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 en-
tries 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/up-
time 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 en-
vironment
guest (since Linux 2.6.24)
(9) Time spent running a virtual CPU for guest op-
erating systems under the control of the Linux ker-
nel.
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 in-
cluding unnumbered architecture specific interrupts; each
subsequent column is the total for that particular num-
bered 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 on-
ward.)
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 subse-
quent column is the total for particular softirq. (Linux
2.6.31 onward.)
SEE ALSO
proc(5)
Linux man-pages 6.9.1 2024-05-02 proc_stat(5)
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