Re: [Starpu-devel] Temporary buffer initialization

[Samuel Thibault <samuel.thibault@ens-lyon.org>]

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.

Samuel