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Re: Scope_Varfetch "IDL workbench" train wreck [message #68689 is a reply to message #68688] Wed, 18 November 2009 11:36 Go to previous messageGo to previous message
penteado is currently offline  penteado
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On Nov 18, 4:19 pm, wlandsman <wlands...@gmail.com> wrote:
> I recently received a note from a user saying that my procedure
> readcol.pro
> (http://idlastro.gsfc.nasa.gov/ftp/pro/misc/readcol.pro) - one of
> many such procedures to read an ASCII file into IDL variables -- was
> taking ~100 times longer to run from the IDL workbench than from the
> IDL command prompt.     I of course replied that this was complete
> nonsense, and that the interface used to call the procedure shouldn't
> affect its speed.
>
> Of course, when I tested this, a run that took under 1 second from the
> command prompt  completely hung my Mac (x86_64 darwin unix Mac OS X
> 7.1 Apr 21 2009 64 64) when run from the Workbench.     My Linux box
> was not quite as bad but also eventually hung with messages such as
>
> java.lang.OutOFMemoryError: unable to create new native thread
> java.lang.ArrayIndexOutOfBoundsException: 2601
>
> The culprit apparently is my use of SCOPE_VARFETCH.     readcol.pro
> calls SCOPE_VARFETCH thousands of time for a large file, since it
> writes data directly into the output variables, and uses a
> SCOPE_VARFETCH call for each item written.
>
> Below is a little test program to be called with
> IDL> test, x1,x2,x3,x4,x5,x6,x7,x8,x9
>
> I find it runs instantly from the IDL command line but takes very long
> or hangs the IDL workbench.    --Wayne
>
> pro test,a,b,c,d,e,f,g,h,j
>
> vv = ['a','b','c','d','e','f','g','h','j']
> for k=0,8 do begin                         ;Create output variables
>    res = execute(vv[k] + '=fltarr(5000)' )
> endfor
> for jj=0,4999 do for k=0,8 do (scope_varfetch(vv[k],Level=0))[jj]=
> float(jj)
> return
> end

Very odd. It ran in the Workbench in about the same time, but after it
is done, a lot of error messages get written to the terminal from
which I called the Workbench, and after a few seconds, the Workbench
dies with the same kind of error messages. This is with IDL 7.1 on
Fedora 11 64 bit.

I tried turning off some visualizations (I though that Debug and
Variables might be doing something to keep track of the call stack and
local scope variables, and the problem might be there), but saw no
change. I would write to ITTVIS, since this is definitely a bug.

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