Re: [Sbcl-devel] SBCL crashed when using multithreaded version of Intel MKL

[HUANG, J. <hu...@ms...>]

Hi Gábor,

I found QSHOW_SIGNALS and howto in BUGS. 


On Tue, 19 May 2009 15:57:01 +0200
Gábor Melis <me...@re...> wrote:

> On Martes 19 Mayo 2009, HUANG, Jianshi wrote:
> > Hi Mark,
> >
> > I've tried your method, it works great! Thanks.
> >
> > The only problem I found now is that if the program is interrupted
> > when it's in the foreign code, sometimes it may crash SBCL (1.0.28.47
> > Linux 64bit).
> >
> > I'm currently wrapping all the foreign funcalls to MKL functions with
> > sb-sys:without-interrupts. So far so good.
> >
> > I'll run some test during the night.
> >
> >
> > Thanks,
> > Jianshi
> 
> So almost everyone is happy. Without-interrupts should not matter, 
> though. I'm interested in how it fails, ldb, --lose-on-corruption, gdb, 
> QSHOW_SIGNALS are your friends, see BUGS for a short how to.
> 
> Also, it's less than clear how/why the workaround below solves the 
> problem.
> 
> > On Fri, 15 May 2009 10:30:21 +1000
> >
> > Mark Cox <mar...@gm...> wrote:
> > > Hi,
> > >
> > > I use MKL (and IPP) in my work as well and have experienced the
> > > same sort of thing as you. At first I just switched to the
> > > sequential (unthreaded) version of MKL due to time constraints and
> > > the problem went away. Recently I gave it another go and got it to
> > > work.
> > >
> > > I created another dynamic library which links to the intel MKL
> > > library using the following:
> > > 64bit version
> > > gcc -shared -fPIC $(CFLAGS) -o mylib.so $(SOURCES) \
> > >                  $(MKL_INCLUDES) \
> > >                  -L$(MKL_ROOT_LIBS)/em64t \
> > > 		-lmkl_gf_lp64 -lmkl_gnu_thread -lmkl_core -lm -lgomp -lgfortran -
> > > lpthread
> > >
> > > 32bit version
> > > gcc -m32 -shared -fPIC $(CFLAGS) -o mylib.so $(SOURCES) \
> > >                  $(MKL_INCLUDES) \
> > >                  -L$(MKL_ROOT_LIBS)/32 \
> > >                  -lmkl_gf -lmkl_gnu_thread -lmkl_core -lm -lgomp -
> > > lgfortran -lpthread
> > >
> > > and then loaded that shared library via cffi.
> > >
> > > My system uses sbcl 1.0.25 pulled from the sbcl website and fedora
> > > 9.
> > >
> > > Mark
> > >
> > > On 14/05/2009, at 7:18 PM, HUANG, Jianshi wrote:
> > > > Hello,
> > > >
> > > > Is there anyone succeeded in using the multithreaded version of
> > > > Intel MKL in SBCL? It crashed my lisp (segfault). I'm using SBCL
> > > > 1.0.28.22 x86_64 on Linux.
> > > >
> > > > I tried to debug using gdb but was unable to finish the program
> > > > since too many SIGSEGVs were signaled and didn't seems to stop.
> > > > So I have no idea why it crashed yet.
> > > >
> > > > The source code for testing is attached with the email, but you
> > > > need to
> > > > install Intel MKL first (and run the mklvarsem64t.sh script to
> > > > establish the environment).
> > > >
> > > > The multithreaded version of Intel MKL depends on Linux's pthread
> > > > for their openmp implementation. And I'm currently loading the
> > > > libmkl_gnu_thread.so for the threading layer, as according to the
> > > > documents this is the one that supports gnu compilers.
> > > >
> > > > It will be very helpful if someone can give me some advice.
> > > >
> > > >
> > > >
> > > > Cheers,
> > > > Jianshi
> 


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