<div dir="ltr"><div class="gmail_default" style="font-family:verdana,sans-serif;color:#000000">I expect it was the Ubuntu update.</div><div class="gmail_default" style="font-family:verdana,sans-serif;color:#000000"><br></div><div class="gmail_default" style="font-family:verdana,sans-serif;color:#000000">The synchronous CPU will be some combination of:</div><div class="gmail_default" style="font-family:verdana,sans-serif;color:#000000">a) Multiple cores running lapack commands</div><div class="gmail_default" style="font-family:verdana,sans-serif;color:#000000">b) Openmp code in some subroutines (if you are not using mpi)</div><div class="gmail_default" style="font-family:verdana,sans-serif;color:#000000">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.</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Thu, Jul 25, 2019 at 12:25 PM Luc Fruchter <<a href="mailto:luc.fruchter@u-psud.fr">luc.fruchter@u-psud.fr</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">I changed to Wien2k 19.1 version, latest Intel ifort compiler (2019.4) <br>
and latest Ubuntu (18.04.2), shared memory, 4 CPUs, same case with 154 <br>
atoms :<br>
<br>
- no more anomalous reading of the disk from parallel lapw2c<br>
<br>
- the system is however slowed down a lot (as seen from switching <br>
between applications), although there is very little use of the CPUs. <br>
The usage of the Cpus looks strange, compared to lpaw1c : quasi idle <br>
state, interrupted by burst of synchronous CPU use for a few seconds <br>
(why are lpaw2c synchronous: exchange data ?).<br>
<br>
- no log warnings<br>
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</blockquote></div><br clear="all"><div><br></div>-- <br><div dir="ltr" class="gmail_signature"><div dir="ltr">Professor Laurence Marks<br>Department of Materials Science and Engineering<br>Northwestern University<br><a href="http://www.numis.northwestern.edu/" target="_blank">www.numis.northwestern.edu</a><div>Corrosion in 4D: <a href="http://www.numis.northwestern.edu/MURI" target="_blank">www.numis.northwestern.edu/MURI</a><br>Co-Editor, Acta Cryst A<br>"Research is to see what everybody else has seen, and to think what nobody else has thought"<br>Albert Szent-Gyorgi</div></div></div>