dbg question

[Siri Hansen (EAB)]

That sounds correct - in details it should look like this:

1) Start tracer on the node you want to trace and set your trace flags
   and patterns, e.g.:

(node1@REDACTED)1> dbg:tracer(port,dbg:trace_port(ip,4711)).
{ok,<0.36.0>}
(node1@REDACTED)2> %% Example: set the call trace flag
(node1@REDACTED)2> dbg:p(all,call).
{ok,[{matched,node1@REDACTED,32}]}
(node1@REDACTED)3> 
(node1@REDACTED)3> %% Example: Set a trace pattern on function erlang:time/0
(node1@REDACTED)3> dbg:tp(erlang,time,0,[]).
{ok,[{matched,node1@REDACTED,1}]}
(node1@REDACTED)4> 


2) Start the trace client on the other node, e.g.:

(node2@REDACTED)1> dbg:trace_client(ip,{"bilbo",4711}).
<0.36.0>
(node2@REDACTED)2> 

3) Run your test or whatever on the first node, e.g.:

(node1@REDACTED)4> erlang:time(). % I've set a trace pattern on this function
{14,18,3}
(node1@REDACTED)5> 

4) The trace printout should now appear on the client node:

(<4669.33.0>) call erlang:time()


/siri


Robert Balogh wrote:
> Hi Siri,
> 
> Ok, I understand now...:-)
> 
> Can I have an another question about it? So I'd like to trace an erlang node 
> which is outside from my workstation (this node is an another WS).  How can 
> I do this?
> I think, I can see the trace from the remote node if I start the 
> dbg:tracer(.....) on my WS and start the dbg client on the remote WS and the 
> client will to "forward" all messages to the IP port (to my WS). Am I right?
> 
> thank you for your help,
> /Robi
> 
> 
> >From: "Siri Hansen (EAB)" <siri@REDACTED>
> >Reply-To: siri@REDACTED
> >To: "Robert Balogh" <baloghrobi@REDACTED>
> >CC: erlang-questions@REDACTED
> >Subject: Re: dbg question
> >Date: Tue, 3 Feb 2004 08:32:13 +0100
> >
> >Hi Robert!
> >
> >For me it works when the trace port is started first. The client needs
> >a trace port which it can connect to, else it crashes with connection
> >refused.
> >
> >I agree that it is a bit strange that there is no error returned -
> >I'll look into that. But given the current situation, try linking to
> >the Pid to see the error message:
> >
> >1> Pid = dbg:trace_client(ip,4711),link(Pid).
> >true
> >** exited: {error,econnrefused} **
> >2> is_process_alive(Pid).
> >false
> >3>
> >
> >
> >Starting the trace port first works for me:
> >
> >4> dbg:tracer(port, dbg:trace_port(ip,4711)).
> >{ok,<0.39.0>}
> >5> Pid = dbg:trace_client(ip,4711).
> ><0.41.0>
> >6> is_process_alive(Pid).
> >true
> >7>
> >
> >BR Siri
> >Erlang/OTP
> >
> >
> >Robert Balogh wrote:
> > >
> > > Hi Vlad,
> > >
> > > I already tried it, but unfortunatelly it has same behavior...it is not
> > > possible to stop the client process, beacuese it is never started (???). 
> >But
> > > I really don't understand why say "ok,Pid" result when I create the 
> >cleint.
> > > I think I have a big mistake now....
> > > I already read the documentation, but...it is not enough...for me :-(
> > >
> > > I did that, what is in the documentation in the dbg side step-by-step, 
> >but
> > > it doesn't works for me...:-(((
> > >
> > > thanks a lot for your advice,
> > >
> > > regards,
> > > /Robi
> > >
> > >
> > > >From: "Vlad Dumitrescu" <vlad_dumitrescu@REDACTED>
> > > >To: <erlang-questions@REDACTED>
> > > >Subject: Re: dbg question
> > > >Date: Mon, 2 Feb 2004 13:48:58 +0100
> > > >
> > > >Hi,
> > > >
> > > >I think the dbg:tracer must be started with something like this:
> > > >
> > > >     dbg:tracer(port, dbg:trace_port(ip,4711)).
> > > >
> > > >(see the documentation)
> > > >
> > > >/Vlad
> > > >
> > > > > I think the dbg:tracer(). is start the dbg server, but I'd like to 
> >start
> > > > > only the dbg client. But I did what you advice to me. Please see the
> > > > > resulst. It is same what I had before.
> > > > > I don't know how possible to start the dbg client. :-((
> > > > >
> > > > > Any other idea....??
> > > > >
> > > > > Erlang (BEAM) emulator version 5.3 [threads:0]
> > > > >
> > > > > Eshell V5.3  (abort with ^G)
> > > > > (axd301@REDACTED)1> dbg:tracer().
> > > > > {ok,<0.37.0>}
> > > > > (axd301@REDACTED)2> Pid = dbg:trace_client(ip, {"cp1-1", 4711}).
> > > > > <0.40.0>
> > > > > (axd301@REDACTED)3> is_pid(Pid).
> > > > > true
> > > > > (axd301@REDACTED)4> is_process_alive(Pid).
> > > > > false
> > > > > (axd301@REDACTED)5> dbg:stop
> > > > > stop/0               stop_clear/0         stop_trace_client/1
> > > > >
> > > > > (axd301@REDACTED)5> dbg:stop_trace_client(Pid).
> > > > >
> > > > > =ERROR REPORT==== 2-Feb-2004::12:53:03 ===
> > > > > Error in process <0.30.0> on node 'axd301@REDACTED' with exit value:
> > > > > {badarg,[{erla
> > > > >
> > > 
> > >ng,exit,[{badpid,<0.40.0>},abnormal]},{dbg,stop_trace_client,1},{erl_eval,do_app
> > > > > ly,5},{shell,eval_loop,2}]}
> > > > >
> > > > > ** exited: {badarg,[{erlang,exit,[{badpid,<0.40.0>},abnormal]},
> > > > >                     {dbg,stop_trace_client,1},
> > > > >                     {erl_eval,do_apply,5},
> > > > >                     {shell,eval_loop,2}]} **
> > > > > (axd301@REDACTED)6>
> > > > >
> > >
> > > _________________________________________________________________
> > > STOP MORE SPAM with the new MSN 8 and get 2 months FREE*
> > > http://join.msn.com/?page=features/junkmail
> >

This communication is confidential and intended solely for the addressee(s). Any unauthorized review, use, disclosure or distribution is prohibited. If you believe this message has been sent to you in error, please notify the sender by replying to this transmission and delete the message without disclosing it. Thank you.

E-mail including attachments is susceptible to data corruption, interruption, unauthorized amendment, tampering and viruses, and we only send and receive e-mails on the basis that we are not liable for any such corruption, interception, amendment, tampering or viruses or any consequences thereof.