I tried sieve buf setting. It has no effect either. But, thats kinda what I expected as docs indicate that really has to do with chunking for chunked datasets. Mine are contiguous.
Mark On Wed, 2010-03-03 at 13:04, Quincey Koziol wrote: > Hi Mark, > > On Mar 3, 2010, at 12:51 PM, Mark Miller wrote: > > > Hi All, > > > > I am seeing some behavior in some tests that I am doing that suggests > > that on the sec2 vfd (or any vfd I've tried) the small data block size > > property (H5Pset_small_data_block_size) is having no effect in changing > > I/O requests to underlying system I/O interface. > > > > Does anyone have experience using this file access property such that > > they KNOW FOR CERTAIN it is taking effect and indeed resulting in > > different (lower) I/O request frequency to underlying I/O interface? > > This API routine is only used to "push" allocation of the space for > storing small dataset raw data together in the file. It has no effect on I/O > requests to the underlying system. H5Pset_sieve_buf_size may help you out > though... > > Quincey > > > _______________________________________________ > Hdf-forum is for HDF software users discussion. > [email protected] > http://*mail.hdfgroup.org/mailman/listinfo/hdf-forum_hdfgroup.org -- Mark C. Miller, Lawrence Livermore National Laboratory ================!!LLNL BUSINESS ONLY!!================ [email protected] urgent: [email protected] T:8-6 (925)-423-5901 M/W/Th:7-12,2-7 (530)-753-851 _______________________________________________ Hdf-forum is for HDF software users discussion. [email protected] http://mail.hdfgroup.org/mailman/listinfo/hdf-forum_hdfgroup.org
