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Hi Divyanshu, From your description it sounds like the file written is corrupted? And when you say "The error also doesn't appear when I use fewer processes on a single node on the cluster. " Do you mean use fewer processes to write</div>
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<div dir="ltr"><div class="gmail_default" style="font-family:comic sans ms,sans-serif;color:#38761d">Hi Divyanshu,</div><div class="gmail_default" style="font-family:comic sans ms,sans-serif;color:#38761d"><br></div><div class="gmail_default" style="font-family:comic sans ms,sans-serif;color:#38761d">From your description it sounds like the file written is corrupted? And when you say "The error also doesn't appear when I use fewer processes on a single node on the cluster." Do you</div><div class="gmail_default" style="font-family:comic sans ms,sans-serif;color:#38761d">mean use fewer processes to write the file or to read the file? It really sounds to me like an application problem and not a pnetcdf or mpi issue. I think that you may need to provide</div><div class="gmail_default" style="font-family:comic sans ms,sans-serif;color:#38761d">an exact description of how the problem is created including the system you are using, the mpi library and version as well as the pnetcdf version and the application. </div><div class="gmail_default" style="font-family:comic sans ms,sans-serif;color:#38761d"><br></div><div class="gmail_default" style="font-family:comic sans ms,sans-serif;color:#38761d">Jim</div></div><br><div class="gmail_quote gmail_quote_container"><div dir="ltr" class="gmail_attr">On Fri, Jul 11, 2025 at 4:13 PM Divyanshu Gola <<a href="mailto:divyans@umich.edu">divyans@umich.edu</a>> wrote:<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="msg-5776720769699647019">
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Hi, This is a shot in the dark but I thought why not. The exact same code that I had been using until a few weeks ago gives me an error when I am trying to read restart files using PNetcdf. The error is Index exceeds dimension bounds, or Start+Count</div>
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<div dir="ltr">Hi,<div><br></div><div>This is a shot in the dark but I thought why not. </div><div><br></div><div>The exact same code that I had been using until a few weeks ago gives me an error when I am trying to read restart files using PNetcdf. The error is <b>Index exceeds dimension bounds, or Start+Count exceeds dimension bounds. </b>Based on days of debugging, I have narrowed it down to some problem during the writing of the restart files (and not the reading itself). All of these errors seem to originate from the way PNetcdf is built and the MPI file system used on the cluster (because I can run the same code on a different cluster), but I can't seem to identify the root cause. The error also doesn't appear when I use fewer processes on a single node on the cluster.</div><div><br></div><div>I know this is most likely not a bug in the PNetcdf library but something else, but I was wondering if people on this mailing list have encountered a similar issue.</div><div><br></div><div>Apologies for the long email and thanks</div><div><br></div><div>Divyanshu </div><div><br></div><div>Postdoctoral Researcher</div><div>University of Michigan</div></div>
</div></blockquote></div><div><br clear="all"></div><br><span class="gmail_signature_prefix">-- </span><br><div dir="ltr" class="gmail_signature"><div dir="ltr"><div><div><div>Jim Edwards<br></div><div>STAND UP FOR SCIENCE</div><font size="1">CESM Software Engineer<br></font></div><font size="1">National Center for Atmospheric Research<br></font></div><div><font size="1">Boulder, CO</font> </div><br></div></div>