| 21.0 |
Parallel I/O
Parallel I/O allows each processor in a multi-processor system to read and write data independently. |
| 21.1 |
Introduction to Parallel I/O
Parallel I/O allows many processes to read/write netCDF data at the same time. |
| 21.2 |
The pNetCDF Package
The parallel-netcdf (formerly "pnetcdf") package from Argonne and Northwestern can be used for parallel I/O with classic netCDF data. |
| 21.3 |
Parallel I/O in NetCDF-4
NetCDF-4 exposes the parallel I/O features of HDF5. |
| 21.4 |
Building NetCDF-4 with Parallel I/O
You must build netCDF-4 properly to take advantage of parallel features. |
| 21.5 |
Using Parallel I/O in NetCDF-4
How to actually use parallel I/O in netCDF-4. |
| 21.6 |
Collective and Independent Operations with Parallel I/O in NetCDF-4
Some netCDF operations are collective (must be done by all processes at the same time), and others are independent (can be done by any process at any time.) |
| 21.7 |
Parallel I/O Example
This example is from nc_test4/tst_parallel.c, and is run by make check on platforms with MPI/IO support. |
| 21.8 |
Example of Simple Parallel I/O Access
The nc_test4/tst_parallel3.c program provides an example of parallel I/O. |
| 21.9 |
Example of Simple Parallel I/O Access (part 2)
The nc_test4/tst_parallel3.c program provides an example of parallel I/O. |
| 21.10 |
Using NetCDF Parallel I/O in Fortran 90
Using netCDF-4 parallel I/O in Fortran 90 is easy. |
| 21.11 |
Jumpshot Graph of Independent Parallel Data Writes
The jumpshot output shows four processors independently writing netCDF data. |
| 21.12 |
Jumpshot Graph of Collective Parallel Data Writes
The jumpshot output shows four processors collectively writing netCDF data. |