HDF5 Library Environment Variables and Configuration Parameters
1. Environment Variables
The HDF5 library uses UNIX environment variables to control
or adjust certain library features at runtime. The variables and
their defined effects are as follows:
- HDF5_DEBUG
- Defines a list of debugging switches documented in the
Debugging section of the
HDF5 User's Guide.
- HDF5_NOCLEANUP
- When set to a non-empty value, the programs in the test
directory do not remove temporary HDF5 data files.
The default is for each test to remove the files before exit.
- HDF5_MPI_OPT_TYPES
(for parallel beta version only)
- When set to
1, PHDF5 will use the MPI optimized
code to perform parallel read/write accesses to datasets.
Currently, this optimization fails when accessing extendable
datasets. The default is not to use the optimized code.
- HDF5_MPI_1_METAWRITE
(for parallel beta version only)
- When set to
1, PHDF5 will write the metadata
via process 0 of each opened parallel HDF5 file. This should
improve I/O throughput. The default is not to use this
optimization.
2. Configuration Parameters
The HDF5 configuration script accepts a list of parameters to control
configuration features when creating the Makefiles for the library.
The command
configure --help
will display the current list of parameters and their effects.
HDF Help Desk
Last modified: 9 September 1998