前言：
眼前朋友们对“jstack定位g问题”可能比较注重，同学们都需要分析一些“jstack定位g问题”的相关文章。那么小编同时在网上搜集了一些关于“jstack定位g问题””的相关文章，希望小伙伴们能喜欢，各位老铁们快快来了解一下吧！步骤一：查看cpu占用高进程
执行top命令后，按shift+p 按cpu使用量排序
topMem: 16333644k total, 9472968k used, 6860676k free, 165616k buffersSwap: 0k total, 0k used, 0k free, 6665292k cached PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 17850 root 20 0 7588m 112m 11m S 100.7 0.7 47:53.80 java 1552 root 20 0 121m 13m 8524 S 0.7 0.1 14:37.75 AliYunDun 3581 root 20 0 9750m 2.0g 13m S 0.7 12.9 298:30.20 java 1 root 20 0 19360 1612 1308 S 0.0 0.0 0:00.81 init 2 root 20 0 0 0 0 S 0.0 0.0 0:00.00 kthreadd 3 root RT 0 0 0 0 S 0.0 0.0 0:00.14 migration/0步骤二：查看cpu占用高线程
通过第一步得到了进程号
通过top -Hp 进程号，查看具体的线程情况
top -H -p 17850top - 17:43:15 up 5 days, 7:31, 1 user, load average: 0.99, 0.97, 0.91Tasks: 32 total, 1 running, 31 sleeping, 0 stopped, 0 zombieCpu(s): 3.7%us, 8.9%sy, 0.0%ni, 87.4%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%stMem: 16333644k total, 9592504k used, 6741140k free, 165700k buffersSwap: 0k total, 0k used, 0k free, 6781620k cached PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND17880 root 20 0 7588m 112m 11m R 99.9 0.7 50:47.43 java17856 root 20 0 7588m 112m 11m S 0.3 0.7 0:02.08 java17850 root 20 0 7588m 112m 11m S 0.0 0.7 0:00.00 java17851 root 20 0 7588m 112m 11m S 0.0 0.7 0:00.23 java17852 root 20 0 7588m 112m 11m S 0.0 0.7 0:02.09 java17853 root 20 0 7588m 112m 11m S 0.0 0.7 0:02.12 java17854 root 20 0 7588m 112m 11m S 0.0 0.7 0:02.07 java步骤三：转换线程ID
通过第二步得到了线程17880有问题，转换成16进制，以便后续使用。
printf "%x\n" 17880 45d8步骤四：定位cpu占用线程
在jstack打印的堆栈信息中查询线程相关信息
jstack 17850|grep 45d8 -A 30"pool-1-thread-11" #20 prio=5 os_prio=0 tid=0x00007fc860352800 nid=0x45d8 runnable [0x00007fc8417d2000] java.lang.Thread.State: RUNNABLE at java.io.FileOutputStream.writeBytes(Native Method) at java.io.FileOutputStream.write(FileOutputStream.java:326) at java.io.BufferedOutputStream.flushBuffer(BufferedOutputStream.java:82) at java.io.BufferedOutputStream.flush(BufferedOutputStream.java:140) - locked <0x00000006c6c2e708> (a java.io.BufferedOutputStream) at java.io.PrintStream.write(PrintStream.java:482) - locked <0x00000006c6c10178> (a java.io.PrintStream) at sun.nio.cs.StreamEncoder.writeBytes(StreamEncoder.java:221) at sun.nio.cs.StreamEncoder.implFlushBuffer(StreamEncoder.java:291) at sun.nio.cs.StreamEncoder.flushBuffer(StreamEncoder.java:104) - locked <0x00000006c6c26620> (a java.io.OutputStreamWriter) at java.io.OutputStreamWriter.flushBuffer(OutputStreamWriter.java:185) at java.io.PrintStream.write(PrintStream.java:527) - eliminated <0x00000006c6c10178> (a java.io.PrintStream) at java.io.PrintStream.print(PrintStream.java:597) at java.io.PrintStream.println(PrintStream.java:736) - locked <0x00000006c6c10178> (a java.io.PrintStream) at com.demo.guava.HardTask.call(HardTask.java:18) at com.demo.guava.HardTask.call(HardTask.java:9) at java.util.concurrent.FutureTask.run(FutureTask.java:266) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) at java.lang.Thread.run(Thread.java:745)"pool-1-thread-10" #19 prio=5 os_prio=0 tid=0x00007fc860345000 nid=0x45d7 waiting on condition [0x00007fc8418d3000] java.lang.Thread.State: WAITING (parking) at sun.misc.Unsafe.park(Native Method) - parking to wait for <0x00000006c6c14178> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject) at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)
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