Hi,
On my Windows XP [fully up to date, legal IC Stata 11 :-) ], the
following consumes 30-50% of my system CPU time, according to the
Windows Task Manager:
while 1 {
sleep 500
}
Whereas this consumes essentially 0 CPU time:
while 1 {
sleep 501
}
(On one computer the first loop consumes 50%, i.e. the total that Stata
can use on my Dual Core processor; on a different computer it takes
"only" 30-ish percent. But on both systems there's a sharp drop to
essentially nothing in the second loop.
Any ideas why?
An aside on why I care:
I'm writing a program in which Stata calls an external program and waits
for it to finish before continuing. I'd like to handle this with
-winexec- followed by watching for the creation of a file by the
external program to signal that it's done, rather than using 'shell' to
make Stata wait, because I want Stata to spawn several of these
processes and then wait for them *all* to finish.
So my strategy is to do something like this:
winexec "c:\usrdata\autoit\sttest.exe"
sleep 500
capture confirm file "c:\temp\xxx.txt"
while _rc {
sleep 500
capture confirm file "c:\temp\xxx.txt"
}
di "done!!!"
- Nick Winter
--
--------------------------------------------------------------
Nicholas Winter 434.924.6994 t
Assistant Professor 434.924.3359 f
Department of Politics [email protected] e
University of Virginia faculty.virginia.edu/nwinter w
PO Box 400787, 100 Cabell Hall
Charlottesville, VA 22904
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