Each of the following three areas are individually controlled
through one or more interactive commands. See topic 4b. SUMMARY
AREA Commands for additional information regarding these
provisions.
2a. UPTIME and LOAD Averages
This portion consists of a single line containing:
program or window name, depending on display mode
current time and length of time since last boot
total number of users
system load avg over the last 1, 5 and 15 minutes
2b. TASK and CPU States
This portion consists of a minimum of two lines. In an SMP
environment, additional lines can reflect individual CPU state
percentages.
Line 1 shows total tasks or threads, depending on the state of
the Threads-mode toggle. That total is further classified as:
running; sleeping; stopped; zombie
Line 2 shows CPU state percentages based on the interval since
the last refresh.
As a default, percentages for these individual categories are
displayed. Where two labels are shown below, those for more
recent kernel versions are shown first.
us, user : time running un-niced user processes
sy, system : time running kernel processes
ni, nice : time running niced user processes
id, idle : time spent in the kernel idle handler
wa, IO-wait : time waiting for I/O completion
hi : time spent servicing hardware interrupts
si : time spent servicing software interrupts
st : time stolen from this vm by the hypervisor
In the alternate cpu states display modes, beyond the first
tasks/threads line, an abbreviated summary is shown consisting of
these elements:
a b c d
%Cpu(s): 75.0/25.0 100[ ...
Where: a) is the `user' (us + ni) percentage; b) is the `system'
(sy + hi + si) percentage; c) is the total; and d) is one of two
visual graphs of those representations. See topic 4b. SUMMARY
AREA Commands and the `t' command for additional information on
that special 4-way toggle.
2c. MEMORY Usage
This portion consists of two lines which may express values in
kibibytes (KiB) through exbibytes (EiB) depending on the scaling
factor enforced with the `E' interactive command.
As a default, Line 1 reflects physical memory, classified as:
total, free, used and buff/cache
Line 2 reflects mostly virtual memory, classified as:
total, free, used and avail (which is physical memory)
The avail number on line 2 is an estimation of physical memory
available for starting new applications, without swapping.
Unlike the free field, it attempts to account for readily
reclaimable page cache and memory slabs. It is available on
kernels 3.14, emulated on kernels 2.6.27+, otherwise the same as
free.
In the alternate memory display modes, two abbreviated summary
lines are shown consisting of these elements:
a b c
GiB Mem : 18.7/15.738 [ ...
GiB Swap: 0.0/7.999 [ ...
Where: a) is the percentage used; b) is the total available; and
c) is one of two visual graphs of those representations.
In the case of physical memory, the percentage represents the
total minus the estimated avail noted above. The `Mem' graph
itself is divided between used and any remaining memory not
otherwise accounted for by avail. See topic 4b. SUMMARY AREA
Commands and the `m' command for additional information on that
special 4-way toggle.
This table may help in interpreting the scaled values displayed:
KiB = kibibyte = 1024 bytes
MiB = mebibyte = 1024 KiB = 1,048,576 bytes
GiB = gibibyte = 1024 MiB = 1,073,741,824 bytes
TiB = tebibyte = 1024 GiB = 1,099,511,627,776 bytes
PiB = pebibyte = 1024 TiB = 1,125,899,906,842,624 bytes
EiB = exbibyte = 1024 PiB = 1,152,921,504,606,846,976 bytes
