Percona-Tookit工具包之pt-ioprofile

 

Preface

 

    As a matter of fact,disk IO is the most important factor which tremendously influence performance of database especially in OLTP which is usually called IO-intensive system.The high concurrency is always in company with high IOPS as well.Furthermore,it's also a bottleneck in many scenarios.Thus,we have to monitor the IO cost of MySQL db by different tools such as zabbix,lepus.They usually provide a entire db performance monitoring not merely IO status.

 

Introduce

 

*    pt-ioprofile is a tool of Percona-Toolkit which can be used to monitor the IO activities by MySQL itself.It provide direct and quantitive informations and indicate the real IO costs by different processes or relevent files.pt-ioprofile is the tool which combines lsof and strace to analyze informations.
*

 

Procedure

 

Usage

1 pt-ioprofile [OPTIONS] [FILE]

 

**Main parameter(they're almost entire)**

1 --aggregate -- Whether use aggregate function or not(default "sum",others "avg").
2 --cell -- Specify the type of cell contents(default "times",others "size","count").
3 --group-by -- Specify the type of group by contents(default "filename",others "all","pid").
4 --profile-process -- Specify the process which is to be profiled(default muysqld).
5 --profile-pid -- Specify the pid instead of prcocess name.
6 --run-time -- Specify how long time it will take(default 30s).
7 --save-samples -- Specify a file which sample data can be put in.

 

Examples

 

Execute pt-ioprofile to have a test.

 1 [root@zlm2 08:47:12 ~]
 2 #ps aux|grep mysqld
 3 mysql     8971  0.0 19.0 1108096 193900 pts/1  Sl   08:29   0:00 mysqld --defaults-file=/data/mysql/mysql3306/my.cnf
 4 root      9319  0.0  0.0 112640   960 pts/2    R+   08:47   0:00 grep --color=auto mysqld
 5 
 6 [root@zlm2 08:47:14 ~]
 7 #pt-ioprofile --cell size --run-time 10
 8 Tue Jun 26 08:47:29 CEST 2018
 9 Tracing process ID 8971
10      total filename -- There's nothing output here,I'm afraid I've encountered a bug.
11 
12 ###Here's a website about the bug.###
13 https://bugs.launchpad.net/percona-toolkit/+bug/925778
14 
15 [root@zlm2 08:47:40 ~]
16 #pt-ioprofile --version
17 pt-ioprofile 3.0.10 -- My version of Percorna-Toolkit is 3.0.10.
18 
19 [root@zlm2 08:47:46 ~]
20 #yum list|grep percona-toolkit
21 percona-toolkit.x86_64                      3.0.10-1.el7               installed

 

**Erase the latest Porcona-Toolkit 3.10.0 and change the old version 2.2.20.金沙官网线上,**

 1 root@zlm2 08:49:16 ~]
 2 #yum erase percona-toolkit
 3 
 4 [root@zlm2 09:02:55 ~]
 5 #wget https://www.percona.com/downloads/percona-toolkit/2.2.20/RPM/percona-toolkit-2.2.20-1.noarch.rpm
 6 
 7 [root@zlm2 09:04:47 ~]
 8 #yum localinstall percona-toolkit-2.2.20-1.noarch.rpm
 9 
10 [root@zlm2 09:05:05 ~]
11 #pt-ioprofile --version
12 pt-ioprofile 2.2.20
13 
14 [root@zlm2 09:06:46 ~]
15 #time pt-ioprofile --cell size --run-time 10
16 Tue Jun 26 09:07:36 CEST 2018
17 Tracing process ID 8971
18      total filename -- It still doesn't work properly without a file specified.
19 
20 real    0m11.127s
21 user    0m0.048s
22 sys     0m0.081s

 

**There're percona release notes below which describes the bug is fixed in v2.0.3.**

1 https://www.percona.com/doc/percona-toolkit/3.0/release_notes.html
2 ...
3 Fixed bug 925778: pt-ioprofile doesn’t run without a file
4 ...

 

**    I'm really confused with why it cannot be executed properly even though in the newest version.No more stuff I can find to solve the problem now.Maybe I'll test it another day.**

 

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