Re: Amount of memory saved by INSTALL-ing ?
- From: Bob Gezelter <gezelter@xxxxxxxxx>
- Date: Sun, 8 Feb 2009 04:39:21 -0800 (PST)
On Feb 8, 12:22 am, "Richard B. Gilbert" <rgilber...@xxxxxxxxxxx>
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!
Richard,
Amen. I do not want to count the times that I was able to save
clients significant funds by INSTALLing actively used images and
similar improvements in resource utilization. The remark that "It is
amazing what could be done with a VAX-11/750, tuned correctly" is all
too true.
The lesson is no less applicable today. The systems are far more
capable, but the demands on them have in many cases grown even larger.
My standard recommendation to clients (and potential clients) is that
a good tuning review done BEFORE deciding on a hardware upgrade, even
in many cases, memory upgrades, is a sound choice. I have seen
purchases of GS-class systems to resolve "performance problems" that
could have been solved by a performance review. When performance did
not improve with the new hardware, the belated performance review
resolved the problem, and reduced system utilization to less than 10%.
- Bob Gezelter, http://www.rlgsc.com
.
- Follow-Ups:
- Re: Amount of memory saved by INSTALL-ing ?
- From: Richard B. Gilbert
- Re: Amount of memory saved by INSTALL-ing ?
- References:
- Amount of memory saved by INSTALL-ing ?
- From: Jan-Erik Söderholm
- Re: Amount of memory saved by INSTALL-ing ?
- From: Bob Gezelter
- Re: Amount of memory saved by INSTALL-ing ?
- From: Richard B. Gilbert
- Amount of memory saved by INSTALL-ing ?
- Prev by Date: Re: need packages for layered products dwmotif+decterm
- Next by Date: Re: Amount of memory saved by INSTALL-ing ?
- Previous by thread: Re: Amount of memory saved by INSTALL-ing ?
- Next by thread: Re: Amount of memory saved by INSTALL-ing ?
- Index(es):
Relevant Pages
|
Loading
