Percona-Tookit工具包之pt-pmp
Preface
Sometimes we need to know the details of a program(porcess) when it is running even it's on the edge of crach.There's a lot of tools can be used to do these kind of job such as truss,strace,ltrace,pstack,gstack,gdb,etc.Truss and strace is focus on system call and signal generation whereas pstack,gstack,gdb are relevant with function call.Actually,pstack is a soft link of gstack,and gstack is a shell packaging script of gdb.
Introduce
pt-pmp is also relies on linux gdb.It's a tool which aggregate gdb statck traces for a specified program especially for MySQL.pt-pmp can create and summarize full stack traces of linux process by which we can diagnose what the process is waiting for.It is mostly used in performance tuning scenarios.
Procedure
Usage
pt-pmp [OPTIONS] [FILES]
Parameters(few parameters in this tool)
--binary //Specify which binary program to trace(default 'mysqld').
--pid //Specify a process id to trace.
--iterations //Specify trace times(default "1").
--interval //Number of seconds every time(default "0").
--lines //Specify the number of functions to trace(default "0" means infinite).
--save-samples //output aggregation into a file for later analysis.
Exapmle
Trace gdb stack of mysqld into a file(start mysqld and then execute pt-pmp).
[root@zlm1 :: ~]
#pt-pmp --save-samples pmp.log
Sun Jul :: CEST
/usr/bin/pt-pmp: line : gdb: command not found //gdb package is not installed. [root@zlm1 :: ~]
#yum install gdb //Install gdb package first.
//Omitted
Installed:
gdb.x86_64 :7.6.-.el7 Complete! [root@zlm1 :: ~]
#pt-pmp --save-samples pmp.log
Sun Jul :: CEST
__io_getevents_0_4(libaio.so.),LinuxAIOHandler::collect(os0file.cc:),LinuxAIOHandler::poll(os0file.cc:),os_aio_linux_handler(os0file.cc:),os_aio_handler(os0file.cc:),fil_aio_wait(fil0fil.cc:),io_handler_thread(srv0start.cc:),start_thread(libpthread.so.),clone(libc.so.)
pthread_cond_wait,wait(os0event.cc:),os_event::wait_low(os0event.cc:),srv_worker_thread(srv0srv.cc:),start_thread(libpthread.so.),clone(libc.so.)
sigwait(libpthread.so.),signal_hand(mysqld.cc:),pfs_spawn_thread(pfs.cc:),start_thread(libpthread.so.),clone(libc.so.)
sigwaitinfo(libc.so.),timer_notify_thread_func(posix_timers.c:),pfs_spawn_thread(pfs.cc:),start_thread(libpthread.so.),clone(libc.so.)
pthread_cond_wait,wait(os0event.cc:),os_event::wait_low(os0event.cc:),srv_purge_coordinator_suspend(srv0srv.cc:),srv_purge_coordinator_thread(srv0srv.cc:),start_thread(libpthread.so.),clone(libc.so.)
pthread_cond_wait,wait(os0event.cc:),os_event::wait_low(os0event.cc:),buf_resize_thread(buf0buf.cc:),start_thread(libpthread.so.),clone(libc.so.)
pthread_cond_wait,wait(os0event.cc:),os_event::wait_low(os0event.cc:),buf_dump_thread(buf0dump.cc:),start_thread(libpthread.so.),clone(libc.so.)
pthread_cond_wait,native_cond_wait(thr_cond.h:),my_cond_wait(thr_cond.h:),inline_mysql_cond_wait(thr_cond.h:),compress_gtid_table(thr_cond.h:),pfs_spawn_thread(pfs.cc:),start_thread(libpthread.so.),clone(libc.so.)
pthread_cond_timedwait,os_event::timed_wait(os0event.cc:),os_event::wait_time_low(os0event.cc:),srv_monitor_thread(srv0srv.cc:),start_thread(libpthread.so.),clone(libc.so.)
pthread_cond_timedwait,os_event::timed_wait(os0event.cc:),os_event::wait_time_low(os0event.cc:),srv_error_monitor_thread(srv0srv.cc:),start_thread(libpthread.so.),clone(libc.so.)
