[erlang-questions] Debugging embedded Erlang system

Fred Hebert <>
Sun Oct 23 15:06:40 CEST 2011


Stepping through the code works okay when you've got only sequential code,
but if you have a lot of code sensitive to timers and concurrency, then
stepping through the code of one process will mess with all the timers
currently running for other processes. As far as I know, there is no
debugging facility letting you pause the entire VM at once.

On Sun, Oct 23, 2011 at 1:31 AM, Kaiduan Xie <> wrote:

> I like and use trace, but my fellow developers are hard-cored JAVA
> developers, they want to be able to step through the code.
>
> /Kaiduan
>
> On Sun, Oct 23, 2011 at 1:27 AM, Chandru
> <> wrote:
> > On 21 October 2011 17:30, Kaiduan Xie <> wrote:
> >>
> >> Hi,
> >>
> >> We need to debug an Erlang server running in an embedded system where
> >> no GUI is available. We can attach an Erlang shell to the server from
> >> a remote box with GUI. Can we use debugger on GUI box to remote debug
> >> the server on embedded system? Can someone share the experience?
> >>
> >
> > You can use the in built trace facilities? I personally use dbg whenever
> I
> > need to look at a running system and figure out what is happening. Some
> care
> > is needed on what parts of the system you trace to make sure you don't
> swamp
> > the system with traces. I have rendered a few systems unsuable because of
> > the volume of tracing if the wrong trace pattern is chosen :) I typically
> > use something like this:
> >
> > dbg:tracer(port, dbg:trace_port(file, "trace_file.dbg")).
> > dbg:p(all,call).
> > dbg:tp(module, function, dbg:fun2ms(fun(_) -> return_trace() end)).
> >
> > Traces will now start to be written to the file trace_file.dbg
> >
> > Once you've collected enough traces:
> > dbg:ctp().
> > dbg:flush_trace_port().
> >
> > You can then examine the trace file (binary file) using commands in dbg.
> I
> > use the attached module to convert it to plain text.
> >
> > Or you can take a look at redbug: https://code.google.com/p/eper/
> >
> > cheers
> > Chandru
> >
> >
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