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Today's Topics:

   1. Re: Undefined MPI symbols linker error with XLF (Brian Barrett)

   2. Re: Running MPI program in a cluster (Brian Barrett)

   3. Re: Undefined MPI symbols linker error with XLF (Joe Griffin)

   4. Undefined reference to MPI_INIT (Viding Markus)

Brian

On Jul 9, 2007, at 3:50 PM, Aaron Thompson wrote:

Joe,

I'm not too familiar with Fortran, I'm only compiling a program  

from source (DLPOLY).  Could you tell me what compiler flags I  

could try or where I could look?  I didn't see anything too likely  

in the xlf manual.

Thank you,

Aaron Thompson

Vanderbilt University

aaron.p.thompson@vanderbilt.edu

On Jul 9, 2007, at 3:07 PM, lam-request@lam-mpi.org wrote:

Aaron,

Instead of trying to correct it with LDFLAGS at load time, Can you  

use compiler

options for your code to match the MPI entry points?

Joe

From: lam-bounces@lam-mpi.org [mailto:lam-bounces@lam-mpi.org] On  

Behalf Of Aaron Thompson

Sent: Monday, July 09, 2007 11:43 AM

To: General LAM/MPI mailing list

Subject: Re: LAM: Undefined MPI symbols linker error with XLF

Underscores could be the issue.  My program is calling MPI  

functions in all caps with no underscoring, e.g. MPI_SEND .  I  

tried adding -fno_underscoring to my LDFLAGS, but that didn't  

help.  Are there any other flags can I try using?

Thank you,

Aaron Thompson

Vanderbilt University

aaron.p.thompson@vanderbilt.edu

Could your problem be Case or leading or trailing underscores?

Some code has:

MPI_Send

mpi_send

mpi_send_

_mpi_send_

The code and MPI libs need to have the same Case and underscore  

policy.

Regards,

joe Griffin

_______________________________________________

This list is archived at http://www.lam-mpi.org/MailArchives/lam/

-- 

   Brian Barrett

   LAM/MPI Developer

   Make today a LAM/MPI day!

I use the lamboot comand to set up the LAM enviroment in a single  

computer,

i.e., "lamboot -v". I am running a simple master slave program and  

it runs

alright when I use the "mpirun -np 2 main" command. I then try to  

set up a

simple cluster with only 2 computers making the hostfile as you  

guys told in

the user guide pdf. It seems to boot fine. The strange thing is  

that when I

run my program in a single computer with 2 processes it runs way  

faster then

when I run it with process 0 in machine 0 and process 1 in machine  

1. Any

idea why this happens? Any help would be appreciated.

This isn't totally unexpected, especially if one of the processes  

doesn't require much CPU time or you are on an SMP machine.  When  

processes are on the same node, LAM/MPI will use shared memory for  

communication.  If your cluster only has ethernet, bandwidth is  

halved and latency can easily be two or three orders of magnitude  

higher when compared to shared memory.  If your application uses lots  

of short messages, the disparity between shared memory and TCP  

performance can be really easy to see.

Hope this helps,

Brian

-- 

   Brian Barrett

   LAM/MPI Developer

   Make today a LAM/MPI day!

From: "Joe Griffin" <joe.griffin@mscsoftware.com>

Date: July 10, 2007 1:21:26 AM EDT

To: "General LAM/MPI mailing list" <lam@lam-mpi.org>

Subject: Re: LAM: Undefined MPI symbols linker error with XLF

Reply-To: General LAM/MPI mailing list <lam@lam-mpi.org>

Aaron,

Brian's advice about using  XLF is right on.

Joe

________________________________

From: lam-bounces@lam-mpi.org on behalf of Aaron Thompson

Sent: Mon 7/9/2007 2:50 PM

To: General LAM/MPI mailing list

Subject: Re: LAM: Undefined MPI symbols linker error with XLF

Joe,

I'm not too familiar with Fortran, I'm only compiling a program from source (DLPOLY).  Could you tell me what compiler flags I could try or where I could look?  I didn't see anything too likely in the xlf manual.

