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 ("cpuN" 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.)

SEE ALSO

       proc(5)