pthread_cond_timedwait,os_event::timed_wait(os0event.cc:),os_event::wait_time_low(os0event.cc:),pc_sleep_if_needed(buf0flu.cc:),buf_flush_page_cleaner_coordinator(buf0flu.cc:),start_thread(libpthread.so.),clone(libc.so.)
pthread_cond_timedwait,os_event::timed_wait(os0event.cc:),os_event::wait_time_low(os0event.cc:),lock_wait_timeout_thread(lock0wait.cc:),start_thread(libpthread.so.),clone(libc.so.)
pthread_cond_timedwait,os_event::timed_wait(os0event.cc:),os_event::wait_time_low(os0event.cc:),ib_wqueue_timedwait(ut0wqueue.cc:),fts_optimize_thread(fts0opt.cc:),start_thread(libpthread.so.),clone(libc.so.)
pthread_cond_timedwait,os_event::timed_wait(os0event.cc:),os_event::wait_time_low(os0event.cc:),dict_stats_thread(dict0stats_bg.cc:),start_thread(libpthread.so.),clone(libc.so.)
poll(libc.so.),vio_io_wait(viosocket.c:),vio_socket_io_wait(viosocket.c:),vio_read(viosocket.c:),net_read_raw_loop(net_serv.cc:),net_read_packet_header(net_serv.cc:),net_read_packet(net_serv.cc:),my_net_read(net_serv.cc:),Protocol_classic::read_packet(protocol_classic.cc:),Protocol_classic::get_command(protocol_classic.cc:),do_command(sql_parse.cc:),handle_connection(connection_handler_per_thread.cc:),pfs_spawn_thread(pfs.cc:),start_thread(libpthread.so.),clone(libc.so.)
poll(libc.so.),Mysqld_socket_listener::listen_for_connection_event(socket_connection.cc:),connection_event_loop(connection_acceptor.h:),mysqld_main(connection_acceptor.h:),__libc_start_main(libc.so.),_start
nanosleep(libpthread.so.),os_thread_sleep(os0thread.cc:),srv_master_sleep(srv0srv.cc:),srv_master_thread(srv0srv.cc:),start_thread(libpthread.so.),clone(libc.so.) //Above is the messages outupted on screen.All the contents is different functions relevant with linux and mysqld.
//The output sorts with rules of most-frequen first.
//The combination of function stacks lead by "__io_getevents_0_4(libaio.so.1)"(which is relevant with io) appears 10 times.
Check the content of output file.
#more pmp.log
TS 845703637.1530408066 -- ::
[New LWP ]
[New LWP ]
[New LWP ]
[New LWP ]
[New LWP ]
[New LWP ]
[New LWP ]
[New LWP ]
[New LWP ]
[New LWP ]
[New LWP ]
[New LWP ]
[New LWP ]
[New LWP ]
[New LWP ]
[New LWP ]
[New LWP ]
[New LWP ]
[New LWP ]
[New LWP ]
[New LWP ]
[New LWP ]
[New LWP ]
[New LWP ]
[New LWP ]
[New LWP ]
[New LWP ] //We got 28 new LWP from 3822 to 3981.
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib64/libthread_db.so.1".
0x00007f50efe74b7d in poll () from /lib64/libc.so. Thread (Thread 0x7f50e7ec1700 (LWP )): //It's the last thread in pmp.log file here.
# 0x00007f50efdbf7da in sigwaitinfo () from /lib64/libc.so.
# 0x0000000000f5171b in timer_notify_thread_func (arg=<optimized out>) at /export/home/pb2/build/sb_0--1514433850.9/mysql-5.7./mysys/posix_timers.c:
# 0x0000000000f707b4 in pfs_spawn_thread (arg=0x30cb000) at /export/home/pb2/build/sb_0--1514433850.9/mysql-5.7./storage/perfschema/pfs.cc:
