Re: Amount of memory saved by INSTALL-ing ?

Jan-Erik Söderholm wrote:
Richard B. Gilbert wrote:
Bob Gezelter wrote:
On Feb 7, 8:47 am, Jan-Erik Söderholm <jan-erik.soderh...@xxxxxxxxx>
wrote:
Hi.
Now, let me see if I've understood this correctly...

I have a system where I can see that there are many
images used that are not installed. That is, they are
listed separately using SH DEV /FILE and so is using
a local copy of the image per process (right ?)

The questions is about how much memeory will be "saved" when
installing images. Let me take one example :

>$ install list pythonshr /full /global
>
>DISK$JFPPY0012:<PYTHON252.VMS.LIB>.EXE
> pythonshr;1 Open Hdr Shared Lnkbl
> Entry access count = 589
> Current / Maximum shared = 1 / 2
> Global section count = 2
>
> Owner: [SYSTEM]
> Protection: S:RWED,O:RWED,G:RWED,W:RE
>
>
> System Global Sections
>
>$1$LDA2:<PYTHON252.VMS.LIB>pythonshr.EXE
> INS$82FBC750_004(05000002) PRM SYS Pgltcnt/Refcnt=5113/0
> INS$82FBC750_003(05000002) PRM SYS Pgltcnt/Refcnt=1625/0
> Owner: [HTTP_SERVER]
> Protection: S:RWE,O:RWE,G:R,W:R

Is it correct that "Pgltcnt" is the size of the global/common
areas that will be reused for each additional process efter
the first one ?

Is so, is there some way to get this info (apart from
installing each image and use inst/full/global) ?
Some variant of analyze/image maybe ?

I've been searching the docs but could not come up with
something clear enough for me... :-)

Some examples of the images I'm looking at are :

TCPIP$LPD_SMB (59 processes)
GBLEFSHARE (90 processes)
DCPS$SMB (12 and growing...)
SMBSRVSHR (89 processes)
EPC$MSG (67 processes)

This is without the 100+ users logged on
on a normal workday...

VMS 8.2 DS20e 4 GB (if it matters).

Best Regards,
Jan-Erik.

Jan-Erik,

It takes some pencil-and-paper work, but the information can be
obtained from EITHER the LINKER-produced MAP file or from the output
of ANALYZE/IMAGE.

The precise details are (if I recall correctly) described in IDSM.

Basically, the shared portions are the read-only code and read-only
data,

With 100+ users using processes, even modest savings can have a
substantial impact, a fact that I noted in a presentation first given
for the local DECUS group at Goddard Space Flight Center.


Very true! I once had a system with about 300 interactive users in a call center and there was this little program that was run five or six THOUSAND times per day.

I did the obvious thing and installed it, memory resident! I can't imagine why this did not occur to any of my predecessors!



OK, I think I've "got it" now... :-)

Over the years I noticed that many startup COM files for
different products often has some commented INSTALL command
and a notice saying "uncomment these if you have many users"
or something like that. Seems reasonable, of course.

But then I'm get a little unsure when a product like DCPS
do not have any INSTALL's for it's symbiont. Is it becuse
it doesn't matter for that particular EXE ? Or was it just
forgotten about ? It can't be uncommon to have a lot of
queues all running a local copy of DCPS$SMB.EXE. Yes,
mutiple queues can share a DCPS symbiont, but anyway...

Anyway, if there isn't any particular drawback with
installing images, I'l just install them and see what
happens...

Thanks !
Jan-Erik.

Each program installed consumes some resources. ISTR that the System Managers Manual and the Performance Tuning manual go into some detail.

ONLY the executable code and constants can be shared; data needs private storage.
.

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