[Q-e-developers] global_kpoint_index

[Lorenzo Paulatto]

Nevermind,
we have one now..

By the way, I'm trying to do a broadcast from one pool to all the others; i.e. 
assuming the only a certain pool, not necessarily rthe first one, has the 
correct data and I want everyone to have a copy of it. 

I'm finding this annoyingly difficult, I'm a bit lost with which are the correct 
communicators to use. I would like to avoid doing a huge mp_sum, is there any 
place where it has been implemented already?

This would also be used in the EXX code: at the moment each pool rotates the 
wavefcuntions for the points it has, then a massive all-to-all mp_sum is 
called to broadcast the data, this looks like a massive bottleneck to me 
(maybe it is not?), I'm only one step away from fixing it, but I need the 
above..



On Tuesday, October 18, 2016 10:16:36 AM CEST you wrote:
> Hello,
> do you know if we have already a function that does the inverse of
> global_kpoint_index(ik,nkstot)
> 
> i.e. that gives you the pool-local number of the k-point, give the global
> number?
> 
> cheers


-- 
Dr. Lorenzo Paulatto 
IdR @ IMPMC -- CNRS & Université Paris 6
phone: +33 (0)1 44275 084 / skype: paulatz
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