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13
Linux/Monitoring_processes_and_resources.md
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@ -25,6 +25,12 @@ _Here I have pressed `u` to show only the processes associated with my user:_
| P | Sort by cumulative CPU usage | | P | Sort by cumulative CPU usage |
| ? | View key and explanation | | ? | View key and explanation |
### Understanding the categories
- `Main/IO`
- The first covers all processes. The second focuses on input/output processes (i.e. reading and writing to disks and other devices)
-
## Files being used by active processes: `lsof` ## Files being used by active processes: `lsof`
`lsof` stands for _list open files_. It lists opened files and the processes using them. Without modifiers it outputs a huge amount of data. The best way to use it is to execute it against a specific PID. For example the below output gives me some useful info about which files VS Code is using: `lsof` stands for _list open files_. It lists opened files and the processes using them. Without modifiers it outputs a huge amount of data. The best way to use it is to execute it against a specific PID. For example the below output gives me some useful info about which files VS Code is using:
@ -71,4 +77,9 @@ This will typically be the same for all Linux systems.
There are two kinds of error that can occur with relation to paged memory: There are two kinds of error that can occur with relation to paged memory:
- - minor page faults
- The desired page is in main memory but the MMU doesn't currently know where it is
- major page faults
- The desired page is not in main memory at all. Therefore the kernel must fetch it from disk
Minor page faults are very common and are to be expected; they resolve quickly. On the other hand too many major page faults can slow the system down both because of the time-costly process of fetching data from disk and because it demands more kernel resources to locate the missing page, which puts other processes on hold.