Newsgroups: comp.parallel.mpi From: "Y. Hamadi" Subject: Re: Installing MPI for Linux SMP? Organization: LIRMM - FRANCE Date: Fri, 24 Jul 1998 14:49:43 +0200 Mime-Version: 1.0 Content-Type: multipart/alternative; boundary="------------DEED4DE66A1232154896AC83" Message-ID: <35B882E6.ADB4CAD0@lirmm.fr> --------------DEED4DE66A1232154896AC83 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Jongsoo Kim wrote: > > Nevertheless you should control the amount of shared > > memory/semaphores generated by aborted execution (ipcs unix command). > > > > I am using a Linux box with 2 PII processes. I have installed mpich > with ch_shmem device. But I got the following error messages. It seems > to be related to the above statement.Would you let me know how to > control the shared memory? > Hello,In fact, you can first control the shared memory / semaphore / message queue facilities with the ipcrm unix command (man ipcrm for details). But this will only allow you to delete previously made shared memory/semaphore/message queue.But for your problem (according to the output below), it seems that the shared memory are too huge for allocation. You can try to modify the maximum-size-of-shared-memory since there should be a constant in your system for specifying this limitation. Finally it seems (according to local linux-guru) that the linux kernel 2.1 provides a more efficient exploitation of SMP systems. Maybe you should move to this kernel? hopes this help.. yh > Sincerely yours, > Jongsoo Kim > --------------------------------------------------------------------- > > [jskim@triple]# ./main.x -np 2 > mmap failed: Invalid argument > OOPS: mmap failed: cannot map shared memory, size= 4194304 > IOT Trap > Abort (core dumped) > > [jskim@triple]# ipcs > > ------ Shared Memory Segments -------- > key shmid owner perms bytes nattch status > > ------ Semaphore Arrays -------- > key semid owner perms nsems status > 0x0000442e 0 jskim 600 10 > 0x000044b8 1 jskim 600 10 > 0x00004541 2 jskim 600 10 > > ------ Message Queues -------- > key msqid owner perms used-bytes messages -- 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 --------------DEED4DE66A1232154896AC83 Content-Type: text/html; charset=us-ascii Content-Transfer-Encoding: 7bit Jongsoo Kim wrote:
>  Nevertheless you should control the amount of shared
> memory/semaphores generated by aborted execution (ipcs unix command).
>

I am using a Linux box with 2 PII processes.   I have installed mpich
with ch_shmem device.  But I got the following error messages.  It seems
to be related to the above statement.Would you let me know how to
control the shared memory?
 

Hello,In fact, you can first control the shared memory / semaphore / message queue  facilities with the ipcrm unix command (man ipcrm for details). But this will only allow you to delete previously made shared memory/semaphore/message queue.But for your problem (according to the output below), it seems that the shared memory are too huge for allocation. You can try to modify the maximum-size-of-shared-memory since there should be a constant in your system for specifying this limitation. Finally it seems (according to local linux-guru) that the linux kernel 2.1 provides a more efficient exploitation of SMP systems. Maybe you should move to this kernel?

hopes this help..
yh

Sincerely yours,
Jongsoo Kim
---------------------------------------------------------------------

[jskim@triple]# ./main.x -np 2
mmap failed: Invalid argument
OOPS: mmap failed: cannot map shared memory, size= 4194304
IOT Trap
Abort (core dumped)

[jskim@triple]# ipcs

------ Shared Memory Segments --------
key        shmid     owner     perms     bytes     nattch    status

------ Semaphore Arrays --------
key       semid     owner     perms     nsems     status
0x0000442e 0         jskim     600       10
0x000044b8 1         jskim     600       10
0x00004541 2         jskim     600       10

------ Message Queues --------
key       msqid     owner     perms     used-bytes  messages

  
-- 
 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
  --------------DEED4DE66A1232154896AC83--