# 0x00007f50f13c1df5 in start_thread () from /lib64/libpthread.so.
# 0x00007f50efe7f1ad in clone () from /lib64/libc.so. Thread (Thread 0x7f50ded07700 (LWP )):
# 0x00007f50f11b8644 in __io_getevents_0_4 () from /lib64/libaio.so.
# 0x000000000106a514 in LinuxAIOHandler::collect (this=0x7f50ded06e10) at /export/home/pb2/build/sb_0--1514433850.9/mysql-5.7./storage/innobase/os/os0file.cc:
# 0x000000000106bc34 in LinuxAIOHandler::poll (this=0x7f50ded06e10, m1=0x7f50ded06ec8, m2=0x7f50ded06ec0, request=0x7f50ded06e90) at /export/home/pb2/build/sb_0--1514433850.9/mysql-5.7./storage/innobase/os/os0file.cc:
# 0x000000000106d65c in os_aio_linux_handler (request=0x7f50ded06e90, m2=0x7f50ded06ec0, m1=0x7f50ded06ec8, global_segment=) at /export/home/pb2/build/sb_0--1514433850.9/mysql-5.7./storage/innobase/os/os0file.cc:
# os_aio_handler (segment=, m1=0x7f50ded06ec8, m2=0x7f50ded06ec0, request=0x7f50ded06e90) at /export/home/pb2/build/sb_0--1514433850.9/mysql-5.7./storage/innobase/os/os0file.cc:
# 0x000000000120196d in fil_aio_wait (segment=) at /export/home/pb2/build/sb_0--1514433850.9/mysql-5.7./storage/innobase/fil/fil0fil.cc:
# 0x000000000110e980 in io_handler_thread (arg=<optimized out>) at /export/home/pb2/build/sb_0--1514433850.9/mysql-5.7./storage/innobase/srv/srv0start.cc:
# 0x00007f50f13c1df5 in start_thread () from /lib64/libpthread.so.
# 0x00007f50efe7f1ad in clone () from /lib64/libc.so. Thread (Thread 0x7f50de506700 (LWP )):
# 0x00007f50f11b8644 in __io_getevents_0_4 () from /lib64/libaio.so.
# 0x000000000106a514 in LinuxAIOHandler::collect (this=0x7f50de505e10) at /export/home/pb2/build/sb_0--1514433850.9/mysql-5.7./storage/innobase/os/os0file.cc:
# 0x000000000106bc34 in LinuxAIOHandler::poll (this=0x7f50de505e10, m1=0x7f50de505ec8, m2=0x7f50de505ec0, request=0x7f50de505e90) at /export/home/pb2/build/sb_0--1514433850.9/mysql-5.7./storage/innobase/os/os0file.cc:
# 0x000000000106d65c in os_aio_linux_handler (request=0x7f50de505e90, m2=0x7f50de505ec0, m1=0x7f50de505ec8, global_segment=) at /export/home/pb2/build/sb_0--1514433850.9/mysql-5.7./storage/innobase/os/os0file.cc:
# os_aio_handler (segment=, m1=0x7f50de505ec8, m2=0x7f50de505ec0, request=0x7f50de505e90) at /export/home/pb2/build/sb_0--1514433850.9/mysql-5.7./storage/innobase/os/os0file.cc:
# 0x000000000120196d in fil_aio_wait (segment=) at /export/home/pb2/build/sb_0--1514433850.9/mysql-5.7./storage/innobase/fil/fil0fil.cc:
# 0x000000000110e980 in io_handler_thread (arg=<optimized out>) at /export/home/pb2/build/sb_0--1514433850.9/mysql-5.7./storage/innobase/srv/srv0start.cc:
# 0x00007f50f13c1df5 in start_thread () from /lib64/libpthread.so.
# 0x00007f50efe7f1ad in clone () from /lib64/libc.so. //Omitted. Thread (Thread 0x7f50deeb2700 (LWP )):
# 0x00007f50f13c8ec1 in sigwait () from /lib64/libpthread.so.
# 0x00000000007c357b in signal_hand (arg=<optimized out>) at /export/home/pb2/build/sb_0--1514433850.9/mysql-5.7./sql/mysqld.cc:
# 0x0000000000f707b4 in pfs_spawn_thread (arg=0x386a740) at /export/home/pb2/build/sb_0--1514433850.9/mysql-5.7./storage/perfschema/pfs.cc:
