Nick, how are you? In order to take advantage of dense attribute storage you must use the latest version of the file format when creating objects. Use H5Pset_libver_bounds with a libver_low of H5F_LIBVER_18 (or H5F_LIBVER_LATEST). Neither method (H5Pset_libver_bounds, H5Pset_attr_phase_change) was included in HDF5DotNet. However, it will be included in the forthcoming HDF.PInvoke set of bindings.
Best regards, Gerd From: Hdf-forum [mailto:[email protected]] On Behalf Of Nick Dodds Sent: Wednesday, February 3, 2016 8:39 AM To: [email protected] Subject: [Hdf-forum] HDF5DOTNET Dense Attribute Storage Hello, Ive created a project using HDF5DOTNET and rely heavily on attributes for storing meta data about data sets. When I load an HDF5 file, I want to read all the data set attributes for all the data sets. Unfortunately this is very slow when I have a large number of data sets. Firstly, I understand that I could re-write my code using datasets in place of attributes, but Im trying to avoid that as I like my current H5 file structure. I want to switch to dense storage of attributes to speed up this process. However, Im struggling to understand how to do this, specifically with HDF5DOTNET. HDF5 Questions (not related to HDF5DOTNET): 1. I understand that H5Pset_attr_phase_change property can be used with creation of H5Files. Is this the general method for using dense attribute storage or is there a more explicit method to use when creating attributes (or datasets/groups)? HDF5DOTNET Questions: 1. I could not find any any wrapper functions for H5Pset_attr_phase_change in HDF5DOTNET. Is there an equivalent function or some method for ensure dense attribute storage which is currently supported. Thanks, - Nick
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