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RE: st: time elapsed within 'for' loops


From   Mark Schaffer <M.E.Schaffer@hw.ac.uk>
To   statalist@hsphsun2.harvard.edu
Subject   RE: st: time elapsed within 'for' loops
Date   Sun, 14 Nov 2004 16:27:15 +0000 (GMT)

Nick/David,

Quoting Nick Cox <n.j.cox@durham.ac.uk>:

> I doubt it. -for- itself is a command. The fact 
> that it runs other commands is not reflected 
> by what the profiler reports,

reshape is an ado, and so profiler should report on how much time was spent
in reshape, no?  I think this is what David wants.  Or perhaps I missed the
point somewhere.

Cheers,
Mark

> as is explained 
> in the help Mark quotes here. 
> 
> A quite different comment is beware -for- 
> and the habit of trying to write miniature programs 
> as a single call to -for-. It is cute when it 
> works but very inefficient and all too likely to bite you. 
> 
> Nick 
> n.j.cox@durham.ac.uk 
> 
> Mark Schaffer
> 
> > Try -profiler-; it will probably do what you want.  From the 
> > help file:
> > 
> > "profiler is a programmer's command that can help in 
> > optimizing ado-files
> > and other Stata programs.  When profiling is turned on, 
> > profiler on, Stata
> > begins keeping a record of each time a program is run and how 
> > much time is
> > spent in the program."
>  
> David K Evans
>  
> > > Is there a simple way to see how much time has elapsed while a
> > > command in the midst of a "for" loop is running?
> > > 
> > > Outside of a loop, I just "set rmsg on" and can see how long
> each
> > > command takes.
> > > 
> > > But if I have, for example,
> > > 
> > > for num 1/10: preserve \ keep if age==X \ reshape [blah blah
> blah]
> > > \
> > > save ageX.dta, replace \ restore;
> > > 
> > > and I want to know how long the reshaping took, I'm not sure how
> to
> > > find out. "set rmsg on" only gives me the time for the entire
> loop.
> > > 
> > > I know about macros to display the time, but I'm not sure how
> to
> > > manipulate them to calculate time elapsed.
> 
> *
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> 



Prof. Mark Schaffer
Director, CERT
Department of Economics
School of Management & Languages
Heriot-Watt University, Edinburgh EH14 4AS
tel +44-131-451-3494 / fax +44-131-451-3008
email: m.e.schaffer@hw.ac.uk
web: http://www.sml.hw.ac.uk/ecomes
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