1、TOP命令,找到占用CPU最高的进程
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$ top
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top - 20:11:45 up 850 days, 1:18, 3 users, load average: 1.04, 1.01, 0.99
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Tasks: 61 total, 1 running, 60 sleeping, 0 stopped, 0 zombie
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Cpu(s): 1.4% us, 0.1% sy, 0.0% ni, 98.3% id, 0.1% wa, 0.0% hi, 0.2% si
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Mem: 16418172k total, 15693376k used, 724796k free, 1146696k buffers
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Swap: 10223608k total, 0k used, 10223608k free, 12537692k cached
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PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
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24714 ztgame 16 0 1409m 1.2g 4252 S 99.6 7.4 2390:57 IMVChannelServe
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1 root 16 0 4772 520 432 S 0.0 0.0 0:03.43 init
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2 root RT 0 0 0 0 S 0.0 0.0 0:05.75 migration/0
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3 root 34 19 0 0 0 S 0.0 0.0 5:22.97 ksoftirqd/0
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4 root RT 0 0 0 0 S 0.0 0.0 0:07.90 migration/1
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5 root 34 19 0 0 0 S 0.0 0.0 0:00.27 ksoftirqd/1
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6 root RT 0 0 0 0 S 0.0 0.0 0:04.07 migration/2
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7 root 34 19 0 0 0 S 0.0 0.0 0:00.47 ksoftirqd/2
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8 root RT 0 0 0 0 S 0.0 0.0 0:04.00 migration/3
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9 root 34 19 0 0 0 S 0.0 0.0 0:00.33 ksoftirqd/3
2、通过TOP -H -p 进程ID,找到具体的线程占用情况,Shift+H可以开启关闭线程显示
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$ top -H -p 24714
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top - 20:15:30 up 850 days, 1:22, 3 users, load average: 1.26, 1.09, 1.02
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Tasks: 16 total, 1 running, 15 sleeping, 0 stopped, 0 zombie
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Cpu(s): 24.8% us, 0.3% sy, 0.0% ni, 73.1% id, 0.0% wa, 0.0% hi, 1.8% si
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Mem: 16418172k total, 15701376k used, 716796k free, 1146704k buffers
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Swap: 10223608k total, 0k used, 10223608k free, 12546048k cached
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PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
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24729 ztgame 16 0 1409m 1.2g 4252 R 97.0 7.4 2307:22 IMVChannelServe
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24721 ztgame 15 0 1409m 1.2g 4252 S 2.0 7.4 84:22.40 IMVChannelServe
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24714 ztgame 16 0 1409m 1.2g 4252 S 0.0 7.4 0:03.80 IMVChannelServe
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24716 ztgame 15 0 1409m 1.2g 4252 S 0.0 7.4 0:00.00 IMVChannelServe
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24717 ztgame 15 0 1409m 1.2g 4252 S 0.0 7.4 0:00.04 IMVChannelServe
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24718 ztgame 15 0 1409m 1.2g 4252 S 0.0 7.4 0:00.00 IMVChannelServe
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24719 ztgame 15 0 1409m 1.2g 4252 S 0.0 7.4 0:00.08 IMVChannelServe
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24720 ztgame 15 0 1409m 1.2g 4252 S 0.0 7.4 0:00.01 IMVChannelServe
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24722 ztgame 15 0 1409m 1.2g 4252 S 0.0 7.4 0:00.00 IMVChannelServe
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24723 ztgame 16 0 1409m 1.2g 4252 S 0.0 7.4 0:00.00 IMVChannelServe
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24724 ztgame 15 0 1409m 1.2g 4252 S 0.0 7.4 0:00.01 IMVChannelServe
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24725 ztgame 15 0 1409m 1.2g 4252 S 0.0 7.4 0:09.83 IMVChannelServe
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24726 ztgame 15 0 1409m 1.2g 4252 S 0.0 7.4 0:00.00 IMVChannelServe
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24727 ztgame 15 0 1409m 1.2g 4252 S 0.0 7.4 0:00.76 IMVChannelServe
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24728 ztgame 16 0 1409m 1.2g 4252 S 0.0 7.4 0:00.53 IMVChannelServe
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24730 ztgame 16 0 1409m 1.2g 4252 S 0.0 7.4 2:42.18 IMVChannelServe
3、通过命令pstack 进程ID显示线程堆栈,LWP 24729对应线程ID的堆栈,就是占用CPU最高的堆栈,可以具体分析什么原因造成的。
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$ pstack 24714
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Thread 16 (Thread 1084229984 (LWP 24716)):
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#0 0x00000039c5a901d5 in __nanosleep_nocancel () from /lib64/tls/libc.so.6
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#1 0x00000039c5ac3058 in usleep () from /lib64/tls/libc.so.6
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#2 0x00000000005ebe10 in zVerifyThread::run ()
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#3 0x00000000005e9d29 in zThread::threadFunc ()
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#4 0x00000039c6106137 in start_thread () from /lib64/tls/libpthread.so.0
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#5 0x00000039c5ac9883 in clone () from /lib64/tls/libc.so.6
