[ADMB Users] memory units

[Mollie Brooks]

Hello,
I'm still having trouble allocating memory.
You said "any value greater than 2^31 for any of these inputs will be  
truncated, rounded, or otherwise produce unpredictable results"
So how do I allocate more than 2GB?

In my TOP_OF_MAIN_SECTION I have
	arrmblsize = 40000000000;
Of course this gets truncated or rounded down.
The program stops and I get this in my output file:
	1345314216>=1345294336
	 No memory for dvar_vectors
  	Need to increase ARRAY_MEMBLOCK_SIZE parameter
	In gradient_structure declaration

thanks,
Mollie


On Sep 10, 2010, at 3:47 PM, Ian Taylor wrote:

> Hi Mollie,
> This topic seems to be frequently asked about, so I'll add something  
> about it to the ADMB FAQ: http://admb-project.org/documentation/faq
> This values should be in Bytes, so your arrmblsize = 800000000000  
> Bytes = 800000000000/(1024^2) = 762939.5 MB = 800000000000/(1024^3)  
> = 745 GB, which is surely more memory than your cluster has available.
>
> However, depending on the compiler, any value greater than 2^31 for  
> any of these inputs will be truncated, rounded, or otherwise produce  
> unpredictable results. Allan Hicks and I did some work on this topic  
> which is available at http://admb-project.org/community/benchmarks/compilers
>
> You can search the users list archives at: http://groups.google.com/group/admb-users/
> -Ian
>
> On 9/10/2010 12:11 PM, Mollie Brooks wrote:
>>
>> Hi all,
>> I'm not very good at understanding hardware.
>> I'm running ADMB on a cluster and have to specify how much memory  
>> to allocate.
>> If my ADMB code has the lines
>>  arrmblsize = 800000000000;
>>  gradient_structure::set_GRADSTACK_BUFFER_SIZE(1.e7);
>>  gradient_structure::set_CMPDIF_BUFFER_SIZE(1.e7);
>>  gradient_structure::set_MAX_NVAR_OFFSET(5000);
>>  gradient_structure::set_NUM_DEPENDENT_VARIABLES(5000);
>>
>> How do I translate this into Megabytes?
>> thanks,
>> Mollie
>>
>> Mollie Brooks
>> Ph.D. Candidate
>> NSF IGERT Fellow
>> Biology Department
>> University of Florida
>> mbrooks at ufl.edu
>> www.zoology.ufl.edu/mbrooks
>>
>>
>>
>>
>> _______________________________________________
>> Users mailing list
>> Users at admb-project.org
>> http://lists.admb-project.org/mailman/listinfo/users

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