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Hello, </div>
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I’d like to use parallel netcdf in C to read the only variable from a 16GB netcdf file and perform some operations. </div>
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The file format is classic, and was created with netcdf 3.6.3. I’m using openmpi 1.6.3 and pnetcdf 1.4.1.</div>
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<div style="color: rgb(0, 0, 0);"><font face="Calibri,sans-serif" style="font-size: 14px;">I’ve tested on a separate netcdf-4 formatted file, and the reading works fine, but on the classic file, I get the error </font><span style="font-size: 11px; font-family: Menlo;">NetCDF:
One or more variable sizes violate format constraints </span>when I try to open the file (ncmpi_open).</div>
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<font face="Calibri,sans-serif">A stripped down version of the C code is b</font>elow.</div>
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<div style="font-size: 14px; font-family: Calibri, sans-serif;">Your help is much appreciated.</div>
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<div style="font-size: 14px; font-family: Calibri, sans-serif;">Cheers,</div>
<div style="font-size: 14px; font-family: Calibri, sans-serif;">Felicity</div>
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<p style="margin: 0px; font-size: 11px; font-family: Menlo;">#include <stdio.h></p>
<p style="margin: 0px; font-size: 11px; font-family: Menlo;">#include <mpi.h></p>
<p style="margin: 0px; font-size: 11px; font-family: Menlo;">#include <pnetcdf.h></p>
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<p style="margin: 0px; font-size: 11px; font-family: Menlo;">#define FILE_NAME “<path_to_file>/hf_topog.nc"</p>
<p style="margin: 0px; font-size: 11px; font-family: Menlo;">#define VAR_NAME "hf_topog"</p>
<p style="margin: 0px; font-size: 11px; font-family: Menlo; min-height: 13px;"><br>
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<p style="margin: 0px; font-size: 11px; font-family: Menlo;">#define CHECK_ERR {\</p>
<p style="margin: 0px; font-size: 11px; font-family: Menlo;"> if (err!=NC_NOERR) {\</p>
<p style="margin: 0px; font-size: 11px; font-family: Menlo;"> printf("Error at line=%d: %s\n", __LINE__, ncmpi_strerror(err));\</p>
<p style="margin: 0px; font-size: 11px; font-family: Menlo;"> goto fn_exit;\</p>
<p style="margin: 0px; font-size: 11px; font-family: Menlo;"> }}</p>
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<p style="margin: 0px; font-size: 11px; font-family: Menlo;">int main(int argc, char **argv)</p>
<p style="margin: 0px; font-size: 11px; font-family: Menlo;">{</p>
<p style="margin: 0px; font-size: 11px; font-family: Menlo;"> int err, varid, ncid;</p>
<p style="margin: 0px; font-size: 11px; font-family: Menlo;"> float * topog_in;</p>
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<p style="margin: 0px; font-size: 11px; font-family: Menlo;"> MPI_Init(&argc,&argv);</p>
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<p style="margin: 0px; font-size: 11px; font-family: Menlo;"> err = ncmpi_open(MPI_COMM_WORLD, FILE_NAME, NC_NOWRITE, MPI_INFO_NULL, &ncid);</p>
<p style="margin: 0px; font-size: 11px; font-family: Menlo;"> CHECK_ERR;</p>
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<p style="margin: 0px; font-size: 11px; font-family: Menlo;"> err = ncmpi_close(ncid);</p>
<p style="margin: 0px; font-size: 11px; font-family: Menlo;"> CHECK_ERR;</p>
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<p style="margin: 0px; font-size: 11px; font-family: Menlo;">fn_exit:</p>
<p style="margin: 0px; font-size: 11px; font-family: Menlo;"> MPI_Finalize();</p>
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<p style="margin: 0px; font-size: 11px; font-family: Menlo;"> return 0;</p>
<p style="margin: 0px; font-size: 11px; font-family: Menlo;">}</p>
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