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Thread 15 (Thread 1094719840 (LWP 24717)):
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#0 0x00000039c5a901d5 in __nanosleep_nocancel () from /lib64/tls/libc.so.6
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#1 0x00000039c5ac3058 in usleep () from /lib64/tls/libc.so.6
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#2 0x00000000005ebe10 in zVerifyThread::run ()
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#3 0x00000000005e9d29 in zThread::threadFunc ()
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#4 0x00000039c6106137 in start_thread () from /lib64/tls/libpthread.so.0
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#5 0x00000039c5ac9883 in clone () from /lib64/tls/libc.so.6
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Thread 14 (Thread 1105209696 (LWP 24718)):
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#0 0x00000039c5a901d5 in __nanosleep_nocancel () from /lib64/tls/libc.so.6
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#1 0x00000039c5ac3058 in usleep () from /lib64/tls/libc.so.6
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#2 0x00000000005ebe10 in zVerifyThread::run ()
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#3 0x00000000005e9d29 in zThread::threadFunc ()
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#4 0x00000039c6106137 in start_thread () from /lib64/tls/libpthread.so.0
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#5 0x00000039c5ac9883 in clone () from /lib64/tls/libc.so.6
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Thread 13 (Thread 1115699552 (LWP 24719)):
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#0 0x00000039c5a901d5 in __nanosleep_nocancel () from /lib64/tls/libc.so.6
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#1 0x00000039c5ac3058 in usleep () from /lib64/tls/libc.so.6
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#2 0x00000000005ebe10 in zVerifyThread::run ()
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#3 0x00000000005e9d29 in zThread::threadFunc ()
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#4 0x00000039c6106137 in start_thread () from /lib64/tls/libpthread.so.0
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#5 0x00000039c5ac9883 in clone () from /lib64/tls/libc.so.6
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Thread 3 (Thread 1220598112 (LWP 24729)):
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#0 0x00000039c5a71e87 in memset () from /lib64/tls/libc.so.6
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#1 0x00000000004fa591 in ChannelTask::forwardToClientByMedia ()
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#2 0x0000000000506220 in ChannelTask::parseClientMsg_Normal ()
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#3 0x000000000051ef55 in ChannelTask::parseClientMsg ()
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#4 0x000000000051f070 in ChannelTask::cmdMsgParse_Forward ()
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#5 0x000000000051f1d1 in ChannelTask::cmdMsgParse ()
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#6 0x000000000051f414 in ChannelTask::processCmd ()
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#7 0x0000000000523ea8 in ChannelTaskManager::processCmd ()
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#8 0x0000000000525ddd in ChannelTimeTick::run ()
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#9 0x00000000005e9d29 in zThread::threadFunc ()
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#10 0x00000039c6106137 in start_thread () from /lib64/tls/libpthread.so.0
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#11 0x00000039c5ac9883 in clone () from /lib64/tls/libc.so.6
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Thread 2 (Thread 1231087968 (LWP 24730)):
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#0 0x00000039c610af8b in __lll_mutex_lock_wait ()
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#1 0x0000000000000001 in ?? ()
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#2 0x0000000000000065 in ?? ()
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#3 0x00000039c6107d87 in pthread_mutex_lock () from /lib64/tls/libpthread.so.0
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#4 0x0000003a500ae29e in operator delete () from /usr/lib64/libstdc++.so.6
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#5 0x000000000053f59d in ChannelLoadClient::processCmd_DB ()
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#6 0x00000000005986c9 in GameAppClient::processTaskCmd_DB ()
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#7 0x00000039c5a901e3 in __nanosleep_nocancel () from /lib64/tls/libc.so.6
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#8 0x0000000000000000 in ?? ()
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Thread 1 (Thread 182894183104 (LWP 24714)):
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#0 0x00000039c5ac9c5c in epoll_wait () from /lib64/tls/libc.so.6
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#1 0x0000000000620cac in zTCPServer::accept ()
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#2 0x00000000005f9c0d in zNetService::serviceCallback ()
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#3 0x00000000005f89e3 in zService::main ()
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#4 0x0000000000564298 in main ()
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