{"id":1931,"date":"2024-03-07T09:10:02","date_gmt":"2024-03-07T09:10:02","guid":{"rendered":"https:\/\/www.devopsfreelancer.com\/blog\/?p=1931"},"modified":"2024-03-07T09:10:06","modified_gmt":"2024-03-07T09:10:06","slug":"linux-commands-to-troubleshoot-performance-issues","status":"publish","type":"post","link":"https:\/\/www.devopsfreelancer.com\/blog\/linux-commands-to-troubleshoot-performance-issues\/","title":{"rendered":"Linux Commands to Troubleshoot Performance Issues"},"content":{"rendered":"\n

In this tutorial we’re going to learn how to Troubleshoot Performance Issues with the CPU, RAM, disc I\/O, network usage, and general responsiveness of the system. You can use the following popular Linux commands and utilities to troubleshoot performance issues:<\/p>\n\n\n\n

1 nmap Command<\/strong>:<\/h2>\n\n\n\n

Network exploration tool and security scanner.<\/p>\n\n\n\n

nmap -p 1-1000 wizbrand.com<\/code><\/pre>\n\n\n\n
Output:-<\/p>\n\n\n\n
\"\"<\/figure>\n\n\n\n
2.\u00a0sar<\/code>\u00a0(System Activity Reporter):<\/h2>\n\n\n\n
In Unix-like operating systems, the command-line utility sar, or System Activity Reporter, gathers, reports, and saves system activity data. It is used to track system performance data and is a component of the sysstat package. Real-time data on CPU load, memory paging, swap utilisation, network I\/O, and other topics are available from Sar. Additionally, it can show historical data for particular time periods, enabling examination of previous performance problems.<\/p>\n\n\n\n
After installation, sar allows you to view historical data from log files or real-time statistics. For instance, you only need to run sar into the terminal to see the CPU load for the current day. The command sar interval iterations, where interval is the number of seconds between snapshots and iterations is the number of times to produce the statistics, can be used to display real-time statistics.<\/p>\n\n\n\n
The following are some typical sar command options:<\/p>\n\n\n\n
    \n
  • -A<\/code>: All statistics<\/li>\n\n\n\n
  • -b<\/code>: I\/O statistics<\/li>\n\n\n\n
  • -B<\/code>: Swap usage statistics<\/li>\n\n\n\n
  • -d<\/code>: I\/O for each block device<\/li>\n\n\n\n
  • -n ALL<\/code>: All network statistics<\/li>\n\n\n\n
  • -q<\/code>: Processor queue (cache) statistics<\/li>\n\n\n\n
  • -r<\/code>: Memory and swap statistics<\/li>\n\n\n\n
  • -u<\/code>: CPU statistics (default)<\/li>\n\n\n\n
  • -v<\/code>: Kernel statistics<\/li>\n\n\n\n
  • -W<\/code>: Simplified swap statistics<\/li>\n<\/ul>\n\n\n\n
    3. iostat<\/code><\/h2>\n\n\n\n
    Linux users can obtain CPU and input\/output statistics for devices and partitions using the iostat command-line utility. Its purpose is to track the loading of system input\/output devices by measuring the duration of each device\u2019s operation in comparison to its typical transfer rate.<\/p>\n\n\n\n
    Here are some common uses of iostat<\/code> with examples:<\/p>\n\n\n\n
      \n
    • Basic usage<\/strong>: Running iostat<\/code> without any arguments will display CPU and device statistics since the last reboot.<\/li>\n\n\n\n
    • Detailed statistics<\/strong>: Using the -x<\/code> option will show more detailed statistics information.<\/li>\n<\/ul>\n\n\n\n
      iostat -x\n<\/code><\/pre>\n\n\n\n
        \n
      • CPU statistics only<\/strong>: To display only CPU statistics, use the -c<\/code> option.<\/li>\n<\/ul>\n\n\n\n
        iostat -c\n<\/code><\/pre>\n\n\n\n
          \n
        • Device statistics only<\/strong>: The -d<\/code> option will display only the device report.<\/li>\n<\/ul>\n\n\n\n
          iostat -d\n<\/code><\/pre>\n\n\n\n
            \n
          • Extended I\/O statistics for devices<\/strong>: The -xd<\/code> option shows extended I\/O statistics for devices only.<\/li>\n<\/ul>\n\n\n\n
            iostat -xd\n<\/code><\/pre>\n\n\n\n
              \n
            • Statistics in kilobytes or megabytes<\/strong>: The -k<\/code> option captures the statistics in kilobytes, and -m<\/code> captures them in megabytes.<\/li>\n<\/ul>\n\n\n\n
              iostat -k\niostat -m\n<\/code><\/pre>\n\n\n\n
