[Rd] Arithmetic Error while compiling R with the Intel compilers
murdoch.duncan at gmail.com
Mon Dec 2 20:12:11 CET 2013
On 02/12/2013 1:39 PM, Swapnil Gaikwad wrote:
> Hi Team,
> I downloaded the R 3.0.2 and, built and installed it
> using Intel compilers (icc and ifort) from Intel parallel studio 2013,
> sp1. After performing make tried to check it using 'make check'. Most of
> the tests passed successfully but while checking a 'stats' package I saw
> many lines were printed which did not match the desired output.
> There were two types of mismatch
> Case 1)
> < Grand Mean: 291.5937
> > Grand Mean: 291.5938
> Case 2)
> < UrbanPop *0.278* -0.873 -0.378 0.134
> > UrbanPop *-0.278* -0.873 -0.378 0.134
> Case 1 was having slight difference in the values and
> assumed due to the floating point error, but Case 2 is having values
> with difference signs. Is such behaviour is normal or there is any issue
> with the Intel libraries.
You need to look at the context of what is being tested. In this
particular case, you are testing principal component loadings: they can
all be multiplied by -1 and give exactly the same results, so this one
is okay. (The choice of sign is probably being made in the linear
> I used some of the libraries from Intel MKL
> like fftw, mkl_lapack etc. I am pasting below the command that I used to
> configure this R package.
> ./configure --prefix=$INSTALL_DIR --with-blas="-lmkl_intel_lp64
> -lmkl_intel_thread -lmkl_lapack -lmkl_core -lpthread -lfftw3xf_intel
> -lfftw3xc_intel" --with-lapack
> I also tried installing using Intel compilers without using
> Intel MKL libraries. It was done using below command.
> ./configure --prefix=$INSTALL_DIR
> Exactly same errors were there.
> There were no mismatch observed while compiling with gcc.Kindly
> provide your suggestions whether it is good idea to use Intel compilers.
> Thanks for your kind attention and time.
Can't help you with your final question, I have no experience with them.
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