[erlang-questions] CT take a long time to warm up

Tim Watson <>
Thu Oct 11 10:45:11 CEST 2012


Whoa, this is fascinating Roberto. Did you try running common test from the shell by hand and see if it still happens, i.e., by running something like this:

ct:run_test([{logdir, LogDir},
                     {label, Label},
                     {auto_compile, true},
                     {suite, Suites}]).

Does the same thing happen?

On 11 Oct 2012, at 04:38, Roberto Ostinelli wrote:

> Ok,
> 
> I finally managed to track this down but I'm totally unsure why this happens. Motiejus, you were right.
> 
> When I run REBAR, the process automountd tries to connect on port 111 (sunrpc) on my local NAT. When it times out, the CT tests are actually run. If I simply block this process with a firewall, tests start immediately.
> 
> I'm at disposal if anyone wants to dig further (tuncer?)
> 
> r.
> 
> On Wed, Sep 26, 2012 at 1:38 PM, Tuncer Ayaz <> wrote:
> On Wed, Sep 26, 2012 at 9:44 PM, Motiejus Jakštys wrote:
> > On Wed, Sep 26, 2012 at 8:40 PM, Roberto Ostinelli wrote:
> > > > How do you run it? Consistent 20 seconds sounds like a DNS
> > > > timeout issue (stab in the dark).
> > >
> > >
> > > rebar ct_suites=mymodule
> >
> > Hi,
> > adding the list.
> >
> > Please do
> >
> > $TRACE_F rebar ct_suites=mymodule
> 
> Make that
> 
> $TRACE_F rebar suites=mymodule
> 
> and also consider running rebar with fprof:
> 
> $TRACE_F rebar -p suites=mymodule
> or
> $TRACE_F rebar --profile suites=mymodule
> 
> , but make sure you update rebar first to avoid a faulty
> call to fprof:apply/2.
> 
> If it's caused by name lookup, you can try a custom ERL_INETRC file:
> http://www.erlang.org/doc/apps/erts/inet_cfg.html
> 
> > and replace $TRACE_F with Max OS C equivalent of "strace -f".
> > Then see what it does just before the 20 second pause.
> 
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> 
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