Question: In Task Manager (and Sysinternals’ Process Explorer) there are columns called “I/O Reads”, “I/O Writes”, “I/O Read Bytes” and “I/O Write Bytes”. So what do these counters mean exactly? What else, besides disk and network activity, do they include?
In Process Explorer I see a number of processes which have zero “Disk Read Bytes” and “Network Receive Bytes”, but a non-zero “I/O Read Bytes”. And conversely, some processes have a “Disk Read Bytes” value larger than “I/O Read Bytes”. How is this possible?
Answer:
How is it possible that I have a process with 4 MiB “I/O Read Bytes” and zero “Disk Read Bytes”?
I/O Read Bytes is more than just Disk Read Bytes:
- It includes File, Network and Device I/O
- It does not include Console I/O
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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.
What does I/O data mean?
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I/O Columns of Process Explorer
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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.
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Source Trying to understand Process Explorer’s I/O data