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dstat - versatile tool for generating system resource statistics

DSTAT(1)   DSTAT(1)

NAME

dstat - versatile tool for generating system resource statistics

SYNOPSIS

dstat [-afv] [options..] [delay [count]]

DESCRIPTION

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.
 

OPTIONS

-c, --cpu
enable cpu stats (system, user, idle, wait), for more CPU related stats also see --cpu-adv and --cpu-use
-C 0,3,total
include cpu0, cpu3 and total (when using -c/--cpu); use all to show all CPUs
-d, --disk
enable disk stats (read, write), for more disk related stats look into the other --disk plugins
-D total,hda
include total and hda (when using -d/--disk)
-g, --page
enable page stats (page in, page out)
-i, --int
enable interrupt stats
-I 5,10
include interrupt 5 and 10 (when using -i/--int)
-l, --load
enable load average stats (1 min, 5 mins, 15mins)
-m, --mem
enable memory stats (used, buffers, cache, free); for more memory related stats also try --mem-adv and --swap
-n, --net
enable network stats (receive, send)
-N eth1,total
include eth1 and total (when using -n/--net)
-p, --proc
enable process stats (runnable, uninterruptible, new)
-r, --io
enable I/O request stats (read, write requests)
-s, --swap
enable swap stats (used, free)
-S swap1,total
include swap1 and total (when using -s/--swap)
-t, --time
enable time/date output
-T, --epoch
enable time counter (seconds since epoch)
-y, --sys
enable system stats (interrupts, context switches)
--aio
enable aio stats (asynchronous I/O)
--cpu-adv
enable advanced cpu stats
--cpu-use
enable only cpu usage stats
--fs, --filesystem
enable filesystem stats (open files, inodes)
--ipc
enable ipc stats (message queue, semaphores, shared memory)
--lock
enable file lock stats (posix, flock, read, write)
--mem-adv
enable advanced memory stats
--raw
enable raw stats (raw sockets)
--socket
enable socket stats (total, tcp, udp, raw, ip-fragments)
--tcp
enable tcp stats (listen, established, syn, time_wait, close)
--udp
enable udp stats (listen, active)
--unix
enable unix stats (datagram, stream, listen, active)
--vm
enable vm stats (hard pagefaults, soft pagefaults, allocated, free)
--vm-adv
enable advance vm stats (steal, scanK, scanD, pgoru, astll)
--zones
enable zoneinfo stats (d32F, d32H, normF, normH)
--plugin-name
enable (external) plugins by plugin name, see PLUGINS for options
Possible internal stats are
aio, cpu, cpu24, cpu-adv, cpu-use, disk, disk24, disk24-old, epoch, fs, int, int24, io, ipc, load, lock, mem, mem-adv, net, page, page24, proc, raw, socket, swap, swap-old, sys, tcp, time, udp, unix, vm, vm-adv, zones
--list
list the internal and external plugin names
-a, --all
equals -cdngy (default)
-f, --full
expand -C, -D, -I, -N and -S discovery lists
-v, --vmstat
equals -pmgdsc -D total
--bits
force bits for values expressed in bytes
--float
force float values on screen (mutual exclusive with --integer)
--integer
force integer values on screen (mutual exclusive with --float)
--bw, --blackonwhite
change colors for white background terminal
--nocolor
disable colors
--noheaders
disable repetitive headers
--noupdate
disable intermediate updates when delay > 1
--output file
write CSV output to file
--profile
show profiling statistics when exiting dstat

PLUGINS

While anyone can create their own dstat plugins (and contribute them) dstat ships with a number of plugins already that extend its capabilities greatly. Here is an overview of the plugins dstat ships with:
--battery
battery in percentage (needs ACPI)
--battery-remain
battery remaining in hours, minutes (needs ACPI)
--cpufreq
CPU frequency in percentage (needs ACPI)
--dbus
number of dbus connections (needs python-dbus)
--disk-avgqu
average queue length of the requests that were issued to the device
--disk-avgrq
average size (in sectors) of the requests that were issued to the device
--disk-svctm
average service time (in milliseconds) for I/O requests that were issued to the device
--disk-tps
number of transfers per second that were issued to the device
--disk-util
percentage of CPU time during which I/O requests were issued to the device (bandwidth utilization for the device)
--disk-wait
average time (in milliseconds) for I/O requests issued to the device to be served
--dstat
show dstat cputime consumption and latency
--dstat-cpu
show dstat advanced cpu usage
--dstat-ctxt
show dstat context switches
--dstat-mem
show dstat advanced memory usage
--fan
fan speed (needs ACPI)
--freespace
per filesystem disk usage
--gpfs
GPFS read/write I/O (needs mmpmon)
--gpfs-ops
GPFS filesystem operations (needs mmpmon)
--helloworld
Hello world example dstat plugin
--innodb-buffer
show innodb buffer stats
--innodb-io
show innodb I/O stats
--innodb-ops
show innodb operations counters
--lustre
show lustre I/O throughput
--md-status
show software raid (md) progress and speed
--memcache-hits
show the number of hits and misses from memcache
--mysql5-cmds
show the MySQL5 command stats
--mysql5-conn
show the MySQL5 connection stats
--mysql5-innodb
show the MySQL5 innodb stats
--mysql5-io
show the MySQL5 I/O stats
--mysql5-keys
show the MySQL5 keys stats
--mysql-io
show the MySQL I/O stats
--mysql-keys
show the MySQL keys stats
--net-packets
show the number of packets received and transmitted
--nfs3
show NFS v3 client operations
--nfs3-ops
show extended NFS v3 client operations
--nfsd3
show NFS v3 server operations
--nfsd3-ops
show extended NFS v3 server operations
--nfsd4-ops
show extended NFS v4 server operations
--nfsstat4
show NFS v4 stats
--ntp
show NTP time from an NTP server
--postfix
show postfix queue sizes (needs postfix)
--power
show power usage
--proc-count
show total number of processes
--qmail
show qmail queue sizes (needs qmail)
 
