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File Mapping   

The sun4_Solaris and alpha_OSF1 implementations of HDS currently provide a choice between the use of file mapping to perform I/O operations on primitive objects and the use of direct read/write operations. This is selectable via the `MAP' tuning parameter (see §[*]). The default is to use file mapping on both systems.

Only read/write operations will be supported on other systems, regardless of the setting of the `MAP' tuning parameter.



next up previous
Next: Scratch Files
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Previous: Wild-Card File Searching

HDS Hierarchical Data System
Starlink User Note 92
R.F. Warren-Smith & M.D. Lawden
23rd February 1999
E-mail:rfws@star.rl.ac.uk

Copyright (C) 1999 Central Laboratory of the Research Councils