valgrind-users

[Valgrind-users] valgrind and MPI wrappers

[Andrew T B. <And...@Co...>]

I'm trying to use Valgrind to debug an MPI program.  The user manual gives some instructions (section 2.16) and I follow them, and it says that if things are working I should get notices like this when I run my program:

valgrind MPI wrappers 31901: Active for pid 31901
valgrind MPI wrappers 31901: Try MPIWRAP_DEBUG=help for possible options

I do not get such notices, and Valgrind seems to be giving me lots of false positives from the MPI libraries.  The configure script for Valgrind reports that it finds a usable mpicc.

What am I missing?  Thanks for any help.

Re: [Valgrind-users] valgrind and MPI wrappers

[Julian S. <js...@ac...>]

- Did it successfully build $prefix/lib/valgrind/<platform>/libmpiwrap.so ?

- Did you point LD_PRELOAD at it ?

- Is your executable statically linked?

J

On Friday 04 May 2007 15:59, Andrew T Barker wrote:
> I'm trying to use Valgrind to debug an MPI program.  The user manual gives
> some instructions (section 2.16) and I follow them, and it says that if
> things are working I should get notices like this when I run my program:
>
> valgrind MPI wrappers 31901: Active for pid 31901
> valgrind MPI wrappers 31901: Try MPIWRAP_DEBUG=help for possible options
>
> I do not get such notices, and Valgrind seems to be giving me lots of false
> positives from the MPI libraries.  The configure script for Valgrind
> reports that it finds a usable mpicc.
>
> What am I missing?  Thanks for any help.
>
> -------------------------------------------------------------------------
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Re: [Valgrind-users] valgrind and MPI wrappers

[Seán <sea...@gm...>]

Bugzilla from js...@ac... wrote:
> 
> 
> - Did it successfully build $prefix/lib/valgrind/<platform>/libmpiwrap.so
> ?
> 
> 

I seem to have the same problem. ./configure does find a usable mpicc
(though the "secondary target" seems to fail ????)

configure:8693: checking primary target for usable MPI2-compliant C compiler
and mpi.h
configure:8722: mpicc -o conftest -m32   conftest.c  >&5
configure:8728: $? = 0
configure:8732: test -z
                         || test ! -s conftest.err
configure:8735: $? = 0
configure:8738: test -s conftest
configure:8741: $? = 0
configure:8745: result: yes, mpicc
configure:8778: checking secondary target for usable MPI2-compliant C
compiler and mpi.h
configure:8811: mpicc this will surely fail -o conftest    conftest.c  >&5
cc: this: No such file or directory
cc: will: No such file or directory
cc: surely: No such file or directory
cc: fail: No such file or directory
configure:8817: $? = 1
configure: failed program was:
| /* confdefs.h.  */

The directory /usr/lib/valgrind/ only contains 1 file, python.supp, and I
cant find libmpiwrap.so anywhere on my system.

Here is my  http://www.nabble.com/file/p23424032/config.log config.log 

Any help greatly appreciated. Sorry if this is a double post.

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Re: [Valgrind-users] valgrind and MPI wrappers

[Seán <sea...@gm...>]

Seán wrote:
> 
> I seem to have the same problem. 
> 

I have solved my initial problem. It was caused by interference of another
valgrind version already installed. I did a "complete remove" using
synaptic, instead of the "remove" I had previously tried. I now have
libmpiwrap.so installed in the directory
/usr/local/lib/valgrind/x86-linux/libmpiwrap.so.

