[Beowulf] segmentation fault error for large program on beowulf cluster using intel Fortran compiler
Reuti
reuti at staff.uni-marburg.de
Fri Jun 17 13:28:24 PDT 2005
Antonio,
for which platform do you want to compile, as I see "-axN -xN".
1. Don't use them, as -tpp7 will optimze already for P4.
2. Try using (only one time) -O0, don't specify it twice.
3. Replace "-ftz -prec_div" with "-mp"
4. If this is working, you can try to use one of "-axN" or "-xN" and check,
whether there is any speed impact at all.
Cheers - Reuti
Quoting Antonio Parodi <antonio at cima.unige.it>:
>
> Hi,
> I am trying to compile a large code on Beowulf cluster using the intel
> fortran compiler 8.1.024 and I am experiencing a problem with stack size
> management since when I try to start the code , it immediately crashes with a
> segmentation fault in spite of my system having 2 GB RAM.
> The compiler options adopted in my makefile are the following
>
> OPT = -I. -O3 -unroll16 -scalar_rep -nowarn -O3 -tpp7 -axN -xN -ftz
> -prec_div -rcd -us -g -debug -check all
>
> LDFLG = -L/opt/intel/lib -Vaxlib -lm -static -static-libcxa
>
> vpp5exe: addmods / $(DATAOBJ) $(PUBLICUTILS) $(UTILOBJ) $(EXTOBJ) $(SRCOBJ)
> echo linking parallel program
> ( $(LDPAR) $(LDFLG) -o lmparbin $(DATAOBJ) $(UTILOBJ) $(EXTOBJ)
> \
> $(PUBLICUTILS) $(SRCOBJ) $(LIB) )
>
> > the intel release_notes I knew that one of know limitations of the fortran
> compiler is to create segmentation violation with static link to libpthreads
> or similars, but I do not know to exploit this information.
> I have used different compiler options, but I cannot find out why the
> executable cannot work: no debugging switches help. I cannot understand if
> it's a compiler or system problem.
> I just know that at smaller size, the program works without problems. For
> bigger size problems, I try to use ulimit s S unlimited but it does not help
> anymore.
> I hope that someone can help me.
> Thank you
> Antonio
>
>
> --
> ****************************************************************
> Ing. ANTONIO PARODI Ph.D
> Universita' di Genova
> CIMA Centro di Ricerca Interuniversitario in Monitoraggio Ambientale
> Via Cadorna, 7 17100 Savona Italy
> Phone: +39 1923027218 Fax: +39 19862612
> mailto:antonio at cima.unige.it http://www.cima.unige.it
>
> *****************************************************************
>
>
> --
>
>
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