pstack命令可顯示每個程序的棧跟蹤，pstack $pid即可，pstack命令須由$pid程序的屬主或者root執行。
這次出現cpu佔比100%的情況，但看memory佔比，並無異常，懷疑是某個地方死迴圈了。經同事提醒，用pstack命令檢視相關程序，通過執行多次pstack，發現**棧總是停在同乙個位置。具體看**，發現就是這個地方寫錯了。
這真的是個很強大的命令！和strace命令一樣強大
下面是有七個執行緒的程序的**棧列印情況
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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