I am trying to run an MPI HelloWorld program with valgrind. I am not getting
the expected output
"valgrind MPI wrappers 31901: Active for pid 31901" . 
Instead I get:

sean@seanscomputer:~/CODE$
LD_PRELOAD=/usr/local/lib/valgrind/x86-linux/libmpiwrap.so mpirun -np 2
/usr/local/bin/valgrind ./main
==2869== Memcheck, a memory error detector.
==2869== Copyright (C) 2002-2008, and GNU GPL'd, by Julian Seward et al.
==2869== Using LibVEX rev 1884, a library for dynamic binary translation.
==2869== Copyright (C) 2004-2008, and GNU GPL'd, by OpenWorks LLP.
==2869== Using valgrind-3.4.1, a dynamic binary instrumentation framework.
==2869== Copyright (C) 2000-2008, and GNU GPL'd, by Julian Seward et al.
==2869== For more details, rerun with: -v
==2869== 
valgrind: seanscomputer: command not found
p0_2869:  p4_error: Child process exited while making connection to remote
process on localhost: 0
==2869== Conditional jump or move depends on uninitialised value(s)
......

Does anyone know what that "valgrind: hostname: command not found" error is?

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Re: [Valgrind-users] valgrind and MPI wrappers

[R. C. <rkc...@lb...>]

Sean,

I have encountered the same problem. The problem lies in how command-line
arguments are parsed.

Have a look at the following webpage

https://csd.vpac.org/twiki/bin/view/Tech/ParallelDebugging#Using_valgrind_with_MPICH_to_che

which gives instructions on getting valgrind to work with mpich. The upshot
is that you will have to create a mpirun_dbg.valgrind shell script that
parses the command line arguments correctly. This may require a little
monkeying around with the script, like stripping of quotes and such.

Hope this helps,
Robert


Seán wrote:
> 
> 
> Seán wrote:
>> 
>> I seem to have the same problem. 
>> 
> 
> I have solved my initial problem. It was caused by interference of another
> valgrind version already installed. I did a "complete remove" using
> synaptic, instead of the "remove" I had previously tried. I now have
> libmpiwrap.so installed in the directory
> /usr/local/lib/valgrind/x86-linux/libmpiwrap.so.
> 
> I am trying to run an MPI HelloWorld program with valgrind. I am not
> getting the expected output
> "valgrind MPI wrappers 31901: Active for pid 31901" . 
> Instead I get:
> 
> sean@seanscomputer:~/CODE$
> LD_PRELOAD=/usr/local/lib/valgrind/x86-linux/libmpiwrap.so mpirun -np 2
> /usr/local/bin/valgrind ./main
> ==2869== Memcheck, a memory error detector.
> ==2869== Copyright (C) 2002-2008, and GNU GPL'd, by Julian Seward et al.
> ==2869== Using LibVEX rev 1884, a library for dynamic binary translation.
> ==2869== Copyright (C) 2004-2008, and GNU GPL'd, by OpenWorks LLP.
> ==2869== Using valgrind-3.4.1, a dynamic binary instrumentation framework.
> ==2869== Copyright (C) 2000-2008, and GNU GPL'd, by Julian Seward et al.
> ==2869== For more details, rerun with: -v
> ==2869== 
> valgrind: seanscomputer: command not found
> p0_2869:  p4_error: Child process exited while making connection to remote
> process on localhost: 0
> ==2869== Conditional jump or move depends on uninitialised value(s)
> ......
> 
> Does anyone know what that "valgrind: hostname: command not found" error
> is?
> 
> 


-----
--
Robert Crockett
Postdoctoral Fellow
Applied Numerical Algorithms Group
Lawrence Berkeley National Laboratory
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Re: [Valgrind-users] valgrind and MPI wrappers

[Seán <sea...@gm...>]

Robert,

Fantastic! Valgrind now running with mpich, and returning meaningful
results.
A simple suppression file gets rid of a few extra errors associated with
things like MPI_Init.



R. Crockett wrote:
> 
> Sean,
> 
> I have encountered the same problem. The problem lies in how command-line
> arguments are parsed.
> 
> Have a look at the following webpage
> 
> https://csd.vpac.org/twiki/bin/view/Tech/ParallelDebugging#Using_valgrind_with_MPICH_to_che
> 
> which gives instructions on getting valgrind to work with mpich. The
> upshot is that you will have to create a mpirun_dbg.valgrind shell script
> that parses the command line arguments correctly. This may require a
> little monkeying around with the script, like stripping of quotes and
> such.
> 
> Hope this helps,
> Robert
> 
> 

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