netCDF Support for In-Memory Files

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Presentation transcript:

netCDF Support for In-Memory Files Dr. Dennis Heimbigner Unidata netCDF Workshop October 25, 2012

The NC_DISKLESS MODE FLAG New nc_open/nc_create mode flag: NC_DISKLESS Setting NC_DISKLESS causes netCDF to create the file only in memory Unless otherwise specified, the in-memory file will be destroyed when nc_close is called

NC_DISKLESS With nc_create() Can be used with netcdf-3 and netcdf-4 NC_DISKLESS flag only Create in memory Destroy on nc_close File path is ignored (NC_DISKLESS+NC_WRITE) At nc_close, store contents in the file whose path was specified in the nc_create call

NC_DISKLESS with nc_open() Can be used with netcdf-3 only NC_DISKLESS flag only Read into memory Destroy on nc_close (but leave disk file unchanged) (NC_DISKLESS+NC_WRITE) At nc_close, store contents back into the file

Performance Note(s) If NC_DISKLESS is going to be used for creating a large classic (netcdf-3) file Use nc__create() and specify an appropriately large value of the initialsz parameter This avoids too many in-memory heap reallocations

Uses Temporary files Re-organizing existing files Performance (when in-memory access is significantly faster than disk access) If you discover a new use case for NC_DISKLESS, let me know

Questions?