甚至外部攻击引起。快速准确定位问题根源,是每个Linux使用者的必备技能。本篇作为下篇,下篇将围绕内存问题展开详细排查,从内存使用率分析、缓存占用定位到内存泄漏溯源,带你全面掌握内存性能瓶颈的标准化排查流程。

01
内存问题排查

排查命令整体顺序

命令
含义
1.free
快速查看内存使用概况
2.vmstat
查看虚拟内存统计
3.ps
找出内存占用最高的进程
4.slabtop
内核slab缓存分析

1. free:内存使用概况。快速查看系统物理内存、交换分区使用情况,判断是否内存不足或频繁 Swap。

常用命令:

✅ 常规用法(不同参数对应不同单位)
# 以MB为单位显示系统内存使用情况(无单位后缀,仅数值)free -m 
输出结果:
# 以 GB 为单位显示系统内存使用情况(无单位后缀,仅数值)free -g
# 由系统自动选取单位显示系统的内存使用情况(自动适配单位并带后缀,无需手动换算)free -h
输出结果:
✅  查看详细统计
# 详细显示内存,拆分显示缓存项,将 buffers(内核缓冲区)与 cache(页缓存)分开统计free -w 
输出结果:
✅ 显示总计行
 # 显示内存并统计总和free -t 
输出结果:
✅ 持续监控(每秒刷新)
# 每秒刷新显示内存使用watch -n 1 free -m
输出结果:

2. vmstat:虚拟内存统计。系统级性能监控工具,同时查看内存、Swap、IO、CPU,定位内存瓶颈根源。

常用命令:

基本用法
 # 每5秒刷新系统性能统计vmstat 5
输出结果:
指定采样次数
 # 每隔 1 秒采样 1 次,总共采样 10 次   vmstat 1 10 
输出结果:
显示详细信息(包含所有计数)
 # 显示系统内存/CPU统计详情vmstat -s 
输出结果:
显示slab信息
# 显示内核内存池信息vmstat -m  
输出结果:

3. ps:查看内存占用。按内存占用排序进程,快速锁定占用内存最高的程序,区分虚拟内存与物理内存。

常用命令:

按内存排序
# 按内存降序,显示占用最高的前5个进程ps aux --sort=-%mem | head -5
输出结果:
查看特定用户
# 查看root用户进程,自定义显示资源占用ps -u root -o pid,vsz,rss,pcpu,pmem,comm
输出结果:
计算进程实际物理内存,输出RSS列即为物理内存占用(KB)
# 按内存降序,取前20个进程ps -eo pid,comm,rss --sort=-rss | head -20
输出结果:
转换为MB
# 按内存降序,格式化显示进程内存(单位MB)ps -eo pid,comm,rss --sort=-rss | awk '{printf "%s %s %.2f MB\n", $1, $2, $3/1024}'
输出结果:

4. slabtop:内核缓存。专门分析内核 slab 缓存占用,解决「内存莫名被占满」的内核级问题。

常用命令:

✅按缓存大小排序
# 按缓存数量排序显示内核slab信息slabtop -s c 
输出结果:
✅按活跃对象排序
# 按对象数量排序显示slabslabtop -s a 
输出结果:
✅按对象数量排序
# 按对象数量排序显示slab信息slabtop -s o 
输出结果:
常见缓存解读:
    缓存名称
    核心含义
    dentry_cache
    目录项缓存
    inode_cache
    inode 缓存
    ext4_inode_cache
    ext4 文件系统 inode
    xfs_inode
    XFS inode 缓存
    bdev_cache
    块设备缓存
    vm_area_struct
    虚拟内存区域结构
    END
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    1. CONNECT:[ UseTime:0.000694s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
    2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000562s ]
    3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.004277s ]
    4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.004367s ]
    5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000718s ]
    6. SELECT * FROM `set` [ RunTime:0.000629s ]
    7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001677s ]
    8. SELECT * FROM `article` WHERE `id` = 488824 LIMIT 1 [ RunTime:0.006329s ]
    9. UPDATE `article` SET `lasttime` = 1783149979 WHERE `id` = 488824 [ RunTime:0.010239s ]
    10. SELECT * FROM `fenlei` WHERE `id` = 67 LIMIT 1 [ RunTime:0.000747s ]
    11. SELECT * FROM `article` WHERE `id` < 488824 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.009496s ]
    12. SELECT * FROM `article` WHERE `id` > 488824 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.007584s ]
    13. SELECT * FROM `article` WHERE `id` < 488824 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.032350s ]
    14. SELECT * FROM `article` WHERE `id` < 488824 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.014289s ]
    15. SELECT * FROM `article` WHERE `id` < 488824 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.026123s ]
    0.281828s