[mpich-discuss] Using MPICH2 with shared memeory

[Pavan Balaji]

Hello,

All three should be using shared memory. Sockets are used for other 
purposes such as process management, so just checking if sockets are 
created is not a good way to determine if shared memory is being used. 
MPI communication should happen using shared memory for processes on the 
same node in all three cases (though nemesis is the preferred way).

  -- Pavan

On 04/13/2010 06:25 AM, Dai-Hee Kim wrote:
> Hello, everyone
>  
> I am testing MPICH2 on 24 cores SMP machine.
> And, I installed MPICH2 with three devices (nemesis, ssm, 
> shm) separately and run parallel program with each device.
>  
> However, it seems that no device was using shared memory when I checked 
> the performance
> and network status using netstat command (a lot of sockets created for 
> self connection)
> Of course, I could not see any shared memory segments through ipcs -m 
> and free commands
>  
> I compiled MPICH2 with three devices by below configuration options 
> respectively
>  
> ./configure --prefix=.../nemesis --enable-fast=03 --with-device=ch3:nemesis
> ./configure --prefix=.../ssm       --enable-fast=03 --with-device=ch3:ssm
> ./configure --prefix=.../shm --enable-fast=03 --with-device=ch3:shm
>  
> and complied and run the parallel program using scripts (mpif90 and 
> mpiexec) in different prefix directory depending on which device I used 
> for testing.
>  
> Do I need to put some another options for installing MPICH2 or running 
> the parallel program with shared memory?
> Is there anything I missed?
>  
> I really appreciate for your concern.
>  
> Thank you.
>   
>  
>  
>  
> 
> 
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-- 
Pavan Balaji
http://www.mcs.anl.gov/~balaji