Alpha release of PnetCDF 1.15.0

[Wei-Keng Liao]

Hello to the PnetCDF community,

The alpha release of version 1.15.0 is now available for downloading<https://urldefense.us/v3/__https://parallel-netcdf.github.io/wiki/Download.html__;!!G_uCfscf7eWS!c86Geqn4SqcC96enESWt6Lzxl-muozt2Gcl4I0npZloI2CrDoj-vnusXa3mOdFFtkccogO2nz_ok6oqVlj1U5UQwSWo2C8o$ >.

This release focuses on performance enhancement, particularly for applications
that use the Lustre file system. There is no changes in APIs. As the internal
implementation changes are quite significant, we provide this alpha release in
hopes of soliciting feedbacks from our users.

To get a rough idea of the performance improvement over the 1.14.1 version,
below shows some experimental results collected from running the I/O kernels of
E3SM and WRF on Perlmutter<https://urldefense.us/v3/__https://www.nersc.gov/what-we-do/computing-for-science/perlmutter__;!!G_uCfscf7eWS!c86Geqn4SqcC96enESWt6Lzxl-muozt2Gcl4I0npZloI2CrDoj-vnusXa3mOdFFtkccogO2nz_ok6oqVlj1U5UQwrYgd1oc$ > at NERSC. All I/O times are in seconds and I/O amounts
in GiB. The number of MPI processes allocated per compute node is 128.

E3SM-IO benchmark (https://urldefense.us/v3/__https://github.com/Parallel-NetCDF/E3SM-IO__;!!G_uCfscf7eWS!c86Geqn4SqcC96enESWt6Lzxl-muozt2Gcl4I0npZloI2CrDoj-vnusXa3mOdFFtkccogO2nz_ok6oqVlj1U5UQwsOwywyE$ )
Nodes   amount  1.14.1  1.15.0
I case  11      27.7    32.4s   3.8s
G case  75      79.7    28.6s   4.3s
F case  169     28.1    21.9s   1.5s


WRF-IO (https://urldefense.us/v3/__https://github.com/Parallel-NetCDF/PnetCDF/tree/master/benchmarks__;!!G_uCfscf7eWS!c86Geqn4SqcC96enESWt6Lzxl-muozt2Gcl4I0npZloI2CrDoj-vnusXa3mOdFFtkccogO2nz_ok6oqVlj1U5UQwaSpR3GE$ )
Nodes   amount  1.14.1  1.15.0
8       31.5    7.s5    3.0s
16      63.1    7.6s    3.2s
32      126.2   14.2s   4.2s
64      252.3   87.2s   9.8s
128     504.7   112.7s  14.7s


Please report problems encountered to this mailing list or create
github issues at https://urldefense.us/v3/__https://github.com/Parallel-NetCDF/PnetCDF__;!!G_uCfscf7eWS!c86Geqn4SqcC96enESWt6Lzxl-muozt2Gcl4I0npZloI2CrDoj-vnusXa3mOdFFtkccogO2nz_ok6oqVlj1U5UQwHnrIOhY$ 


Best regards,


Wei-keng Liao

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