[Developers] Steering checkpointing by wall time

[Allen Gabrielle]

In that case, I think you are asking the parameter to do two different  
things, and then should instead have two different parameters.

On May 7, 2008, at 3:42 PM, Erik Schnetter wrote:

> 0 is not a legal value.  We could make it legal, and then it would  
> mean to checkpoint as often as possible.
>
> I prefer -1 for this out-of-band value, since it is immediately  
> clear that -1 does something special.  It is not as clear that 0 has  
> a special meaning.
>
> On another note, using minutes as unit becomes impractical if the  
> time span becomes of the order of days.  People don't know offhand  
> how many minutes there are in a day.
>
> -erik
>
> On May 7, 2008, at 15:32:06, Allen Gabrielle wrote:
>
>> What happens if you checkpoint every 0 hours? (That is, can we remove
>> the -1 option
>> to disable checkpointing if choosing 0 does this).
>>
>> On May 7, 2008, at 2:38 PM, Ian Hinder wrote:
>>
>>> Erik Schnetter wrote:
>>>> I suggest to add a new parameter to CactusBase/IOUtil which
>>>> checkpoints every so many wall clock hours.  This is often more
>>>> convenient than choosing the checkpointing interval by iterations.
>>>
>>> This is a good idea.  Should it be hours, or minutes or seconds?  I
>>> think the termination condition is done in minutes, which seems
>>> reasonable to me.
>>>
>>>
>>>>
>>>> -erik
>>>>
>>>> Index: param.ccl
>>>> ===================================================================
>>>> RCS file: /cactusdevcvs/CactusBase/IOUtil/param.ccl,v
>>>> retrieving revision 1.51
>>>> diff -u -r1.51 param.ccl
>>>> --- param.ccl	18 Apr 2007 16:00:12 -0000	1.51
>>>> +++ param.ccl	7 May 2008 18:50:15 -0000
>>>> @@ -142,6 +143,11 @@
>>>> 1:* :: "Every so many iterations"
>>>> -1:0 :: "Disable periodic checkpointing"
>>>> } -1
>>>> +REAL checkpoint_every_walltime_hours "How often to checkpoint"
>>>> STEERABLE = ALWAYS
>>>> +{
>>>> +  (0:* :: "After so much walltime has passed"
>>>> +  -1   :: "Disable periodic walltime checkpointing"
>>>> +} -1
>>>> BOOLEAN checkpoint_on_terminate "Checkpoint after last iteration"
>>>> STEERABLE = ALWAYS
>>>> {
>>>> } "no"
>>>>
>>>
>>>
>>> -- 
>>> Ian Hinder
>>> hinder at gravity.psu.edu
>>> http://www.gravity.psu.edu/~hinder
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>>> Developers mailing list
>>> Developers at cactuscode.org
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>>>
>>
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>
>
> -- 
> Erik Schnetter <schnetter at cct.lsu.edu>   http://www.cct.lsu.edu/~eschnett/
>
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