[erlang-questions] PLT for R15B

Olivier BOUDEVILLE <>
Thu Jan 5 11:27:03 CET 2012


Hi,

Not exactly, the computers we use routinely have at least 8GB of RAM, so 
we hadn't noticed anything until trying to do the same with older laptops.

I was thinking that due to the better compactness of 32-bit VMs and to the 
potential use of swap (I *suppose* it was used indeed) this could have 
worked on these computers, but even in a lean and mean context with as 
much memory freed as possible before launching Dialyzer, this could not do 
the trick.

Actually we integrated some time ago an automatic PLT generation into our 
custom script to install Erlang (from sources), this is why we ended up 
generating the PLT on different kinds of computers (not knowing to what 
extent we could build once for all a PLT for a given Erlang version; 
architectures and paths may differ, possibly causing issues). 

It boils down in our case to run: $dialyzer_exec --build_plt -r 
$erlang_beam_root --output_plt $actual_plt_file

and indeed it is quite long (less than two hours here, though) but 
terminates (provided there is enough RAM of course).

Not sure such a PLT could be generated incrementally in a simple manner 
with the same global level of checking?

Best regards,

Olivier.
---------------------------
Olivier Boudeville

EDF R&D : 1, avenue du Général de Gaulle, 92140 Clamart, France
Département SINETICS, groupe ASICS (I2A), bureau B-226
Office : +33 1 47 65 59 58 / Mobile : +33 6 16 83 37 22 / Fax : +33 1 47 
65 27 13



 
Envoyé par : 
05/01/2012 10:53
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Re: [erlang-questions] PLT for R15B






Greetings,

You mention that you no longer get memory exhaustion when building a PLT
for OTP. Is this correct? When I did

dialyzer -build_otp -r lib/*-0/ebin

I run out of memory on a 4 GB Linux machine.


bengt

On Thu, 2012-01-05 at 10:37 +0100, Olivier BOUDEVILLE wrote:
> 
> Hi, 
> 
> Just to report a few warnings that are output when generating the full
> PLT for R15B, as it may highlight a few minor defects: 
> 
> """ 
> client_server.erl:34: Call to missing or unexported function
> ssl:seed/1 
> client_server.erl:49: Call to missing or unexported function
> ssl:peercert/2 
> client_server.erl:66: Call to missing or unexported function
> ssl:peercert/2 
> eunit_test.erl:302: Call to missing or unexported function
> eunit_test:nonexisting_function/0 
> xrc.erl:124: Call to missing or unexported function
> wxXmlResource:reload/2 
> Unknown functions: 
>   asn1rt_driver_handler:load_driver/0 
>   wxWindows:'Destroy'/1 
>   wx_core:quit/0 
> """
> 
> On a side note, even before R15B, on some low-end computers (typically
> a 32-bit laptop with only 1GB of RAM, yet with some swap) we were not
> able anymore to generate that kind of full PLT, due to memory
> exhaustion. 
> 
> As for eunit_test:nonexisting_function/0, this does not look at all as
> a defect, so it might be interesting to be able to hide those expected
> warnings one way or another (dialyzer suppression files anyone?). 
> 
> Best regards, 
> 
> Olivier.
> ---------------------------
> Olivier Boudeville
> 
> EDF R&D : 1, avenue du Général de Gaulle, 92140 Clamart, France
> Département SINETICS, groupe ASICS (I2A), bureau B-226
> Office : +33 1 47 65 59 58 / Mobile : +33 6 16 83 37 22 / Fax : +33 1
> 47 65 27 13
> 
> 
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