thomasabishop/eolas
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

Last Sync: 2022-09-05 13:30:04

Browse source
This commit is contained in:
tactonbishop 2022-09-05 13:30:04 +01:00
parent ed3e2aafba
commit 654fddb3de
1 changed files with 39 additions and 23 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

62
Linux/Monitoring_processes_and_resources.md
View file

@ -53,6 +53,45 @@ _Here I have pressed `u` to show only the processes associated with my user:_
- R for running
- D for disk sleep
### `vmstat`
`vmstat` provides similar metrics to `htop` but tells you more about the memory state and the activities of the kernel in a single row.
The default output is a single line with the averages since boot. You can add a delay parameter (in secs) which will then output at that interval, allowing you to see memory usage in realtime, e.g:
```
$ vmstat 5
procs -----------memory---------- ---swap-- -----io---- -system-- ------cpu-----
r b swpd free buff cache si so bi bo in cs us sy id wa st
2 0 0 4326768 334228 5050952 0 0 8 19 80 10 4 1 94 0 0
0 0 0 4365520 334260 5054468 0 0 0 125 2140 3434 4 1 94 0 0
1 0 0 4382400 334276 5068940 0 0 0 77 2102 3988 3 1 95 0 0
1 0 0 4434000 334288 5052908 0 0 0 25 2859 4278 6 1 92 0 0
0 0 0 4391576 334304 5086484 0 0 0 110 2899 6480 8 3 90 0 0
```
- `procs`
- The number of runnable processes (`r`) and the number of blocked (`b`) processes
- `memory`
- The core memory output distinguishing:
- Total kbs swapped to disk
- Total kbs free
- Total kbs currently in [buffer](/Hardware/Memory/Role_in_computation.md#relation-between-cache-and-buffers) and not written
- Total amount of virtual memory in the [cache](/Hardware/Memory/Role_in_computation.md#relation-between-cache-and-buffers)
- `swap`
- Distinguishes amount of memory [swapped](/Operating_Systems/Disks/Swap_space.md) in (`si`) to memory and swapped out (`so`) to disk
- `io`
- Disk actions
- Amount of data read from harddisk (`bi`)
- Amount of data written to harddisk (`bo`)
- `system`
- The number of times the kernel switches to kernel code
- `cpu`
- Percentage of the different CPU behaviours:
- Responding to user tasks (`us`)
- Time that it is idle (`id`)
## 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:
@ -105,26 +144,3 @@ $ free
Mem: 16099420 5931512 5039344 2046460 5128564 7781904
Swap: 3145724 0 3145724
```
### `vmstat` : virtual memory statistics
Pretty much the same as `free` but in the context of virtual memory. It also distinguishes between buffer and cache.
The default output is a single line with the averages since boot. You can add a delay parameter (in secs) which will then output at that interval, allowing you to see memory usage in realtime, e.g:
```
$ vmstat 5
procs -----------memory---------- ---swap-- -----io---- -system-- ------cpu-----
r b swpd free buff cache si so bi bo in cs us sy id wa st
2 0 0 4326768 334228 5050952 0 0 8 19 80 10 4 1 94 0 0
0 0 0 4365520 334260 5054468 0 0 0 125 2140 3434 4 1 94 0 0
1 0 0 4382400 334276 5068940 0 0 0 77 2102 3988 3 1 95 0 0
1 0 0 4434000 334288 5052908 0 0 0 25 2859 4278 6 1 92 0 0
0 0 0 4391576 334304 5086484 0 0 0 110 2899 6480 8 3 90 0 0
```
- `r` stands for the number of runnable processes
- `b` stands for the number of blocked processes: those waiting for I/O to complete before proceeding.
- `si/so`: the amount of memory swapped in (from disk) and swapped out (to disk)
- `bi/ bo`: the amount of blocks received from a device (`bi`), the amoung of blocks sent to a device (`bo`)