# proc_stat - kernel system statistics - man(5) - [phpMan]

[_proc_stat_(5)](https://www.chedong.com/phpMan.php/man/procstat/5/markdown)                             File Formats Manual                            [_proc_stat_(5)](https://www.chedong.com/phpMan.php/man/procstat/5/markdown)

## 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 run‐
                               ning 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  inter‐
                     rupts 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 on‐
                     ward.)

              _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)](https://www.chedong.com/phpMan.php/man/proc/5/markdown)

Linux man-pages 6.7                          2023-08-15                                 [_proc_stat_(5)](https://www.chedong.com/phpMan.php/man/procstat/5/markdown)