Commit b08261ed authored by Jan Siwiec's avatar Jan Siwiec

Update hdf5.md

parent b3ccb874
Pipeline #11151 passed with stages
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......@@ -21,10 +21,10 @@ Versions **1.8.11** and **1.8.13** of HDF5 library are available on Anselm, comp
$ ml hdf5-parallel
```
The module sets up environment variables, required for linking and running HDF5 enabled applications. Make sure that the choice of HDF5 module is consistent with your choice of MPI library. Mixing MPI of different implementations may have unpredictable results.
The module sets up environment variables required for linking and running HDF5 enabled applications. Make sure that the choice of the HDF5 module is consistent with your choice of the MPI library. Mixing MPI of different implementations may have unpredictable results.
!!! note
Be aware, that GCC version of **HDF5 1.8.11** has serious performance issues, since it's compiled with -O0 optimization flag. This version is provided only for testing of code compiled only by GCC and IS NOT recommended for production computations. For more information, see: <http://www.hdfgroup.org/ftp/HDF5/prev-releases/ReleaseFiles/release5-1811>
Be aware that GCC version of **HDF5 1.8.11** has serious performance issues, since it is compiled with the -O0 optimization flag. This version is provided only for testing of code compiled only by GCC and IS NOT recommended for production computations. For more information, see: <http://www.hdfgroup.org/ftp/HDF5/prev-releases/ReleaseFiles/release5-1811>
All GCC versions of **HDF5 1.8.13** are not affected by the bug, are compiled with -O3 optimizations and are recommended for production computations.
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