<html><head><style type='text/css'>p { margin: 0; }</style></head><body><div style='font-family: times new roman,new york,times,serif; font-size: 12pt; color: #000000'>Thank you, Lorenzo, for reporting it;<br>I have tried with the latest repo, and indeed, it hangs out with mesh.h5m.<br><br>I have tried with bridge dimension 0 and 1, and it seems to get out of ghosting;<br>So for bridge dimension 2 that you are using, there is a problem.<br><font face="courier new,courier,monaco,monospace,sans-serif">"<br> if (pcomm->rank() == 0)<br> std::cout<<pcomm->rank()<<" Exchange ghost cells"<<std::endl;<br> result = pcomm->exchange_ghost_cells(dim,<font color="#ff0000">1</font>,1,0,true,true);<br> assert(MB_SUCCESS==result);<br>"</font><br>In the meantime, can you use bridge 0 or 1? <br><br>Thanks,<br>Iulian<br><br><hr id="zwchr"><blockquote style="border-left:2px solid #1010FF;margin-left:5px;padding-left:5px;color:#000;font-weight:normal;font-style:normal;text-decoration:none;font-family:Helvetica,Arial,sans-serif;font-size:12pt;">Dear all,<br>I’m writing to inform you all of a problem with MOAB in parallel that bothers me a lot.<br>Sometimes after reading a parallel .h5m mesh file and resolving shared entities the execution hangs while exchanging ghost cells.<br>The issue arises randomly but I noticed a clear tendency to occur when the number of elements in each partition decreases, that is, given the same mesh, when the number of partition increases.<br>Here attached is a simple code that should allow you to reproduce the issue (I tried to run both with 4.6.0 and trunk and obtain the same behavior).<br>mesh.h5m and mesh_ok.h5m are two different 16 part partitions of the same mesh (a 3D tetrahedral elements mesh). <br>While with mesh_ok.h5m the code works perfectly, using mesh.h5m it hangs, meaning that the process with rank 1 does not return from exchange_ghost_cells if the code is executed in parallel with 16 processors (mpiexec -n 16 <reader_exec_name>). <br>The weird thing is that the code works if executed on less that 16 processors <br><br>Any help is appreciated. Thanks in advance.<br>Lorenzo<br><br><br><br><br></blockquote><br></div></body></html>