Statalist


[Date Prev][Date Next][Thread Prev][Thread Next][Date index][Thread index]

Re: st: dofile tripping over itself


From   "Radu Ban" <raduban@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: dofile tripping over itself
Date   Tue, 22 Apr 2008 00:43:33 +0100

Aside from this problem, it's not good practice to -save, replace-
over the original file. Especially if you want to run this do file
more than once.

Best,
Radu

2008/4/22, Sergiy Radyakin <serjradyakin@gmail.com>:
> Here is a demonstration illustrating ~2048 files limit (Windows):
>
> // ----------------------------------------------------------
> set more off
> forval i=1/2050 {
>  tempname file`i'
>  display "Opening file `i'"
>  file open `file`i'' using c:\temp\delme`i', write text replace
> }
> file close _all
> // ----------------------------------------------------------
>
> After several runs, I am getting ~2045 as the failure value (2044
> successful open files). Since the .do file remains open while running,
> this brings the total open files to 2045 (if I run the loop from the
> Stata's prompt, I get precisely one more open file),  plus
> Stata-executable remains opened during the whole session, so total
> reaches 2046. There is one more file created in the Windows\Temp\
> directory for each Stata session (STXXXX), so we have 2047 opened
> files. Does Stata open anything else? (to bring the total to declared
> 2048) Note that all commands in the benchmark are built-in, so no .ado
> files remain open during execution.
>
> Could somebody please try it on other OSes and say how many files can
> be simultaneousely opened by Stata there?
>
> Best regards,
>   Sergiy Radyakin
>
>
> On 4/21/08, Sergiy Radyakin <serjradyakin@gmail.com> wrote:
> > Dear Dan,
> >
> > one of the possible explanations could be that you are opening a file
> > for output ("file open ....") and don't close it within iterations.
> > Than Stata will ultimately run out of handlers (perhaps somebody from
> > the Stata, Corp could tell more precisely how many files can be opened
> > simultaneously).
> >
> > The following article from the M$ knowledgebase gives some support and
> > an approximate value of how big (small) this limit can be depending on
> > the version of OS: http://support.microsoft.com/kb/163202
> > Though they mention quite old OSes, there probably is a limit in the
> > new ones too. There could also be a limit imposed by the compiler,
> > used to compile Stata. Microsoft's compiler has it's restrictions
> > described here:
> > http://msdn2.microsoft.com/en-us/library/6e3b887c(VS.80).aspx
> >
> > ************* Quote *****************************************
> > Up to 2,048 files can be open simultaneously at the lowio level (that
> > is, opened and accessed by means of the _open, _read, _write, and so
> > forth family of I/O functions). Up to 512 files can be open
> > simultaneously at the stdio level (that is, opened and accessed by
> > means of the fopen, fgetc, fputc, and so forth family of functions).
> > The limit of 512 open files at the stdio level can be increased to a
> > maximum of 2,048 by means of the _setmaxstdio function.
> >
> > Because stdio-level functions, such as fopen, are built on top of the
> > lowio functions, the maximum of 2,048 is a hard upper limit for the
> > number of simultaneously open files accessed through the C run-time
> > library.
> >
> > ************* End of quote *****************************************
> >
> > Hope this helps,
> >   Sergiy Radyakin
> >
> >
> >
> >
> > On 4/21/08, Dan Weitzenfeld <dan.weitzenfeld@emsense.com> wrote:
> > > Hi Folks,
> > > I'm working on a dofile that loops through a process thousands of
> > > times.  Part of that process includes the following:
> > >
> > > ----begin code
> > >
> > >        use "$directory/REACH_RESULTS.dta", clear
> > > * random stuff
> > >        save "$directory/REACH_RESULTS.dta", replace
> > >
> > > ----end code
> > >
> > > I am repeatedly getting the following error
> > >
> > > file C:\Documents and Settings\Dan
> > > Weitzenfeld\Desktop\REACH_RESULTS.dta could not be opened
> > > r(603);
> > >
> > > ...but when this error occurs, Stata has that very file open!
> > > Moreover, the error is occuring at seemingly random times.  That is,
> > > sometimes it will occur on the 124th run through the loop, while
> > > others it won't occur until the 865th run through the loop.
> > > I have had similarly random errors with a different
> > > computationally-intensive do file.  It's as if Stata starts going so
> > > fast it trips over itself.
> > > Having done a good deal of coding, I am well aware of how suspicious
> > > "randomly occurring error" sounds.  But trust me, I am changing
> > > nothing in the do file, there is no randomness within the file, but
> > > the error occurs at random loop iterations.
> > > I am using Stata 10 on a Windows XP Professional SP2 on a Dell
> > > Dimension DXP061 Core2, 6600@2.40HHz, 2GB ram
> > >
> > > Has anyone else had this problem?
> > >
> > > Thanks in advance,
> > > Dan
> > > *
> > > *   For searches and help try:
> > > *   http://www.stata.com/support/faqs/res/findit.html
> > > *   http://www.stata.com/support/statalist/faq
> > > *   http://www.ats.ucla.edu/stat/stata/
> > >
> >
> *
> *   For searches and help try:
> *   http://www.stata.com/support/faqs/res/findit.html
> *   http://www.stata.com/support/statalist/faq
> *   http://www.ats.ucla.edu/stat/stata/
>


-- 
picasaweb.google.com/raduban
*
*   For searches and help try:
*   http://www.stata.com/support/faqs/res/findit.html
*   http://www.stata.com/support/statalist/faq
*   http://www.ats.ucla.edu/stat/stata/



© Copyright 1996–2014 StataCorp LP   |   Terms of use   |   Privacy   |   Contact us   |   What's new   |   Site index