JVM问题排查
1、获取java进程
ps -ef|grep java
2、查看进程中，线程使用的CPU
top -H -p 2128
[root@alipayap01_test bin]# top -H -p2128 top - 08:49:52 up 170 days, 23:04, 6 users, load average: 0.06, 0.09, 0.09 Tasks: 21 total, 0 running, 21 sleeping, 0 stopped, 0 zombie Cpu(s): 0.6%us, 0.3%sy, 2.2%ni, 93.8%id, 2.9%wa, 0.0%hi, 0.2%si, 0.0%st Mem: 8174464k total, 8096600k used, 77864k free, 472244k buffers Swap: 16777208k total, 122952k used, 16654256k free, 510808k cached PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 2128 root 18 0 5648m 1.1g 3896 S 0.0 14.2 0:00.00 java 2129 root 19 0 5648m 1.1g 3896 S 0.0 14.2 0:11.52 java 2130 root 18 0 5648m 1.1g 3896 S 0.0 14.2 0:00.00 (Signal Handler 2131 root 15 0 5648m 1.1g 3896 S 0.0 14.2 0:08.72 (OC Main Thread 2132 root 16 0 5648m 1.1g 3896 S 0.0 14.2 2:10.21 (GC Worker Thre 2133 root 16 0 5648m 1.1g 3896 S 0.0 14.2 2:10.42 (GC Worker Thre 2134 root 16 0 5648m 1.1g 3896 S 0.0 14.2 2:10.52 (GC Worker Thre 2135 root 16 0 5648m 1.1g 3896 S 0.0 14.2 2:10.43 (GC Worker Thre 2136 root 15 0 5648m 1.1g 3896 S 0.0 14.2 0:00.02 (Code Generatio 2137 root 16 0 5648m 1.1g 3896 S 0.0 14.2 1:06.06 (Code Optimizat 2138 root 19 4 5648m 1.1g 3896 S 0.0 14.2 48:17.84 (VM Periodic Ta 2139 root 15 0 5648m 1.1g 3896 S 0.0 14.2 0:00.00 Finalizer 2140 root 15 0 5648m 1.1g 3896 S 0.0 14.2 0:00.00 Reference Handl 2141 root 23 0 5648m 1.1g 3896 S 0.0 14.2 0:00.00 (Sensor Event T 2142 root 24 0 5648m 1.1g 3896 S 0.0 14.2 0:00.00 VM JFR Buffer T 2284 root 15 0 5648m 1.1g 3896 S 0.0 14.2 0:00.03 pp-online-serve 2285 root 19 0 5648m 1.1g 3896 S 0.0 14.2 0:00.00 pp-online-admin 2286 root 20 0 5648m 1.1g 3896 S 0.0 14.2 0:00.00 Timer-0 2287 root 15 0 5648m 1.1g 3896 S 0.0 14.2 195:30.66 Timer-1 9366 root 15 0 5648m 1.1g 3896 S 0.0 14.2 0:00.03 Timer-2 11842 root 16 0 5648m 1.1g 3896 S 0.0 14.2 0:00.00 (Attach Listene
3、相信线程信息
./jrcmd 2128 print_threads
[root@alipayap01_test bin]# ./jrcmd 2128 print_threads 2128: ===== FULL THREAD DUMP =============== Mon Jun 19 08:49:31 2017 Oracle JRockit(R) R28.2.7-7-155314-1.6.0_45-20130329-0641-linux-x86_64 "(Signal Handler)" id=2 idx=0x8 tid=2130 prio=5 alive, native_blocked, daemon "(OC Main Thread)" id=3 idx=0xc tid=2131 prio=5 alive, native_waiting, daemon "(GC Worker Thread 1)" id=? idx=0x10 tid=2132 prio=5 alive, daemon "(GC Worker Thread 2)" id=? idx=0x14 tid=2133 prio=5 alive, daemon "(GC Worker Thread 3)" id=? idx=0x18 tid=2134 prio=5 alive, daemon "(GC Worker Thread 4)" id=? idx=0x1c tid=2135 prio=5 alive, daemon "(Code Generation Thread 1)" id=4 idx=0x20 tid=2136 prio=5 alive, native_waiting, daemon "(Code Optimization Thread 1)" id=5 idx=0x24 tid=2137 prio=5 alive, native_waiting, daemon "(VM Periodic Task)" id=6 idx=0x28 tid=2138 prio=10 alive, native_blocked, daemon "Finalizer" id=7 idx=0x2c tid=2139 prio=8 alive, native_waiting, daemon at jrockit/memory/Finalizer.waitForFinalizees(J[Ljava/lang/Object;)I(Native Method) at jrockit/memory/Finalizer.access$700(Finalizer.java:12) at jrockit/memory/Finalizer$4.run(Finalizer.java:201) at java/lang/Thread.run(Thread.java:662) at jrockit/vm/RNI.c2java(JJJJJ)V(Native Method) -- end of trace "Reference Handler" id=8 idx=0x30 tid=2140 prio=10 alive, native_waiting, daemon at java/lang/ref/Reference.waitForActivatedQueue(J)Ljava/lang/ref/Reference;(Native Method) at