<div dir="ltr"><div><div><div>Dear Ashkan,<br></div>Thats really sad news for me. :( I was planning to build a raspberry pi cluster (with 512MB RAM on each board) for QE. But now it seems I might waste my money making it. <br>
</div>Ashkan how about studying molecules with QE? As far as I read, we use 1x1x1 k-point (Gamma) only for studying them. Please give your comments on molecule study. Say I need to study magnetic, optical and DOS of molecules. Then is my system sufficient?<br>
<br></div>Regards,<br></div><div class="gmail_extra"><br><br><div class="gmail_quote">On Wed, Jul 23, 2014 at 11:39 AM, ashkan shekaari <span dir="ltr"><<a href="mailto:shekaari@gmail.com" target="_blank">shekaari@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">dear Siddheshwar<br>
i ran with 1,2, 8, 32, 48, 120 cores , but all had the same failed result.<br>
<div class="HOEnZb"><div class="h5"><br>
On 7/23/14, siddheshwar chopra <<a href="mailto:sidhusai@gmail.com">sidhusai@gmail.com</a>> wrote:<br>
> Dear Ashkan,<br>
> I don't know if I am correct, but you could try reducing the number of<br>
> cores. This way I guess you will have more RAM to be used per core.<br>
><br>
> Regards,<br>
><br>
><br>
> On Wed, Jul 23, 2014 at 10:47 AM, ashkan shekaari <<a href="mailto:shekaari@gmail.com">shekaari@gmail.com</a>><br>
> wrote:<br>
><br>
>> dear siddheshwar<br>
>><br>
>> i ran a supercell system made of 48 atoms on a computer server with<br>
>> 120 cores and 6 GB of RAM , but it didn't work . my calculations<br>
>> failed , it needs more than 6 GB of RAM .<br>
>><br>
>> On 7/23/14, siddheshwar chopra <<a href="mailto:sidhusai@gmail.com">sidhusai@gmail.com</a>> wrote:<br>
>> > Dear Ashkan,<br>
>> > How much large RAM do you mean? Is it 4GB in total or more? I can add<br>
>> > another 2GB hence.<br>
>> ><br>
>> > Regards,<br>
>> ><br>
>> ><br>
>> > On Wed, Jul 23, 2014 at 6:50 AM, ashkan shekaari <<a href="mailto:shekaari@gmail.com">shekaari@gmail.com</a>><br>
>> > wrote:<br>
>> ><br>
>> >> yes , but you can not run any supercell calculations or defected<br>
>> >> systems<br>
>> >> .<br>
>> >><br>
>> >> for these calculations you should have a large amount of memory (RAM)<br>
>> >> .<br>
>> >><br>
>> >> On 7/22/14, siddheshwar chopra <<a href="mailto:sidhusai@gmail.com">sidhusai@gmail.com</a>> wrote:<br>
>> >> > Dear Users,<br>
>> >> > I am new to QE and really need an estimate about the computational<br>
>> >> > resources needed to run magnetic, phonon, optical and band structure<br>
>> >> > calculations for light, medium and heavy atoms of around 60 atoms<br>
>> >> > supercell. I currently have a dual core 2.7 GHz processor with 2GB<br>
>> RAM,<br>
>> >> > HDD=250GB. Please suggest me so that I can run calculations without<br>
>> any<br>
>> >> > memory of processor issues.<br>
>> >> > I have Windows XP and also Linux mint installed on the same machine.<br>
>> >> > I<br>
>> >> have<br>
>> >> > also increased the virtual memory per partition.<br>
>> >> > I also now how to make an external USB drive work as system RAM.<br>
>> >> > Will<br>
>> >> that<br>
>> >> > help me?<br>
>> >> ><br>
>> >> > Kind Regards,<br>
>> >> ><br>
>> >> > --<br>
>> >> > *Dr. Siddheshwar chopra,*<br>
>> >> ><br>
>> >> ><br>
>> >> > *M.Sc., Ph.D (Physics)Assistant Professor (Physics),*<br>
>> >> > *Amity University, Noida, India.*<br>
>> >> ><br>
>> >><br>
>> >><br>
>> >> --<br>
>> >> Best wishes<br>
>> >> Ashkan Shekaari<br>
>> >> _______________________________________________<br>
>> >> Pw_forum mailing list<br>
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>> >> <a href="http://pwscf.org/mailman/listinfo/pw_forum" target="_blank">http://pwscf.org/mailman/listinfo/pw_forum</a><br>
>> >><br>
>> ><br>
>> ><br>
>> ><br>
>> > --<br>
>> > *Dr. Siddheshwar chopra,*<br>
>> ><br>
>> ><br>
>> > *M.Sc., Ph.D (Physics)Assistant Professor (Physics),*<br>
>> > *Amity University, Noida, India.*<br>
>> ><br>
>><br>
>><br>
>> --<br>
>> Best wishes<br>
>> Ashkan Shekaari<br>
>> _______________________________________________<br>
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>><br>
><br>
><br>
><br>
> --<br>
> *Dr. Siddheshwar chopra,*<br>
><br>
><br>
> *M.Sc., Ph.D (Physics)Assistant Professor (Physics),*<br>
> *Amity University, Noida, India.*<br>
><br>
<br>
<br>
--<br>
Best wishes<br>
Ashkan Shekaari<br>
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</div></div></blockquote></div><br><br clear="all"><br>-- <br><div dir="ltr"><div dir="ltr"><span style="color:rgb(204,0,0)"><span style="color:rgb(153,0,255)"><b>Dr. Siddheshwar chopra,</b></span><br></span><span style="color:rgb(116,27,71)"><i>M.Sc., Ph.D (Physics)<br>
Assistant Professor (Physics),<br></i></span></div><span style="color:rgb(116,27,71)"><i>Amity University, Noida, India.</i></span><span style="color:rgb(116,27,71)"><i><br></i></span><br></div>
</div>