[Carpet] memory allocation in global loop-local mode?

[Erik Schnetter]

On Aug 24, 2006, at 06:26:31, Bela Szilagyi wrote:

> my_var is a gridfunction.  Given that I don't know the meaning of  
> "global
> loop-local" I can't tell whether this implies (according to your  
> reply) if
> memory should be there or not.
>
> My current work-around is a static storage request.  Is this the  
> best one can
> do?
>
> Bela.
>
> On Wednesday 23 August 2006 21:21, Erik Schnetter wrote:
>> On Aug 23, 2006, at 13:59:13, Bela Szilagyi wrote:
>>> In one of my thorns (taken after AHFinderDirect's mask-setter
>>> routine schedule
>>> bing) I had
>>>
>>>
>>> schedule my_routine in my_group
>>>         {
>>>         lang: C
>>>        storage: my_var
>>>         options: global loop-local
>>>         } "..."
>>>
>>>
>>> while the parfile says
>>>
>>> Carpet::enable_all_storage = no
>>>
>>> The routine ended up being called, at least once within the first
>>> course
>>> time-step worth of time, with my_var being set to NULL.
>>>
>>> A bit of peaking into it with gdb has shown that not all calls to
>>> the routine
>>> were lacking the memory, but, in the one case this variable would
>>> have been
>>> used, the memory was not there.
>>>
>>> Is this a bug or a feature? In other terms -- does "global loop-
>>> local" imply
>>> that one should not assume memory associated with tmp_var ?
>>
>> That depends on what my_var is.  If it is a grid function, then in
>> local mode, memory should always be there, otherwise not.  If it is a
>> grid arrays or grid scalar, then memory should always be there.

global loop-local means that the routine is called in local mode.   
That means that storage should be there.

-erik

-- 
Erik Schnetter <schnetter at cct.lsu.edu>

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