# proc_stat

## NAME



           /proc/stat - kernel system statistics
    


## DESCRIPTION



           _/proc/stat_
                  kernel/system statistics.  Varies with architecture.
                  Common entries include:
    
                  _cpu 10132153 290696 3084719 46828483 16683 0 25195 0 175628_
                  _0_
                  _cpu0 1393280 32966 572056 13343292 6130 0 17875 0 23933 0_
                         The amount of time, measured in units of USER_HZ
                         (1/100ths of a second on most architectures, use
                         _sysconf(_SC_CLK_TCK)_ to obtain the right value),
                         that the system ("cpu" line) or the specific CPU
                         ("cpu _N_ " line) spent in various states:
    
                         _user_   (1) Time spent in user mode.
    
                         _nice_   (2) Time spent in user mode with low priority
                                (nice).
    
                         _system_ (3) Time spent in system mode.
    
                         _idle_   (4) Time spent in the idle task.  This value
                                should be USER_HZ times the second entry in
                                the _/proc/uptime_ pseudo-file.
    
                         _iowait_ (since Linux 2.5.41)
                                (5) Time waiting for I/O to complete.  This
                                value is not reliable, for the following
                                reasons:
    
                                •  The CPU will not wait for I/O to complete;
                                   iowait is the time that a task is waiting
                                   for I/O to complete.  When a CPU goes into
                                   idle state for outstanding task I/O,
                                   another task will be scheduled on this
                                   CPU.
    
                                •  On a multi-core CPU, the task waiting for
                                   I/O to complete is not running on any CPU,
                                   so the iowait of each CPU is difficult to
                                   calculate.
    
                                •  The value in this field may _decrease_ in
                                   certain conditions.
    
                         _irq_ (since Linux 2.6.0)
                                (6) Time servicing interrupts.
    
                         _softirq_ (since Linux 2.6.0)
                                (7) Time servicing softirqs.
    
                         _steal_ (since Linux 2.6.11)
                                (8) Stolen time, which is the time spent in
                                other operating systems when running in a
                                virtualized environment
    
                         _guest_ (since Linux 2.6.24)
                                (9) Time spent running a virtual CPU for
                                guest operating systems under the control of
                                the Linux kernel.
    
                         _guest_nice_ (since Linux 2.6.33)
                                (10) Time spent running a niced guest
                                (virtual CPU for guest operating systems
                                under the control of the Linux kernel).
    
                  _page 5741 1808_
                         The number of pages the system paged in and the
                         number that were paged out (from disk).
    
                  _swap 1 0_
                         The number of swap pages that have been brought in
                         and out.
    
                  _intr 1462898_
                         This line shows counts of interrupts serviced since
                         boot time, for each of the possible system
                         interrupts.  The first column is the total of all
                         interrupts serviced including unnumbered
                         architecture specific interrupts; each subsequent
                         column is the total for that particular numbered
                         interrupt.  Unnumbered interrupts are not shown,
                         only summed into the total.
    
                  _disk_io: (2,0):(31,30,5764,1,2) (3,0):_...
                         (major,disk_idx):(noinfo, read_io_ops, blks_read,
                         write_io_ops, blks_written)
                         (Linux 2.4 only)
    
                  _ctxt 115315_
                         The number of context switches that the system
                         underwent.
    
                  _btime 769041601_
                         boot time, in seconds since the Epoch, 1970-01-01
                         00:00:00 +0000 (UTC).
    
                  _processes 86031_
                         Number of forks since boot.
    
                  _procs_running 6_
                         Number of processes in runnable state.  (Linux
                         2.5.45 onward.)
    
                  _procs_blocked 2_
                         Number of processes blocked waiting for I/O to
                         complete.  (Linux 2.5.45 onward.)
    
                  _softirq 229245889 94 60001584 13619 5175704 2471304 28_
                  _51212741 59130143 0 51240672_
                         This line shows the number of softirq for all CPUs.
                         The first column is the total of all softirqs and
                         each subsequent column is the total for particular
                         softirq.  (Linux 2.6.31 onward.)
    


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