<div dir="ltr"><br><div class="gmail_extra"><br><div class="gmail_quote">On Thu, Jun 4, 2015 at 1:45 PM, saswata halder <span dir="ltr"><<a href="mailto:sanky.h@gmail.com" target="_blank">sanky.h@gmail.com</a>></span> wrote:<br><br><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div class=""><div class="h5">
"from checkallsym : error # 1<br>
some of the original symmetry operations not satisfied ."<br></div></div></blockquote><div><br></div><div>numerical noise may lead to the loss of the original symmetry. This usually happens after many iterations.<br>If it happens after the first calculation, you have constraints that break the symmetry.<br><br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div class=""><div class="h5">
etot_conv_thr=1.0D-8<br></div></div></blockquote><div> </div><div class="h5">you do not need such a low threshold<br><br>> forc_conv_thr=1.0D-6<br><br>as above<br><br>> press_conv_thr=0.2D0<br><br>this is not here but in &cell<br><br>> disk_io='high'<br><br></div><div class="h5">do not use this unless you have a good reason to<br><br> > ecutwfc = 80.0, ecutrho=800<br><br>you should not specify ecutrho for norm-conserving pseudopotentials<br><br>> occupations='fixed', smearing='gaussian', degauss=0.07<br><br></div><div class="h5">incompatible options: do you want fixed occupancies or smearing?<br><br> > diagonalization='cg',<br><br>don't use this unless you have a good reason to<br><br>> conv_thr = 1.0D-9<br><div><br></div>usually you do not need such a low threshold<br><br>
> electron_maxstep=1000<br><br></div><div class="h5">way too many<br></div><div class="h5">
<br>> O 0.245 0.00 0.00 1 0 0<br>
> O 0.755 0.00 0.00 1 0 0<br>
> O 0.00 0.245 0.00 0 1 0<br>
> O 0.00 0.755 0.00 0 1 0<br>
> O 0.00 0.00 0.245 0 0 1<br>
> O 0.00 0.00 0.755 0 0 1<br>
<br></div><div class="h5">if you fix positions (the "0" in the last three columns), you may break symmetry<br><br>> It would be helpful if you can please explain what the error means and<br>
> suggest how I can fix it so that I may carry out the phonon calculations.<br><br></div><div class="h5">don't even think performing a phonon calculation until you fully understand self-consistent calculations<br></div><br></div><div class="gmail_quote">Paolo<br></div></div></div>