Thank you,

Aaron Thompson

Vanderbilt University

aaron.p.thompson@vanderbilt.edu

On Jul 9, 2007, at 3:07 PM, lam-request@lam-mpi.org wrote:

Aaron,

 

Instead of trying to correct it with LDFLAGS at load time, Can you use compiler

options for your code to match the MPI entry points?

 

Joe

 

 

________________________________

From: lam-bounces@lam-mpi.org [mailto:lam-bounces@lam-mpi.org] On Behalf Of Aaron Thompson

Sent: Monday, July 09, 2007 11:43 AM

To: General LAM/MPI mailing list

Subject: Re: LAM: Undefined MPI symbols linker error with XLF

 

Underscores could be the issue.  My program is calling MPI functions in all caps with no underscoring, e.g. MPI_SEND .  I tried adding -fno_underscoring to my LDFLAGS, but that didn't help.  Are there any other flags can I try using?

 

Thank you,

 

Aaron Thompson

Vanderbilt University

aaron.p.thompson@vanderbilt.edu

 

 

Could your problem be Case or leading or trailing underscores?

 

Some code has:

 

MPI_Send

mpi_send

mpi_send_

_mpi_send_

 

The code and MPI libs need to have the same Case and underscore policy.

 

Regards,

joe Griffin

<winmail.dat>

From: Viding Markus <markus.viding@kockums.se>

Date: July 10, 2007 11:37:21 AM EDT

To: "'lam@lam-mpi.org'" <lam@lam-mpi.org>

Cc: "'support@absoft.com'" <support@absoft.com>

Subject: LAM: Undefined reference to MPI_INIT

Reply-To: General LAM/MPI mailing list <lam@lam-mpi.org>

Hi,

 

I am running LAM/MPI 7.1.3 with a Linux 2.4.21-27 kernel. The compiler I am using is an Absoft Fortran 95 10.0. Trying to run a simple Hello world:

 

PROGRAM HELLO

INCLUDE 'mpif.h'

 

INTEGER :: RANK, SIZE, IERR

 

CALL MPI_INIT(IERR)

CALL MPI_COMM_RANK(MPI_COMM_WORLD,RANK,IERR)

CALL MPI_COMM_SIZE(MPI_COMM_WORLD,SIZE,IERR)

 

PRINT *, 'Hello! I am ', RANK, 'of', SIZE

 

CALL MPI_FINALIZE(IERR)

STOP

END PROGRAM

 

------------------------------------

 

When running mpif77 -showme, I get:

 

F95 -I/opt/lam/lam-7_1_3/include -L/opt/lam/lam-7_1_3/lib -llammpio -llamf77mpi -lmpi -llam -laio -laio -lutil -lpthread -pthread -ldl

 

 

When trying to compile the application this is what happens.

 

[mavi4915@tor10 Multi]$ mpif77 Hello.f90

/tmp/a9IZW7/Hello.o(.text+0x2f): In function `MAIN__':

: undefined reference to `MPI_INIT'

/tmp/a9IZW7/Hello.o(.text+0x4d): In function `MAIN__':

: undefined reference to `MPI_COMM_RANK'

/tmp/a9IZW7/Hello.o(.text+0x6b): In function `MAIN__':

: undefined reference to `MPI_COMM_SIZE'

/tmp/a9IZW7/Hello.o(.text+0x1bf): In function `MAIN__':

: undefined reference to `MPI_FINALIZE'

collect2: ld returned 1 exit status

link failed.

mpif77: No such file or directory

 

I read that it could have to do with the compiler used when installing LAM and the compiler used when compiling the application. So, I installed LAM forcing it to use f95 when configuring:

 

./configure FC=f95 -with-fc=f95 -prefix=/opt/lam/lam-7_1_3/

 

Any suggestions what to try next??