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这篇文章主要为大家展示了“linux系统中pstack命令怎么用”，内容简而易懂，条理清晰，希望能够帮助大家解决疑惑，下面让小编带领大家一起研究并学习一下“linux系统中pstack命令怎么用”这篇文章吧。
pstack用来跟踪进程栈，这个命令在排查进程问题时非常有用，比如我们发现一个服务一直处于work状态（如假死状态，好似死循环），使用这个命令就能轻松定位问题所在。
实例
pstree以树结构显示进程
pstree -p work | grep ad
sshd22669)---bash22670)---ad_preprocess4551)-+-{ad_preprocess}4552)
|-{ad_preprocess}4553)
|-{ad_preprocess}4554)
|-{ad_preprocess}4555)
|-{ad_preprocess}4556)
`-{ad_preprocess}4557)
work为工作用户，-p为显示进程识别码，ad_preprocess共启动了6个子线程，加上主线程共7个线程。
ps -Lf 4551 UID PID PPID LWP C NLWP STIME TTY stat time CMD work 4551 22670 4551 2 7 16:30 pts/2 Sl+ 0:02 ./ad_preprocess work 4551 22670 4552 0 7 16:30 pts/2 Sl+ 0:00 ./ad_preprocess work 4551 22670 4553 0 7 16:30 pts/2 Sl+ 0:00 ./ad_preprocess work 4551 22670 4554 0 7 16:30 pts/2 Sl+ 0:00 ./ad_preprocess work 4551 22670 4555 0 7 16:30 pts/2 Sl+ 0:00 ./ad_preprocess work 4551 22670 4556 0 7 16:30 pts/2 Sl+ 0:00 ./ad_preprocess work 4551 22670 4557 0 7 16:30 pts/2 Sl+ 0:00 ./ad_preprocess
进程共启动了7个线程
pstack显示每个进程的栈跟踪：
pstack 4551 Thread 7 Thread 1084229984 LWP 4552)):#0 0x000000302afc63dc in epoll_wait ) from /lib64/tls/libc.so.6#1 0x00000000006f0730 in ub::EPollEx::poll )#2 0x00000000006f172a in ub::NetReactor::callback )#3 0x00000000006fbbbb in ub::UBTask::CALLBACK )#4 0x000000302b80610a in start_thread ) from /lib64/tls/libpthread.so.0#5 0x000000302afc6003 in clone ) from /lib64/tls/libc.so.6#6 0x0000000000000000 in ?? )Thread 6 Thread 1094719840 LWP 4553)):#0 0x000000302afc63dc in epoll_wait ) from /lib64/tls/libc.so.6#1 0x00000000006f0730 in ub::EPollEx::poll )#2 0x00000000006f172a in ub::NetReactor::callback )#3 0x00000000006fbbbb in ub::UBTask::CALLBACK )#4 0x000000302b80610a in start_thread ) from /lib64/tls/libpthread.so.0#5 0x000000302afc6003 in clone ) from /lib64/tls/libc.so.6#6 0x0000000000000000 in ?? )Thread 5 Thread 1105209696 LWP 4554)):#0 0x000000302b80baa5 in __nanosleep_nocancel )#1 0x000000000079e758 in comcm::ms_sleep )#2 0x00000000006c8581 in ub::UbClientManager::healthyCheck )#3 0x00000000006c8471 in ub::UbClientManager::start_healthy_check )#4 0x000000302b80610a in start_thread ) from /lib64/tls/libpthread.so.0#5 0x000000302afc6003 in clone ) from /lib64/tls/libc.so.6#6 0x0000000000000000 in ?? )Thread 4 Thread 1115699552 LWP 4555)):#0 0x000000302b80baa5 in __nanosleep_nocancel )#1 0x0000000000482b0e in armor::armor_check_thread )#2 0x000000302b80610a in start_thread ) from /lib64/tls/libpthread.so.0#3 0x000000302afc6003 in clone ) from /lib64/tls/libc.so.6#4 0x0000000000000000 in ?? )Thread 3 Thread 1126189408 LWP 4556)):#0 0x000000302af8f1a5 in __nanosleep_nocancel ) from /lib64/tls/libc.so.6#1 0x000000302af8f010 in sleep ) from /lib64/tls/libc.so.6#2 0x000000000044c972 in Business_config_manager::run )#3 0x0000000000457b83 in Thread::run_thread )#4 0x000000302b80610a in start_thread ) from /lib64/tls/libpthread.so.0#5 0x000000302afc6003 in clone ) from /lib64/tls/libc.so.6#6 0x0000000000000000 in ?? )Thread 2 Thread 1136679264 LWP 4557)):#0 0x000000302af8f1a5 in __nanosleep_nocancel ) from /lib64/tls/libc.so.6#1 0x000000302af8f010 in sleep ) from /lib64/tls/libc.so.6#2 0x00000000004524bb in Process_thread::sleep_period )#3 0x0000000000452641 in Process_thread::run )#4 0x0000000000457b83 in Thread::run_thread )#5 0x000000302b80610a in start_thread ) from /lib64/tls/libpthread.so.0#6 0x000000302afc6003 in clone ) from /lib64/tls/libc.so.6#7 0x0000000000000000 in ?? )Thread 1 Thread 182894129792 LWP 4551)):#0 0x000000302af8f1a5 in __nanosleep_nocancel ) from /lib64/tls/libc.so.6#1 0x000000302af8f010 in sleep ) from /lib64/tls/libc.so.6#2 0x0000000000420d79 in Ad_preprocess::run )#3 0x0000000000450ad0 in main )
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