<div dir="ltr">Dear Thierry<div><br></div><div>I faced the same Cholesky problem in my calculation. Although, I calculated 2000 bands. The problem was gone when we used 'cg' diagonalization. I also reduced the convergence threshold to 1d-8. Although, the simulation became very slow, possibly due to 'cg' diagonalization.</div><div><br></div><div>Thanks</div><div>Kanak</div><div class="gmail_extra"><br clear="all"><div><div class="m_-6085287355105001169gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div><div dir="ltr">______________________________<wbr>_________<div>Kanak Datta</div><div>Graduate Student</div><div>Electrical Engineering and Computer Science</div><div>University of Michigan, Ann Arbor</div></div></div></div></div></div>
<br><div class="gmail_quote">On Wed, Apr 5, 2017 at 11:22 AM, Thierry Clette <span dir="ltr"><<a href="mailto:thierry.clette@uclouvain.be" target="_blank">thierry.clette@uclouvain.be</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hello,<br>
<br>
I want to do some nscf calculations in order to compute GW corrections afterwards. I know that I need a lot of bands to converge, around 3000 (I already did some convergence studies in another code).<br>
A example of an input is attached.<br>
This seems to be a problem for the code, as when I go higher than about 500 bands, I get the ¨error computing cholesky¨, which means the diagonalization fails.<br>
<br>
I read a lot of different topics in the mailing list reporting this problem, with various solutions such as :<br>
- parallelization on bands<br>
- CG diagonalization<br>
- bigger ¨diago_thr_init¨ (even if I need to be quite precise in the end)<br>
- beginning from a previous calculation with ~500 bands.<br>
<br>
I tried different things and it still didn't work. BTW, I know the calculation is possible, because I did it without problems in Abinit with the same parameters (Abinit seems to work differently).<br>
<br>
At this stage, I really don't know what I should do. Has someone already done successful calculations with so many bands ?<br>
<br>
Thanks in advance,<br>
<br>
Thierry Clette<br>
<br>
<br>
<br>
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