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GNU/Linux |
CentOS 5.6 |
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dstat(1) |
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dstat − versatile tool for generating system resource statistics
dstat [−afv] [options..] [delay [count]]
Dstat is a versatile replacement for vmstat, iostat and ifstat. Dstat overcomes some of the limitations and adds some extra features.
Dstat allows you to view all of your system resources instantly, you can eg. compare disk usage in combination with interrupts from your IDE controller, or compare the network bandwidth numbers directly with the disk throughput (in the same interval).
Dstat also cleverly gives you the most detailed information in columns and clearly indicates in what magnitude and unit the output is displayed. Less confusion, less mistakes, more efficient.
Dstat is unique in letting you aggregate block device throughput for a certain diskset or network bandwidth for a group of interfaces, ie. you can see the throughput for all the block devices that make up a single filesystem or storage system.
Dstat allows its data to be directly written to a CSV file to be imported and used by OpenOffice, Gnumeric or Excel to create graphs.
Note
Users of Sleuthkit might find Sleuthkit’s dstat being
renamed to datastat to avoid a name conflict. See Debian bug
#283709 for more information.
−c, −−cpu
enable cpu stats
−C 0,3,total
include cpu0, cpu3 and total
−d, −−disk
enable disk stats
−D total,hda
include hda and total
−g, −−page
enable page stats
−i, −−int
enable interrupt stats
−I 5,10
include interrupt 5 and 10
−l, −−load
enable load stats
−m, −−mem
enable memory stats
−n, −−net
enable network stats
−N eth1,total
include eth1 and total
−p, −−proc
enable process stats
−s, −−swap
enable swap stats
−S swap1,total
include swap1 and total
−t, −−time
enable time/date output
−T, −−epoch
enable time counter (seconds since epoch)
−y, −−sys
enable system stats
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−−ipc |
enable ipc stats |
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−−lock |
enable lock stats |
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−−raw |
enable raw stats |
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−−tcp |
enable tcp stats |
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−−udp |
enable udp stats |
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−−unix |
enable unix stats |
−M stat1,stat2
enable internal stats and external plugin stats
Possible internal stats are
cpu, cpu24, disk, disk24, disk24old, epoch, int, int24, ipc, load, lock, mem, net, page, page24, proc, raw, swap, swapold, sys, tcp, time, udp, unix
Possible external plugin stats can be listed using
dstat −M list
−a, −−all
equals −cdngy (default)
−f, −−full
expand −C, −D, −I, −N and −S discovery lists
−v, −−vmstat
equals −pmgdsc −D total
−−integer
show integer values
−−nocolor
disable colors (implies −−noupdate)
−−noheaders
disable repetitive headers
−−noupdate
disable intermediate updates when delay > 1
−−output file
write CSV output to file
delay is the delay in seconds between each update
count is the number of updates to display before exiting
The default delay is 1 and count is unspecified (unlimited)
When invoking dstat with a delay greater than 1 and without the −−noupdate option, it will show intermediate updates, ie. the first time a 1 sec average, the second update a 2 second average, etc. until the delay has been reached.
So in case you specified a delay of 10, the 9 intermediate updates are NOT snapshots, they are averages over the time that passed since the last final update. The end result is that you get a 10 second average on a new line, just like with vmstat.
Using dstat to
relate disk−throughput with network−usage
(eth0), total
CPU−usage and system counters:
dstat −dnyc −N eth0 −C total −f 5
Checking dstat’s behaviour and the system’s impact on dstat:
dstat −taf −−debug
Using the external app plugin
together with time and normal system
resources:
dstat −tcndylp −M app
This is identical to:
dstat −M time,cpu,net,disk,sys,load,proc,app
Since it’s practically impossible to test dstat on every possible permutation of kernel, python or distribution version, I need your help and your feedback to fix the remaining problems. If you have improvements or bugreports, please send them to: [1]dag@wieers.com
Note
Please see the TODO file for known bugs and future
plans.
Paths that may contain external dstat_* plugins:
~/.dstat/
(path of binary)/plugins/
/usr/share/dstat/
/usr/local/share/dstat/
Performance
tools
ifstat(1), iftop(8), iostat(1), mpstat(1), netstat(1),
nfsstat(1), nstat, vmstat(1), xosview(1)
Debugging
tools
htop, lslk(1), lsof(8), top(1)
Process
tracing
ltrace(1), pmap(1), ps(1), pstack(1), strace(1)
Binary
debugging
ldd(1), file(1), nm(1), objdump(1), readelf(1)
Memory usage
tools
free(1), memusage, memusagestat, slabtop(1)
Accounting
tools
dump−acct, dump−utmp, sa(8)
Hardware
debugging tools
dmidecode, ifinfo(1), lsdev(1), lshal(1), lshw(1), lsmod(8),
lspci(8), lsusb(8), smartctl(8), x86info(1)
Application
debugging
mailstats(8), qshape(1)
Xorg related
tools
xdpyinfo(1), xrestop(1)
Other useful
info
proc(5)
Written by Dag Wieers [1]dag@wieers.com
Homepage at [2]http://dag.wieers.com/home−made/dstat/
This manpage was initially written by Andrew Pollock [3]apollock@debian.org for the Debian GNU/Linux system, and updated by Dag Wieers [1]dag@wieers.com
1. dag@wieers.com
mailto:dag@wieers.com
2. http://dag.wieers.com/home−made/dstat/
http://dag.wieers.com/home−made/dstat/
3. apollock@debian.org
mailto:apollock@debian.org
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dstat(1) | |