[QE-users] [neb.x] How to lessen I/O?

[Paolo Giannozzi]

Yes, a fast file system. NFS via Ethernet may still be usable as long as
you do not have heavy or frequent I/O. Writing via NFS is especially slow.

For your information: https://gitlab.com/QEF/q-e/-/issues/299

Paolo

On Mon, Mar 22, 2021 at 10:15 AM Takahiro Chiba <
takahiro_chiba at eis.hokudai.ac.jp> wrote:

> Dear Dr. Giannozzi,
>
> By the expression "parallel file system", you meant fast file systems
> such as LUSTRE, not NFS via ethernet, right?
>
> ---Sender---
> Takahiro Chiba
> Undergraduate at Hokkaido University
> Expected graduation date: Mar. 2021
> Expected to be a graduate student at HU from Apr. 2021
> takahiro_chiba at eis.hokudai.ac.jp
> -----
>
> 2021年3月19日(金) 6:14 Paolo Giannozzi <p.giannozzi at gmail.com>:
> >
> > On Thu, Mar 18, 2021 at 6:59 PM Paolo Giannozzi <p.giannozzi at gmail.com>
> wrote:
> >
> >> The "wfcdir"" option is  no longer implemented, if I remember correctly.
> >
> >
> > I didn't remember correctly: it is still implemented. As I mentioned
> earlier, though, it is expected to work only for a subset of all possible
> use cases. In particular, it should work for the self-consistent code, but
> I don't know whether it has ever been tested in NEB.
> >
> > Paolo
> >
> >
> >> It was adding unneeded complexity to an already  (too) complex I/O
> code, it did not work for many use cases, it was useful only for the rather
> peculiar case of a parallel machine with no parallel file system.
> Unfortunately the documentation was not updated to reflect its demise.
> >>
> >> Paolo
> >> --
> >> Paolo Giannozzi, Dip. Scienze Matematiche Informatiche e Fisiche,
> >> Univ. Udine, via delle Scienze 206, 33100 Udine, Italy
> >> Phone +39-0432-558216, fax +39-0432-558222
> >>
> >
> >
> > --
> > Paolo Giannozzi, Dip. Scienze Matematiche Informatiche e Fisiche,
> > Univ. Udine, via delle Scienze 206, 33100 Udine, Italy
> > Phone +39-0432-558216, fax +39-0432-558222
> >
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-- 
Paolo Giannozzi, Dip. Scienze Matematiche Informatiche e Fisiche,
Univ. Udine, via delle Scienze 206, 33100 Udine, Italy
Phone +39-0432-558216, fax +39-0432-558222
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