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    The following form allows you to view linux man pages.

    Command:

    vmstat

    
    
    

    SYNOPSIS

           vmstat [-a] [-n] [-t] [-S unit] [delay [ count]]
           vmstat [-s] [-n] [-S unit]
           vmstat [-m] [-n] [delay [ count]]
           vmstat [-d] [-n] [delay [ count]]
           vmstat [-p disk partition] [-n] [delay [ count]]
           vmstat [-f]
           vmstat [-V]
    
    
    

    DESCRIPTION

           vmstat  reports  information about processes, memory, paging, block IO,
           traps, and cpu activity.
    
           The first report produced gives averages since the last reboot.   Addi-
           tional  reports  give information on a sampling period of length delay.
           The process and memory reports are instantaneous in either case.
    
       Options
           The -a switch displays active/inactive memory, given a 2.5.41 kernel or
           better.
    
           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, depending on thread usage.  This display does not repeat.
    
           The -t switch adds timestamp to the output.
    
           The -m switch displays slabinfo.
    
           The -n switch causes the header to be displayed only once  rather  than
           periodically.
    
           The  -s  switch  displays  a table of various event counters and memory
           statistics. This display does not repeat.
    
           delay is the delay between updates in seconds.  If no delay  is  speci-
           fied, only one report is printed with the average values since boot.
    
           count  is the number of updates.  If no count is specified and delay is
           defined, count defaults to infinity.
    
           The -d reports disk statistics (2.5.70 or above required)
    
           The -w enlarges field width for big memory sizes
    
           The -p followed by some partition name for detailed statistics  (2.5.70
           or above required)
    
           The  -S  followed  by  k  or K or m or M switches outputs between 1000,
           1024, 1000000, or 1048576 bytes
           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 (/s).
           so: Amount of memory swapped to disk (/s).
    
       IO
           bi: Blocks received from a block device (blocks/s).
           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
           These are percentages of total 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
           pslab: Number of pages per slab
    
    
    

    NOTES

           vmstat does not require special permissions.
    
           These reports are intended to help identify system bottlenecks.   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.
    
           Since procps 3.1.9, vmstat lets you choose units (k, K, m,  M)  default
           is K (1024 bytes) in the default mode
    
           vmstat uses slabinfo 1.1    FIXME
    
    
    

    FILES

           /proc/meminfo
           /proc/stat
           /proc/*/stat
    
    
    

    SEE ALSO

           iostat(1), sar(1), mpstat(1), ps(1), top(1), free(1)
    
    
    

    BUGS

           Does not tabulate the block io per device or count the number of system
           calls.
    
    
    

    AUTHORS

           Written by Henry Ware <al172@yfn.ysu.edu>.
           Fabian Frederick <ffrederick@users.sourceforge.net> (diskstat, slab, partitions...)
    
    
    

    Throatwobbler Ginkgo Labs 27 July 1994 VMSTAT(8)

    
    
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