pstack命令用來顯示進程的棧跟蹤。 pstack 命令必須由相應進程的屬主或root賬號運行。可以使用pstack來確定進程掛起的位置。此命令只有一個參數，那就是pid，具體關於pstack的介紹可以查看man手冊，如下所示：
[root@DB-Server ~]# man pstack
PSTACK(1) Linux Programmer’s Manual PSTACK(1)
NAME
pstack - print a stack trace of a running process
SYNOPSIS
pstack pid
DESCRIPTION
pstack attaches to the active process named by the pid on the command line, and prints out an execution stack trace. If ELF symbols exist in the binary (usually the case
unless you have run strip(1)), then symbolic addresses are printed as well.
If the process is part of a thread group, then pstack will print out a stack trace for each of the threads in the group.
SEE ALSO
nm(1), ptrace(2), gdb(1)
AUTHORS
Ross Thompson <ross@whatsis.com>
Red Hat, Inc. <http://bugzilla.redhat.com/bugzilla>
Red Hat Linux Dec 17 2004 PSTACK(1)
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例如我們可以使用pstack命令來查看Oracle監聽進程的棧跟蹤，如下所示
1： 首先找到監聽進程的進程號
[oracle@DB-Server~]$ ps -ef | grep lsn
oracle 12027 11806 0 11:18 pts/1 00:00:00 grep lsn
oracle 31440 1 0 Mar04 ? 00:01:41 /u01/app/oracle/product/10.2.0/db_1/bin/tnslsnr LISTENER -inherit
2： 將監聽進程的棧跟蹤信息寫入文件lsn_pstack.log
[oracle@DB-Server~]$ pstack 31440 >> lsn_pstack.log
[oracle@DB-Server~]$ pstack 31440 >> lsn_pstack.log
[oracle@DB-Server~]$ pstack 31440 >> lsn_pstack.log
[oracle@DB-Server~]$
3：如下所示，我們可以看到函數調用關系為：main->nsglma->nsevwait->ntevque->ntevpque->poll.
[oracle@DB-Server~]$ more lsn_pstack.log
#0 0x0000003c7d0cb65f in poll () from /lib64/libc.so.6
#1 0x00007f82c63292e7 in ntevpque () from /u01/app/oracle/product/10.2.0/db_1/lib/libclntsh.so.10.1
#2 0x00007f82c6326aab in ntevque () from /u01/app/oracle/product/10.2.0/db_1/lib/libclntsh.so.10.1
#3 0x00007f82c62fc81e in nsevwait () from /u01/app/oracle/product/10.2.0/db_1/lib/libclntsh.so.10.1
#4 0x00000000004108d9 in nsglma ()
#5 0x0000000000405abd in main ()
#0 0x0000003c7d0cb65f in poll () from /lib64/libc.so.6
#1 0x00007f82c63292e7 in ntevpque () from /u01/app/oracle/product/10.2.0/db_1/lib/libclntsh.so.10.1
#2 0x00007f82c6326aab in ntevque () from /u01/app/oracle/product/10.2.0/db_1/lib/libclntsh.so.10.1
#3 0x00007f82c62fc81e in nsevwait () from /u01/app/oracle/product/10.2.0/db_1/lib/libclntsh.so.10.1
#4 0x00000000004108d9 in nsglma ()
#5 0x0000000000405abd in main ()
#0 0x0000003c7d0cb65f in poll () from /lib64/libc.so.6
#1 0x00007f82c63292e7 in ntevpque () from /u01/app/oracle/product/10.2.0/db_1/lib/libclntsh.so.10.1
#2 0x00007f82c6326aab in ntevque () from /u01/app/oracle/product/10.2.0/db_1/lib/libclntsh.so.10.1
#3 0x00007f82c62fc81e in nsevwait () from /u01/app/oracle/product/10.2.0/db_1/lib/libclntsh.so.10.1
#4 0x00000000004108d9 in nsglma ()
#5 0x0000000000405abd in main ()
[oracle@DB-Server~]$