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| Title: | Alpha Developer Support |
| Notice: | alpha-developer@digital.com, 800-332-4786 |
| Moderator: | HYDRA::SYSTEM |
|
| Created: | Mon Jun 06 1994 |
| Last Modified: | Fri Jun 06 1997 |
| Last Successful Update: | Fri Jun 06 1997 |
| Number of topics: | 3722 |
| Total number of notes: | 11359 |
3398.0. "Multipath Corporation" by HYDRA::LNARAYAN () Tue Mar 25 1997 19:41
Company Name : Multipath Corporation
Contact Name : Ron Young
Phone : (702) 831-4400
Fax : (702) 831-4401
Email : rcy@fmslib.com
Date/Time in : 25-MAR-1997 19:41:24
Entered by : L. Narayan
SPE center : MRO
Category : UNIX
OS Version :
System H/W : Alpha
Brief Description of Problem:
-----------------------------
From: SMTP%"rcy@fmslib.com" 25-MAR-1997 13:26:40.95
To: <alpha-developer@digital.com>
CC: "Dwight Manley" <manley@nicctr.enet.dec.com>
Subj: Direct I/O
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Date: Tue, 25 Mar 1997 10:24:48 -0800
To: <alpha-developer@digital.com>
From: Ron Young <rcy@fmslib.com>
Subject: Direct I/O
Cc: "Dwight Manley" <manley@nicctr.enet.dec.com>
Mime-Version: 1.0
Content-Type: text/plain; charset="us-ascii"
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?
Do any of the open flags O_SYNC or O_DSYNC perform direct I/O.
Thanks, Ron Young
+---------------------------------+----------------------------------+
| Ron Young | Phone: (702) 831-4400 |
| Multipath Corporation | FAX: (702) 831-4401 |
| P.O. Box 8210 | E-mail: rcy@fmslib.com |
| Incline Village, NV 89452-8210 | See Multipath's home page at |
| U.S.A. | http://www.fmslib.com |
+---------------------------------+----------------------------------+
| T.R | Title | User | Personal
Name | Date | Lines |
|---|
| 3398.1 | closed | HYDRA::LNARAYAN | | Mon Apr 14 1997 13:05 | 3 |
| This feature is going to be avaliable in the Steel version of
Digital UNIX.
|