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- From: fairfield@slacvx.slac.stanford.edu
- Subject: Re: MEMFUL on large arrays
- Message-ID: <1993Jan26.235037.1@slacvx.slac.stanford.edu>
- Lines: 62
- Sender: news@unixhub.SLAC.Stanford.EDU
- Organization: Stanford Linear Accelerator Center
- References: <4582@winnie.fit.edu> <1993Jan26.155520@mccall.com>
- Distribution: usa
- Date: Wed, 27 Jan 1993 07:50:37 GMT
-
- In article <1993Jan26.155520@mccall.com>, tp@mccall.com (Terry Poot) writes:
- > In article <4582@winnie.fit.edu>, karin@zach.fit.edu (Karin Nicholson) writes:
- >>I have a friend who wants to run a program that has large arrays. He hasn't
- >>been able to get beyond linking the darn thing. His declaration section
- >>reads as follows:
- >>
- >> COMMON X(2400,2400),A1(2400,2400),A2(2400,2400),WT(5,2400),
- >> & XT(2400,2400),D(2400),XMEAN(2400),SUM(2400),SD(2400),DT(2400)
- >> CHARACTER*15 IN(12),OUT1,OUT2
- >>
- >>When he tries to link, he gets the following messages:
- >>
- >>%LINK-E-MEMFUL, insufficient virtual address space to complete this link
- >>-LINK-E-NOIMGFIL, image file not created
- >
- > I assume you know how big this is! Anyway, this happened to me a long long
- > time ago, and the answer was to raise the sysgen parameter VIRTUALPAGECNT.
- > Apparently, you need to be able to virtually address the whole image to
- ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
- > link it. You also had better check the size of your page file. This
- > program uses over 100 megabytes of virtual memory, which means you are
- > going to need a page file well over 200,000 blocks, and your virtualpagecnt
- > parameter is going to have to be upwards of 200,000 also. Read the manuals
- > to learn all the ramifications of this, do _not_ simply take my word for
- > it. This was about 10 years ago, on VMS 3.2 or something like that!
-
- You don't have to be able to virtually address the whole image. I
- know because I recently had a user come to me with the related
- problem that he could link an image, he but couldn't activate it
- because of insufficient VIRTUALPAGECNT...and see below.
-
- However, something the Terry neglected to mention is that the user's
- PGFLQUO (set via AUTHORIZE) must also be large enough to contain the
- virtual address space of the image. Thus to run your large, >200000
- page image, you'll need VIRTUALPAGECNT and PGFLQUO larger than, but
- on the order of, 200000 pages, and you'll need your PAGEFILE.SYS
- about the same size (in blocks :-).
-
- >>I'd like to know where in the grey wall I can find out more information about
- >>demand-zero compression. I have looked in a couple of places, but came up
- >>empty-handed.
- >
- > The linker manual. VIRTUALPAGECNT is in the sysgen manual, and you'll also
- > want to look at the various system management guides about sysgen
- > parameters and managing page files and virtual memory.
-
- There was an interesting thread in this group at the end of December
- under the subject "ballooning EXE size" that explored use of the
- ISD_MAX linker option to increase the allowed number of demand-zero
- image sections. You may want to retrieve these items from an
- INFO-VAX archive near you. But I found Steve Lionel's suggestion to
- use the COLLECT linker option the most interesting. I've saved a
- copy that I can forward if you like to see it (won't solve your
- problem).
-
- -Ken
- --
- Dr. Kenneth H. Fairfield | Internet: Fairfield@Slac.Stanford.Edu
- SLAC, P.O.Box 4349, MS 98 | DECnet: 45537::FAIRFIELD (45537=SLACVX)
- Stanford, CA 94309 | BITNET Fairfield@Slacvx
- ----------------------------------------------------------------------------
- These opinions are mine, not SLAC's, Stanford's, nor the DOE's...
-