How to Monitor system statistics using dstat
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dstat Tool - To Monitor Processor, Memory, Network Performance on Linux
Dstats is an versatile resource statistic tool. This tool combines the ability of iostat, vmstat, netstat, and ifstat. Dstat allow us to monitor the server resources in real-time. Monitoring system statistics using dstat is explained.
Features
- Combines all the stats
- Modular approach
- Shows stats in the exact time frame
- Enable or order counters during analysis/troubleshooting
To install dstat in CentOS, use yum install command
[root@linuxhelp ~]# yum install dstat -y
Loaded plugins: fastestmirror, langpacks
Determining fastest mirrors
* base: centos.webwerks.com
* extras: centos.webwerks.com
* updates: centos.webwerks.com
Resolving Dependencies
--> Running transaction check
---> Package dstat.noarch 0:0.7.2-12.el7 will be installed
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Running transaction
Installing : dstat-0.7.2-12.el7.noarch 1/1
Verifying : dstat-0.7.2-12.el7.noarch 1/1
Installed:
dstat.noarch 0:0.7.2-12.el7
Complete!
Now we have successfully installed dstat.
To display the cpu, disk stats, network stats, page stats, system stats etc., run the following command.
[root@linuxhelp ~]# dstat
You did not select any stats, using -cdngy by default.
----total-cpu-usage---- -dsk/total- -net/total- ---paging-- ---system--
usr sys idl wai hiq siq| read writ| recv send| in out | int csw
8 6 80 5 0 1| 564k 238k| 0 0 | 455B 2926B| 394 548
22 2 75 0 0 1| 0 0 | 0 0 | 0 0 | 290 372
26 3 71 0 0 0| 0 0 | 0 0 | 0 0 | 322 445
25 2 73 0 0 0| 0 0 | 120B 0 | 0 0 | 314 392
16 2 82 0 0 0| 0 0 | 60B 0 | 0 0 | 230 292
30 3 66 0 0 1| 0 0 | 120B 0 | 0 0 | 658 699
32 4 64 0 0 0| 0 0 | 0 0 | 0 0 | 739 713
25 2 73 0 0 0| 0 0 | 0 0 | 0 0 | 658 701
30 2 68 0 0 0| 0 0 | 0 0 | 0 0 | 586 617
34 2 64 0 0 0| 0 0 | 0 0 | 0 0 | 723 666
19 1 80 0 0 0| 0 0 | 0 0 | 0 0 | 401 535
26 3 71 0 0 0| 0 0 | 60B 0 | 0 0 | 414 493
21 1 78 0 0 0| 0 0 | 60B 0 | 0 0 | 426 472
27 2 71 0 0 0| 0 0 | 240B 0 | 0 0 | 394 445
15 2 83 0 0 0| 0 0 | 120B 0 | 0 0 | 216 286
The following options can be used along with dstat.
c : cpu stats (total cpu usage)
d : disk stats (disk/total)
n : network stats (net/total)
g : page stats (paging)
y : system stats (system)
To view the information about cpu, memory, eth0 activity and system resources related to time.
[root@linuxhelp ~]# dstat -tcmsn -N eth0
Module dstat_net failed to load. (No suitable network interfaces found to monitor)
----system---- ----total-cpu-usage---- ------memory-usage----- ----swap---
time |usr sys idl wai hiq siq| used buff cach free| used free
08-07 04:18:14| 9 6 80 5 0 1| 560M 0 317M 110M|7572k 1993M
08-07 04:18:15| 19 1 80 0 0 0| 560M 0 317M 110M|7572k 1993M
08-07 04:18:16| 25 3 72 0 0 0| 560M 0 317M 110M|7572k 1993M
08-07 04:18:17| 34 2 64 0 0 0| 560M 0 317M 110M|7572k 1993M
08-07 04:18:18| 16 2 82 0 0 0| 560M 0 317M 110M|7572k 1993M
08-07 04:18:19| 26 2 72 0 0 0| 560M 0 317M 110M|7572k 1993M
08-07 04:18:20| 26 2 72 0 0 0| 560M 0 317M 110M|7572k 1993M
08-07 04:18:21| 16 1 83 0 0 0| 560M 0 317M 110M|7572k 1993M
08-07 04:18:22| 26 3 71 0 0 0| 560M 0 317M 110M|7572k 1993M
08-07 04:18:23| 25 1 73 0 0 1| 560M 0 317M 110M|7572k 1993M
08-07 04:18:24| 18 2 80 0 0 0| 560M 0 317M 110M|7572k 1993M
08-07 04:18:25| 23 2 75 0 0 0| 560M 0 317M 110M|7572k 1993M
08-07 04:18:26| 17 1 82 0 0 0| 560M 0 317M 110M|7572k 1993M
To view the information about cpu, disk (sda1) utilization and system load, run the following command.
