/proc/stat

/proc/stat
kernel/system statistics.  Varies with architecture.  Common
entries include:

cpu  3357 0 4313 1362393
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 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.

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).

user (432661) 从系统启动开始累计到当前时刻，用户态的CPU时间（单位：jiffies） ，不包含 nice值为负进程。1jiffies=0.01秒
nice (13295) 从系统启动开始累计到当前时刻，nice值为负的进程所占用的CPU时间（单位：jiffies）
system (86656) 从系统启动开始累计到当前时刻，核心时间（单位：jiffies）
idle (422145968) 从系统启动开始累计到当前时刻，除硬盘IO等待时间以外其它等待时间（单位：jiffies）
iowait (171474) 从系统启动开始累计到当前时刻，硬盘IO等待时间（单位：jiffies） ，
irq (233) 从系统启动开始累计到当前时刻，硬中断时间（单位：jiffies）
softirq (5346) 从系统启动开始累计到当前时刻，软中断时间（单位：jiffies

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.)