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Conference turris::digital_unix

Title:	DIGITAL UNIX(FORMERLY KNOWN AS DEC OSF/1)
Notice:	Welcome to the Digital UNIX Conference
Moderator:	SMURF::DENHAM

Created:	Thu Mar 16 1995
Last Modified:	Fri Jun 06 1997
Last Successful Update:	Fri Jun 06 1997
Number of topics:	10068
Total number of notes:	35879

9425.0. "Direct I/O question" by HYDRA::LNARAYAN () Tue Apr 08 1997 10:51

    Hello
    
    SGI has an option for direct I/O (not through the buffer cache) which
    we have observed to provide a SIGNIFICANT performance benefit.  To use
    direct I/O on SGI systems, the file is opened with the O_DIRECT flag. 
    Transfers must be between 4Kb and 4Mb and must start on a 512 byte memory
    boundary.
    
    Is there anything similar under DEC UNIX?
    
    Thanks In Advance
    Lakshminarayanan

T.R	Title	User	Personal Name	Date	Lines
9425.1		KITCHE::schott	Eric R. Schott USG Product Management	`Tue Apr 08 1997 11:04`	3
	Direct I/O is planned for Steel. You can also use memory mapped files now to avoid extra copies.