Dear Lorenzo, yes what you suggested is correct. Only one point I need to clarify here. The power consumption per R-Pi board is 4 watts. Regarding network switch, yes we need one. But overall what you said is right. It is better to buy a desktop than building R-Pi cluster. I am planning for a refurbished or used one IBM server with Intel Xeon either quad core or 2 quad cores and 8 GB RAM. How much HDD would be good?
Regards, On Wed, Jul 23, 2014 at 1:38 PM, Lorenzo Paulatto < lorenzo.paulatto at impmc.upmc.fr> wrote: > > On 07/23/2014 08:55 AM, siddheshwar chopra wrote: > > 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? > > I would recommend to use the same money to buy a powerful desktop > machine instead. The ARM1176 cpu used in the Raspberry Pi is not > particularly suited for floating-point arithmetic (even if it does > include hardware floating point). You also have to factor in the slow > network hardware, and the maintenance nightmare that it would be to keep > such a cluster running. > > Buying 10 RPi would cost ~ 230?, to which you have to add 10 USB power > and micro usb cables and the network cables and some kind of network > switch. I would say around 350? for 20 extremely slow cores. With the > same money you can probably grab special offer desktop from Dell with > only 4 cores, but each 4 times faster. > > cheers > > > -- > Dr. Lorenzo Paulatto > IdR @ IMPMC -- CNRS & Universit? Paris 6 > +33 (0)1 44 275 084 / skype: paulatz > http://www.impmc.upmc.fr/~paulatto/ > 23-24/4?16 Bo?te courrier 115, 4 place Jussieu 75252 Paris C?dex 05 > > _______________________________________________ > 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.* -------------- next part -------------- An HTML attachment was scrubbed... URL: http://pwscf.org/pipermail/pw_forum/attachments/20140723/ad46c5d4/attachment.html
