Newsgroups: comp.parallel.mpi From: "Y. Hamadi" Subject: Re: Installing MPI for Linux SMP? Organization: LIRMM - FRANCE Date: Thu, 23 Jul 1998 15:19:17 +0200 Mime-Version: 1.0 Content-Type: multipart/alternative; boundary="------------0221271684A2791E87A0A62E" Message-ID: <35B73854.AF6C0FB8@lirmm.fr> --------------0221271684A2791E87A0A62E Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Hi, Linux can be configured with a shared memory device, here is the solution (from this newsgroup). Personnaly i'm using it with RedHat5.0 on a P200 notebook. As a result, start-up time/execution time are faster than with a p4 configuration. Nevertheless you should control the amount of shared memory/semaphores generated by aborted execution (ipcs unix command). ============================================================================ Subject: Guideline to configure MPICH with shmem on Linux From: Wolfram Webers Date: 1998/06/23 Message-ID: <358F7344.3AF3296@cs.tu-berlin.de> Newsgroups: comp.parallel.mpi [More Headers] [Subscribe to comp.parallel.mpi] Ok, here's a small patch for mpich. 1. Edit the files mpid/ch_shmem/p2p_shmalloc.h 2. swap the lines: /* Reluctant default: System V shared memory segments. Look out for ipcs. */ #if !defined(SHMEM_PICKED) && defined(HAVE_MMAP) # define USE_MMAP # define SHMEM_PICKED #endif /* If there is nothing special then we will use mmap if we have it. */ #if !defined(SHMEM_PICKED) && defined(HAVE_SHMAT) # define USE_SHMAT # define SHMEM_PICKED #endif into: /* Reluctant default: System V shared memory segments. Look out for ipcs. */ #if !defined(SHMEM_PICKED) && defined(HAVE_SHMAT) # define USE_SHMAT # define SHMEM_PICKED #endif /* If there is nothing special then we will use mmap if we have it. */ #if !defined(SHMEM_PICKED) && defined(HAVE_MMAP) # define USE_MMAP # define SHMEM_PICKED #endif so on default the 'shmat' function is used. 3. If you like to use 'ch_lfshmem' you have to do so in ch_lfshmem 4. configure mpi with -device=ch_shmem or -device=ch_lfshmem This was it. Note that you have to start your application now with -np 2 .... rather than with mpirun -np 2 ... Ciao, Wolfram. ================================================================================== Lars Rzymianowicz wrote: > Shin-Cheng Mu wrote: > > Has anyone ever successfully installed MPI for Linux SMP? > > There are hundreds of MPI-Linux-Cluster around ;-) > > > During configuration, I tried both configure -device=ch_shmem > > and configure -device=ch_p4 -comm=shared . Both won't work, however. > > Running any example results in a "semget failed" error: > > Unfortunately, MPICH under Linux can't be configured with the Shared > Memory options. Look at the Install Guide, Linux chapter. This is based on > a different mmap implementation by Linux. > > The funny thing is, we were able to run programs just with this configuration. > We have 2 Dual-PentiumII PC's running: > lr@bonnie:/home/lr > uname -a > Linux bonnie 2.0.33 #7 Tue Jul 14 16:55:17 MEST 1998 i686 unknown > with SMP option turned on and MPICH 1.1.1 installed. > Here is our configure call: > # ./configure -arch=LINUX -comm=shared -device=ch_p4 -prefix=/opt/mpich-1.1.1 > -cc=gcc -mpe -opt=-O2 -nodevdebug > I just ran an app with 4 processes, two on each machine. > > Now my question is: Does Linux+MPICH(ch_p4, shared) only crash in special cases? > Any Ideas? > > Lars > -- > email: lr@mufasa.informatik.uni-mannheim.de > Homepage: http://mufasa.informatik.uni-mannheim.de/lsra/persons/lars/ -- Youssef HAMADI LIRMM - UMR 5506 CNRS/Universite Montpellier II 161, Rue Ada 34392 MONTPELLIER CEDEX 5 FRANCE Tel: (+33) 04 67 41 86 13 Fax: (+33) 04 67 41 85 00 http://www.lirmm.fr/~hamadi --------------0221271684A2791E87A0A62E Content-Type: text/html; charset=us-ascii Content-Transfer-Encoding: 7bit Hi,
Linux can be configured with a shared memory device, here is the solution (from this newsgroup). Personnaly i'm using it with RedHat5.0 on a P200 notebook. As a result, start-up time/execution time are faster than with a p4 configuration. Nevertheless you should control the amount of shared memory/semaphores generated by aborted execution (ipcs unix command).

