HDF5 Dependency

This VOL connector was tested with the version of the HDF5 dev branch as of April 20, 2020, but you don't necessarily need that particular version.

Note: Make sure you have libhdf5 shared dynamic libraries in your hdf5/lib. For Linux, it's libhdf5.so, for OSX, it's libhdf5.dylib.

Generate HDF5 shared library

If you don't have the shared dynamic libraries, you'll need to reinstall HDF5.

• Get the latest version of the develop branch;
• In the repo directory, run ./autogen.sh
• In your build directory, run configure and make sure you DO NOT have the option "--disable-shared", for example:

  env CC=mpicc ../hdf5_dev/configure --enable-build-mode=debug --enable-internal-debug=all --enable-parallel

• make; make install

Settings

Change following paths in Makefile:

• HDF5_DIR: path to your hdf5 install/build location, such as hdf5_build/hdf5/
• SRC_DIR: path to this VOL connector source code directory.

Build the pass-through VOL library and run the demo

Type make in the source dir and you'll see libh5passthrough_vol.so, which is the pass -hrough VOL connector library. To run the demo, set following environment variables first:

export HDF5_PLUGIN_PATH=PATH_TO_YOUR_pass_through_vol
export HDF5_VOL_CONNECTOR="pass_through_ext under_vol=0;under_info={};"
export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:PATH_TO_YOUR_hdf5_build/hdf5/lib:$HDF5_PLUGIN_PATH

on MacOS, use DYLD_LIBRARY_PATH instead of LD_LIBRARY_PATH

You can run "HDF5_DIR/bin/h5ls sample.h5", and it should show many lines of debugging info like:

------- EXT PASS THROUGH VOL INIT
------- EXT PASS THROUGH VOL INFO String To Info
------- EXT PASS THROUGH VOL INFO Copy

By default, the debugging mode is enabled to ensure the VOL connector is working. To disable it, simply remove the $(DEBUG) option from the CC line, and rerun make.