Re: [Starpu-devel] Temporary buffer initialization

[Xavier Lacoste <xavier.lacoste@inria.fr>]

Le 17 avr. 2014 à 15:53, Samuel Thibault <samuel.thibault@ens-lyon.org> a 
écrit :

> Hello,
> 
> Xavier Lacoste, le Thu 17 Apr 2014 14:12:45 +0200, a écrit :
>> Le 17 avr. 2014 à 11:51, Samuel Thibault <samuel.thibault@ens-lyon.org> a 
>> écrit :
>>> Xavier Lacoste, le Wed 16 Apr 2014 14:59:10 +0200, a écrit :
>>>> I want to have a temporary buffer, allocated by starpu, and initialized 
>>>> (to
>>>> zero).
>>>> Some task will add values in it afterward and then it will be send to an 
>>>> other
>>>> process for a remote task.
>>>> These local tasks can be executed in any order.
>>> 
>>> Well, this looks like a reduction, won't STARPU_REDUX work for you?
>> 
>> Yes it's a reduction but where only part of the datum is touch in each 
>> task. So i didn't want all CPUs to perform an addition on the whole buffer 
>> when I know which part will be touch. And I don't want a buffer to be 
>> allocated per worker.
> 
> Ok.  I have added the support to the 1.1 branch and trunk, it is now a
> matter of using starpu_data_set_reduction_methods to provide with the
> init codelet, and then you'll be allowed to use RW on an uninitialized
> data, just liked you'd be in REDUX mode.
Thanks a lot, i'll try that !

XL.
> 
> Samuel