============================================================================

Subject:      Guideline to configure MPICH with shmem on Linux
From:         Wolfram Webers <wwebers@cs.tu-berlin.de>
Date:         1998/06/23
Message-ID:   <358F7344.3AF3296@cs.tu-berlin.de>
Newsgroups:   comp.parallel.mpi
[More Headers]
[Subscribe to comp.parallel.mpi]

Ok, here's a small patch for mpich.

1. Edit the files

mpid/ch_shmem/p2p_shmalloc.h

2. swap the lines:

/* Reluctant default: System V shared memory segments. Look out for
ipcs. */
#if !defined(SHMEM_PICKED) && defined(HAVE_MMAP)
# define USE_MMAP
# define SHMEM_PICKED
#endif

/* If there is nothing special then we will use mmap if we have it. */
#if !defined(SHMEM_PICKED) && defined(HAVE_SHMAT)
# define USE_SHMAT
# define SHMEM_PICKED
#endif

into:

/* Reluctant default: System V shared memory segments. Look out for
ipcs. */
#if !defined(SHMEM_PICKED) && defined(HAVE_SHMAT)
# define USE_SHMAT
# define SHMEM_PICKED
#endif

/* If there is nothing special then we will use mmap if we have it. */
#if !defined(SHMEM_PICKED) && defined(HAVE_MMAP)
# define USE_MMAP
# define SHMEM_PICKED
#endif

so on default the 'shmat' function is used.

3. If you like to use 'ch_lfshmem' you have to do so in ch_lfshmem

4. configure mpi with -device=ch_shmem or -device=ch_lfshmem

This was it. Note that you have to start your application now with

<appl> -np 2 ....

rather than with mpirun -np 2 <appl> ...

Ciao, Wolfram.
==================================================================================

Lars Rzymianowicz wrote:

Shin-Cheng Mu wrote:
> Has anyone ever successfully installed MPI for Linux SMP?
There are hundreds of MPI-Linux-Cluster around ;-)
> During configuration, I tried both configure -device=ch_shmem
> and configure -device=ch_p4 -comm=shared . Both won't work, however.
> Running any example results in a "semget failed" error:
Unfortunately, MPICH under Linux can't be configured with the Shared
Memory options. Look at the Install Guide, Linux chapter. This is based on
a different mmap implementation by Linux.
The funny thing is, we were able to run programs just with this configuration.
We have 2 Dual-PentiumII PC's running:
lr@bonnie:/home/lr > uname -a
Linux bonnie 2.0.33 #7 Tue Jul 14 16:55:17 MEST 1998 i686 unknown
with SMP option turned on and MPICH 1.1.1 installed.
Here is our configure call:
# ./configure -arch=LINUX -comm=shared -device=ch_p4 -prefix=/opt/mpich-1.1.1
-cc=gcc -mpe -opt=-O2 -nodevdebug
I just ran an app with 4 processes, two on each machine.
Now my question is: Does Linux+MPICH(ch_p4, shared) only crash in special cases?
Any Ideas?
Lars
--
email: lr@mufasa.informatik.uni-mannheim.de
Homepage: http://mufasa.informatik.uni-mannheim.de/lsra/persons/lars/

-- 
 Youssef HAMADI                                           
  LIRMM - UMR 5506 CNRS/Universite Montpellier II                 
  161, Rue Ada  34392 MONTPELLIER CEDEX 5  FRANCE     
  Tel: (+33) 04 67 41 86 13  Fax: (+33) 04 67 41 85 00
 http://www.lirmm.fr/~hamadi

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