vmstat reports information about processes, memory, paging, blockIO, traps, disks and cpu activity.
The first report produced gives averages since the last reboot. Additional reports give information on a sampling period of length delay. The process and memory reports are instantaneous in either case.
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 newer.
-f, --forks
The -f switch displays the number of forks since boot, which 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, depending on thread usage. This display does not repeat.
-m, --slabs
Displays the contents of /proc/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, --partitiondevice
Detailed statistics about partition (kernel 2.5.70 or above required).
-S, --unitcharacter
Switches outputs between 1000 (k), 1024 (K), 1000000 (m), or 1048576 (M) bytes. Note this does not change the swap (si/so) or block (bi/bo) fields.
-V, --version
Display version information and exit.
-h, --help
Display help and exit.
Field Description For VM Mode
Procs:
r
The number of processes waiting for run time.
b
The number of processes in uninterruptible sleep.
Memory:
swpd
The amount of virtual memory used.
free
The amount of idle memory.
buff
The amount of memory used as buffers.
cache
The amount of memory used as cache.
inact
The amount of inactive memory. (-a option).
active
The amount of active memory. (-a option).
Swap:
si
Amount of memory swapped in from disk (per second).
so
Amount of memory swapped to disk (per second).
IO:
bi
Blocks received from a block device (blocks per second).
bo
Blocks sent to a block device (blocks/s).
System:
in
The number of interrupts per second, including the clock.
cs
The number of context switches per second.
CPU: (values expressed in percentages of CPU time)
us
Time spent running non-kernel code. (user time, including nice time)
sy
Time spent running kernel code. (system time)
id
Time spent idle. Prior to Linux 2.5.41, this includes IO-wait time.
wa
Time spent waiting for IO. Prior to Linux 2.5.41, included in idle.
st
Time stolen from a virtual machine. Prior to Linux 2.6.11, unknown.
Field Description For Disk Mode
Reads:
total
Total reads completed successfully
merged
grouped reads (resulting in one I/O)
sectors
Sectors read successfully
ms
milliseconds spent reading
Writes:
total
Total writes completed successfully
merged
grouped writes (resulting in one I/O)
sectors
Sectors written successfully
ms
milliseconds spent writing
IO:
cur
I/O in progress
s
seconds spent for I/O
Field Description For Disk Partition Mode
reads
Total number of reads issued to this partition
read sectors
Total read sectors for partition
writes
Total number of writes issued to this partition
requested writes
Total number of write requests made for partition
Field Description For Slab Mode
cache
Cache name
num
Number of currently active objects
total
Total number of available objects
size
Size of each object
pages
Number of pages with at least one active object
Notes
vmstat does not require special permissions.
Linux vmstat does not count itself as a running process.
All linux blocks are currently 1024 bytes. Old kernels may report blocks as 512 bytes, 2048 bytes, or 4096 bytes.
vmstat lets you choose units: (k, 1000 bytes; K, 1024 bytes; m, 1000000 bytes; M, 1048576 bytes). Default is K in the default mode.
vmstat uses slabinfo 1.1.
Files
/proc/meminfo /proc/stat /proc/*/stat
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vmstat 例子
vmstat
顯示有關系統資源使用情況的統計信息。輸出將類似于以下內容：
procs -----------memory---------- ---swap-- -----io---- -system-- ----cpu----
r b swpd free buff cache si so bi bo in cs us sy id wa
1 0 9336 128468 238072 342704 0 0 2 11 20 104 6 32 62 0
vmstat
Displays statistics about system resource usage. Output will resemble the following:
procs -----------memory---------- ---swap-- -----io---- -system-- ----cpu----
r b swpd free buff cache si so bi bo in cs us sy id wa
1 0 9336 128468 238072 342704 0 0 2 11 20 104 6 32 62 0
vmstat (報告虛擬內存統計信息，并用于幫助識別性能瓶頸)
在類似Unix的操作系統上，vmstat命令報告虛擬內存統計信息，并用于幫助識別性能瓶頸。
On Unix-like operating systems, the vmstat command reports virtual memory statistics and is used to help identify performance bottlenecks.
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1 vmstat 運行系統環境
2 vmstat 描述
3 vmstat 語法
4 vmstat 例子
vmstat 運行系統環境
Unix&Linux
vmstat 描述
vmstat報告有關進程，內存，頁面調度，塊 IO，陷阱，磁盤和cpu活動的信息。
產生的第一個報告給出了自上次重新啟動以來的平均值。其他報告提供有關長度延遲的采樣周期的信息。兩種情況下，進程和內存報告都是即時的。
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 period of length delay. The process and memory reports are instantaneous in either case.
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vmstat 語法
選件
VM模式的字段說明
程序：
記憶：
交換：
IO：
系統：
CPU：（以CPU時間百分比表示的值）
磁盤模式的字段說明
讀：
寫道：
IO：
磁盤分區模式的字段說明
平板模式的字段說明
筆記
vmstat不需要特殊權限。
Linux vmstat不會將自己視為正在運行的進程。
當前所有的Linux塊都是1024字節。舊內核可能報告的塊為512字節，2048字節或4096字節。
vmstat允許您選擇單位：（k，1000字節；K，1024字節；m，1000000字節；M，1048576字節）。在默認模式下，默認值為K。
vmstat使用slabinfo 1.1。
檔案
/ proc / meminfo
/ proc / stat
/ proc / * / stat
Options
Field Description For VM Mode
Procs:
Memory:
Swap:
IO:
System:
CPU: (values expressed in percentages of CPU time)
Field Description For Disk Mode
Reads:
Writes:
IO:
Field Description For Disk Partition Mode
Field Description For Slab Mode
Notes
vmstat does not require special permissions.
Linux vmstat does not count itself as a running process.
All linux blocks are currently 1024 bytes. Old kernels may report blocks as 512 bytes, 2048 bytes, or 4096 bytes.
vmstat lets you choose units: (k, 1000 bytes; K, 1024 bytes; m, 1000000 bytes; M, 1048576 bytes). Default is K in the default mode.
vmstat uses slabinfo 1.1.
Files
/proc/meminfo
/proc/stat
/proc/*/stat
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vmstat 例子
顯示有關系統資源使用情況的統計信息。輸出將類似于以下內容：
Displays statistics about system resource usage. Output will resemble the following:
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其他命令行
visudo | vim\gview\gvim | vacation | vgrind | vipw | vi |