Linux Performance Monitoring with Vmstat and Iostat Commands

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Ravi Saive

Simple Word a Computer Geek and Linux Guru who loves to share tricks and tips on Internet. Most Of My Servers runs on Open Source Platform called Linux.

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13 Responses

  1. Raghu says:

    what does iostat -k 10 means, and please any body let me know

  2. Markus Aurelius says:

    You wrote :

    Free – Amount of free/idle memory spaces.

    But can you tell me what exactly you mean by “Amount”?

    Is it COUNT OF TOTAL FREE PAGE BLOCKS (In most case 1 Page Block = 4096 Bits)

    or measured in MBytes or Mbits Or KByes or Kbits ??

    Please clarify?

    How would your calculate free memory in Mega Bits?
    Replay Must.

  3. Amar Tiwari says:

    Hello Sir,

    I want to know that how can we know bottelneck by looking these output. Please tell me according to CPU, Memory and HDD.

    Thanks for reply.

  4. Krishna says:

    Just to mention, vmstat is not from package sysstat, it is from procps

  5. Pavan says:

    Can we show only vmstat cpu? If so, how?

  6. Mark says:

    I have a question.
    I wanted to print vmstat with timestamp on LinuxMint 13 with bash shell but seems your
    command

    vmstat -t

    does not works. It says there is no such argument as -t.
    Is there other command for vmstat on OS like Linux Mint/Ubuntu which i can use to print vmstat with Timestamp.

    I know it works for AIX but not for LM/Ubuntu. :S

  7. quydo says:

    @YM:

    iostat -d 5 | tee -a monitor.txt

    Log will appear in screen and save to monitor.txt simultaneously :D

  8. YM says:

    Thank you.

    Was able to write io logs, but when tried the same, i get “netstat: extra arguements”, but when tried netstat -a, logs were written into a file.

    Please advice me on how to overcome this?

    Thanks in advance.

  9. YM says:

    i need to monitor iostat and netstat for the app server, i need to monitor it for a particular time period with a time interval of 5 sec and write these logs to a particular file. am not sure of how do i do that. please gice suggestions.

    • Ravi Saive says:

      Do that this way, The below command append output to file “monitor.txt” every 5 seconds.

      # iostat -d 5 >> monitor.txt
      

      Same way do it for netstat.

  10. asd says:

    you made a mistake

    si – Swaped in every second from disk in Kilo Bytes.
    si – Swaped out every second to disk in Kilo Bytes.

    (i think you meant so second time)

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