# 0x00007f50f13c1df5 in start_thread () from /lib64/libpthread.so.
# 0x00007f50efe7f1ad in clone () from /lib64/libc.so. Thread (Thread 0x7f50be7fc700 (LWP )):
# 0x00007f50f13c5705 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.
# 0x0000000000ebe6f5 in native_cond_wait (mutex=<optimized out>, cond=<optimized out>) at /export/home/pb2/build/sb_0--1514433850.9/mysql-5.7./include/thr_cond.h:
# my_cond_wait (mp=<optimized out>, cond=<optimized out>) at /export/home/pb2/build/sb_0--1514433850.9/mysql-5.7./include/thr_cond.h:
# inline_mysql_cond_wait (src_line=, src_file=0x15d92e0 "/export/home/pb2/build/sb_0-26514852-1514433850.9/mysql-5.7.21/sql/rpl_gtid_persist.cc", mutex=<optimized out>, that=<optimized out>) at /export/home/pb2/build/sb_0--1514433850.9/mysql-5.7./include/mysql/psi/mysql_thread.h:
# compress_gtid_table (p_thd=<optimized out>) at /export/home/pb2/build/sb_0--1514433850.9/mysql-5.7./sql/rpl_gtid_persist.cc:
# 0x0000000000f707b4 in pfs_spawn_thread (arg=0x386a740) at /export/home/pb2/build/sb_0--1514433850.9/mysql-5.7./storage/perfschema/pfs.cc:
# 0x00007f50f13c1df5 in start_thread () from /lib64/libpthread.so.
# 0x00007f50efe7f1ad in clone () from /lib64/libc.so. Thread (Thread 0x7f50dee81700 (LWP )):
# 0x00007f50efe74b7d in poll () from /lib64/libc.so.
# 0x00000000012bae8f in vio_io_wait (vio=<optimized out>, event=<optimized out>, timeout=) at /export/home/pb2/build/sb_0--1514433850.9/mysql-5.7./vio/viosocket.c:
# 0x00000000012baf83 in vio_socket_io_wait (vio=<optimized out>, event=<optimized out>) at /export/home/pb2/build/sb_0--1514433850.9/mysql-5.7./vio/viosocket.c:
# 0x00000000012bb5b8 in vio_read (vio=0x7f50b0000bb0, buf=0x7f50b000a3c0 "\001", size=) at /export/home/pb2/build/sb_0--1514433850.9/mysql-5.7./vio/viosocket.c:
# 0x0000000000c6de03 in net_read_raw_loop (net=0x7f50b0002570, count=) at /export/home/pb2/build/sb_0--1514433850.9/mysql-5.7./sql/net_serv.cc:
# 0x0000000000c6e69b in net_read_packet_header (net=0x7f50b0002570) at /export/home/pb2/build/sb_0--1514433850.9/mysql-5.7./sql/net_serv.cc:
# net_read_packet (net=0x7f50b0002570, complen=0x7f50dee80d38) at /export/home/pb2/build/sb_0--1514433850.9/mysql-5.7./sql/net_serv.cc:
# 0x0000000000c6e94c in my_net_read (net=0x7f50b0002570) at /export/home/pb2/build/sb_0--1514433850.9/mysql-5.7./sql/net_serv.cc:
# 0x0000000000c7c1dc in Protocol_classic::read_packet (this=0x7f50b0001e18) at /export/home/pb2/build/sb_0--1514433850.9/mysql-5.7./sql/protocol_classic.cc:
# 0x0000000000c7af52 in Protocol_classic::get_command (this=0x7f50b0001e18, com_data=0x7f50dee80de0, cmd=0x7f50dee80e0c) at /export/home/pb2/build/sb_0--1514433850.9/mysql-5.7./sql/protocol_classic.cc:
# 0x0000000000d1cf47 in do_command (thd=0x7f50b0000dc0) at /export/home/pb2/build/sb_0--1514433850.9/mysql-5.7./sql/sql_parse.cc:
# 0x0000000000ded7ac in handle_connection (arg=<optimized out>) at /export/home/pb2/build/sb_0--1514433850.9/mysql-5.7./sql/conn_handler/connection_handler_per_thread.cc:
# 0x0000000000f707b4 in pfs_spawn_thread (arg=0x382fa60) at /export/home/pb2/build/sb_0--1514433850.9/mysql-5.7./storage/perfschema/pfs.cc:
