Linux under the Multi-threaded viewing tool (Pstree, PS, Pstack), the-pstree instructions for using the Linux command

1. Pstree

Pstree displaying processes in a tree structure

[Email protected]*:~# pstreeinit─┬─networkmanager  ├─abrt-dump-oops  ├─abrtd  ├─atd  ├─auditd───{ AUDITD}  ├─automount───4*[{automount}]  ├─certmonger  ├─crond  ├─dbus-daemon  ├─HALD─┬─HALD-RUNNER─┬─HALD-ADDON-ACPI  ││   └─hald-addon-inpu  │└─{hald}  ├─httpd─┬─httpd  │  └─4*[httpd───26*[{httpd}]]  ├─irqbalance  ├─mcelog  ├─6*[mingetty]  ├─modem-manager  ├─mysqld_safe───mysqld───38*[{mysqld}]  ├─nginx───13*[nginx]  ├─php-fpm───76*[php-fpm]  ├─portreserve  ├─rpc.idmapd  ├─rpc.statd  ├─rpcbind  ├─rsyslogd───3*[{rsyslogd}]  ├─2*[ SendMail]  ├─sshd───sshd───bash───pstree  ├─udevd───2*[udevd]  ├─wpa_supplicant  └─xinetd

2. Ps-lf

$ PS-LF 1892

As follows: The PHP process started a total of 0 threads

[Email protected]**:~# ps-lf 1892

UID PID PPID LWP C nlwp stime TTY STAT time CMD

Root 1892 1 1892 0 1 Jan15? Ss 0:53 Php-fpm:master Process (/usr/local/php/etc/php-fpm.conf)

MySQL Multiple threads:

[Email protected]*:~# ps-lf 3005

UID PID PPID LWP C nlwp stime TTY STAT time CMD

MySQL 3005 3005 0 Jan15? Sl 2:25/usr/local/mysql/bin/mysqld--basedir=/usr/local/mysql--datadir=/data/mysql--plugin-dir=

MySQL 3005 3081 0 Jan15? Sl 0:00/usr/local/mysql/bin/mysqld--basedir=/usr/local/mysql--datadir=/data/mysql--plugin-dir=

MySQL 3005 3082 0 Jan15? Sl 0:05/usr/local/mysql/bin/mysqld--basedir=/usr/local/mysql--datadir=/data/mysql--plugin-dir=

MySQL 3005 3083 0 Jan15? Sl 0:00/usr/local/mysql/bin/mysqld--basedir=/usr/local/mysql--datadir=/data/mysql--plugin-dir=

MySQL 3005 3084 0 Jan15? Sl 0:00/usr/local/mysql/bin/mysqld--basedir=/usr/local/mysql--datadir=/data/mysql--plugin-dir=

MySQL 3005 3085 0 Jan15? Sl 0:00/usr/local/mysql/bin/mysqld--basedir=/usr/local/mysql--datadir=/data/mysql--plugin-dir=

MySQL 3005 3086 0 Jan15? Sl 0:00/usr/local/mysql/bin/mysqld--basedir=/usr/local/mysql--datadir=/data/mysql--plugin-dir=

MySQL 3005 3087 0 Jan15? Sl 0:05/usr/local/mysql/bin/mysqld--basedir=/usr/local/mysql--datadir=/data/mysql--plugin-dir=

3. Pstack

Pstack shows the stack trace for each process, PHP's FPM master process, found that this thing is walking epoll:

[Email protected]:~# pstack 1892

#0 0x00000030e9ae8fb3 in __epoll_wait_nocancel () from/lib64/libc.so.6

#1 0x0000000000856a74 in Fpm_event_epoll_wait ()

#2 0x000000000084afff in Fpm_event_loop ()

#3 0x0000000000845ee7 in Fpm_run ()

#4 0x000000000084d900 in Main ()

You have new mail in/var/spool/mail/root

• This article is from: Linux Learning Tutorial Network

Linux under the Multi-threaded viewing tool (Pstree, PS, Pstack), the-pstree instructions for using the Linux command