Visit The New, Modern Unix Linux Community

Linux and UNIX Man Pages

Test Your Knowledge in Computers #66
Difficulty: Medium
IT and cybersecurity risk management is based on the intersection of these three areas, criticality, vulnerability, and threat.
True or False?
Linux & Unix Commands - Search Man Pages

dstat(1) [centos man page]

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, hardware interrupt, software interrupt) -C 0,3,total include cpu0, cpu3 and total (when using -c/--cpu) -d, --disk enable disk stats (read, write) -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) -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) --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) --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) --plugin-name enable (external) plugins by plugin name, see PLUGINS for options Possible internal stats are aio, cpu, cpu24, disk, disk24, disk24old, epoch, fs, int, int24, io, ipc, load, lock, mem, net, page, page24, proc, raw, socket, swap, swapold, sys, tcp, time, udp, unix, vm --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 (implies --noupdate) --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-tps per disk transactions per second (tps) stats --disk-util per disk utilization in percentage --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 --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-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 --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) --rpc show RPC client calls stats --rpcd show RPC server calls stats --sendmail show sendmail queue size (needs sendmail) --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) --vmk-hba show VMware ESX kernel vmhba stats --vmk-int show VMware ESX kernel interrupt stats --vmk-nic show VMware ESX kernel port stats --vm-memctl show ballooning status inside VMware guests --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 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 cpu stats with interrupts per device: dstat -tcyif 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: [1]dag@wieers.com 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/ SEE ALSO
Performance tools ifstat(1), iftop(8), iostat(1), mpstat(1), netstat(1), nfsstat(1), nstat, vmstat(1), xosview(1) Debugging tools htop(1), 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 collectl(1), proc(5), procinfo(8) AUTHOR
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. REFERENCES
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 0.7.0 06/15/2010 DSTAT(1)

Featured Tech Videos