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查看Linux进程CPU过高具体的线程堆栈(不中断程序)
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轉自：http://blog.csdn.net/mergerly/article/details/47731305
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1、TOP命令，找到占用CPU最高的進程
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$?top????top?-?20:11:45?up?850?days,??1:18,??3?users,??load?average:?1.04,?1.01,?0.99??Tasks:??61?total,???1?running,??60?sleeping,???0?stopped,???0?zombie??Cpu(s):??1.4%?us,??0.1%?sy,??0.0%?ni,?98.3%?id,??0.1%?wa,??0.0%?hi,??0.2%?si??Mem:??16418172k?total,?15693376k?used,???724796k?free,??1146696k?buffers??Swap:?10223608k?total,????????0k?used,?10223608k?free,?12537692k?cached??????PID?USER??????PR??NI??VIRT??RES??SHR?S?%CPU?%MEM????TIME+??COMMAND??????????????????????????????????????????????????????????????????24714?ztgame????16???0?1409m?1.2g?4252?S?99.6??7.4???2390:57?IMVChannelServe??????????????????????????????????????????????????????????????1?root??????16???0??4772??520??432?S??0.0??0.0???0:03.43?init?????????????????????????????????????????????????????????????????????????2?root??????RT???0?????0????0????0?S??0.0??0.0???0:05.75?migration/0??????????????????????????????????????????????????????????????????3?root??????34??19?????0????0????0?S??0.0??0.0???5:22.97?ksoftirqd/0??????????????????????????????????????????????????????????????????4?root??????RT???0?????0????0????0?S??0.0??0.0???0:07.90?migration/1??????????????????????????????????????????????????????????????????5?root??????34??19?????0????0????0?S??0.0??0.0???0:00.27?ksoftirqd/1??????????????????????????????????????????????????????????????????6?root??????RT???0?????0????0????0?S??0.0??0.0???0:04.07?migration/2??????????????????????????????????????????????????????????????????7?root??????34??19?????0????0????0?S??0.0??0.0???0:00.47?ksoftirqd/2??????????????????????????????????????????????????????????????????8?root??????RT???0?????0????0????0?S??0.0??0.0???0:04.00?migration/3??????????????????????????????????????????????????????????????????9?root??????34??19?????0????0????0?S??0.0??0.0???0:00.33?ksoftirqd/3?????? ?
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2、通過TOP?-H -p 進程ID，找到具體的線程占用情況，Shift+H可以開啟關閉線程顯示
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$?top?-H?-p?24714????top?-?20:15:30?up?850?days,??1:22,??3?users,??load?average:?1.26,?1.09,?1.02??Tasks:??16?total,???1?running,??15?sleeping,???0?stopped,???0?zombie??Cpu(s):?24.8%?us,??0.3%?sy,??0.0%?ni,?73.1%?id,??0.0%?wa,??0.0%?hi,??1.8%?si??Mem:??16418172k?total,?15701376k?used,???716796k?free,??1146704k?buffers??Swap:?10223608k?total,????????0k?used,?10223608k?free,?12546048k?cached??????PID?USER??????PR??NI??VIRT??RES??SHR?S?%CPU?%MEM????TIME+??COMMAND??????????????????????????????????????????????????????????????????24729?ztgame????16???0?1409m?1.2g?4252?R?97.0??7.4???2307:22?IMVChannelServe??????????????????????????????????????????????????????????24721?ztgame????15???0?1409m?1.2g?4252?S??2.0??7.4??84:22.40?IMVChannelServe??????????????????????????????????????????????????????????24714?ztgame????16???0?1409m?1.2g?4252?S??0.0??7.4???0:03.80?IMVChannelServe??????????????????????????????????????????????????????????24716?ztgame????15???0?1409m?1.2g?4252?S??0.0??7.4???0:00.00?IMVChannelServe??????????????????????????????????????????????????????????24717?ztgame????15???0?1409m?1.2g?4252?S??0.0??7.4???0:00.04?IMVChannelServe??????????????????????????????????????????????????????????24718?ztgame????15???0?1409m?1.2g?4252?S??0.0??7.4???0:00.00?IMVChannelServe??????????????????????????????????????????????????????????24719?ztgame????15???0?1409m?1.2g?4252?S??0.0??7.4???0:00.08?IMVChannelServe??????????????????????????????????????????????????????????24720?ztgame????15???0?1409m?1.2g?4252?S??0.0??7.4???0:00.01?IMVChannelServe??????????????????????????????????????????????????????????24722?ztgame????15???0?1409m?1.2g?4252?S??0.0??7.4???0:00.00?IMVChannelServe??????????????????????????????????????????????????????????24723?ztgame????16???0?1409m?1.2g?4252?S??0.0??7.4???0:00.00?IMVChannelServe??????????????????????????????????????????????????????????24724?ztgame????15???0?1409m?1.2g?4252?S??0.0??7.4???0:00.01?IMVChannelServe??????????????????????????????????????????????????????????24725?ztgame????15???0?1409m?1.2g?4252?S??0.0??7.4???0:09.83?IMVChannelServe??????????????????????????????????????????????????????????24726?ztgame????15???0?1409m?1.2g?4252?S??0.0??7.4???0:00.00?IMVChannelServe??????????????????????????????????????????????????????????24727?ztgame????15???0?1409m?1.2g?4252?S??0.0??7.4???0:00.76?IMVChannelServe??????????????????????????????????????????????????????????24728?ztgame????16???0?1409m?1.2g?4252?S??0.0??7.4???0:00.53?IMVChannelServe??????????????????????????????????????????????????????????24730?ztgame????16???0?1409m?1.2g?4252?S??0.0??7.4???2:42.18?IMVChannelServe??????????????????????????????????????????????????????????