                \n
              • Repetition and delay: You can set a count (the number of times to update) and a delay (the interval between updates). For instance, running iostat -k 2 3 will produce 3 reports and show CPU and device data with a 2-second lag between each report.<\/li>\n<\/ul>\n\n\n\n
                iostat -k  2  3\n<\/code><\/pre>\n\n\n\n
                  \n
                • Persistent device name statistics<\/strong>: The -j<\/code> option allows you to display persistent device name statistics.<\/li>\n<\/ul>\n\n\n\n
                  iostat -j ID mmcbkl0 sda6 -x -m  2  2\n<\/code><\/pre>\n\n\n\n
                    \n
                  • Statistics for block devices<\/strong>: The -p<\/code> option displays statistics for block devices.<\/li>\n<\/ul>\n\n\n\n
                    iostat -p\n<\/code><\/pre>\n\n\n\n
                      \n
                    • LVM2 statistic information<\/strong>: The -N<\/code> option displays LVM2 statistic information.<\/li>\n<\/ul>\n\n\n\n
                      iostat -N<\/code><\/pre>\n\n\n\n
                      4. ifconfig Command<\/strong><\/h2>\n\n\n\n
                      Displays or configures network interfaces.<\/p>\n\n\n\n
                      Example :-<\/p>\n\n\n\n
                      ifconfig<\/code><\/pre>\n\n\n\n
                      5. ip Command<\/strong><\/h2>\n\n\n\n
                      Provides extensive networking information.<\/p>\n\n\n\n
                      Example :-<\/p>\n\n\n\n
                      ip addr show\n<\/code><\/pre>\n\n\n\n
                      6. arp Command<\/strong><\/h2>\n\n\n\n
                      Displays the ARP cache.<\/p>\n\n\n\n
                      Example :-<\/p>\n\n\n\n
                      arp -a\n<\/code><\/pre>\n\n\n\n
                      Output:-<\/p>\n\n\n\n
                      \"\"<\/figure>\n\n\n\n
                      7. route Command<\/strong><\/h2>\n\n\n\n
                      Displays and manipulates the IP routing table.<\/p>\n\n\n\n
                      Example :-<\/p>\n\n\n\n
                      route -n\n<\/code><\/pre>\n\n\n\n
                      Output :-<\/p>\n\n\n\n
                      \"\"<\/figure>\n\n\n\n
                      8. dig Command<\/strong><\/h2>\n\n\n\n
                      Performs DNS lookup and displays the response.<\/p>\n\n\n\n
                      Example :-<\/p>\n\n\n\n
                      dig wizbrand.com\n<\/code><\/pre>\n\n\n\n
                      Output:-<\/p>\n\n\n\n
                      \"\"<\/figure>\n\n\n\n
                      9. host Command<\/strong><\/h2>\n\n\n\n
                      Performs DNS lookup and displays the response.<\/p>\n\n\n\n
                      Example :-<\/p>\n\n\n\n
                      host wizbrand.com<\/code><\/pre>\n\n\n\n
                      Output:-<\/p>\n\n\n\n
                      \"\"<\/figure>\n\n\n\n
                      10. uptime Command<\/strong>:<\/h2>\n\n\n\n
                      Displays system uptime and load average.<\/p>\n\n\n\n
                      Example :-<\/p>\n\n\n\n
                      uptime<\/code><\/pre>\n\n\n\n
                      \"\"<\/figure>\n\n\n\n
                      11. free Command<\/strong><\/h2>\n\n\n\n
                      Displays free and used memory in the system.<\/p>\n\n\n\n
                      free -m\n<\/code><\/pre>\n\n\n\n
                      Output:-<\/p>\n\n\n\n
                      \"\"<\/figure>\n\n\n\n
                      12 df Command<\/strong><\/h2>\n\n\n\n
                      Displays disk space usage.<\/p>\n\n\n\n
                      Example :-<\/p>\n\n\n\n
                      df -h\n<\/code><\/pre>\n\n\n\n
                      \"\"<\/figure>\n\n\n\n
                      13 du Command<\/strong><\/h2>\n\n\n\n
                      Displays disk usage of files and directories.<\/p>\n\n\n\n
                      Example :-<\/p>\n\n\n\n
                      du -sh htdocs<\/code><\/pre>\n\n\n\n
                      Output:-<\/p>\n\n\n\n
                      \"\"<\/figure>\n\n\n\n
                      14. ps Command<\/strong><\/p>\n\n\n\n
