Thank to my friend Yann Mauffrey, I have strongly reduce the required
virtual memory just by changing my mpi distribution. Under open-mpi 1.0.1
the required virtual memory is too important (600 MO) compare to the one I
need with lam-mpi (50 MO). I am going to send an email to open-mpi mail
list in order to inform then about this.




Christophe Peyret wrote:
> Hi,
>
> I agree, there are certainly memory leaks in my program and I wonder how
> can I identify then, where it happens ? I carrefully allocate and
> deallocate my allocatable or pointer variables but something doesn't seem
> to work....
>
> @+
> Christophe
>
>
> Stefan Pantos wrote:
>> Hi,
>>     Although I have no experience of xlf95. I think it really depends
>> on what you file is doing. If you have some kind of gui then nearly
>> 200MB will be just that. Do you have any files open and how have you
>> opened them. They may have been memory mapped. Check that you haven't
>> got any memory leaks(probably the most likely). It may be due to
>> optimisation but this is very unlikely.
>>
>> Either way it's not really something you can control easily with just
>> compiler options and unless you are using a very underpowered machine
>> it would make little difference.
>>
>> To get a better answer you will need to include some more details on
>> what the program is doing. Is it different on a different platform
>> with the exact same code? What does the gcc compiler do?
>>
>> Hope that is some help,
>> Stefan
>>
>> On 19 Dec 2005, at 20:03, fortran-dev-request@list... wrote:
>>> Date: Sun, 18 Dec 2005 22:14:24 +0100 (CET)
>>> From: "Christophe Peyret" <christophe.peyret@oner...>
>>> Subject: Real Memory and Virtual Memory
>>> To: fortran-dev@list...
>>> Message-ID: <51464.82.67.159.21.1134940464.squirrel@mis....>
>>> Content-Type: text/plain;charset=iso-8859-1
>>>
>>> Hello,
>>>
>>> I am using xlf95 to compile my program. When I launch the program, it
>>> works ! Now, if I monitor the memory usage it is strange. I have a
>>> real
>>> memory of about 200 MB while virtual memory is about 800 MB. Does
>>> anyone
>>> know what is that virtual memory and if i can control it with special
>>> option.
>>
>
>
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