NAME
vmstat - Report virtual memory statistics
SYNOPSIS
vmstat [option ...] [delay [count]]
DESCRIPTION
vmstat reports information about processes, memory, paging, block IO, traps, disks and cpu activity.
The first report produced gives averages since the last reboot. Additional reports give information on a sampling pe‐
riod of length delay. The process and memory reports are instantaneous in either case.
OPTIONS
delay The delay between updates in seconds. If no delay is specified, only one report is printed with the average
values since boot.
count Number of updates. In absence of count, when delay is defined, default is infinite.
-a, --active
Display active and inactive memory, given a 2.5.41 kernel or better.
-f, --forks
The -f switch displays the number of forks since boot. This includes the fork, vfork, and clone system calls,
and is equivalent to the total number of tasks created. Each process is represented by one or more tasks, de‐
pending on thread usage. This display does not repeat.
-m, --slabs
Displays slabinfo.
-n, --one-header
Display the header only once rather than periodically.
-s, --stats
Displays a table of various event counters and memory statistics. This display does not repeat.
-d, --disk
Report disk statistics (2.5.70 or above required).
-D, --disk-sum
Report some summary statistics about disk activity.
-p, --partition device
Detailed statistics about partition (2.5.70 or above required).
-S, --unit character
Switches outputs between 1000 (k), 1024 (K), 1000000 (m), or 1048576 (M) bytes. Note this does not change the
block (bi/bo) fields.
-t, --timestamp
Append timestamp to each line
-w, --wide
Wide output mode (useful for systems with higher amount of memory, where the default output mode suffers from
unwanted column breakage). The output is wider than 80 characters per line.
-y, --no-first
Omits first report with statistics since system boot.
-V, --version
Display version information and exit.
-h, --help
Display help and exit.
man vstat
flatbush:[ruben]:~$ vmstat 1 20
procs -----------memory---------- ---swap-- -----io---- -system-- -------cpu-------
r b swpd free buff cache si so bi bo in cs us sy id wa st gu
2 0 0 14789768 2072 38689652 0 0 5 229 2617 8 13 2 85 0 0 0
1 0 0 14788520 2072 38689688 0 0 0 0 2825 8925 12 2 86 0 0 0
0 0 0 14768436 2072 38689816 0 0 0 100 3207 9295 16 2 82 0 0 0
1 0 0 14767788 2072 38689816 0 0 0 2216 2748 8530 12 3 86 0 0 0
7 1 0 14767236 2072 38689264 0 0 0 984 4323 11886 14 4 82 0 0 0
3 0 0 14763660 2072 38689800 0 0 0 0 2926 9409 14 2 84 0 0 0
1 0 0 14771048 2072 38689800 0 0 0 24 3007 8986 13 2 85 0 0 0
1 0 0 14771056 2072 38689800 0 0 0 0 2897 8855 13 3 84 0 0 0
0 0 0 14765836 2072 38689592 0 0 0 100 4562 12909 17 3 80 0 0 0
1 0 0 14770188 2072 38684968 0 0 0 984 2910 9275 11 2 87 0 0 0
0 0 0 14770188 2072 38684968 0 0 0 0 2751 8651 11 3 86 0 0 0
1 0 0 14770188 2072 38685032 0 0 0 0 2731 8544 13 2 85 0 0 0
4 1 0 14778228 2072 38684816 0 0 0 1040 4315 12324 15 3 82 0 0 0
1 0 0 14768664 2072 38684968 0 0 0 0 2869 9137 12 2 85 0 0 0
0 0 0 14768648 2072 38685032 0 0 0 72 2803 8896 12 3 85 0 0 0
1 0 0 14768540 2072 38685012 0 0 0 0 2719 8531 11 2 87 0 0 0
0 0 0 14765912 2072 38684752 0 0 0 0 4140 11729 13 3 84 0 0 0
1 0 0 14760692 2072 38685028 0 0 0 980 2852 9052 13 3 84 0 0 0
0 0 0 14762616 2072 38685028 0 0 0 152 2707 8480 11 2 87 0 0 0
1 0 0 14768740 2072 38684704 0 0 0 12 2729 8636 11 2 87 0 0 0
flatbush:[ruben]:~$ vmstat 1 4 -d
disk- ------------reads------------ ------------writes----------- -----IO------
total merged sectors ms total merged sectors ms cur sec
sda 235619 4574 11771113 2918690 5954736 246907 606033978 109295953 0 27424
sdc 249 0 9301 5119 0 0 0 0 0 5
sr0 0 0 0 0 0 0 0 0 0 0
sde 0 0 0 0 0 0 0 0 0 0
sdf 0 0 0 0 0 0 0 0 0 0
sdg 0 0 0 0 0 0 0 0 0 0
sdd 262 0 9032 1091 0 0 0 0 0 0
sdb 74 0 2655 444 0 0 0 0 0 0
disk- ------------reads------------ ------------writes----------- -----IO------
total merged sectors ms total merged sectors ms cur sec
sda 235619 4574 11771113 2918690 5954736 246907 606033978 109295953 0 27424
sdc 249 0 9301 5119 0 0 0 0 0 5
sr0 0 0 0 0 0 0 0 0 0 0
sde 0 0 0 0 0 0 0 0 0 0
sdf 0 0 0 0 0 0 0 0 0 0
sdg 0 0 0 0 0 0 0 0 0 0
sdd 262 0 9032 1091 0 0 0 0 0 0
sdb 74 0 2655 444 0 0 0 0 0 0
disk- ------------reads------------ ------------writes----------- -----IO------
total merged sectors ms total merged sectors ms cur sec
sda 235619 4574 11771113 2918690 5954738 246907 606034026 109295953 0 27424
sdc 249 0 9301 5119 0 0 0 0 0 5
sr0 0 0 0 0 0 0 0 0 0 0
sde 0 0 0 0 0 0 0 0 0 0
sdf 0 0 0 0 0 0 0 0 0 0
sdg 0 0 0 0 0 0 0 0 0 0
sdd 262 0 9032 1091 0 0 0 0 0 0
sdb 74 0 2655 444 0 0 0 0 0 0
disk- ------------reads------------ ------------writes----------- -----IO------
total merged sectors ms total merged sectors ms cur sec
sda 235619 4574 11771113 2918690 5954738 246907 606034026 109295953 0 27424
sdc 249 0 9301 5119 0 0 0 0 0 5
sr0 0 0 0 0 0 0 0 0 0 0
sde 0 0 0 0 0 0 0 0 0 0
sdf 0 0 0 0 0 0 0 0 0 0
sdg 0 0 0 0 0 0 0 0 0 0
sdd 262 0 9032 1091 0 0 0 0 0 0
sdb 74 0 2655 444 0 0 0 0 0 0
https://phoenixnap.com/kb/vmstat-command
https://www.linuxbash.sh/post/vmstat-virtual-memory-and-system-stats
Topic: Useful Command of the Day vmstat - Report virtual memory statistics (Read 1316 times)
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