man > proc_stat(5)

proc_stat(5)                             File Formats Manual                            proc_stat(5)

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 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)

Linux man-pages 6.7                          2023-08-15                                 proc_stat(5)