[Rd] Possible bug, Rprof() and scan(pipe()) (PR#1140)

[macq@llnl.gov]

Jan,
Here is information on the problem with Rprof() that I encountered, 
including Brian Ripley's assessment.
This is OS X 10.1 with the 10.1 developer tools installed.
-Don

At 1:00 PM +0000 11/4/01, Prof Brian Ripley wrote:
>This does not happen on Solaris or Linux, so must be related to the use of
>signals on darwin.
>
>It probably means Rprof should be avoided on that platform, but the
>porter (Jan de Leeuw) needs to investigate.
>
>
>On Tue, 23 Oct 2001 macq@llnl.gov wrote:
>
>>  This looks like a bug?
>>  Unable to use scan(pipe()) while profiling.
>>  I have no idea whether this version of R violates the
>>      "do not use `Rprof' in an executable built for profiling"
>>  warning in ?Rprof.
>>
>>  Thanks
>>  -Don
>>
>>  >  version
>>            _
>>  platform powerpc-apple-darwin1.4
>>  arch     powerpc
>>  os       darwin1.4
>>  system   powerpc, darwin1.4
>>  status   Patched
>>  major    1
>>  minor    3.1
>>  year     2001
>>  month    10
>>  day      15
>>  language R
>>  >
>  > >  foo <- scan(pipe('ls -1 | head -3'),what='')
>>  Read 3 items
>>  >  foo
>>  [1] "README"      "RMfiles.dat" "RMfiles.tmp"
>>  >  Rprof()
>>  >  foo <- scan(pipe('ls -1 | head -3'),what='')
>>  Read 0 items
>>  >  foo
>>  character(0)
>>  >  Rprof(NULL)
>  > >  foo <- scan(pipe('ls -1 | head -3'),what='')
>>  Read 3 items
>>  >
>>
>>  note, profiling does appear to be functional:
>>  >  Rprof() ; hist(rnorm(10000)) ; Rprof(NULL)
>>  >  system('R CMD Rprof Rprof.out')
>  >
>>  Each sample represents 0.02 seconds.
>>  Total run time: 0.1 seconds.
>>
>>  Total seconds: time spent in function and callees.
>>  Self seconds: time spent in function alone.
>>
>>      %       total       %       self
>>    total    seconds     self    seconds    name
>>  100.00      0.10      0.00      0.00     "hist"
>>    60.00      0.06      0.00      0.00     "hist.default"
>>    40.00      0.04     40.00      0.04     "rnorm"
>>    40.00      0.04      0.00      0.00     "plot"
>>    40.00      0.04      0.00      0.00     "plot.histogram"
>>    20.00      0.02      0.00      0.00     "storage.mode<-"
>>    20.00      0.02     20.00      0.02     "X11"
>>    20.00      0.02      0.00      0.00     "paste"
>>    20.00      0.02      0.00      0.00     "rect"
>>    20.00      0.02      0.00      0.00     "plot.new"
>>    20.00      0.02     20.00      0.02     "seq.default"
>>    20.00      0.02      0.00      0.00     "seq"
>>    20.00      0.02     20.00      0.02     "par"
>>
>>      %       self        %       total
>>    self     seconds    total    seconds    name
>>    40.00      0.04     40.00      0.04     "rnorm"
>>    20.00      0.02     20.00      0.02     "X11"
>>    20.00      0.02     20.00      0.02     "seq.default"
>>    20.00      0.02     20.00      0.02     "par"
>>
>>  --
>>  --------------------------------------
>>  Don MacQueen
>>  Environmental Protection Department
>>  Lawrence Livermore National Laboratory
>>  Livermore, CA, USA
>>  --------------------------------------
>>
>> 
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>>
>
>--
>Brian D. Ripley,                  ripley@stats.ox.ac.uk
>Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
>University of Oxford,             Tel:  +44 1865 272861 (self)
>1 South Parks Road,                     +44 1865 272860 (secr)
>Oxford OX1 3TG, UK                Fax:  +44 1865 272595


-- 
--------------------------------------
Don MacQueen
Environmental Protection Department
Lawrence Livermore National Laboratory
Livermore, CA, USA
--------------------------------------

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