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，下面为大家详细讲解一下pstack具体使用方法。
实例
pstree以树结构显示进程
pstree -p work | grep ad
sshd(22669)---bash(22670)---ad_preprocess(4551)-+-{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 ()文章来源网络，作者：运维，如若转载，请注明出处：https://shuyeidc.com/wp/221754.html<
