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st: RE: Displaying the time it takes to -list-


From   "Nick Winter" <nwinter@policystudies.com>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: Displaying the time it takes to -list-
Date   Tue, 25 Feb 2003 15:11:52 -0500

> -----Original Message-----
> From: Peter Jepsen [mailto:peter@nisjepsen.dk] 
> Sent: Tuesday, February 25, 2003 2:21 PM
> To: statalist@hsphsun2.harvard.edu
> Subject: st: Displaying the time it takes to -list-
> 
> 
> Nick Winter wrote:
> *****
> 	. list in 50000/50010
> 
> takes 0.01 seconds in my test database, whereas
> 
> 	. list
> 
> takes over 4 seconds to begin.
> 
> The following takes about 0.17 seconds:
> 
> 	. list if inrange(_n,20000,20035)
> 
> campared with:
> 
> 	. generage rand=uniform()
> 	. list if rand>.9999
> 
> which takes about 0.18 seconds to list in my sample dataset,
> *****
> 
> How can I make Stata 8 display the time it takes from the moment I hit
> <ENTER> after issuing a -list- command until the results are 
> displayed?
> 
> Thank you in advance.
> 
> Peter Jepsen.

I thought about this for a second before I did the tests listed above,
and decided that, in fact, I doubt you can.

What I did was 

	. set rmsg on
	. set more off

and then hit break as quickly as I could after the long listing started.
That gives a timing of how long it takes to begin displaying and then to
display however many records before I hit break.  (IE, it gives the
time-to-start-of-list plus my reaction time.  I'm highly caffeinated
today, so I think my reaction time is well under 0.5 seconds...)

I figured that gave me a clear enough sense of how long it took (and
made it clear to me that it took *much* longer to begin listing lots of
records, compared to the shorter lists.)

Nick Winter
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