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Re: Fortran libraries on the Blue Gene with mpi
From: |
Ralf Wildenhues |
Subject: |
Re: Fortran libraries on the Blue Gene with mpi |
Date: |
Sat, 18 Apr 2009 18:48:05 +0200 |
User-agent: |
Mutt/1.5.18 (2008-05-17) |
Hi John,
* John R. Cary wrote on Thu, Apr 16, 2009 at 11:13:54PM CEST:
> Ralf Wildenhues wrote:
>> OK. That's fairly easy to support in Libtool then: the only thing we
>> need to get right is to turn off shared library support completely for
>> BG/L.
>
> I gave the wrong impression. This is a BG/P. My previous reference to the
> compilers was because the BG/L compilers (I thought) are the same.
That's fine; I understood you correctly.
>> Can we assume bg* produces code for the compute nodes only? Let's turn
>> the question around: how can we reliably detect that code is being
>> compiled for the compute nodes?
> I don't know for sure, but the experiments at the end of this indicate that
> bg compiled code works on the login nodes.
That's good to know.
> login5.intrepid$ ./config.guess
> ./config.guess: unable to guess system type
[...]
> config.guess timestamp = 2009-02-03
>
> uname -m = 4400
> uname -r = 4.0
> uname -s = iainfo2
> uname -v = 3.0
> /bin/arch = ppc64
> UNAME_MACHINE = 4400
> UNAME_RELEASE = 4.0
> UNAME_SYSTEM = iainfo2
> UNAME_VERSION = 3.0
This looks pretty weird, as if the system hasn't fully been set up yet.
Where does that "iainfo2" name come from?
>> I am unsure whether -dy/-dynamic/-qnostaticlink is the default mode of
>> operation. Can you find this out for me, for both compiler suites?
Thanks for the experiments. Results:
- xlc links shared even without -qnostaticlink,
- bgxlc requires -qnostaticlink in order to link shared.
- both understand -R and -Wl,-rpath which is good.
Now can you try, for both xlc and bgxlc, whether a static library will
be accepted even with -qnostaticlink? I.e., whether -qnostaticlink only
is "prefer shared libraries over static ones" or "require shared
libraries, reject static ones"?
bgxlc -c foo.c
ar cru libfoo.a foo.o
bgxlc -c main.c
bgxlc -o main main.o -qnostaticlink -L. -lfoo
./main
bgxlc -o main main.o -L. -lfoo
./main
Thanks,
Ralf
- Fortran libraries on the Blue Gene with mpi, John R. Cary, 2009/04/13
- Re: Fortran libraries on the Blue Gene with mpi, Ralf Wildenhues, 2009/04/14
- Re: Fortran libraries on the Blue Gene with mpi, John R. Cary, 2009/04/16
- Re: Fortran libraries on the Blue Gene with mpi, Christian Rössel, 2009/04/17
- Re: Fortran libraries on the Blue Gene with mpi,
Ralf Wildenhues <=
- Re: Fortran libraries on the Blue Gene with mpi, John R. Cary, 2009/04/18
- Re: Fortran libraries on the Blue Gene with mpi, Ralf Wildenhues, 2009/04/19