dongtiao0279 2016-03-10 16:13
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是什么导致golang程序占用100%的CPU?

I have a golang program I wrote (it's an FTP server) that has 100% CPU when running. I see in strace:

futex(0xa83918, FUTEX_WAIT, 0, NULL

read(9, "", 4096)                       = 0
read(9, "", 4096)                       = 0
read(9, "", 4096)                       = 0
read(9, "", 4096)                       = 0
read(9, "", 4096)                       = 0

read(8, "", 4096)                       = 0
read(8, "", 4096)                       = 0
read(8, "", 4096)                       = 0
read(8, "", 4096)                       = 0
read(8, "", 4096)                       = 0

Over and over. It's caught in some infinite loop. It's main for loop is:

 for {
    tcpConn, err := listener.Accept()
    if err != nil {
      Server.logger.Print("listening error")
      break
    }   
    driver, err := Server.driverFactory.NewDriver()
    if err != nil {
      Server.logger.Print("Error creating driver, aborting client connection")
    } else {
      ftpConn := Server.newConn(tcpConn, driver, Server.Auth)
      go ftpConn.Serve()
    }   
  }

Any idea what is causing the infinite loop? When the program starts it's NOT in this bad state. It loops normally with normal cpu usage. It takes several hours of it running before it gets into this bad state.

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  • doufu1950 2016-06-07 06:22
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    Turns out this wasn't TCP related at all. This was a while loop in the code never ending because of a " " input issue. i.e. I had:

    for {
      if something {
        break;
      }
    }
    

    And it never broke.

    本回答被题主选为最佳回答 , 对您是否有帮助呢?
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