On Tue, 2010-12-07 at 13:33 -0800, Werner Benger wrote: > Does the HDF5 API already support > using such hints? It seemed ok to have two levels of caching in my > case (such as application-internal and HDF5/OS internal), as the entire > system was supposed to stay at 30% overall RAM usage anyway to leave space > for other applications running on the same machine. Probably those direct > I/O > parameters could help to optimize this somewhat and make more efficient > usage of the available memory, but so far there was no urgent need for it. > Might be worth consideration on future improvements, though.
Well, I thought the posix_fadvise and O_DIRECT stuff in theory should make the I/O itself FASTER as it eliminates the extra level of caching. No, HDF5 lib proper doesn't offer controls for posix_fadvise/posix_madvise. You have to handle via VFD's. > -- 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)-753-8511 _______________________________________________ Hdf-forum is for HDF software users discussion. [email protected] http://mail.hdfgroup.org/mailman/listinfo/hdf-forum_hdfgroup.org