--redis: show redis stats
--rpc
show RPC client calls stats
--rpcd
show RPC server calls stats
--sendmail
show sendmail queue size (needs sendmail)
--snmp-cpu
show CPU stats using SNMP from DSTAT_SNMPSERVER
--snmp-load
show load stats using SNMP from DSTAT_SNMPSERVER
--snmp-mem
show memory stats using SNMP from DSTAT_SNMPSERVER
--snmp-net
show network stats using SNMP from DSTAT_SNMPSERVER
 
--snmp-net-err: show network errors using SNMP from DSTAT_SNMPSERVER
--snmp-sys
show system stats (interrupts and context switches) using SNMP from DSTAT_SNMPSERVER
--snooze
show number of ticks per second
--squid
show squid usage statistics
--test
show test plugin output
--thermal
system temperature sensors
--top-bio
show most expensive block I/O process
--top-bio-adv
show most expensive block I/O process (incl. pid and other stats)
--top-childwait
show process waiting for child the most
--top-cpu
show most expensive CPU process
--top-cpu-adv
show most expensive CPU process (incl. pid and other stats)
--top-cputime
show process using the most CPU time (in ms)
--top-cputime-avg
show process with the highest average timeslice (in ms)
--top-int
show most frequent interrupt
--top-io
show most expensive I/O process
--top-io-adv
show most expensive I/O process (incl. pid and other stats)
--top-latency
show process with highest total latency (in ms)
--top-latency-avg
show process with the highest average latency (in ms)
--top-mem
show process using the most memory
--top-oom
show process that will be killed by OOM the first
--utmp
show number of utmp connections (needs python-utmp)
--vm-cpu
show VMware CPU stats from hypervisor
--vm-mem
show VMware memory stats from hypervisor
--vm-mem-adv
show advanced VMware memory stats from hypervisor
--vmk-hba
show VMware ESX kernel vmhba stats
--vmk-int
show VMware ESX kernel interrupt stats
--vmk-nic
show VMware ESX kernel port stats
--vz-cpu
show CPU usage per OpenVZ guest
--vz-io
show I/O usage per OpenVZ guest
--vz-ubc
show OpenVZ user beancounters
--wifi
wireless link quality and signal to noise ratio
--zfs-arc
show ZFS arc stats
--zfs-l2arc
show ZFS l2arc stats
--zfs-zil
show ZFS zil stats

ARGUMENTS

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)

INTERMEDIATE UPDATES

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.

EXAMPLES

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 impact of dstat:
 
dstat -taf --debug
 
Using the time plugin together with cpu, net, disk, system, load, proc and top_cpu plugins:
 
dstat -tcndylp --top-cpu
 
this is identical to
 
dstat --time --cpu --net --disk --sys --load --proc --top-cpu
 
Using dstat to relate advanced cpu stats with interrupts per device:
 
dstat -t --cpu-adv -yif

BUGS

Since it is 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: dag@wieers.com[1]
 
 
Note
 
 
 
Please see the TODO file for known bugs and future plans.
 

FILES

Paths that may contain external dstat_*.py plugins:
 
~/.dstat/
(path of binary)/plugins/
/usr/share/dstat/
/usr/local/share/dstat/

ENVIRONMENT VARIABLES

Dstat will read additional command line arguments from the environment variable DSTAT_OPTS. You can use this to configure Dstat’s default behavior, e.g. if you have a black-on-white terminal:
 
export DSTAT_OPTS="--bw --noupdate"
 
Other internal or external plugins have their own environment variables to influence their behavior, e.g.
 
DSTAT_NTPSERVER
 
DSTAT_MYSQL
DSTAT_MYSQL_HOST
DSTAT_MYSQL_PORT
DSTAT_MYSQL_SOCKET
DSTAT_MYSQL_USER
DSTAT_MYSQL_PWD
 
DSTAT_SNMPSERVER
DSTAT_SNMPCOMMUNITY
 
DSTAT_SQUID_OPTS
 
DSTAT_TIMEFMT

SEE ALSO

Performance tools

htop(1), ifstat(1), iftop(8), iostat(1), mpstat(1), netstat(8), nfsstat(8), perf(1), powertop(1), rtacct(8), top(1), vmstat(8), xosview(1)

Process tracing

lslk(8), lsof(8), ltrace(1), pidstat(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, ps_mem(1), slabtop(1), smem(8)

Accounting tools

acct(2), dump-acct(8), dump-utmp(8), lastcomm(1), sa(8)

Hardware debugging tools

dmidecode(8), ifinfo(1), lsdev(1), lshal(1), lshw(1), lsmod(8), lspci(8), lsusb(8), numactl(8), smartctl(8), turbostat(8), x86info(1)

Application debugging

mailstats(8), qshape(1)
xdpyinfo(1), xrestop(1)

Other useful info

collectl(1), proc(5), procinfo(8)

AUTHOR

Written by Dag Wieers dag@wieers.com[1]
 
Homepage at http://dag.wieers.com/home-made/dstat/
 
This manpage was initially written by Andrew Pollock apollock@debian.org[2] for the Debian GNU/Linux system.

AUTHOR

Dag Wieers <dag@wieers.com>
Author.

NOTES

1.
dag@wieers.com
mailto:dag@wieers.com
2.
apollock@debian.org
mailto:apollock@debian.org
August 2014   0.7.3