[QE-users] large memory consumption of ph.x (QE 6.2.1)

[Christoph Wolf]

Dear all,

is it possible that ph.x requires almost 10 times as much memory as a
single scf run?

I run a job on 5 nodes and 120 cores with a total allocated RAM of 600 GB
in and the scf run tells me that

Estimated total dynamical RAM >       7.92 GB

However the phonon run exceeds the available memory during "electric fields
calculation". I read that due to differences in parallelization ph.x
requires more RAM than pw.x but a factor of almost 10 seems very high?

node configuration is 2 12-core Intel Xeon E5-2680 v3 at 2.50GHz (24 in
total) and 120GB of usable RAM.

Thanks in advance for your help and have a nice Sunday everyone!

Chris



-- 
Postdoctoral Researcher
Center for Quantum Nanoscience, Institute for Basic Science
Ewha Womans University, Seoul, South Korea
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