java/lang/ref/Reference.access$100(Reference.java:11) at java/lang/ref/Reference$ReferenceHandler.run(Reference.java:82) at jrockit/vm/RNI.c2java(JJJJJ)V(Native Method) -- end of trace "(Sensor Event Thread)" id=9 idx=0x34 tid=2141 prio=5 alive, native_blocked, daemon "VM JFR Buffer Thread" id=10 idx=0x38 tid=2142 prio=5 alive, in native, daemon "pp-online-server(epayap:8200)-main" id=139 idx=0x238 tid=2284 prio=5 alive, in native at java/net/PlainSocketImpl.socketAccept(Ljava/net/SocketImpl;)V(Native Method) at java/net/PlainSocketImpl.accept(PlainSocketImpl.java:408) ^-- Holding lock: java/net/SocksSocketImpl@0x100da9fb0[biased lock] at java/net/ServerSocket.implAccept(ServerSocket.java:462) at java/net/ServerSocket.accept(ServerSocket.java:430) at com/csii/pe/service/comm/tcp/TcpServer$1.run()V(Unknown Source) at java/lang/Thread.run(Thread.java:662) at jrockit/vm/RNI.c2java(JJJJJ)V(Native Method) -- end of trace "pp-online-adminserver(*:18001)-main" id=140 idx=0x23c tid=2285 prio=5 alive, in native at java/net/PlainSocketImpl.socketAccept(Ljava/net/SocketImpl;)V(Native Method) at java/net/PlainSocketImpl.accept(PlainSocketImpl.java:408) ^-- Holding lock: java/net/SocksSocketImpl@0x100d92fb8[biased lock] at java/net/ServerSocket.implAccept(ServerSocket.java:462) at java/net/ServerSocket.accept(ServerSocket.java:430) at com/csii/pe/service/comm/tcp/TcpServer$1.run()V(Unknown Source) at java/lang/Thread.run(Thread.java:662) at jrockit/vm/RNI.c2java(JJJJJ)V(Native Method) -- end of trace "Timer-0" id=141 idx=0x240 tid=2286 prio=5 alive, waiting, native_blocked -- Waiting for notification on: java/util/TaskQueue@0x100e51858[fat lock] at jrockit/vm/Threads.waitForNotifySignal(JLjava/lang/Object;)Z(Native Method) at java/lang/Object.wait(J)V(Native Method) at java/util/TimerThread.mainLoop(Timer.java:509) ^-- Lock released while waiting: java/util/TaskQueue@0x100e51858[fat lock] at java/util/TimerThread.run(Timer.java:462) at jrockit/vm/RNI.c2java(JJJJJ)V(Native Method) -- end of trace "Timer-1" id=142 idx=0x244 tid=2287 prio=5 alive, waiting, native_blocked -- Waiting for notification on: java/util/TaskQueue@0x100e518d8[fat lock] at jrockit/vm/Threads.waitForNotifySignal(JLjava/lang/Object;)Z(Native Method) at java/lang/Object.wait(J)V(Native Method) at java/util/TimerThread.mainLoop(Timer.java:509) ^-- Lock released while waiting: java/util/TaskQueue@0x100e518d8[fat lock] at java/util/TimerThread.run(Timer.java:462) at jrockit/vm/RNI.c2java(JJJJJ)V(Native Method) -- end of trace "attached" id=144 idx=0x248 tid=2129 prio=5 alive, native_waiting, daemon "Timer-2" id=177 idx=0x2cc tid=9366 prio=5 alive, waiting, native_blocked, daemon -- Waiting for notification on: java/util/TaskQueue@0x100a0c8f8[fat lock] at jrockit/vm/Threads.waitForNotifySignal(JLjava/lang/Object;)Z(Native Method) at java/lang/Object.wait(J)V(Native Method) at java/util/TimerThread.mainLoop(Timer.java:509)[inlined] at java/util/TimerThread.run(Timer.java:462)[optimized] ^-- Lock released while waiting: java/util/TaskQueue@0x100a0c8f8[fat lock] at jrockit/vm/RNI.c2java(JJJJJ)V(Native Method) -- end of trace "(Attach Listener)" id=223 idx=0x384 tid=11842 prio=5 alive, daemon ===== END OF THREAD DUMP ===============
./jrcmd 2128 help