3、通過命令pstack 進程ID顯示線程堆棧，LWP 24729對應線程ID的堆棧，就是占用CPU最高的堆棧，可以具體分析什么原因造成的。
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$?pstack?24714??Thread?16?(Thread?1084229984?(LWP?24716)):??#0??0x00000039c5a901d5?in?__nanosleep_nocancel?()?from?/lib64/tls/libc.so.6??#1??0x00000039c5ac3058?in?usleep?()?from?/lib64/tls/libc.so.6??#2??0x00000000005ebe10?in?zVerifyThread::run?()??#3??0x00000000005e9d29?in?zThread::threadFunc?()??#4??0x00000039c6106137?in?start_thread?()?from?/lib64/tls/libpthread.so.0??#5??0x00000039c5ac9883?in?clone?()?from?/lib64/tls/libc.so.6??Thread?15?(Thread?1094719840?(LWP?24717)):??#0??0x00000039c5a901d5?in?__nanosleep_nocancel?()?from?/lib64/tls/libc.so.6??#1??0x00000039c5ac3058?in?usleep?()?from?/lib64/tls/libc.so.6??#2??0x00000000005ebe10?in?zVerifyThread::run?()??#3??0x00000000005e9d29?in?zThread::threadFunc?()??#4??0x00000039c6106137?in?start_thread?()?from?/lib64/tls/libpthread.so.0??#5??0x00000039c5ac9883?in?clone?()?from?/lib64/tls/libc.so.6??Thread?14?(Thread?1105209696?(LWP?24718)):??#0??0x00000039c5a901d5?in?__nanosleep_nocancel?()?from?/lib64/tls/libc.so.6??#1??0x00000039c5ac3058?in?usleep?()?from?/lib64/tls/libc.so.6??#2??0x00000000005ebe10?in?zVerifyThread::run?()??#3??0x00000000005e9d29?in?zThread::threadFunc?()??#4??0x00000039c6106137?in?start_thread?()?from?/lib64/tls/libpthread.so.0??#5??0x00000039c5ac9883?in?clone?()?from?/lib64/tls/libc.so.6??Thread?13?(Thread?1115699552?(LWP?24719)):??#0??0x00000039c5a901d5?in?__nanosleep_nocancel?()?from?/lib64/tls/libc.so.6??#1??0x00000039c5ac3058?in?usleep?()?from?/lib64/tls/libc.so.6??#2??0x00000000005ebe10?in?zVerifyThread::run?()??#3??0x00000000005e9d29?in?zThread::threadFunc?()??#4??0x00000039c6106137?in?start_thread?()?from?/lib64/tls/libpthread.so.0??#5??0x00000039c5ac9883?in?clone?()?from?/lib64/tls/libc.so.6??Thread?3?(Thread?1220598112?(LWP?24729)):??#0??0x00000039c5a71e87?in?memset?()?from?/lib64/tls/libc.so.6??#1??0x00000000004fa591?in?ChannelTask::forwardToClientByMedia?()??#2??0x0000000000506220?in?ChannelTask::parseClientMsg_Normal?()??#3??0x000000000051ef55?in?ChannelTask::parseClientMsg?()??#4??0x000000000051f070?in?ChannelTask::cmdMsgParse_Forward?()??#5??0x000000000051f1d1?in?ChannelTask::cmdMsgParse?()??#6??0x000000000051f414?in?ChannelTask::processCmd?()??#7??0x0000000000523ea8?in?ChannelTaskManager::processCmd?()??#8??0x0000000000525ddd?in?ChannelTimeTick::run?()??#9??0x00000000005e9d29?in?zThread::threadFunc?()??#10?0x00000039c6106137?in?start_thread?()?from?/lib64/tls/libpthread.so.0??#11?0x00000039c5ac9883?in?clone?()?from?/lib64/tls/libc.so.6??Thread?2?(Thread?1231087968?(LWP?24730)):??#0??0x00000039c610af8b?in?__lll_mutex_lock_wait?()??#1??0x0000000000000001?in????()??#2??0x0000000000000065?in????()??#3??0x00000039c6107d87?in?pthread_mutex_lock?()?from?/lib64/tls/libpthread.so.0??#4??0x0000003a500ae29e?in?operator?delete?()?from?/usr/lib64/libstdc++.so.6??#5??0x000000000053f59d?in?ChannelLoadClient::processCmd_DB?()??#6??0x00000000005986c9?in?GameAppClient::processTaskCmd_DB?()??#7??0x00000039c5a901e3?in?__nanosleep_nocancel?()?from?/lib64/tls/libc.so.6??#8??0x0000000000000000?in????()??Thread?1?(Thread?182894183104?(LWP?24714)):??#0??0x00000039c5ac9c5c?in?epoll_wait?()?from?/lib64/tls/libc.so.6??#1??0x0000000000620cac?in?zTCPServer::accept?()??#2??0x00000000005f9c0d?in?zNetService::serviceCallback?()??#3??0x00000000005f89e3?in?zService::main?()??#4??0x0000000000564298?in?main?() ?
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