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 <[email protected]> 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 > _______________________________________________ > Wien mailing list > [email protected] > > https://urldefense.proofpoint.com/v2/url?u=http-3A__zeus.theochem.tuwien.ac.at_mailman_listinfo_wien&d=DwICAg&c=yHlS04HhBraes5BQ9ueu5zKhE7rtNXt_d012z2PA6ws&r=U_T4PL6jwANfAy4rnxTj8IUxm818jnvqKFdqWLwmqg0&m=woK5GmXj7EmuNvmeBZLERexqEYJ1Gxy7yjF4sV2H1IA&s=oN_y0PMTBGFDfTY5zWM_ytb0zN4xIIl55vcWkefWV-0&e= > SEARCH the MAILING-LIST at: > https://urldefense.proofpoint.com/v2/url?u=http-3A__www.mail-2Darchive.com_wien-40zeus.theochem.tuwien.ac.at_index.html&d=DwICAg&c=yHlS04HhBraes5BQ9ueu5zKhE7rtNXt_d012z2PA6ws&r=U_T4PL6jwANfAy4rnxTj8IUxm818jnvqKFdqWLwmqg0&m=woK5GmXj7EmuNvmeBZLERexqEYJ1Gxy7yjF4sV2H1IA&s=alo9IkAiLLoUEnci7rmpmEVQUQzGDBtDYqmIufVhB2g&e= > -- 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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