You did not tell us the full error statement, because I would hope that it also gives the subroutine and a line number, where the crash happens.

Anyway, please try the following:

SRC_mixer/qmix9.f

!       Note to LDM: restore the errors here, on rare occaisions this can crash
open(33,file=fname2,status='old',form='unformatted',ACTION='READ',err=6003)

In this  open statement, remove the  "ACTION='READ' argument.

We have some problems in opening non-exisitng unformatted files in READ-only mode with some ifort versions.



Am 06.12.2022 um 16:12 schrieb Karel Vyborny:
Right, my apologies.

Just 1000 k-points, RKMAX=7, GMAX=12, and PBE functional. This was a very basic setup and I got puzzled that what used to work before suddenly runs into troubles (with newer version). The kind of error

forrtl: severe (39): error during read, unit 33, file ..../FeRh.broyd2001

did not seem to me like having much to do with input parameters. Did you mean Check-mixing?

:DIS  :  CHARGE DISTANCE       ( 1.3576701 for atom    2 spin 1) 2.8250267
:PLANE:  PW TOTAL      7.3740 DISTAN   4.45E+00 %  6.03E+01
:CHARG:  CLM/ATOM    212.0724 DISTAN   7.62E-01 %  3.59E-01
:MIX  :   PRATT  REGULARIZATION:  2.00E-04 GREED: 0.01018
:ENE  : *WARNING** TOTAL ENERGY IN Ry =       -24232.61180558

Is there anything else I can look for? Thanks,

Karel




On Tue, 6 Dec 2022, Laurence Marks wrote:

You have not provided enough information for me or anyone else to even start to guess. Please follow the  "Nettiquette" with much more information. For
instance RKMAX, K-pts, functional, gmax, oversampling, output of
check_lapw...

---
Professor Laurence Marks
Department of Materials Science and Engineering
Northwestern University
www.numis.northwestern.edu
"Research is to see what everybody else has seen, and to think what nobody
else has thought" Albert Szent-Györgyi

On Tue, Dec 6, 2022, 20:12 Karel Vyborny <vybor...@fzu.cz> wrote:
      Dear Wien2k users,
      the following problem occurs only for version 21.1 while the SCF
      cycle
      converges in 16 steps using version 14.2; I'm trying to converge
      the total
      energy of FeRh in antiferromagnetic phase (so as to compare it
      to the
      ferromagnetic one later) and I'm using the attached .struct and
      .inst
      files. The first cycle runs without any trouble, and at the end
      of the
      second one, mixer complains "error during read, unit 33" which
      is the
      .broyd2001 file. The file mixer.error says... well, "Error in
      MIXER". The
      same happens if I take the converged density from version 14 and
      try to
      continue converging (say with stricter criteria) in the new
      version.
        I know that between versions 14 and 21 (or today), mixer was
      substantially improved but was not able to figure out what was
      going
      wrong now. Other systems run just fine on my installation and
      any advice
      would be appreciated!

      Best regards,

      KV


      --- x ---
      dr. Karel Vyborny
      Fyzikalni ustav AV CR, v.v.i.
      Cukrovarnicka 10
      Praha 6, CZ-16253
      tel: +420220318459

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