Re: [Rd] Linking With External Lapack: Segfault

From: Imanpreet <imanpreet_at_gmail.com>
Date: Mon, 25 Aug 2008 17:08:30 +0530

Hello Brian,

          The following output was when I run .configure with no option. When I run it with --with-lapack = " *-L/usr/lib -llapack" *option the following is the output of the "echos" towards the EOF

use_lapack is unset
with lapack is *-L/usr/lib -llapack #Only change. *Use_External_lapack_true #
Lapack_libs -L$(R_HOME)/lib$(R_ARCH) -lRlapack* # this is still the same.*

Any possible pointers or cause for the above ?

Regards,

On Mon, Aug 25, 2008 at 5:00 PM, Imanpreet <imanpreet_at_gmail.com> wrote:

>
> Hello Brian,
>
> I have been trying several options to configure and providing
> "-lcblas" was just one of them. I added echos for the following variable
> towards the configure. And with all of them I am getting the following
>
>
> use_lapack is unset
> with lapack is *<NIL>*
> Use_External_lapack_true #
> Lapack_libs -L$(R_HOME)/lib$(R_ARCH) -lRlapack
>
> I tried to overwrite the libRlapack.so in $(R_HOME)/lib and lapack.so in
> $(R_HOME)/modules/ both before and after doing make, *again, *but in
> either case I am getting the same SIGSEGV as mentioned earlier.
>
> FYI, we are using an in house developed lapack for our specific platform.
> Could there be any specific issues in using the same?
>
>
> Regards,
>
> Imanpreet Singh Arora
>
>
> On Fri, Aug 22, 2008 at 8:39 PM, Prof Brian Ripley <ripley_at_stats.ox.ac.uk>wrote:
>
>> On Fri, 22 Aug 2008, Imanpreet wrote:
>>
>> Hello All,
>>>
>>> I have been trying to figure out on linking R with an external
>>> lapack. Even though the R-admin recommends against doing so, our
>>> requirements force us to link it to an external lapack. I am running
>>> configure with the following parameter.
>>>
>>> *./configure --with-lapack="-L/usr/lib -llapack -lcblas" *
>>>
>>>
>>> The above seems to be having NO effect. However, later I tried replacing
>>> libRlapack, libblas and lapack.so from $(R_HOME)/lib and
>>> $(R_HOME)/modules/
>>> with external lapack. Firstly, is this good?
>>>
>>
>> No, and the cause of your failure below.
>>
>> Why do you think '-lcblas' is correct? Please do follow the manual -- if
>> you still have trouble when you do it is reasonable to ask for help, but not
>> otherwise.
>>
>> Secondly, after doing the above. When I do.
>>>
>>> When I do
>>>
>>>> example(svd)
>>>>
>>>
>>> The following is the error that I am getting:
>>>
>>> *Error: segfault from C stack overflow*
>>>
>>> On debugging the error was in La_Init() at Line 61
>>>
>>> *if(!ptr->svd)*
>>>
>>> I am getting a SIGSEGV over here.
>>>
>>> Could anybody provide an pointers or and tips on how to link R with an
>>> external lapack? And also possibly the cause of the above issues?
>>>
>>
>> Follow the manual -- its instructions do work (they are used on Mac OS X,
>> and will also work on Linux and Solaris).
>>
>>
>>>
>>> TIA.
>>>
>>> Regards,
>>>
>>>
>>> --
>>> Imanpreet Singh Arora
>>>
>>> [[alternative HTML version deleted]]
>>>
>>> ______________________________________________
>>> R-devel_at_r-project.org mailing list
>>> https://stat.ethz.ch/mailman/listinfo/r-devel
>>>
>>>
>> --
>> Brian D. Ripley, ripley_at_stats.ox.ac.uk
>> Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/<http://www.stats.ox.ac.uk/%7Eripley/>
>> University of Oxford, Tel: +44 1865 272861 (self)
>> 1 South Parks Road, +44 1865 272866 (PA)
>> Oxford OX1 3TG, UK Fax: +44 1865 272595
>>
>
>
>
> Regards,
>
> Imanpreet Singh Arora
> IBM - System And Technology Group.
>

-- 
Imanpreet Singh Arora
IBM - System and Technology Group

	[[alternative HTML version deleted]]

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