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<p>Images are only used inside each q-point, if I remember
correctly, so it would not matter in our question.<br>
</p>
<p>But, you can decrease walltime much more by running each q-point
simultaneously and independently using startq, startq options and
a job for each. It is sufficient to use a different prefix or
outdir. The data from pw can be copied or repeated, it does not
usually matter in terms of CPU time.</p>
<p>cheers<br>
</p>
On 2020-11-24 10:27, Kiran Yadav wrote:<br>
<blockquote type="cite"
cite="mid:CAALj=363SK06S_6Rc0017==SotYDN_2KAtC5ebbf+JJ7w711OQ@mail.gmail.com">
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<div>Dear Lorenzo,</div>
<div>Is there any parallelization method so that I can make
images such that 20 dyn files will get distributed unequally
on the equal number of processors or dyn files will get
distributed equally on unequal number of processors ?</div>
<div><br>
</div>
<div>Because in my case as per my observation dyn1-10 are
not taking too much time, most of the time has been spent on
dyn11-dyn20 generation. So, If I could run dyn 1-10 on one
image and distribute remaining dyn11-20 on 3 images CPU
walltime can be decreased. Is it possible to do something like
that? </div>
<div><br>
</div>
<div>I tried parallelization on 256 processors (#PBS -l
select=16:ncpus=16) for 10hrs using the
following parallelization command</div>
<div>time -p mpirun -np $PBS_NTASKS ph.x -ni 4 -nk 4 -nt 4 -nd
16 -input <a href="http://ph.in/" target="_blank"
moz-do-not-send="true">ph.in</a> > ph.out<br>
</div>
<div>in this case 20dyn files got distributed in 4 images i.e 5
dyn on one image. 256/4=</div>
<div><br>
</div>
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<div dir="ltr"><font
face="verdana, sans-serif">Thanks
& Regards,<br>
</font></div>
<div dir="ltr"><font
face="verdana, sans-serif">Kiran
Yadav</font></div>
<div dir="ltr">
<div><font face="verdana,
sans-serif">Research
Scholar</font></div>
<div><font face="verdana,
sans-serif">Electronic
Materials Laboratory
(TX-200G)</font></div>
<div><font face="verdana,
sans-serif">Dept. of
Materials Science &
Engineering</font></div>
<div><font face="verdana,
sans-serif">Indian
Institute of Technology,
Delhi</font></div>
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<div><i><br>
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<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Tue, Nov 24, 2020 at 1:19
PM Lorenzo Paulatto <<a href="mailto:paulatz@gmail.com"
target="_blank" moz-do-not-send="true">paulatz@gmail.com</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"><br>
> I have been trying to calculate Phonon dispersion with
6*6*6 nq grid. <br>
> It generates dyn0+20 other dynamical matrices, but
the time taken by <br>
> each dynamical matrix file is different for completion. I
ran these <br>
> phonon dispersion calculations using parallelization, but
couldn't <br>
> optimize correctly.<br>
<br>
This is normal, because different q-points have different
symmetries, <br>
the code has to use different numbers of k-points.<br>
<br>
<br>
regards<br>
<br>
<br>
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<pre class="moz-quote-pre" wrap="">_______________________________________________
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