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st: RE: Re: OS memory availability


From   "Nick Cox" <n.j.cox@durham.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: Re: OS memory availability
Date   Tue, 30 Mar 2004 23:17:50 +0100

I built a bit on Kevin's useful idea. 
If you don't see the downside of this 
program, don't use it. If you want to 
build on it, feel free. 

program systeminfo 
	version 8 
	tempfile file 
	preserve 
	clear 
	shell systeminfo /FO CSV > `file' 
	qui insheet using `"`file'"', comma 
	
	foreach v of var * { 
		di as txt `v'[1] ": " `v'[2] 
	}	
end 	


Nick 
n.j.cox@durham.ac.uk 

> -----Original Message-----
> From: owner-statalist@hsphsun2.harvard.edu
> [mailto:owner-statalist@hsphsun2.harvard.edu]On Behalf Of Kevin Turner
> Sent: 30 March 2004 22:40
> To: statalist@hsphsun2.harvard.edu
> Subject: st: Re: OS memory availability
> 
> 
> Fred Wolfe <fwolfe@arthritis-research.org> writes:
> 
> >Thanks for the comments. I wrote the following program to 
> try to get at the 
> >issue. It reports back the level of memory that does not get 
> an "op. sys. 
> >refuses to provide memory" error.
> 
> Like Fred, I've placed -set mem- inside of a for loop and 
> captured the highest
> value that Stata can successfully allocate. I don't know if 
> there is a way to
> obtain the highest value apart from experimentation because 
> the value is
> not guaranteed to be constant over time. The reason for this 
> is that, on 
> Windows, it represents the largest _continuous_ free block of 
> memory. As
> programs request and free up portions of memory, this space 
> can potentially
> change in size.
> 
> However, if you want to dynamically find the amount of 
> physical memory (like
> David was asking) you can get this value using a DOS command. 
> 
> From Stata:
> 
> . shell systeminfo /FO CSV > systeminfo.csv
> . insheet using systeminfo.csv, comma
> 
> This imports a dataset with various system specifications. The first 
> observation contains all the variable names and the second 
> observation contains
> their values. Get the values you want and then clear the dataset. 
> 
> To prevent thrashing of virtual memory, stay at or below the 
> value in v23 and
> make sure that Stata is not competing for memory resources 
> with another 
> running program.
> 
> . list v23 in 2
> 
> Hope this helps,
> 
> --Kevin
> kturner@stata.com
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