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<p>Dear Alpin,</p>
<p>pw.x can run without writing the wavefunctions to disk, but ph.x
does not have this capability. However, if you think that your RAM
space is sufficient, you can just set outdir to a directory inside
/dev/shm, which in 99% of modern linux systems is a RAM disk and
is user-writeable.<br>
</p>
<p>kind regards<br>
</p>
<div class="moz-cite-prefix">On 03/12/2023 08:14, alpin novianus via
users wrote:<br>
</div>
<blockquote type="cite"
cite="mid:1359320855.6627343.1701587685187@mail.yahoo.com">
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style="font-family:Helvetica Neue, Helvetica, Arial, sans-serif;font-size:13px;">
<div dir="ltr" data-setdir="false">Dear QE experts,</div>
<div dir="ltr" data-setdir="false"><br>
</div>
<div dir="ltr" data-setdir="false">I had my calculations stopped
because my disk space is not enough to store the wavefunctions
written by QE (ph.x) after the calculation is finished.</div>
<div dir="ltr" data-setdir="false">I am doing electron-phonon =
'lambda_tetra' calculation.</div>
<div dir="ltr" data-setdir="false"><br>
</div>
<div dir="ltr" data-setdir="false">
<div>
<div>%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%</div>
<div> Error in routine davcio (10):</div>
<div> error writing file
"..../_ph0/pwscf.q_9/pwscf.wfc501"</div>
</div>
<div>
<div
style="color: rgb(0, 0, 0); font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;">%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%</div>
</div>
<div
style="color: rgb(0, 0, 0); font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;"><br>
</div>
<div
style="color: rgb(0, 0, 0); font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;"
dir="ltr" data-setdir="false">Looking at this error, I
realize that in QE, the wavefunction is always written to
the disk after the calculation.</div>
<div
style="color: rgb(0, 0, 0); font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;"
dir="ltr" data-setdir="false"><br>
</div>
<div
style="color: rgb(0, 0, 0); font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;"
dir="ltr" data-setdir="false">I am also a VASP user, and in
VASP there is an input tag to not write the wavefunction
(LWAVE).</div>
<div
style="color: rgb(0, 0, 0); font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;"
dir="ltr" data-setdir="false">Is there a similar method to
do this in quantum espresso (ph.x)?</div>
<div
style="color: rgb(0, 0, 0); font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;"
dir="ltr" data-setdir="false"><br>
</div>
<div
style="color: rgb(0, 0, 0); font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;"
dir="ltr" data-setdir="false">It doesn't seem that the
wavefunction files will be needed for the post-processing
(?), so I wonder if they don't need to be written actually.<br>
</div>
<div
style="color: rgb(0, 0, 0); font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;"
dir="ltr" data-setdir="false">But I may be completely wrong.
Please correct me if so.</div>
<div
style="color: rgb(0, 0, 0); font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;"
dir="ltr" data-setdir="false"><br>
</div>
<div
style="color: rgb(0, 0, 0); font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;"
dir="ltr" data-setdir="false">Thank you for your advice,</div>
<div
style="color: rgb(0, 0, 0); font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;"
dir="ltr" data-setdir="false">Best regards,</div>
<div
style="color: rgb(0, 0, 0); font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;"
dir="ltr" data-setdir="false">Alpin N. Tatan</div>
<div
style="color: rgb(0, 0, 0); font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;"
dir="ltr" data-setdir="false">University of Tokyo</div>
</div>
</div>
<br>
<fieldset class="moz-mime-attachment-header"></fieldset>
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</blockquote>
<div class="moz-signature">-- <br>
<small>Dr. Lorenzo Paulatto<br>
IdR @ IMPMC - CNRS UMR 7590 & Sorbonne Université<br>
phone: +33 (0)1 442 79822 / skype: paulatz<br>
<a href="http://www.impmc.upmc.fr/~paulatto/"
class="moz-txt-link-freetext">http://www.impmc.upmc.fr/~paulatto/</a>
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