[Wien] lapw2c tries to read an anomalous amount of data

[Laurence Marks]

I expect it was the Ubuntu update.

The synchronous CPU will be some combination of:
a) Multiple cores running lapack commands
b) Openmp code in some subroutines (if you are not using mpi)
c) Data communications and/or cores waiting for others if you are using
mpi. When they are all in step there will be an apparent burst.

On Thu, Jul 25, 2019 at 12:25 PM Luc Fruchter <luc.fruchter at u-psud.fr>
wrote:

> I changed to Wien2k 19.1 version, latest Intel ifort compiler (2019.4)
> and latest Ubuntu (18.04.2), shared memory, 4 CPUs, same case with 154
> atoms :
>
> - no more anomalous reading of the disk from parallel lapw2c
>
> - the system is however slowed down a lot (as seen from switching
> between applications), although there is very little use of the CPUs.
> The usage of the Cpus looks strange, compared to lpaw1c : quasi idle
> state, interrupted by burst of synchronous CPU use for a few seconds
> (why are lpaw2c synchronous: exchange data ?).
>
> - no log warnings
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-- 
Professor Laurence Marks
Department of Materials Science and Engineering
Northwestern University
www.numis.northwestern.edu
Corrosion in 4D: www.numis.northwestern.edu/MURI
Co-Editor, Acta Cryst A
"Research is to see what everybody else has seen, and to think what nobody
else has thought"
Albert Szent-Gyorgi
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