[root@linuxhelp ~]# dstat -cdl -D sda1
----total-cpu-usage---- --dsk/sda1- ---load-avg---
usr sys idl wai hiq siq| read writ| 1m 5m 15m
9 5 80 5 0 1| 11k 741B|0.54 0.41 0.61
18 2 80 0 0 0| 0 0 |0.54 0.41 0.61
24 3 73 0 0 0| 0 0 |0.50 0.40 0.61
24 2 74 0 0 0| 0 0 |0.50 0.40 0.61
15 2 83 0 0 0| 0 0 |0.50 0.40 0.61
24 2 73 0 0 1| 0 0 |0.50 0.40 0.61
25 2 73 0 0 0| 0 0 |0.50 0.40 0.61
16 2 82 0 0 0| 0 0 |0.54 0.41 0.61
23 3 74 0 0 0| 0 0 |0.54 0.41 0.61
24 1 75 0 0 0| 0 0 |0.54 0.41 0.61
15 2 83 0 0 0| 0 0 |0.54 0.41 0.61
23 2 75 0 0 0| 0 0 |0.54 0.41 0.61
41 3 56 0 0 0| 0 0 |0.49 0.41 0.61
To display the information about top cpu, top latency and top memory
[root@linuxhelp ~]# dstat --top-cpu-adv --top-latency --top-mem
Module dstat_top_latency failed to load. (Kernel has no scheduler statistics, use at least 2.6.12)
-------most-expensive-cpu-process------- --most-expensive-
process pid cpu read write| memory process
gnome-shell 5435 4.2%3689B1847k|gnome-shell 239M
gnome-shell 5435 14% 16B7681k|gnome-shell 239M
gnome-shell 5435 16% 16B7681k|gnome-shell 239M
gnome-shell 5435 22% 24B 11M|gnome-shell 239M
gnome-shell 5435 15% 16B7681k|gnome-shell 239M
gnome-shell 5435 14% 16B7681k|gnome-shell 239M
gnome-shell 5435 23% 24B 11M|gnome-shell 239M
gnome-shell 5435 14% 16B7681k|gnome-shell 239M
gnome-shell 5435 14% 16B7681k|gnome-shell 239M
gnome-shell 5435 25% 24B 11M|gnome-shell 239M
gnome-shell 5435 14% 16B7681k|gnome-shell 239M
gnome-shell 5435 17% 16B7681k|gnome-shell 239M
To extend the delay, mention the delay time at the end of dstat command. Here, we are displaying the output for a delay of every 10 seconds.
[root@linuxhelp ~]# dstat -tn -N eth0 --tcp 10
Module dstat_net failed to load. (No suitable network interfaces found to monitor)
----system---- ----tcp-sockets----
time |lis act syn tim clo
08-07 04:21:43| 13 0 0 0 0
08-07 04:21:53| 13 0 0 0 0
08-07 04:22:03| 13 0 0 0 0
To show the count delay for limiting the number of stats updates to 20 with delay for every 4 second.
[root@linuxhelp ~]# dstat -tn 4 20
----system---- -net/total-
time | recv send
08-07 04:23:45| 0 0
08-07 04:23:49| 60B 0
08-07 04:23:53| 97B 0
08-07 04:23:57| 60B 0
08-07 04:24:01| 45B 0
08-07 04:24:05| 23B 23B
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