This may not be a proper question to ask here, however I don't find a better
place to ask.
I am testing Ubuntu Natty 11.04. I build R with Blas/Lapack linked to intel MKL.
Everything works fine but when quitting R with q(), the R process won't
quit, and the system monitor shows its waiting channel as futex_wait_queue_me.
For example, with "make check", the process will halted after checking
the graphics package, whose test script called lm(), which I think used lapack
routines in MKL.
The next thing I tried is using environmental variables such that MKL runs in
sequential mode. Then everything goes perfect. "make check"
was?successful.
So I identified that the problem is with the?multi-threaded?version of MKL.
After some trials, I think it is true, as eigen(), inv(), and matrix
multiplication, etc all cause the same problem. The computing itself is fine,
but R is halted when quiting.
Then I wrote some C code using blas/lapack to test, and there's no problem
with MKL, at least with my testing code.
Both R-2.13 and R-2.12 are tried. Both intel icc and gcc, ifort and gfortran are
tried. In sum, I tried most configuration combination of compilers, openmp
flags, etc I can think about. But the problem persist.
I think this could be a problem with ubuntu 11.04. So this as I said in the
beginning, this may not be a proper question to ask here. However, I tried
blas/lapack routines for decomposition, etc in C, and it runs without problem.
So there's may be some workaround with the problem when building R and
hopefully someone can give some hints.
Best,
Yan
