Parallel netCDF in 64 bits environment

[Yu-Heng Tseng]

Hi Jianwei,

Thanks so much for your information. It's very helpful. I got it worked 
in 64bits mode on Seaborg at NERSC.
There is a minor problem in test case under test/fandc csnap for 64bits 
option. Probably a bug in Makefile
The compiler is doing well in Fortran but it compile csnap using 32 bits 
in C and link using 64 bits. A flag should be added in compiling.

Cheers

Yu-heng
Jianwei Li wrote:

>
> Hi, Yu-heng,
>
> We have already successfully built our pnetCDF on an IBM SP2 in
> 64-bit mode. As documented in README.SP, the following setting
> was used:
>
>    setenv OBJECT_MODE 64
>    setenv MPICC  mpcc_r
>    setenv MPIF77 mpxlf_r
>    setenv F77    xlf
>    setenv FC     xlf
>    setenv CC     xlc
>    setenv CXX    xlC
>    setenv CFLAGS -q64
>    setenv FFLAGS -q64
>    setenv F90FLAGS -q64
>    setenv CXXFLAGS -q64
>
> Please let us know if it still doesn't work. And Thanks!
>
> As to netCDF-4.0, as far as I know, it will be built on top of
> HDF5, with HDF5 parallel I/O support atop of MPI-IO and new
> netCDF API semantics. The physical File Format should be in HDF5.
> So, the design, implementation, performance and compatibility
> will be quite different between netCDF-4.0 and PnetCDF.
> So far, PnetCDF is the only public one that provides high
> performance parallel I/O support for traditional netCDF file
> format.
>
> Jianwei
>
> On Mon, 18 Apr 2005 YHTseng at lbl.gov wrote:
>
>> Hi
>>
>> I am trying to utilize the parallel netCDF
>> in an existing code to replace its netCDF I/O.
>> I realized that the current version (parallel netCDF-pre1)
>> couldn't compile sucessfully using 64 bit (-q64) flag.
>> Do we have 64 bits parallel netCDF now or we
>> have to convert it on our own?
>>
>> netCDF 4.0 now uses HDF5 to handle its I/O
>> and possibly has parallel I/O capacity.
>> Any particular difference between netCDF 4.0 and parallel netCDF?
>>
>> Thanks for the help and clarification!
>>
>> Yu-heng
>>
>
> On Tue, 5 Apr 2005 YHTseng at lbl.gov wrote:
>
>> Hi
>>
>> I just started to test the parallel netCDF with IBM SP2. However, it
>> seems
>> the test examples are not working well. Am I doing something wrong?
>> I copy an existing xxx.nc file to test.nc
>> and run nf_test
>>
>> However, it keeps telling me mpi file is not found. test.nc is the
>> only file
>> we need, right?
>> Hope anyone can help me out. Thanks.
>> Also what's the status of parallel netCDF development? Any progress
>> since last
>> December?
>>
>> Cheers
>>
>> Yu-heng
>
>