linux查看线程cpu占用情况
在搞服务器的时候有时候会遇到一些线程CPU占用100%的情况，这里记录一些查看方法以备不时之需。具体操作请看：
1、 ps -aef | grep TestTcpSV
rickey 2932 1864 0 17:00 pts/0 00:00:00 ./TestTcpSV
rickey 2999 2939 0 17:06 pts/1 00:00:00 grep TestTcpSV
2、top -H -p 2932
top - 17:07:31 up 24 days, 7:11, 2 users, load average: 0.22, 0.28, 0.29
Tasks: 5 total, 0 running, 5 sleeping, 0 stopped, 0 zombie
Cpu(s): 10.5%us, 6.2%sy, 0.0%ni, 72.4%id, 10.2%wa, 0.0%hi, 0.7%si, 0.0%st
Mem: 1808812k total, 1194496k used, 614316k free, 208688k buffers
Swap: 3637240k total, 50248k used, 3586992k free, 732100k cached
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
2932 rickey 20 0 59864 1412 1180 S 0.0 0.1 0:00.00 TestTcpSV
2935 rickey 20 0 59864 1412 1180 S 0.0 0.1 0:00.00 TestTcpSV
2936 rickey 20 0 59864 1412 1180 S 0.0 0.1 0:00.00 TestTcpSV
2937 rickey 20 0 59864 1412 1180 S 0.0 0.1 0:00.00 TestTcpSV
2938 rickey 20 0 59864 1412 1180 S 0.0 0.1 0:00.00 TestTcpSV
3、pstack 2932 （LWP 与 ID对应）
Thread 5 (Thread 0xb6affb70 (LWP 2935)):
#0 0x008c8424 in __kernel_vsyscall ()
#1 0x00b319d6 in epoll_wait () from /lib/libc.so.6
#2 0x08085450 in epoll_dispatch ()
#3 0x08075209 in event_base_loop ()
#4 0x08076079 in event_base_dispatch ()
#5 0x0805ae64 in CTcpSVTask::Run() ()
#6 0x0805c976 in CThreadPoolTask::Run() ()
#7 0x0805b9ad in Run(void*) ()
#8 0x00c1fa09 in start_thread () from /lib/libpthread.so.0
#9 0x00b3115e in clone () from /lib/libc.so.6
Thread 4 (Thread 0xb5effb70 (LWP 2936)):
#0 0x008c8424 in __kernel_vsyscall ()
#1 0x00b319d6 in epoll_wait () from /lib/libc.so.6
#2 0x08085450 in epoll_dispatch ()
#3 0x08075209 in event_base_loop ()
#4 0x08076079 in event_base_dispatch ()
#5 0x0805ae64 in CTcpSVTask::Run() ()
#6 0x0805c976 in CThreadPoolTask::Run() ()
#7 0x0805b9ad in Run(void*) ()
#8 0x00c1fa09 in start_thread () from /lib/libpthread.so.0
#9 0x00b3115e in clone () from /lib/libc.so.6
Thread 3 (Thread 0xb52ffb70 (LWP 2937)):
#0 0x008c8424 in __kernel_vsyscall ()
#1 0x00b319d6 in epoll_wait () from /lib/libc.so.6
#2 0x08085450 in epoll_dispatch ()
#3 0x08075209 in event_base_loop ()
#4 0x08076079 in event_base_dispatch ()
#5 0x0805ae64 in CTcpSVTask::Run() ()
#6 0x0805c976 in CThreadPoolTask::Run() ()
#7 0x0805b9ad in Run(void*) ()
#8 0x00c1fa09 in start_thread () from /lib/libpthread.so.0
#9 0x00b3115e in clone () from /lib/libc.so.6
Thread 2 (Thread 0xb48feb70 (LWP 2938)):
#0 0x008c8424 in __kernel_vsyscall ()
#1 0x00b319d6 in epoll_wait () from /lib/libc.so.6
#2 0x08085450 in epoll_dispatch ()
#3 0x08075209 in event_base_loop ()
#4 0x08076079 in event_base_dispatch ()
#5 0x0805ae64 in CTcpSVTask::Run() ()
#6 0x0805c976 in CThreadPoolTask::Run() ()
#7 0x0805b9ad in Run(void*) ()
#8 0x00c1fa09 in start_thread () from /lib/libpthread.so.0
#9 0x00b3115e in clone () from /lib/libc.so.6
Thread 1 (Thread 0xb77af6d0 (LWP 2932)):
#0 0x008c8424 in __kernel_vsyscall ()
#1 0x00b319d6 in epoll_wait () from /lib/libc.so.6
#2 0x08085450 in epoll_dispatch ()
#3 0x08075209 in event_base_loop ()
#4 0x08076079 in event_base_dispatch ()
#5 0x08059909 in CTcpSV::Loop() ()
#6 0x0805a9ba in CTcpSV::Start() ()
#7 0x0804ac3d in main ()