This occurs on the ncsa machine bluewaters. I am using pnetcdf1.2.0 and pgi 11.10.0<br><br>The issue is that calling nfmpi_createfile would sometimes result in an error:<br><br>MPI_File_open : Other I/O error , error stack:<br>
(unknown)(): Other I/O error <br>126: MPI_File_open : Other I/O error , error stack:<br>(unknown)(): Other I/O error <br> Error on create : 502 -32 <br><br clear="all"><br>The error appears to be intermittent and I could not get it to occur at all on a small number of tasks (160) but it occurs with high frequency when using a larger number of tasks (>=1600). I traced the problem to the use of nf_clobber in the mode argument, removing the nf_clobber seems to have solved the problem and I think that create implies clobber anyway doesn't it? Can someone who knows what is going on under the covers enlighten me with some understanding of this issue? I suspect that one task is trying to clobber the file that another has just created or something of that nature.<br>
<br><br>-- <br>Jim Edwards<br><br><font>CESM Software Engineering Group<br>National Center for Atmospheric Research<br>Boulder, CO <br>303-497-1842<br></font><br>