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Linux系统监控与性能优化(详细)

  • 2026-03-21 05:43:12
Linux系统监控与性能优化(详细)

      在Linux系统管理中,你是否曾经遇到过系统运行缓慢、资源占用过高、或者性能瓶颈难以定位的问题?
      系统监控与性能优化是Linux系统管理的重要技能,掌握这些技能不仅能保证系统稳定运行,还能提高工作效率。
      本文将详细介绍Linux系统监控的核心命令和性能优化技巧。

目录

  1. 1. 系统资源监控
  2. 2. 进程监控
  3. 3. 性能优化

1. 系统资源监控

1.1 CPU监控

top命令监控



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# 实时监控CPU使用
top

# 按CPU使用率排序
top -o cpu

# 设置刷新间隔
top -d 5


vmstat命令



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# 查看系统资源使用
vmstat 1

# 查看CPU详细信息
vmstat -c 1


htop命令



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# 交互式监控
htop

# 按CPU排序
F6 → CPU


1.2 内存监控

free命令



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# 查看内存使用
free -h

# 查看内存详细信息
free -m

# 查看内存使用趋势
watch free -h


内存分析



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# 查看内存使用情况
cat /proc/meminfo

# 查看内存映射
cat /proc/PID/maps


1.3 磁盘I/O监控

iostat命令



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# 查看磁盘I/O使用
iostat -xz 1

# 查看磁盘详细信息
iostat -d -x -k 1


df命令



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# 查看磁盘使用
df -h

# 查看inode使用
df -i


1.4 网络监控

netstat命令



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# 查看网络连接
netstat -an

# 查看监听端口
netstat -ln

# 查看进程ID
netstat -p


ss命令



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# 查看网络连接
ss -tulpn

# 查看TCP连接
ss -t


2. 进程监控

2.1 进程查看

ps命令



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# 查看当前进程
ps

# 查看所有进程
ps -ef

# 查看进程详细信息
ps -aux


pgrep命令



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# 查找进程
pgrep nginx

# 查找进程并显示PID
pgrep -l nginx


pstree命令



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# 查看进程树
pstree

# 显示PID
pstree -p


2.2 进程控制

kill命令



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# 终止进程
kill PID

# 强制终止进程
kill -9 PID

# 终止所有同名进程
killall nginx


nice命令



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# 调整进程优先级
nice -n -5 command

# 修改已运行进程的优先级
renice -n 10 PID


2.3 进程调度

screen命令



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# 创建新会话
screen -S session_name

# 查看所有会话
screen -ls

# 恢复会话
screen -r session_name


tmux命令



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# 创建新会话
tmux new -s session_name

# 查看所有会话
tmux ls

# 附加会话
tmux attach -t session_name


3. 性能优化

3.1 CPU优化

CPU调度优化



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# 查看CPU调度策略
cat /sys/block/sda/queue/scheduler

# 调整CPU调度策略
echo "deadline" > /sys/block/sda/queue/scheduler

# 调整CPU频率
cpufreq-set -g performance

# 调整CPU亲和性
taskset -c 0-3 command


进程优先级调整



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# 查看进程优先级
ps -eo pid,ppid,cmd,pri,ni

# 调整进程优先级
renice -n -10 PID

# 设置实时优先级
chrt -f 50 PID


3.2 内存优化

内存参数调优



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# 调整内存使用策略
echo "1" > /proc/sys/vm/swappiness

# 调整内存缓存
echo "50" > /proc/sys/vm/vfs_cache_pressure

# 调整内存分配策略
echo "0" > /proc/sys/vm/overcommit_memory


内存限制设置



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# 设置内存限制
ulimit -v 1048576  # 限制为1GB

# 设置进程内存限制
prlimit --as=1073741824 command


3.3 磁盘I/O优化

磁盘参数调优



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# 调整磁盘队列长度
echo "512" > /sys/block/sda/queue/nr_requests

# 调整预读大小
echo "8192" > /sys/block/sda/queue/read_ahead_kb

# 调整调度策略
echo "noop" > /sys/block/sda/queue/scheduler


文件系统优化



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# 调整挂载选项
mount -o noatime,nodiratime /dev/sda1 /mnt

# 启用延迟写入
mount -o data=writeback /dev/sda1 /mnt

# 启用压缩
mount -o compress /dev/sda1 /mnt


3.4 网络优化

网络参数调优



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# 调整TCP窗口大小
echo "net.core.rmem_max = 16777216" >> /etc/sysctl.conf
echo "net.core.wmem_max = 16777216" >> /etc/sysctl.conf

# 调整TCP缓冲区
echo "net.ipv4.tcp_rmem = 4096 87380 16777216" >> /etc/sysctl.conf
echo "net.ipv4.tcp_wmem = 4096 65536 16777216" >> /etc/sysctl.conf

# 调整TCP连接数
echo "net.core.somaxconn = 65535" >> /etc/sysctl.conf

# 应用配置
sysctl -p


网络接口优化



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# 调整MTU
ifconfig eth0 mtu 9000

# 调整网卡队列长度
ethtool -G eth0 rx 4096 tx 4096

# 启用网卡多队列
ethtool -L eth0 combined 8


总结

Linux系统监控与性能优化是系统管理的重要技能,掌握这些技能不仅能保证系统稳定运行,还能提高工作效率。通过本文的学习,你应该已经掌握了系统资源监控、进程监控、性能优化等核心技能。

关键要点回顾

  1. 1. 系统监控:掌握top、vmstat、iostat、netstat等监控命令
  2. 2. 进程监控:熟练使用ps、pgrep、pstree等进程查看工具
  3. 3. 性能优化:了解CPU、内存、磁盘、网络的优化技巧
  4. 4. 参数调优:掌握系统参数的调整方法
  5. 5. 工具使用:学会使用各种性能优化工具

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  1. CONNECT:[ UseTime:0.000451s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000555s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000321s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.001911s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000538s ]
  6. SELECT * FROM `set` [ RunTime:0.000851s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000589s ]
  8. SELECT * FROM `article` WHERE `id` = 479643 LIMIT 1 [ RunTime:0.001512s ]
  9. UPDATE `article` SET `lasttime` = 1774593962 WHERE `id` = 479643 [ RunTime:0.011923s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 67 LIMIT 1 [ RunTime:0.000289s ]
  11. SELECT * FROM `article` WHERE `id` < 479643 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000980s ]
  12. SELECT * FROM `article` WHERE `id` > 479643 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000620s ]
  13. SELECT * FROM `article` WHERE `id` < 479643 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.003716s ]
  14. SELECT * FROM `article` WHERE `id` < 479643 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001410s ]
  15. SELECT * FROM `article` WHERE `id` < 479643 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.005181s ]
0.100777s