dstat1

Usage

Overview

pcp-dstat is a general performance analysis tool allowing you to view multiple system resources instantly, for example you can compare disk usage in combination with interrupts from a disk controller, or compare the network bandwidth numbers directly with the disk throughput (in the same interval).

It also cleverly gives you the most detailed information in columns and clearly indicates in what magnitude and unit the output is being displayed. Less confusion, fewer mistakes, more efficient.

The delay is the delay in seconds between each update, and the count is the number of updates to display before exiting. The default delay is 1 second and count is unspecified (run until interrupted or end of archive is reached).

This latest generation of Dstat, pcp-dstat, allows for analysis of historical performance data (in the PCP archive format created by pmlogger(1)), as well as distributed systems analysis of live performance data from remote hosts running the pmcd(1) process.

The original Dstat notion of ``plugins'' is replaced by use of named metrics in a Performance Metric Name Space (PMNS(5)) supplied by Performance Metric Domain Agents (PMDAs). Metrics and other formatting information is now specified as plugin configuration files in pcp-dstat(5) format. This new style of plugin is either built-in (time-related reporting only), or sourced from the system-wide location ($PCP_SYSCONF_DIR/dstat) and/or sourced from an individual users set of personal plugins ($HOME/.pcp/dstat).

The list of all available plugins can be seen using the --list dstat command line option.

Options

When invoked via the pcp(1) command, the -h/ --host, -a/ --archive, -O/ --origin, -Z/ --timezone and several other pcp options become indirectly available; refer to PCPIntro(1) for a complete description of these options.

The additional command line options available for pcp-dstat are:

--list

list all available plugin names

--plugin-name

enable any plugin by name

-a, --all

equals -cdngy (default plugin set)

-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 or --disk-tps plugin)

--dm, --device-mapper

enable device mapper stats (read, write); for more device-mapper related stats look into the other --dm plugins

--L total,root,home

include total, root and home (when using --dm/--device-mapper or --dm-tps plugin)

--md, --multi-device

enable multi-device driver stats (read, write); for more multi-device driver related stats look into the other --md plugins

--M total,md-0

include total and md-0 (when using --md/--multi-device or --md-tps plugin)

--part, --partition

enable disk partition stats (read, write); for more partition related stats look into the other --part plugins

--P total,sda2

include total and sda2 (when using --part/--partition or --part-tps plugin)

-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, 15 mins)

-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)

--net-packets

show the number of packets received and transmitted

-p, --proc

enable process stats (runnable, uninterruptible, new)

--proc-count

show total number of processes

-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)

--snooze show time spent between updates in seconds

-t, --time

enable time/date output (try --time-adv for millisecond precision)

-T, --epoch

enable time counter (seconds since epoch, or millisecond precision from the --epoch-adv plugin)

-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

--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

--fs, --filesystem

enable filesystem stats (open files, inodes)

--freespace

per filesystem used and available space

--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)

--utmp

shows login information from utmp(5)

--vm

enable virtual memory stats (hard pagefaults, soft pagefaults, allocated, free)

--vm-adv

enable advance virtual memory stats (steal, scanK, scanD, pgoru, astll)

--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

--rpc

show remote procedure call (RPC) client calls stats

--rpcd

show remote procedure call (RPC) server calls stats

--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 milliseconds)

--top-cputime-avg

show process with the highest average timeslice (in milliseconds)

--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 milliseconds)

--top-latency-avg

show process with the highest average latency (in milliseconds)

--top-mem

show process using the most memory

--top-oom

show process that will be killed by the out-of-memory (OOM) killer the first

-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 (mutually exclusive with --integer)

--integer

force integer values on screen (mutually exclusive with --float)

--bw, --blackonwhite

change colors for white background terminal

--nocolor

disable colors

--noheaders

disable repetitive headers

--nomissed

disable missed ticks warnings for intermediate samples.

--noupdate

disable intermediate updates when delay greater than 1.

-o file, --output=file

write CSV (Comma-Separated Value) format output to a file.

-p file, --pidfile=file

write the process identifier to a given file.

Optional metrics plugins

Some pcp-dstat configuration files require the installation of optional Performance Metric Domain Agents, above and beyond the default installed set.

Historical metrics plugins

Anyone can create additional, custom pcp-dstat plugin configuration files, for any metrics - the list of available metrics can be produced by either the pminfo(1) or pmprobe(1) command.

The following do not yet have metrics backing them, but have been included from the original Dstat utility. Please contact <[email protected]> if you need or implement any of these, and we'll work with you to get them included.

Intermediate updates

When invoking pcp-dstat with a delay greater than 1 second and without the --noupdate option, it will show intermediate updates, i.e., the first time a 1 second 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(1).

Examples

Using pcp-dstat to relate disk-throughput with network-usage (eth0), total CPU-usage and system counters:

$ pcp dstat -dnyc -N eth0 -C total -f 5

Using the time plugin together with cpu, net, disk, system, load and proc plugins:

$ pcp dstat -tcndylp

This is identical to:

$ pcp dstat --time --cpu --net --disk --sys --load --proc

Using pcp-dstat to report 10 samples from metrics recorded in a PCP archive 20180729 from 2:30 AM:

$ pcp --origin '@02:30' -a 20180729 dstat --time --cpu-adv --sys 1 10

Examine the same metrics live from a remote host:

$ pcp --host www.acme.com dstat --time --cpu-adv --sys 1 10

Files

$HOME/.pcp/dstat/

private per-user configuration files

$PCP_SYSCONF_DIR/dstat/

system-wide configuration files

Environment

Internal plugins behaviour can be changed through environment variables.

DSTAT_TIMEFMT

strftime(3) format string for reporting time (see --time)

PCP environment

Environment variables with the prefix PCP_ are used to parameterize the file and directory names used by PCP. On each installation, the file /etc/pcp.conf contains the local values for these variables. The $PCP_CONF variable may be used to specify an alternative configuration file, as described in pcp.conf(5).

For environment variables affecting PCP tools, see pmGetOptions(3).