Date:         Thu, 22 Jan 1998 09:41:26 -0500
Reply-To:     "Zuckier, Gerald" <Zuckier@CHIME.ORG>
Sender:       "SAS(r) Discussion" <SAS-L@UGA.CC.UGA.EDU>
From:         "Zuckier, Gerald" <Zuckier@CHIME.ORG>
Subject:      FW: Re[2]: SAS for OS/2?
Content-Type: text/plain

On my machine, under the Start/Programs menu, under
Accessories/SystemTools, exists System Monitor, which, if run, then
offers under Edit/Add Item a category called Memory Manager, which then
offers individual items including Swapfile in Use and Swapfile Size.
Using this simple technique, as well as such tools as MSINFO32
(intuitively located under c:\program files\common files\microsoft
shared\msinfo), and manually playing with swapfile max. and min sizes, I
seem to have determined that my swapfile must never be more than 50% in
use. I.e., if my swapfile is set at 60 Meg max., when the actual amount
of swapped memory hits 30 Meg, I start getting out of memory messages.
 
> ----------
> From:         John Whittington[SMTP:medisci@POWERNET.COM]
> Sent:         Wednesday, January 21, 1998 8:38 PM
> To:   SAS-L@UGA.CC.UGA.EDU
> Subject:      Re: Re[2]: SAS for OS/2?
>
> Further two my earlier comments about swapfile ('virtual memory')
> management
> in Win95, I've just been doing a little playing, with the following
> 'discoveries':
>
> 1...The Win95 sawp file is always to some extent 'dynamic'.  One can
> set up
> any values for minimum and maximum size of the swap file (within disk
> space
> limitations), but I haven't yet actually done any experiments to see
> if it
> actually does what it says it's doing - i.e. if the amount specified
> as
> 'maximum' actually becomes available to applications.
>
> 2...If one chooses the ('recommended') option to leave Win95 in total
> charge
> of swapfile management, the ('greyed ou') figures it puts into the
> boxes are
> 0 for minimum and 'no limit' for maximum.  If that means what it says,
> this
> might be promising.
>
> 3...Using that 'recommended' (dynamic) option, I observed reported
> 'swapfile
> size' and 'swapfile usage' via the System Info section in MS Word.
> With
> Word as the only application open, the swapfile size is only about 1
> MB, and
> the usage as 0%.  As one opens further applications, that figure
> rises, with
> 'usage' still remaining very low.  Typical increases on opening an
> application seem to be about 2 MB for each MS application, and 8-9 MB
> on
> opening SAS.  I have not yet been able to see the reported swapfile
> size
> changing as a result of those applications 'doing things'.
>
> It therefore looks as if each application is somehow telling Win95
> what sort
> of swap file size it wants/needs when that application is opened (even
> though little/none is actually being 'used' at that time) - but the
> actual
> swapfile sizes we are talking about are very modest.  What remains for
> me to
> discover is whether an application can actually persuade Win95 to
> increase
> the allocated swapfile size after the application has been opened.  I
> somehow suspect that the problem may be that this is not possible -
> and, if
> so, will beg the question as to whether there is some way to change
> the
> amount of swapfile allocated to a particular application (e.g. SAS) on
> opening.
>
> .. just a few thoughts for folk to ponder!!
>
> Kind Regards,
>
> John
>
> ----------------------------------------------------------------
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