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["D. R. Hamann" <drhamann@mat-simresearch.com>]

Perhaps whoever can answer this can also address the question of why in 
5.3.3/tests/paral/Refs,

grep 'dielectric constant =' tN*.out gives:

tN0.out: dielectric constant =  27.4114
tN10.out: dielectric constant =  27.3806
tN1.out: dielectric constant =  27.4114
tN2.out: dielectric constant =  27.3804
tN4.out: dielectric constant =  27.3805

is considered OK?  These are band-parallelism GW tests, and it looks to 
me as if serial (tN0 and tN1) and parallel tests give unacceptably 
different answers.

Don Hamann

Philippe Blaise wrote:
> Please, someone could explain more in details what is written in the 
> release notes for the 5.3 ?
>
> B.6 *Parallelism over bands is available for GW*. See the input 
> variable gwpara.
>    This parallelism allows for memory savings, and is quite efficient.
>    At present, either the band parallelism or the k point parallelism 
> is available
>    in GW, they cannot be used simultaneously.
>    This has been implemented by R. Shaltaf.
>    (Note, however, that parallelism over bands in GW is not compatible 
> with nsppol=2 as of v5.3.0)
>    Automatic test for band parallelism : paral#N
>
> and the corresponding action of the parameter gwpara=2 : 
> parallelisation on bands.
>
> I'm not sure to understand : "bands" stand for matrix elements ? 
> wavefunctions ?
>
> Thanks a lot,
>
> Philippe

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D. R. Hamann
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