<div dir="ltr">Dear Paolo, <div><br></div><div>Unfortunately, there's not much to report so far. Many "relax" jobs for a system of ca. 500 atoms (including Fe) fail giving the same message Davide reported long time ago:</div><div>_________________<br></div><div><br></div><div><div>Fatal error in PMPI_Bcast: Other MPI error, error stack:</div><div>PMPI_Bcast(2434)........: MPI_Bcast(buf=0x8b25e30, count=7220, MPI_DOUBLE_PRECISION, root=0, comm=0x84000007) failed</div><div>MPIR_Bcast_impl(1807)...:</div><div>MPIR_Bcast(1835)........:</div><div>I_MPIR_Bcast_intra(2016): Failure during collective</div><div>MPIR_Bcast_intra(1665)..: Failure during collective</div></div><div>_________________</div><div><br></div><div>It only occurs in some architectures. The same inputs work for me in 2 other machines, so it seems to be related to the compilation. The support team of the HPC center I'm working on is trying to identify the problem. Also, it seems to occur randomly. In the sense that for some DFT+U calculations of the same type (same cutoffs, pp's, system) there is no problem at all. </div><div><br></div><div>I'll try to be more helpful next time, and I'll keep you updated.</div><div><br></div><div>Bests,</div><div>Sergi</div></div><div class="gmail_extra"><br><div class="gmail_quote">2016-11-23 15:21 GMT+01:00 Paolo Giannozzi <span dir="ltr"><<a href="mailto:p.giannozzi@gmail.com" target="_blank">p.giannozzi@gmail.com</a>></span>:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div>Thank you, but unless an example demonstrating the problem is provided, or at least some information on where this message come from is supplied, there is close to nothing that can be done<br><br></div>Paolo<br></div><div class="gmail_extra"><div><div class="h5"><br><div class="gmail_quote">On Wed, Nov 23, 2016 at 10:05 AM, Sergi Vela <span dir="ltr"><<a href="mailto:sergi.vela@gmail.com" target="_blank">sergi.vela@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">Dear Colleagues, <div><br></div><div>Just to report that I'm having exactly the same problem with DFT+U. The same message is appearing randomly only when I use the Hubbard term. I could test versions 5.2 and 6.0 and it occurs in both. </div><div><br></div><div>All my best,</div><div>Sergi</div><div class="gmail_extra"><br><div class="gmail_quote">2015-07-16 18:43 GMT+02:00 Paolo Giannozzi <span dir="ltr"><<a href="mailto:p.giannozzi@gmail.com" target="_blank">p.giannozzi@gmail.com</a>></span>:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div>There are many well-known problems of DFT+U, but none that is known to crash jobs with an obscure message.<br></div><div class="gmail_extra"><br><div class="gmail_quote"><span><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div><div style="direction:ltr;font-family:Tahoma;color:rgb(0,0,0);font-size:10pt">
Rank 21 [Thu Jul 16 15:51:04 2015] [c4-2c0s15n2] Fatal error in PMPI_Bcast: Message truncated, error stack:<br>
PMPI_Bcast(1615)..............<wbr>....: MPI_Bcast(buf=0x75265e0, count=160, MPI_DOUBLE_PRECISION, root=0, comm=0xc4000000) failed<br>
<span></span></div></div></blockquote><div><br></div></span><div>this signals a mismatch between what is sent and what is received in a broadcast operation. This may be due to an obvious bug, that however should show up at the first iteration, not after XX. Apart compiler or MPI library bugs, another reason is the one described in sec.8.3 of the developer manual: different processes following a different execution paths. From time to time, cases like this are found (the latest occurrence, in band parallelization of exact exchange) and easily fixed. Unfortunately, finding them (that is: where this happens) typically requires a painstaking parallel debugging.<span class="m_5943795887404165917m_-9086560091869352386HOEnZb"><font color="#888888"><br><br></font></span></div><span class="m_5943795887404165917m_-9086560091869352386HOEnZb"><font color="#888888"><div>Paolo<span class="m_5943795887404165917HOEnZb"><font color="#888888"><br></font></span></div></font></span></div></div><span class="m_5943795887404165917HOEnZb"><font color="#888888"><span class="m_5943795887404165917m_-9086560091869352386HOEnZb"><font color="#888888"><div class="gmail_extra">-- <br><div class="m_5943795887404165917m_-9086560091869352386m_-7569845848015661181gmail_signature"><div dir="ltr"><div><div dir="ltr"><span><span><font color="#888888">Paolo Giannozzi, Dept. Chemistry&Physics&Environment,<br>
Univ. Udine, via delle Scienze 208, 33100 Udine, Italy<br>
Phone <a href="tel:%2B39-0432-558216" value="+390432558216" target="_blank">+39-0432-558216</a>, fax <a href="tel:%2B39-0432-558222" value="+390432558222" target="_blank">+39-0432-558222</a></font></span></span></div></div></div></div>
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