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Conference star::wizards

Title:	"ASK THE WIZARDS"

Moderator:	QUARK::LIONEL

Created:	Mon Oct 30 1995
Last Modified:	Mon May 12 1997
Last Successful Update:	Fri Jun 06 1997
Number of topics:	1857
Total number of notes:	3728

1660.0. "Open: virtual pagecount obsolete?" by STAR::JKEENAN () Thu Mar 13 1997 16:05

Date: Wed, 12 Mar 1997 14:41:27 -0500
Message-Id: <[email protected]>
From: "VMS001::WWW"@vms001.das-x.dec.com (12-Mar-1997 1441)
To: [email protected], [email protected], [email protected]
Subject: Ask the Wizard: '[email protected]'

Remote Host: (null)
Browser Type: Mozilla/3.0 (WinNT; I)
Remote Info: <null>
Name: L Fordanich
Email Address: [email protected]
CPU Architecture: VAX and Alpha
Version: v 7.0
Questions: 

At Open VMS 6.1 there existed a system parameter for Virtual Pagecount as
virtualpagecnt, at O'VMS 7.0 this seems to be obsoloete,
what has replaced this at 7.0?

Thanks.

T.R	Title	User	Personal Name	Date	Lines
1660.1	Modifications to memory management made	XDELTA::HOFFMAN	Steve, OpenVMS Engineering	`Fri Mar 14 1997 17:22`	16
	:At Open VMS 6.1 there existed a system parameter for Virtual Pagecount as :virtualpagecnt, at O'VMS 7.0 this seems to be obsoloete, :what has replaced this at 7.0? Sixty-four bit virtual addressing, and associated changes to the memory management, have effectively rendered the VIRTUALPAGECNT parameter unnecessary under OpenVMS Alpha V7.0 and later. The VIRTUALPAGECNT parameter was used to control the maximum size of the page tables under OpenVMS Alpha releases prior to V7.0, and it continues to control the maximum size of the page tables under OpenVMS VAX. The SYSGEN parameter remains present in V7.0 and later, but defaults to a uniquely large value: -1.
1660.2		EVMS::KUEHNEL	Andy K�hnel	`Tue Mar 18 1997 10:17`	7
	> The SYSGEN parameter remains present in V7.0 and later, but defaults > to a uniquely large value: -1. Almost. The default is 2^31-1 which is the larges positive thing you can express in 32 bits. -1 made too many applications try to increase it...