term% cat index.txt STATS(8) System Manager's Manual STATS(8)
NAME
stats - display graphs of system activity
SYNOPSIS
stats [ -option ] [ machine ... ]
DESCRIPTION
Stats displays a rolling graph of various statistics collected by the
operating system and updated once per second. The statistics may be
from a remote machine or multiple machines, whose graphs will appear in
adjacent columns. The columns are labeled by the machine names and the
number of processors on the machine if it is a multiprocessor.
The right mouse button presents a menu to enable and disable the dis‐
play of various statistics; by default, stats begins by showing the
load average on the executing machine.
The lower-case options choose the initial set to display:
b battery
percentage battery life remaining.
c context
number of process context switches per second.
e ether
total number of packets sent and received per second.
E etherin,out
number of packets sent and received per second, displayed as
separate graphs.
f fault
number of page faults per second.
i intr number of interrupts per second.
I idle system load, % time in idle, and % time in interrupts. The last
two are averaged over all processors on a multiprocessor.
l load (default) system load average. The load is computed as a run‐
ning average of the number of processes ready to run, multiplied
by 1000.
m mem total pages of active memory. The graph displays the fraction
of the machine's total memory in use.
k kern kernel memory allocation size in bytes.
d draw draw memory allocation size in bytes.
n etherin,out,err
number of packets sent and received per second, and total number
of errors, displayed as separate graphs.
p tlbpurge
number of translation lookaside buffer flushes per second.
s syscall
number of system calls per second.
t tlbmiss
number of translation lookaside buffer misses per second.
w swap number of valid pages on the swap device. The swap is displayed
as a fraction of the number of swap pages configured by the ma‐
chine.
8 802.11b
display the signal strength detected by the 802.11b wireless
ether card; the value is usually below 50% unless the receiver
is in the same room as the transmitter, so a midrange value rep‐
resents a strong signal.
The graphs are plotted with time on the horizontal axis. The vertical
axes range from 0 to 1000*sleepsecs, multiplied by the number of pro‐
cessors on the machine when appropriate. The only exceptions are mem‐
ory, and swap space, which display fractions of the total available,
system load, which displays a number between 0 and 1000, idle and intr,
which display percentages and the Ethernet error count, which goes from
0 to 10.. If the value of the parameter is too large for the visible
range, its value is shown in decimal in the upper left corner of the
graph.
Upper-case options control details of the display. All graphs are af‐
fected; there is no mechanism to affect only one graph.
-T sleepsecs
Set the number of seconds between samples to sleepsecs (default
one second). Sleepsecs may be a floating-point number.
-S scale
Sets a scale factor for the displays. A value of 2, for exam‐
ple, means that the highest value plotted will be twice as large
as the default.
-L Plot all graphs with logarithmic y axes. The graph is plotted
so the maximum value that would be displayed on a linear graph
is 2/3 of the way up the y axis and the total range of the graph
is a factor of 1000; thus the y origin is 1/100 of the default
maximum value and the top of the graph is 10 times the default
maximum.
-Y If the display is large enough to show them, place value markers
along the y axes of the graphs. Since one set of markers serves
for all machines across the display, the values in the markers
disregard scaling factors due to multiple processors on the ma‐
chines. On a graph for a multiprocessor, the displayed values
will be larger than the markers indicate. The markers appear
along the right, and the markers show values appropriate to the
rightmost machine; this only matters for graphs such as memory
that have machine-specific maxima.
FILES
/net/ether0/0/stats
#c/swap
#c/sysstat
SOURCE
/sys/src/cmd/stats.c
BUGS
Some machines do not have TLB hardware.
STATS(8)