                      Displays a snapshot of current processes.<\/h2>\n\n\n\n
                      Example:-<\/p>\n\n\n\n
                      ps aux<\/code><\/pre>\n\n\n\n
                      Output:-<\/p>\n\n\n\n
                      \"\"<\/figure>\n\n\n\n
                      15. top Command<\/strong><\/h2>\n\n\n\n
                      Displays real-time information about system processes and resource usage.<\/p>\n\n\n\n
                      Example:-<\/p>\n\n\n\n
                      top\n<\/code><\/pre>\n\n\n\n
                      Output:-<\/p>\n\n\n\n
                      \"\"<\/figure>\n\n\n\n
                      16 htop Command<\/strong>:<\/h2>\n\n\n\n
                      Interactive process viewer.<\/p>\n\n\n\n
                      Example :-<\/p>\n\n\n\n
                      htop\n<\/code><\/pre>\n\n\n\n
                      Output:-<\/p>\n\n\n\n
                      \"\"<\/figure>\n\n\n\n
                      17. lsof Command<\/strong><\/h2>\n\n\n\n
                      Lists open files and the processes that opened them.<\/p>\n\n\n\n
                      lsof<\/code><\/pre>\n\n\n\n
                      Output:-<\/p>\n\n\n\n
                      \"\"<\/figure>\n\n\n\n
                      18. strace Command<\/strong><\/h2>\n\n\n\n
                      Traces system calls and signals.<\/p>\n\n\n\n
                      strace -p PID\n<\/code><\/pre>\n\n\n\n
                      19. dmesg Command<\/strong><\/h2>\n\n\n\n
                      Displays kernel ring buffer messages<\/p>\n\n\n\n
                      dmesg<\/code><\/pre>\n\n\n\n
                      Output:-<\/p>\n\n\n\n
                      \"\"<\/figure>\n\n\n\n
                      20. journalctl Command<\/strong><\/h2>\n\n\n\n
                      Views system logs (systemd).
                      Example:-<\/p>\n\n\n\n
                      journalctl -xe\n<\/code><\/pre>\n\n\n\n
                      Output:-<\/p>\n\n\n\n
                      \"\"<\/figure>\n\n\n\n
                      21. lsmod Command<\/strong><\/h2>\n\n\n\n
                      Lists loaded kernel modules<\/p>\n\n\n\n
                      Example:-<\/p>\n\n\n\n
                      lsmod\n<\/code><\/pre>\n\n\n\n
                      Output:-<\/p>\n\n\n\n
                      \"\"<\/figure>\n\n\n\n
                      22. tcpdump Command<\/strong><\/h2>\n\n\n\n
                      Captures and displays network packets.<\/p>\n\n\n\n
                      Example:-<\/p>\n\n\n\n
                      tcpdump -i eth0\n<\/code><\/pre>\n\n\n\n
                      Output:-<\/p>\n\n\n\n
                      \"\"<\/figure>\n\n\n\n
                      23. iftop Command<\/strong><\/h2>\n\n\n\n
                      Displays bandwidth usage on an interface.<\/p>\n\n\n\n
                      Example:-<\/p>\n\n\n\n
                      iftop -i eth0\n<\/code><\/pre>\n\n\n\n
                      Output:-<\/p>\n\n\n\n
                      \"\"<\/figure>\n\n\n\n
                      Thanks for reading.\ud83d\udc4d\ud83d\udc4d <\/p>\n","protected":false},"excerpt":{"rendered":"
                      In this tutorial we’re going to learn how to Troubleshoot Performance Issues with the CPU, RAM, disc I\/O, network usage, and general responsiveness of the system. You… <\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[27],"tags":[28,521,744,632],"class_list":["post-1931","post","type-post","status-publish","format-standard","hentry","category-linux","tag-linux","tag-linux-error","tag-linux-improve-issue","tag-linux-performance"],"yoast_head":"\nLinux Commands to Troubleshoot Performance Issues - DevOps Freelancer<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.devopsfreelancer.com\/blog\/linux-commands-to-troubleshoot-performance-issues\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Linux Commands to Troubleshoot Performance Issues - DevOps Freelancer\" \/>\n<meta property=\"og:description\" content=\"In this tutorial we’re going to learn how to Troubleshoot Performance Issues with the CPU, RAM, disc I\/O, network usage, and general responsiveness of the system. 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