编程开发
pstack命令可显示每个进程的栈跟踪。pstack命令必须由相应进程的属主或 root 运行。可以使用pstack来确定进程挂起的位置。此命令允许使用的唯一选项是要检查的进程的 PID。
命令软件包下载地址：https://packages.debian.org/sid/pstack
实例pstree以树结构显示进程
pstree -p work | ad(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。
-Lf 4551UID PID PPID LWP C NLWP STIME TTY CMDwork 4551 22670 4551 2 7 16:30 pts/2 Sl+ 0:02 ./ad_preprocesswork 4551 22670 4552 0 7 16:30 pts/2 Sl+ 0:00 ./ad_preprocesswork 4551 22670 4553 0 7 16:30 pts/2 Sl+ 0:00 ./ad_preprocesswork 4551 22670 4554 0 7 16:30 pts/2 Sl+ 0:00 ./ad_preprocesswork 4551 22670 4555 0 7 16:30 pts/2 Sl+ 0:00 ./ad_preprocesswork 4551 22670 4556 0 7 16:30 pts/2 Sl+ 0:00 ./ad_preprocesswork 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 4551Thread 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_沉默的小猫咪 ()#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_沉默的小猫咪 ()#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_沉默的小猫咪 () from /lib64/tls/libc.so.6#1 0x000000302af8f010 in () 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_沉默的小猫咪 () 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_沉默的小猫咪 () 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 ()
转载于:https://blog.51cto.com/gongxiaoyi/1684120