[MPICH] Problems w/ MPICH2 on Windows+Cygwin

[David Ashton]

cygwin provides a tool called objdump.  You can execute "objdump -p
myapp.exe" and it will give you the dlls imported by myapp.exe

-David Ashton

-----Original Message-----
From: owner-mpich-discuss at mcs.anl.gov
[mailto:owner-mpich-discuss at mcs.anl.gov] On Behalf Of
justinsea at optonline.net
Sent: Monday, July 18, 2005 11:34 AM
To: David Ashton
Cc: mpich-discuss at mcs.anl.gov
Subject: Re: RE: [MPICH] Problems w/ MPICH2 on Windows+Cygwin

Thank you for your help, David.

Do you know if there's a way to figure out what .dll is missing when I get
exit code 128? Cygwin has many  many dll directories.

Thanks!

----- Original Message -----
From: David Ashton <ashton at mcs.anl.gov>
Date: Friday, July 15, 2005 7:18 pm
Subject: RE: [MPICH] Problems w/ MPICH2 on Windows+Cygwin

> 1) Exit code 128 means that a dll was missing.  In this case it 
> means that
> you have a dll in your path that is not in the system path.  When 
> you don't
> use -localonly the smpd process manager is used and it runs as a 
> serviceunder the system account with the system path.  You need to 
> make sure that
> all dlls that your application requires are located in the system 
> path or in
> the same location as your application.  In this case it probably 
> means the
> cygwin dlls need to be added to the system path.
> 
> 2) You can link with -lmpich2.  The lib part is assumed.  If you 
> link with
> -lmpi then you get the wrapper dll that allows you to select any 
> of the
> various channel implementations of mpich2 at run-time.  If you 
> link with
> -lmpich2 then you only get the socket channel implementation.  We 
> have seen
> problems with -mpi under cygwin.  If -lmpi does not work then use -
> lmpich2.
> -David Ashton
> 
> -----Original Message-----
> From: owner-mpich-discuss at mcs.anl.gov
> [mailto:owner-mpich-discuss at mcs.anl.gov] On Behalf Of
> justinsea at optonline.net
> Sent: Friday, July 15, 2005 2:55 PM
> To: mpich-discuss at mcs.anl.gov
> Subject: [MPICH] Problems w/ MPICH2 on Windows+Cygwin
> 
> Hello,
> 
> I am having strange problems trying to get the MPICH2 example program
> (exmaples/icpi.c) to work. I have MPICH2 1.0.2 and the latest Cygwin
> installed on a Windows XP machine. I compiled the program from a 
> DOS command
> box:
> 
> C:\MPICH2\examples>gcc -Ic:/mpich2/include -Lc:/mpich2/lib icpi.c -
> lmpi
> Then, running the program like this:
> 
> C:\MPICH2\examples>mpiexec -n 4 -exitcodes a.exe
> rank: node: exit code
> 0: %HOST%: 128
> 1: %HOST%: 128
> 2: %HOST%: 128
> 3: %HOST%: 128
> 
> However, if I added the "-localonly" option to mpiexec, it seems 
> to work
> fine.
> 
> The same problem applies to other MPI programs I tried.
> 
> On a separate note, page 21 of the MPICH2 User's Guide seems to 
> indicatethat Cygwin user should use libmpich2.a instead of 
> mpi.lib. Does anyone know
> a way to tell the link to use libmpich2.a? I have the following 
> problems,e.g.:
> 
> $ gcc -Ic:/mpich2/include -Lc:/mpich2/lib icpi.c -llibmpich2
> /usr/lib/gcc/i686-pc-cygwin/3.4.4/../../../../i686-pc-
> cygwin/bin/ld: cannot
> find -llibmpich2
> collect2: ld returned 1 exit status
> 
> Thanks in advance for any help you can provide!
> 
> 
>