Thanks a lot Dr. Stefano for your reply.
On Fri, Dec 24, 2010 at 3:50 PM, Stefano de Gironcoli wrote:
> It strongly depends on the particular calculation and on the
> parallelization strategy you choose. Linear scaling would be the ideal
> scaling which you never get.
> The things to keep in
Dear QE users,
I am trying to see how the runtime scales with
number of processors. I did the same calculation using one node with eight
processors on one cluster and 8 nodes with total 56 processors on other
cluster but the time does not seem to scale linearly with the
On Dec 24, 2010, at 10:42 , mohnish pandey wrote:
> Can anybody give me an idea how does the time scale with number of
> processors.
please see the user guide in particular chapter 3:
http://www.quantum-espresso.org/user_guide/node15.html
and this, in particular the "(Too) Frequently Asked
It strongly depends on the particular calculation and on the
parallelization strategy you choose. Linear scaling would be the ideal
scaling which you never get.
The things to keep in mind are load balancing and communication
overhead. This last is affected by your communication network
