pnetcdf I/O inefficiency problem

[Wei-keng Liao]

Hi, Darin

Could you let me know what version of PnetCDF you are using?
Also, could you extract your codes to a short program, so I can
give it a try?

Wei-keng

> On Mar 21, 2019, at 1:52 AM, 萧 澍 via parallel-netcdf <parallel-netcdf at lists.mcs.anl.gov> wrote:
> 
> Hi,
> This is Darin Shaw, a ordinary user of pnetcdf. Recently, I tackle a problem about the I/O, when I try to read variables from nc file with over 2k processors (every processor read a part of data), nc file reading efficiency is extremely slow, while reading efficiency is normal with less than 2k processors. I find that program halt in function ‘nfmpi_iget_vara_double’.
> Do you meet the same kind of problem before or have any advice on how to solve it?
> Thanks,
> Darin