Re: [Caml-list] memory usage

["Jean Krivine" <jean_krivine@hms.harvard.edu>]

Dear all

I downloaded the last version of ocaml (3.10.2) but I must confess I
don't know what option I should pass to the compiler to make a binary
that uses 64 bits.
I tried naively ocamlopt -ccopt -arch -ccopt x86_64 but that doesn't
work. Any idea?



On Fri, Jul 11, 2008 at 6:01 PM, Richard Jones <rich@annexia.org> wrote:
> On Fri, Jul 11, 2008 at 03:49:26PM -0400, Jean Krivine wrote:
>> I am trying to run a stochastic simulator (written in ocaml) on a huge
>> data set and I have the following error message:
>
> I can confirm that OCaml works fine with huge datasets, on 64 bit
> platforms anyway.
>
>> sim(9595) malloc: *** mmap(size=1048576) failed (error code=12)
>> *** error: can't allocate region
>> *** set a breakpoint in malloc_error_break to debug
>> Fatal error: out of memory.
>>
>> My system:
>>
>> Mac Pro running OS X 10.5.4
>> Processor:  2 x 2.8 GHz Quad-Core Intel Xeon
>> Memory:  10 GB 800 MHz DDR2 FB-DIMM
>>
>> Does someone know what happened? Do you have any idea of any parameter
>> I could tune in order to avoid that?
>
> Is the compiler 32 bits or 64 bits on this machine?  Try doing:
>
>  $ ocaml
>  # Sys.word_size ;;
>
> It should print out either '32' or '64'.
>
> Also run your program under whatever the OS X equivalent of 'strace'
> is (ktrace?) to find out exactly why the mmap call fails.
>
> OCaml <= 3.10.2 on Linux suffers a nasty problem with its use of mmap
> and randomized address spaces
> (https://bugzilla.redhat.com/show_bug.cgi?id=445545#c9) but it doesn't
> seem like this is the same issue.
>
> Rich.
>
> --
> Richard Jones
> Red Hat
>
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