[Pw_forum] IS DUAL CORE 2.7 GHz, 2GB RAM SUFFICIENT FOR QE calculations??

[siddheshwar chopra]

Dear Ashkan,
I don't know if I am correct, but you could try reducing the number of
cores. This way I guess you will have more RAM to be used per core.

Regards,


On Wed, Jul 23, 2014 at 10:47 AM, ashkan shekaari <shekaari at gmail.com>
wrote:

> dear siddheshwar
>
> i ran a supercell system made of 48 atoms on a computer server with
> 120 cores and 6 GB of RAM , but it didn't work . my calculations
> failed , it needs more than 6 GB of RAM .
>
> On 7/23/14, siddheshwar chopra <sidhusai at gmail.com> wrote:
> > Dear Ashkan,
> > How much large RAM do you mean? Is it 4GB in total or more? I can add
> > another 2GB hence.
> >
> > Regards,
> >
> >
> > On Wed, Jul 23, 2014 at 6:50 AM, ashkan shekaari <shekaari at gmail.com>
> > wrote:
> >
> >> yes , but you can not run any supercell calculations or defected systems
> >> .
> >>
> >> for these calculations you should have a large amount of memory (RAM) .
> >>
> >> On 7/22/14, siddheshwar chopra <sidhusai at gmail.com> wrote:
> >> > Dear Users,
> >> > I am new to QE and really need an estimate about the computational
> >> > resources needed to run magnetic, phonon, optical and band structure
> >> > calculations for light, medium and heavy atoms of around 60 atoms
> >> > supercell. I currently have a dual core 2.7 GHz processor with 2GB
> RAM,
> >> > HDD=250GB. Please suggest me so that I can run calculations without
> any
> >> > memory of processor issues.
> >> > I have Windows XP and also Linux mint installed on the same machine. I
> >> have
> >> > also increased the virtual memory per partition.
> >> > I also now how to make an external USB drive work as system RAM. Will
> >> that
> >> > help me?
> >> >
> >> > Kind Regards,
> >> >
> >> > --
> >> > *Dr. Siddheshwar chopra,*
> >> >
> >> >
> >> > *M.Sc., Ph.D (Physics)Assistant Professor (Physics),*
> >> > *Amity University, Noida, India.*
> >> >
> >>
> >>
> >> --
> >> Best wishes
> >> Ashkan Shekaari
> >> _______________________________________________
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> >> http://pwscf.org/mailman/listinfo/pw_forum
> >>
> >
> >
> >
> > --
> > *Dr. Siddheshwar chopra,*
> >
> >
> > *M.Sc., Ph.D (Physics)Assistant Professor (Physics),*
> > *Amity University, Noida, India.*
> >
>
>
> --
> Best wishes
> Ashkan Shekaari
> _______________________________________________
> Pw_forum mailing list
> Pw_forum at pwscf.org
> http://pwscf.org/mailman/listinfo/pw_forum
>



-- 
*Dr. Siddheshwar chopra,*


*M.Sc., Ph.D (Physics)Assistant Professor (Physics),*
*Amity University, Noida, India.*
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