# 0x00007f50f13c1df5 in start_thread () from /lib64/libpthread.so.
# 0x00007f50efe7f1ad in clone () from /lib64/libc.so. Thread (Thread 0x7f50f17e8740 (LWP )):
# 0x00007f50efe74b7d in poll () from /lib64/libc.so.
# 0x0000000000deeaf9 in Mysqld_socket_listener::listen_for_connection_event (this=0x30d96f0) at /export/home/pb2/build/sb_0--1514433850.9/mysql-5.7./sql/conn_handler/socket_connection.cc:
# 0x00000000007c89c4 in connection_event_loop (this=0x373e050) at /export/home/pb2/build/sb_0--1514433850.9/mysql-5.7./sql/conn_handler/connection_acceptor.h:
# mysqld_main (argc=, argv=0x2f897b8) at /export/home/pb2/build/sb_0--1514433850.9/mysql-5.7./sql/mysqld.cc:
# 0x00007f50efdaaaf5 in __libc_start_main () from /lib64/libc.so.
# 0x00000000007be479 in _start ()
TS 788084395.1530408210 -- :: [root@zlm1 :: ~]
#
Demonstrate of relevant conceptions.
.What's gdb?
gdb is tool of linux,a debugger of GNU project.It can help you to see what's going on inside the program while it executes.For example,the usual case is the program running slowly or almost to be crashed. .What can gdb do?
It can catch details in the act belowl:
).Start the program and specify anything the might affect its behavior.
).Let the program stop on specific conditions.
).Check the details when the program stops.
).Change things in the program and try to correct effect of potential problems. .What's LWP?
LWP is abbreviation of Light Weight Process.
Process:You'll find a process in background after you've executed a linux command(which can be observed by "ps -ef").
Thread:It's nothing but a flow of execution of the linux process.
Light Weight Process:It's almost the same with "thread" but a term at kernal level. Here's some detail of it:
What are Linux Processes, Threads, Light Weight Processes, and Process State
https://www.thegeekstuff.com/2013/11/linux-process-and-threads/
Something about output file.
.The second column in the file shows the detail of memory address with hex.
.At the very beginning of the file in Thread (LWP ),it shows the detail of how MySQL process works.
"Mysqld_socket_listener::listen_for_connection_event" is a MySQL function defined in source code file "socket_connection.cc".This is a clue which can help you to findout where to servay the details if something happened and stucked here.
.At every bottom of each thread(except thread ),you can see the same contents below:
"#. 0x... clone () from /lib64/libc.so.6" //clone() is a function to create a new thread.
"#. 0x... start_thread () from /lib64/libpthread.so.0" //start_thread() is a function to start a poxis thread.
Summary
- pt-pmp is read-only tool and it depends on the linux gdb to collect stack traces.
- when pt-pmp works,it will attach gdb to the program you specified,what will probably freeze the program for a while.
- It's not recommend to run the tool on a very busy product system because of the potential freezing period and resource consumption.
- As a matter of fact,you can also do the stack tracing stuff by pstack tool but that's not today's motif.
Percona-Tookit工具包之pt-pmp的更多相关文章
- Linux后台开发工具箱
https://files-cdn.cnblogs.com/files/aquester/Linux后台开发工具箱.pdf 目录 目录 1 1. 前言 3 2. 脚本类工具 3 2.1. sed命令- ...
- Mysql: pt-table-checksum 和 pt-table-sync 检查主从一致性，实验过程
一.安装 percona 包 1.安装仓库的包 https://www.percona.com/doc/percona-repo-config/yum-repo.html sudo yum insta ...
- Linux后台开发工具箱-葵花宝典
Linux后台开发工具箱-葵花宝典 一见 2016/11/4 目录 目录 1 1. 前言 4 2. 脚本类工具 4 2.1. 双引号和单引号 4 2.2. 取脚本完整文件路径 5 2.3. 环境变量和 ...
