本篇文章给大家谈谈linux如何找出死循环,以及最简单的死循环对应的知识点,希望对各位有所帮助,不要忘了收藏本站喔。
本文目录一览:
1、如何定位死循环或高CPU利用率linux
找出调用栈 使用gdb attach nmsagent所在的进程,在gdb中使用 info threads显示所有线程 gdb gdbattach 2907 gdbinfo threads 得到如下结果,可以发现2909线程的编号是12 13 Thread 0xad5f2b70 (LWP 2908) 0x004ef0d7 in mq_timedreceive () from /lib/tls/i686/cmov/librt.so.1 12 Thread 0xad58eb70 (LWP 2909) 0x006e0422 in __kernel_vsyscall () 11 Thread 0xad52ab70 (LWP 2910) 0x006e0422 in __kernel_vsyscall () 10 Thread 0xad4f8b70 (LWP 2911) 0x006e0422 in __kernel_vsyscall () 9 Thread 0xad4c6b70 (LWP 2912) 0x006e0422 in __kernel_vsyscall () 8 Thread 0xad3feb70 (LWP 2913) 0x004ef0d7 in mq_timedreceive () from /lib/tls/i686/cmov/librt.so.1 7 Thread 0xace08b70 (LWP 2914) 0x004ef0d7 in mq_timedreceive () from /lib/tls/i686/cmov/librt.so.1 6 Thread 0xac607b70 (LWP 2915) 0x006e0422 in __kernel_vsyscall () 5 Thread 0xac5e6b70 (LWP 2916) 0x006e0422 in __kernel_vsyscall () 4 Thread 0xac361b70 (LWP 2917) 0x006e0422 in __kernel_vsyscall () 3 Thread 0xac2fdb70 (LWP 2918) 0x006e0422 in __kernel_vsyscall () 2 Thread 0xac1fcb70 (LWP 2919) 0x004ef0d7 in mq_timedreceive () from /lib/tls/i686/cmov/librt.so.1 * 1 Thread 0xb78496d0 (LWP 2907) 0x006e0422 in __kernel_vsyscall () 使用thread 切换线程,使用bt显示线程栈 gdbthread 12 gdbbt 得到如下线程栈 #0 0x006e0422 in __kernel_vsyscall () #1 0x001cca26 in nanosleep () from /lib/tls/i686/cmov/libc.so.6 #2 0x001fc2dc in usleep () from /lib/tls/i686/cmov/libc.so.6 #3 0x0806b510 in OspTaskDelay () #4 0x0805c710 in CDispatchTask::NodeMsgSendToSock() () #5 0x0805cc74 in DispatchTaskEntry () #6 0x0806a8e9 in OspTaskTemplateFunc(void*) () #7 0x00d4780e in start_thread () from /lib/tls/i686/cmov/libpthread.so.0 #8 0x002027ee in clone () from /lib/tls/i686/cmov/libc.so.6 ps + strace 得到进程ID 21465 ps -e grep cmu 4996 ? 00:00:25 cmu_fjga_sp3 21465 pts/5 00:08:10 cmu 得到线程时间, 其中最占CPU的是 EpollRecvTask 21581 ps -eL grep 21465 21465 21579 pts/5 00:00:00 CamApp 21465 21580 pts/5 00:00:00 TimerMan Task 21465 21581 pts/5 00:09:02 EpollRecvTask 21465 21582 pts/5 00:00:00 使用 strace -p 21581 得到线程栈
2、linux多任务系统是怎么跳出应用程序中的死循环的
ctrl+c 强制结束 或者另起一个终端 然后 ps -ef|grep 程序名 然后得到进程号 用kill -9 进程号
3、linux gdb 怎么定位死循环
找出调用栈
使用gdb attach nmsagent所在的进程,在gdb中使用 info threads显示所有线程
gdb gdbattach 2907
gdbinfo threads
得到如下结果,可以发现2909线程的编号是12
13 Thread 0xad5f2b70 (LWP 2908) 0x004ef0d7 in mq_timedreceive () from /lib/tls/i686/cmov/librt.so.1
12 Thread 0xad58eb70 (LWP 2909) 0x006e0422 in __kernel_vsyscall ()
11 Thread 0xad52ab70 (LWP 2910) 0x006e0422 in __kernel_vsyscall ()
10 Thread 0xad4f8b70 (LWP 2911) 0x006e0422 in __kernel_vsyscall ()
9 Thread 0xad4c6b70 (LWP 2912) 0x006e0422 in __kernel_vsyscall ()
8 Thread 0xad3feb70 (LWP 2913) 0x004ef0d7 in mq_timedreceive () from /lib/tls/i686/cmov/librt.so.1
7 Thread 0xace08b70 (LWP 2914) 0x004ef0d7 in mq_timedreceive () from /lib/tls/i686/cmov/librt.so.1
6 Thread 0xac607b70 (LWP 2915) 0x006e0422 in __kernel_vsyscall ()
5 Thread 0xac5e6b70 (LWP 2916) 0x006e0422 in __kernel_vsyscall ()
4 Thread 0xac361b70 (LWP 2917) 0x006e0422 in __kernel_vsyscall ()
3 Thread 0xac2fdb70 (LWP 2918) 0x006e0422 in __kernel_vsyscall ()
2 Thread 0xac1fcb70 (LWP 2919) 0x004ef0d7 in mq_timedreceive () from /lib/tls/i686/cmov/librt.so.1
* 1 Thread 0xb78496d0 (LWP 2907) 0x006e0422 in __kernel_vsyscall ()
使用thread 切换线程,使用bt显示线程栈
gdbthread 12 gdbbt
得到如下线程栈
#0 0x006e0422 in __kernel_vsyscall ()
#1 0x001cca26 in nanosleep () from /lib/tls/i686/cmov/libc.so.6
#2 0x001fc2dc in usleep () from /lib/tls/i686/cmov/libc.so.6
#3 0x0806b510 in OspTaskDelay ()
#4 0x0805c710 in CDispatchTask::NodeMsgSendToSock() ()
#5 0x0805cc74 in DispatchTaskEntry ()
#6 0x0806a8e9 in OspTaskTemplateFunc(void*) ()
#7 0x00d4780e in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#8 0x002027ee in clone () from /lib/tls/i686/cmov/libc.so.6
ps + strace
得到进程ID 21465 ps -e |grep cmu 4996 ? 00:00:25 cmu_fjga_sp3 21465 pts/5 00:08:10 cmu
得到线程时间, 其中最占CPU的是 EpollRecvTask 21581
ps -eL |grep 21465
21465 21579 pts/5 00:00:00 CamApp
21465 21580 pts/5 00:00:00 TimerMan Task
21465 21581 pts/5 00:09:02 EpollRecvTask
21465 21582 pts/5 00:00:00
使用 strace -p 21581 得到线程栈
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