Linux下java服务占用cpu过高如何处理

1. top命令查看进程信息

   top
   

   

2. 按下shift+p,按cpu使用率排行,可见进程1932占用最高,并且是一个java服务

   

3. 使用jps命令确认java服务

   [root@VM-16-16-centos ~]# jps
   1011 Jps
   9462 yuan_back-0.0.1-SNAPSHOT.jar
   1932 spigot-1.18.jar
   

4. 查找异常进程中的异常线程

   top -H -p [pid]
   

   

5. 将异常线程的pid转为16进制

   printf "%x\n" pid
   

   [root@VM-16-16-centos ~]# printf "%x\n" 2035
   7f3
   

6. 使用jstack定位异常线程代码

   jstack [进程pid] | grep -A 10 [16进制线程pid]
   

   [root@VM-16-16-centos ~]# jstack 1932 | grep -A 10 7f3
   "Server thread" #22 prio=5 os_prio=0 cpu=690162281.71ms elapsed=4553857.35s tid=0x00007ff5ee745ac0 nid=0x7f3 runnable  [0x00007ff6019b9000]java.lang.Thread.State: RUNNABLEat net.minecraft.world.level.block.BlockFire.a(BlockFire.java:227)at net.minecraft.world.level.block.state.BlockBase$BlockData.a(BlockBase.java:911)at net.minecraft.server.level.WorldServer.d(WorldServer.java:776)at net.minecraft.server.level.WorldServer$$Lambda$4882/0x0000000801800678.accept(Unknown Source)at net.minecraft.world.ticks.TickListServer.a(SourceFile:215)at net.minecraft.world.ticks.TickListServer.a(SourceFile:98)at net.minecraft.server.level.WorldServer.a(WorldServer.java:341)at net.minecraft.server.MinecraftServer.b(MinecraftServer.java:1300)at net.minecraft.server.dedicated.DedicatedServer.b(DedicatedServer.java:428)
   

   这样就定位到异常代码,并可以进行具体分析了