[root@alipayap01_test bin]# ./jrcmd 2128 help 2128: The following commands are available: kill_management_server start_management_server print_object_summary memleakserver print_class_summary print_codeblocks dump_codelayout dump_codelist dump_codemap print_codegenlist exception_trace_filter print_vm_state print_utf8pool check_flightrecording dump_flightrecording stop_flightrecording start_flightrecording print_properties hprofdump print_threads datadump_request runsystemgc runfinalization heap_diagnostics oom_diagnostics print_exceptions version timestamp command_line sanity verbosity set_filename help print_memusage set_vmflag list_vmflags
./jrcmd 2128 print_threads 或者 jstack 2128
4、trace追踪
追踪线程id=2284
strace -t -T -e trace=all -p 12203
[root@alipayap01_test bin]# strace -t -T -e trace=all -p 12203 Process 12203 attached - interrupt to quit 09:09:22 accept(185, {sa_family=AF_INET, sin_port=htons(58714), sin_addr=inet_addr("195.203.6.163")}, [6549641241670189072]) = 75 <13.636115> 09:09:35 futex(0x15b2d80c, FUTEX_WAKE_OP_PRIVATE, 1, 1, 0x15b2d808, {FUTEX_OP_SET, 0, FUTEX_OP_CMP_GT, 1}) = 1 <0.000014> 09:09:35 accept(185, {sa_family=AF_INET, sin_port=htons(58715), sin_addr=inet_addr("195.203.6.163")}, [6621698835708117008]) = 83 <0.034538> 09:09:35 futex(0x15b0705c, FUTEX_WAKE_OP_PRIVATE, 1, 1, 0x15b07058, {FUTEX_OP_SET, 0, FUTEX_OP_CMP_GT, 1}) = 1 <0.000032> 09:09:35 futex(0x15b07030, FUTEX_WAKE_PRIVATE, 1) = 1 <0.000024> 09:09:35 futex(0x2aab000052e0, FUTEX_WAIT_PRIVATE, 2, NULL) = -1 EAGAIN (Resource temporarily unavailable) <0.000021> 09:09:35 futex(0x2aab000052e0, FUTEX_WAKE_PRIVATE, 1) = 0 <0.000018> 09:09:35 accept(185, {sa_family=AF_INET, sin_port=htons(58718), sin_addr=inet_addr("195.203.6.163")}, [6837871617821900816]) = 75 <0.488808> 09:09:36 futex(0x15b522ac, FUTEX_WAKE_OP_PRIVATE, 1, 1, 0x15b522a8, {FUTEX_OP_SET, 0, FUTEX_OP_CMP_GT, 1}) = 1 <0.000137> 09:09:36 accept(185,
-c 统计每一系统调用的所执行的时间,次数和出错的次数等. -d 输出strace关于标准错误的调试信息. -f 跟踪由fork调用所产生的子进程. -ff 如果提供-o filename,则所有进程的跟踪结果输出到相应的filename.pid中,pid是各进程的进程号. -F 尝试跟踪vfork调用.在-f时,vfork不被跟踪. -h 输出简要的帮助信息. -i 输出系统调用的入口指针. -q 禁止输出关于脱离的消息. -r 打印出相对时间关于,,每一个系统调用. -t 在输出中的每一行前加上时间信息. -tt 在输出中的每一行前加上时间信息,微秒级. -ttt 微秒级输出,以秒了表示时间. -T 显示每一调用所耗的时间. -v 输出所有的系统调用.一些调用关于环境变量,状态,输入输出等调用由于使用频繁,默认不输出. -V 输出strace的版本信息. -x 以十六进制形式输出非标准字符串 -xx 所有字符串以十六进制形式输出. -a column 设置返回值的输出位置.默认 为40. -e expr 指定一个表达式,用来控制如何跟踪.格式如下: [qualifier=][!]value1[,value2]... qualifier只能是 trace,abbrev,verbose,raw,signal,read,write其中之一.value是用来限定的符号或数字.默认的 qualifier是 trace.感叹号是否定符号.例如: -eopen等价于 -e trace=open,表示只跟踪open调用.而-etrace!=open表示跟踪除了open以外的其他调用.有两个特殊的符号 all 和 none. 注意有些shell使用!来执行历史记录里的命令,所以要使用\\. -e trace=set 只跟踪指定的系统 调用.例如:-e trace=open,close,rean,write表示只跟踪这四个系统调用.默认的为set=all. -e trace=file 只跟踪有关文件操作的系统调用. -e trace=process 只跟踪有关进程控制的系统调用. -e trace=network 跟踪与网络有关的所有系统调用. -e strace=signal 跟踪所有与系统信号有关的 系统调用 -e trace=ipc 跟踪所有与进程通讯有关的系统调用 -e abbrev=set 设定 strace输出的系统调用的结果集.-v 等与 abbrev=none.默认为abbrev=all. -e raw=set 将指 定的系统调用的参数以十六进制显示. -e signal=set 指定跟踪的系统信号.默认为all.如 signal=!SIGIO(或者signal=!io),表示不跟踪SIGIO信号. -e read=set 输出从指定文件中读出 的数据.例如: -e read=3,5 -e write=set 输出写入到指定文件中的数据. -o filename 将strace的输出写入文件filename -p pid 跟踪指定的进程pid. -s strsize 指定输出的字符串的最大长度.默认为32.文件名一直全部输出. -u username 以username 的UID和GID执行被跟踪的命令
strace -c >/dev/null ls
堆中对象
jmap -histo 23048|more
strace -t -T -e trace=all -p 23048 -f -s 1000 -o /tmp/asms1.log
