/proc/stat
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Internal
Overview
A file containing kernel/system statistics.
Example
cpu 51867872 12504 17293071 1007053375 43884956 0 734997 28476 0 0 cpu0 26424972 5655 8522768 507855710 17916771 0 160989 12217 0 0 cpu1 25442899 6848 8770302 499197664 25968185 0 574008 16259 0 0 intr 5629954620 57 10 0 0 1010 0 3 0 0 0 26 0 15 0 0 0 0 0 0 0 0 0 0 0 0 59505018 0 1142434 0 24 0 311547405 5895 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 ctxt 8988684252 btime 1499371654 processes 7911606 procs_running 1 procs_blocked 0 softirq 3871680971 7 1707177643 34840 444108079 0 0 12422 745916301 0 974431679
Contents
cpu[ID] user nice system idle iowait page swap
"cpu" lines contain a list of values representing the amount of time, measured in units of USER_HZ that the system spent in various states. There is a cumulative "cpu" statistics line and immediately after it, lines containing the same values for each processor available in the system ("cpu0", "cpu1", etc.).
- user - time in USER_HZ units spent executing code in user mode.
- nice - time in USER_HZ units spent in user mode with low priority (nice).
- system - time in USER_HZ units spent in system mode: kernel executing system calls on behalf of processes.
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:
1. 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.
2. 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.
3. The value in this field may decrease in
certain conditions.
irq (since Linux 2.6.0-test4)
(6) Time servicing interrupts.
softirq (since Linux 2.6.0-test4)
(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.)