linux 进程cpu占用过大问题排查

1、 先pstack查看进程号的各个线程，保存到a.log下：

[[email protected] workspace]$ pstack 10034 > a.log

文件里面格式：
Thread 9 (Thread 0x7f01679f8700 (LWP 10646)):
#0  0x00000036c440b7bb in [email protected]@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00007f01dc4f0542 in FBASE2::CEvent::Wait(long) () from /home/cres/workspace/lib/libf_os.so
#2  0x00007f01d3f270b3 in CUtodbThread::Run() () from libfsc_utodb.so
#3  0x00007f01dc4efe7a in FBASE2::thread_function_ex(void*) () from /home/cres/workspace/lib/libf_os.so
#4  0x00000036c4407851 in start_thread () from /lib64/libpthread.so.0
#5  0x00000036c3ce767d in clone () from /lib64/libc.so.6
Thread 8 (Thread 0x7f0166ff7700 (LWP 10647)):
#0  0x00000036c440b7bb in [email protected]@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00007f01dc4f0542 in FBASE2::CEvent::Wait(long) () from /home/cres/workspace/lib/libf_os.so
#2  0x00007f01d3f270b3 in CUtodbThread::Run() () from libfsc_utodb.so
#3  0x00007f01dc4efe7a in FBASE2::thread_function_ex(void*) () from /home/cres/workspace/lib/libf_os.so
#4  0x00000036c4407851 in start_thread () from /lib64/libpthread.so.0
#5  0x00000036c3ce767d in clone () from /lib64/libc.so.6

2、 用top查看进程下的各个线程cpu占用情况：

[[email protected] workspace]$ top -H -p 10034

3、将对应的cpu占用大的线程，和a.log文件中的线程LWP对应起来。就能知道是哪个处理线程占用大了。