Due to the current gap in continued funding from the U.S. National Science Foundation (NSF), the NSF Unidata Program Center has temporarily paused most operations. See NSF Unidata Pause in Most Operations for details.
Due to the current gap in continued funding from the U.S. National Science Foundation (NSF), the NSF Unidata Program Center has temporarily paused most operations. See NSF Unidata Pause in Most Operations for details.
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Hi I'm continuing to look at NetCDF-4 and have found that it's not actually doing collective I/O. Even though it's the default, I've called nc_var_par_access with NC_COLLECTIVE just to be sure. I can verify in Jumpshot that all (in this case) 4 processors are calling independent I/O routines (MPI_File_write_at), even though I was expecting to see collective I/O (MPI_File_write_all or MPI_File_write_at_all). This appears to be the case for both writes and reads. In case it matters, I'm using an exceedingly small dataset. ==rob -- Rob Latham Mathematics and Computer Science Division A215 0178 EA2D B059 8CDF Argonne National Lab, IL USA B29D F333 664A 4280 315B
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