Trying to understand I/O nomenclature

Discussion in 'other software & services' started by bellgamin, Nov 10, 2010.

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  1. bellgamin

    bellgamin Very Frequent Poster

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    Trying to understand Process Explorer's I/O data

    I use Process Explorer (PE) as my Task Manager. In selecting columns for PE to show on its display, I want to have 1 or 2 columns for tracking I/O.

    In the list of columns for I/O (read, write, etc) I notice that there are columns such as (for example) "I/O Reads" and "I/O Delta Reads". From my physics 401 course, I recall that the "delta" referred to "change." Even so, I do not fully understand terms such as following examples:

    1- Difference between I/O Reads vs I/O Delta Reads?

    2- Difference between I/O Writes vs I/O Write Bytes?

    3- What is the "other" in I/O Other?

    Help/comments will be muchly appreciated.
     
    Last edited: Nov 11, 2010
  2. bellgamin

    bellgamin Very Frequent Poster

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    Is anyone knowledgeable in this area? If so, please help.
     
  3. Tarnak

    Tarnak Registered Member

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  4. bellgamin

    bellgamin Very Frequent Poster

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    A great read. Thanks!

    Based on Tarnak's link & other resources here is a compilation of what I found concerning Process Explorer's I/O data:

    I/O Columns of Process Explorer

    I/O Delta - The change in I/O operations since the last measurement

    I/O Delta Bytes - The change in I/O bytes since the last measurement.

    I/O Other - The number of input/output operations generated by a process that are neither reads nor writes, including file, network, and device I/Os. An example of this type of operation would be a control function. I/O Others directed to CONSOLE (console input object) handles are not counted.

    I/O Other Bytes - The number of bytes transferred in input/output operations generated by a process that are neither reads nor writes, including file, network, and device I/Os. An example of this type of operation would be a control function. I/O Other Bytes directed to CONSOLE (console input object) handles are not counted.

    I/O Read Bytes - The number of bytes read in input/output operations generated by a process, including file, network, and device I/Os. I/O Read Bytes directed to CONSOLE (console input object) handles are not counted.

    I/O Reads - The number of read input/output operations generated by a process, including file, network, and device I/Os. I/O Reads directed to CONSOLE (console input object) handles are not counted.

    I/O Write Bytes - The number of bytes written in input/output operations generated by a process, including file, network, and device I/Os. I/O Write Bytes directed to CONSOLE (console input object) handles are not counted.

    I/O Writes - The number of write input/output operations generated by a process, including file, network, and device I/Os. I/O Writes directed to CONSOLE (console input object) handles are not counted.
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    If you want to use Process Explorer (PE) to find the processes that are mostly responsible for causing your HD to be very busy, then:

    1- Enable PE's column "I/O Delta Total Bytes"

    2- Click on the column header for I/O Delta Total Bytes and the processes causing lots of HD activity will jump to the top of the column.
     
    Last edited: Nov 16, 2010
  5. stapp

    stapp Global Moderator

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    Bellgamin do you mean the process causing the HD activity will jump to the top of the 'delta total bytes' column, or just to the top of the PE page?

    I ask I having allowed the Dela bytes' column but the column seems blank
     
  6. Tarnak

    Tarnak Registered Member

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    You're welcome. :)

    Thanks for the additional information.

    I did bit more exploring and found this related info on performance:


    "The Computer Performance Shell Game"

    1.CPU
    2.Disk
    3.Network
    4.Memory

    "At any given moment, your computer is waiting for some operation to complete on one of these resources. But which one: CPU, memory, disk, or network? If you're interested in performance,..."

    http://www.codinghorror.com/blog/2009/03/the-computer-performance-shell-game.html
     
  7. bellgamin

    bellgamin Very Frequent Poster

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    When you first click the delta column head, the processes using high I/O will go to the bottom. Click that column header again & they will come to the top of the delta bytes column. This will cause all other columns to be re-ordered the same as the order in the delta bytes column.

    To return to normal order, click the "Process" column header. The Process column has 2 optional layouts. You can alternate between the 2 by clicking the Process column head.

    If the delta bytes column is blank, I have no idea why. In my experience, there is always some sort of HD activity going on.
     
  8. stapp

    stapp Global Moderator

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    Works as you say on my XP. The one I couldn't see it on was Win7 64bit.

    Will have another fiddle around :)
     
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