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- Newsgroups: vmsnet.internals
- Path: sparky!uunet!decwrl!pa.dec.com!datum.nyo.dec.com!nntpd.lkg.dec.com!narfvx.enet.dec.com!francini
- From: francini@narfvx.enet.dec.com (John Francini)
- Subject: Re: Maximum wsmax: can it be increased ?
- Message-ID: <1992Nov22.075140.21530@nntpd.lkg.dec.com>
- Sender: usenet@nntpd.lkg.dec.com (USENET News System)
- Organization: Digital Equipment Corporation, Littleton, MA
- References: <01GRDFI4HY2A8WVZBS@MONMOUTH-etdl1.Army.MIL>
- Date: Sun, 22 Nov 1992 07:46:14 GMT
- Lines: 53
-
-
- In article <01GRDFI4HY2A8WVZBS@MONMOUTH-etdl1.Army.MIL>, "Brian J. Schenkenberger, VAXman" writes...
- >>Under VMS 5.5-2 the maximum value for wsmax is 400000 pages.
- >>[...]
- >>he can't have more than 400000 pages im memory.
- >>
- >>I'm sure some higher Version of VMS will raise this limit eventually,
- >>but 400000 seems a rather arbitrary value, so i guess this could be
- >>increased somehow.
- >>
- >>Has anybody done this ?
- >>Any ideas / pointers how to do it ?
- >
- >I've never done this but... I can offer you a quick method to change
- >the value.
- >
- >The value for WSMAX is stored at the symbolic address SGN$GL_MAXWSCNT.
- >You can change this value WHILE THE SYSTEM IS RUNNING with DELTA. How?
- >Lookup the address of SGN$GL_MAXWSCNT in SYS.MAP. Then, enter DELTA.
- >
- >$ RUN SYS$SHARE:DELTA
- >1:m <cr>
- >00000001 <cr>
- >00010001:<address of SGN$GL_MAXWSCNT>/<return-curr-value> <your-new-value>
- >EXIT (hex of course)
- >$
- >
- >>Caveats ? :-)
- >
- >This above will change the value. Its implications if you increase it
- >above the current limits? I know not! I just LOWERed my system's WSMAX
- >by 16 with the above and have had no problems.
- >
- >If you have a system you can crash... try it out and let us know.
- >BJS-
-
- Somehow I expect that it WOULD crash. There's a reason why WSMAX isn't
- dynamic -- I believe that this value is used to set up some static-sized
- data structures for each balance set slot, and that if you increase WSMAX
- willy-nilly in a running system, you're likely to scrawl all over some
- other process data structure. You'd probably be better off trying this
- little bit of POKEing at boot time, using XDELTA to change the setting
- after the parameters have been read but before the balance set slot data
- structures have been set up.
-
- Just my $0.02....
-
- John Francini
- PATHWORKS for VMS project leader
- Digital
- francini@narfvx.enet.dec.com
-
-
-