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Date: Thu, 11 Oct 2012 22:05:41 -0700
Message-ID: <CAOZAnVPkQOsLbRqPK3rgnEEV7+N8XymYk2v6ZycicH9_95c...@mail.gmail.com>
From: Code Box <codeith...@gmail.com>
To: Michael Truog <mjtr...@gmail.com>
Cc: erlang-questi...@erlang.org
Subject: Re: [erlang-questions] Timeout Erlang GenServer Crash Loop
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Will it not relate to any CPU Stats of my host and also any memory stats of
my host that the process is overloaded ? I see CPU % usage as just 50% ?

On Thu, Oct 11, 2012 at 9:14 PM, Michael Truog <mjtr...@gmail.com> wrote:

> **
> On 10/11/2012 09:03 PM, Code Box wrote:
>
> ** Reason for termination ==
> ** {timeout,{gen_server,call,[thetime,gettime]}}
>
>  =CRASH REPORT==== 2012-10-09 05:37:04 UTC ===
>   crasher:
>     initial call: process_listener:-init/1-fun-2-/0
>     pid: <0.12376.513>
>     registered_name: []
>     exception exit: {timeout,{gen_server,call,[thetime,gettime]}}
>       in function  gen_server:terminate/6
>     ancestors: [incoming_req_processor,incoming_sup,top_process_sup,
>                   <0.52.0>]
>     messages: []
>     links: []
>     dictionary: [{random_seed,{23375,22820,17046}}]
>     trap_exit: true
>     status: running
>      heap_size: 6765
>     stack_size: 24
>     reductions: 1646842
>   neighbours:
>
>  I am seeing a lot of these messages in my Crash Reports. Once this
> reaches this it goes into this crash loop for quite a while. I am not sure
> how to debug this error. These timeouts are really annoying. Can some one
> help me understand the root cause of this?
>
>  Why does my genserver calls are facing timeouts ? Is it that my erlang
> VM is slow if so why ? How can i debug this issue to get to the root cause
> of it ?
>
>  If you look at gen_server:call/2 at
> http://www.erlang.org/doc/man/gen_server.html
> it shows the default Timeout is 5000 milliseconds (5 seconds).  Your
> gen_server process must have been processing for longer than 5 seconds
> while a gen_server:call/2 message was waiting in the process message queue,
> to cause the timeout exception.  So, it isn't the Erlang VM being slow, it
> is just an Erlang process that is overloaded (i.e., the "thetime"
> registered process).
>
>
>
>

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Will it not relate to any CPU Stats of my host and also any memory stats of=
 my host that the process is overloaded ? I see CPU % usage as just 50% ?<b=
r><br><div class=3D"gmail_quote">On Thu, Oct 11, 2012 at 9:14 PM, Michael T=
ruog <span dir=3D"ltr">&lt;<a href=3D"mailto:mjtr...@gmail.com" target=3D"_=
blank">mjtr...@gmail.com</a>&gt;</span> wrote:<br>
<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex"><u></u>

 =20
   =20
 =20
  <div bgcolor=3D"#ffffff" text=3D"#000000"><div><div class=3D"h5">
    On 10/11/2012 09:03 PM, Code Box wrote:
    <blockquote type=3D"cite">
     =20
      <div>** Reason for termination =3D=3D</div>
      <div>** {timeout,{gen_server,call,[thetime,gettime]}}</div>
      <div><br>
      </div>
      <div>=3DCRASH REPORT=3D=3D=3D=3D 2012-10-09 05:37:04 UTC =3D=3D=3D</d=
iv>
      <div>=A0 crasher:</div>
      <div>=A0 =A0 initial call: process_listener:-init/1-fun-2-/0</div>
      <div>=A0 =A0 pid: &lt;0.12376.513&gt;</div>
      <div>=A0 =A0 registered_name: []</div>
      <div>=A0 =A0 exception exit:
        {timeout,{gen_server,call,[thetime,gettime]}}</div>
      <div>=A0 =A0 =A0 in function =A0gen_server:terminate/6</div>
      <div>=A0 =A0 ancestors:
        [incoming_req_processor,incoming_sup,top_process_sup,</div>
      <div>=A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 &lt;0.52.0&gt;]</div>
      <div>=A0 =A0 messages: []</div>
      <div>=A0 =A0 links: []</div>
      <div>=A0 =A0 dictionary: [{random_seed,{23375,22820,17046}}]</div>
      <div>=A0 =A0 trap_exit: true</div>
      <div>=A0 =A0 status: running</div>
      <div>
        =A0 =A0 heap_size: 6765</div>
      <div>=A0 =A0 stack_size: 24</div>
      <div>=A0 =A0 reductions: 1646842</div>
      <div>=A0 neighbours:</div>
      <div><br>
      </div>
      <div>I am seeing a lot of these messages in my Crash Reports. Once
        this reaches this it goes into this crash loop for quite a
        while. I am not sure how to debug this error. These timeouts are
        really annoying. Can some one help me understand the root cause
        of this?</div>
      <div><br>
      </div>
      <div>Why does my genserver calls are facing timeouts ? Is it that
        my erlang VM is slow if so why ? How can i debug this issue to
        get to the root cause of it ?=A0</div>
      <div><br>
      </div>
    </blockquote></div></div>
    If you look at gen_server:call/2 at
    <a href=3D"http://www.erlang.org/doc/man/gen_server.html" target=3D"_bl=
ank">http://www.erlang.org/doc/man/gen_server.html</a><br>
    it shows the default Timeout is 5000 milliseconds (5 seconds).=A0 Your
    gen_server process must have been processing for longer than 5
    seconds while a gen_server:call/2 message was waiting in the process
    message queue, to cause the timeout exception.=A0 So, it isn&#39;t the
    Erlang VM being slow, it is just an Erlang process that is
    overloaded (i.e., the &quot;thetime&quot; registered process).<br>
    <br>
    <br>
    <br>
  </div>

</blockquote></div><br>

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