Charm++ parallel programming system

[Gengbin Zheng <zhenggb AT gmail.com>]

It is possible to change some of the readonly variables. You just need
to write your code in the migration constructor to update the
readonly, and the values will be broadcast to all other processors.

Another alternative is to change the pup function of your readonly
variables (assuming non-basics types) to change the value when
unpacking.

Gengbin

On Mon, Oct 17, 2011 at 9:38 PM, Evghenii Gaburov
<e-gaburov AT northwestern.edu>
 wrote:
> Hi,
>
> Thanks for prompt reply!
>
>>   Now, can you describe the scenario in which you need this feature?
>> Maybe, we can find an alternative solution to your problem.
> It is not a deal breaker of course, more like a convenience feature.
>
> One simple example is to pass a parameter that informs the program only to 
> extract data from the checkpoint file and write it to disk in an other 
> format for further analysis (e.g. in case of a crash) instead of restart 
> computations. Or to change, say, time-step estimate in case of a hydrocode 
> (CFL number which is a just a floating point number < 1 global for all 
> code).
>
> I am sure one may come up with other examples showing that having a means 
> to change few parameter during restart will be nice feature to have.
>
> Cheers,
>  Evghenii
>
>
>>
>> On Mon, Oct 17, 2011 at 8:16 PM, Evghenii Gaburov
>> <e-gaburov AT northwestern.edu>
>>  wrote:
>>> Hi All,
>>>
>>> I am experimenting with checkpoints in Charm++, and was wondering whether 
>>> there
>>> is a way to pass some extra parameters to the program upon restart? For 
>>> example
>>> to change several of the (non-readonly)  variables that are used during 
>>> runtime.
>>>
>>> If there is a way, are the some examples on how to implement it?
>>>
>>> Thanks!
>>>
>>> Cheers,
>>>  Evghenii
>>>
>>>
>>> --
>>> Evghenii Gaburov, 
>>> e-gaburov AT northwestern.edu
>>>
>>>
>>>
>>>
>>>
>>>
>>>
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>>
>>
>>
>> --
>> Esteban Meneses
>> PhD Student
>> Parallel Programming Laboratory
>> Department of Computer Science
>> University of Illinois at Urbana-Champaign
>
> --
> Evghenii Gaburov, 
> e-gaburov AT northwestern.edu
>
>
>
>
>
>
>
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