- 推荐几款MySQL相关工具
前言: 随着互联网技术的不断发展, MySQL 相关生态也越来越完善,越来越多的工具涌现出来.一些公司或个人纷纷开源出一些不错的工具,本篇文章主要介绍几款 MySQL 相关实用工具.提醒下,这里并不介 ...
- [知识库分享系列] 二、.NET（ASP.NET）
最近时间又有了新的想法,当我用新的眼光在整理一些很老的知识库时,发现很多东西都已经过时,或者是很基础很零碎的知识点.如果分享出去大家不看倒好,更担心的是会误人子弟,但为了保证此系列的完整,还是选择分享 ...
- SQL慢查询安装过程
SQL慢查询 基本操作 打开防火墙 firewall-cmd --zone=public --add-port=3306/tcp --permanent firewall-cmd --reload 安 ...
- 快速安装Percona pt工具
yum install perl-DBI perl-DBD-MySQL perl-Time-HiRes perl-Time-HiRes perl-IO-Socket-SSLwget http://pk ...
- Percona 工具包 pt-online-schema-change 简介
mysql的在线表结构修改,因为低效和阻塞读写.一直被诟病.至于ALTER TABLE 的原理,参看我上一篇文章.MySQL在线修改大表结构.看完后,发现的问题是还是会锁的,且对于在线更新的这块也是不 ...
- 安装percona工具包
1.安装percona源 sudo yum install http://www.percona.com/downloads/percona-release/redhat/0.1-4/percona- ...
- percona pt toolkit 总结
##=====================================================##pt-osc之工作流程:1.检查更改表是否有主键或唯一索引,是否有触发器2.检查修改表 ...
随机推荐
- spring DelegatingFilterProxy管理过滤器
安全过滤器链 Spring Security的web架构是完全基于标准的servlet过滤器的.它没有在内部使用servlet或任何其他基于servlet的框架(比如spring mvc),所以它没有 ...
- pat1046. Shortest Distance (20)
1046. Shortest Distance (20) 时间限制 100 ms 内存限制 65536 kB 代码长度限制 16000 B 判题程序 Standard 作者 CHEN, Yue The ...
- Spring boot-(3) Spring Boot特性1
本节将深入Spring Boot的细节,可以学到你想使用的或定制的Spring Boot的主要特性. 1. SpringApplication SpringApplication类为引导一个Sprin ...
- POJ 3164——Command Network——————【最小树形图、固定根】
Command Network Time Limit: 1000MS Memory Limit: 131072K Total Submissions: 15080 Accepted: 4331 ...
- pyhon虚拟环境的安装和使用
安装Python2.7: 1.Mac下使用Python2.7 2.Windows下安装Python2.7. *从python官网下载python2.7的版本 *双击python2.7,然后选择安装路径 ...
- php删除服务器所有session踢掉所有在线用户linux
注意:如果要删除服务器上所有session,重启php服务是解决不了问题的,php的session是持久化的. 有效解决办法: 删除 /tmp 下的所有文件(默认php的session文件是在/tmp ...
- 配置Slf4j依赖，桥接各种多个日志组件（排除commons-logging依赖的影响)
由于各个jar组件使用的日志框架不一样,实际项目中可能会引入多个jar,通常使用的日志框架有 commons-logging log4j 若同一个项目引入多个日志组件,那么Slf4j组件会有不能捕捉到 ...
- MySQL(四)
一.使用正则表达式查询 SELECT * FROM employee WHERE name REGEXP '^ale'; SELECT * FROM employee WHERE name REGEX ...
- AngularJS表单验证开发案例
angular支持IE8+浏览器,虽然性能很好,但是目前只适用于手机端项目 知识点:域$scopeAngularJS基础指令指令实现不同的功能学习思路和方法 <link rel="st ...
- Unity Shader 阴影
最近在看Unity shader开发实战详解,刚开始看阴影部分,稍微有了点思路.在这里写点笔记,算是小结吧. .阴影实现方法 一种是通过模拟光照的原理,用向量的方法 找到被光线照射的点 映射到平面的位 ...