OK.
I'm not entirely clear how to coordinate different memory and disk footprints, particularly when using the C++ interface. The steps I know about: 1. Open the file 2. Open the DataSet. 3. Obtain the DataSpace from the Dataset. 4. Select a hyperslab to read data into a voxel buffer. I select a hyperslab from the dataset to read based on the image region specified by the user. It's a little more complicated than that in ITK, but that summarizes the process. At what stage in the process do I specify a different in-memory dataspace? And how do I specify it's position in the larger on-disk dataspace? If there's example code in the manual, just point me there. On 5/3/11 10:56 AM, "Quincey Koziol" <[email protected]> wrote: >Hi Kent, > >On May 3, 2011, at 10:16 AM, Williams, Norman K wrote: > >> I am using the H5Sselect_hyperslab method for both reading and writing >> already. Additionally when I write out an image, I 'chunk' the output >>and >> compress it. >> >> >> The question I have is what I can do to minimize the memory footprint. >> Based on my reading in the documentation, the Hyperslab interface >>actually >> scatters/gathers to/from an in-memory dataset, leading me to believe the >> entire dataset will be allocated in system memory. >> >> So the question is how would I use HDF5 in such a way as to minimize the >> memory footprint in this context? > > You are allowed to create a memory dataspace that is different from >the dataset's dataspace in the file. That will allow you to tune the >memory footprint. > ________________________________ Notice: This UI Health Care e-mail (including attachments) is covered by the Electronic Communications Privacy Act, 18 U.S.C. 2510-2521, is confidential and may be legally privileged. If you are not the intended recipient, you are hereby notified that any retention, dissemination, distribution, or copying of this communication is strictly prohibited. Please reply to the sender that you have received the message in error, then delete it. Thank you. ________________________________ _______________________________________________ Hdf-forum is for HDF software users discussion. [email protected] http://mail.hdfgroup.org/mailman/listinfo/hdf-forum_hdfgroup.org
