pcp-dstat man page

pcp-dstat — versatile tool for generating system resource statistics

Synopsis

pcp [pcp options] dstat [dstat options] [delay [count]]

Description

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.

Additionally, this version introduces configuration files similar to pmrep.conf(5) from the pmrep(1) utility. 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. This new style of plugin is either built-in (time-related reporting only), or sourced from the system-wide location ($PCP_ETC_DIR/dstat) and/or sourced from an individual users set of personal plugins ($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.

The available dstat options 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)

-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-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 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

--noupdate

disable intermediate updates when delay greater than 1.

-o file, --output file

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

--innodb-buffer

show innodb buffer stats (needs the MySQL PMDA)

--innodb-io

show innodb I/O stats (needs the MySQL PMDA)

--innodb-ops

show innodb operations counters (needs the MySQL PMDA)

--lustre

show lustre I/O throughput (needs the Lustre PMDA)

--memcache-hits

show the number of hits and misses from memcache

--mysql5-cmds

show the MySQL5 command stats (needs the MySQL PMDA)

--mysql5-conn

show the MySQL5 connection stats (needs the MySQL PMDA)

--mysql5-innodb

show the MySQL5 innodb stats (needs the MySQL PMDA)

--mysql5-io

show the MySQL5 I/O stats (needs the MySQL PMDA)

--mysql5-keys

show the MySQL5 keys stats (needs the MySQL PMDA)

--mysql-io

show the MySQL I/O stats (needs the MySQL PMDA)

--mysql-keys

show the MySQL keys stats (needs the MySQL PMDA)

--postfix

show postfix queue sizes (needs the Postfix PMDA)

--redis

show Redis stats (needs the Redis PMDA)

--sendmail

show sendmail queue size (needs the Sendmail PMDA)

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 <pcp@groups.io> if you need or implement any of these, and we'll work with you to get them included.

--battery

battery in percentage (needs an ACPI PMDA)

--battery-remain

battery remaining in hours, minutes (needs an ACPI PMDA)

--cpufreq

CPU frequency in percentage (needs an ACPI PMDA)

--dbus

number of dbus connections (needs a python-dbus PMDA)

--fan

fan speed (needs an ACPI PMDA)

--gpfs

GPFS read/write I/O (needs mmpmon and a GPFS PMDA)

--gpfs-ops

GPFS filesystem operations (needs mmpmon and a GPFS PMDA)

--md-status

show software raid (MD driver) progress and speed (needs new disk.md metrics)

--power

show power usage (needs an ACPI PMDA)

--qmail

show qmail queue sizes (needs qmail)

--squid

show squid usage statistics (needs a Squid PMDA)

--thermal

system temperature sensors (needs an ACPI PMDA)

--vm-cpu

show VMware CPU stats from hypervisor (needs a VMware PMDA)

--vm-mem

show VMware memory stats from hypervisor (needs a VMware PMDA)

--vm-mem-adv

show advanced VMware memory stats from hypervisor (needs a VMware PMDA)

--vmk-hba

show VMware ESX kernel vmhba stats (needs a VMware PMDA)

--vmk-int

show VMware ESX kernel interrupt stats (needs a VMware PMDA)

--vmk-nic

show VMware ESX kernel port stats (needs a VMware PMDA)

--vz-cpu

show CPU usage per OpenVZ guest (needs an OpenVZ PMDA)

--vz-io

show I/O usage per OpenVZ guest (needs an OpenVZ PMDA)

--vz-ubc

show OpenVZ user beancounters (needs an OpenVZ PMDA)

--wifi

wireless link quality and signal to noise ratio (needs Linux PMDA metrics)

--zfs-arc

show ZFS arc stats (needs a Linux ZFS PMDA)

--zfs-l2arc

show ZFS l2arc stats (needs a Linux ZFS PMDA)

--zfs-zil

show ZFS zil stats (needs a Linux ZFS PMDA)

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/pcp/dstat/

system-wide configuration files

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).

Environment Variables

Internal plugins behaviour can be changed through environment variables.

DSTAT_TIMEFMT

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

Authors

The Dstat utility was initially written by Dag Wieers <dag@wieers.com>.

The Dstat homepage is at http://dag.wieers.com/home-made/dstat/.

This manpage was initially written by Andrew Pollock <apollock@debian.org> for the Debian GNU/Linux system.

The pcp-dstat utility is written and maintained by the PCP developers <pcp@groups.io>.

The PCP homepage is at https://pcp.io/.

See Also

PCPIntro(1), pcp(1), pmcd(1), pminfo(1), pmlogger(1), pmprobe(1), pmrep(1), vmstat(1), pmGetOptions(3), strftime(3), PMNS(5), pcp.conf(5), pmrep.conf(5) and utmp(5).

Referenced By

pcp-dstat(5).

PCP Performance Co-Pilot