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Subject: Re: [OMPI devel] SHMEM symmetric objects in shared libraries
From: Shamis, Pavel (shamisp_at_[hidden])
Date: 2014-07-29 14:02:13


then in your main example below do a shmem_long_fadd on my_dso_val.
It won’t work unless you’ve put smarts in the shmem library to go through
the segments of loaded shared libraries and register them with the same
mechanism used for the data segment of the executable.

In this case the "smart" part will be pretty complex.

Best,
Pasha

Howard

From: devel [mailto:devel-bounces_at_[hidden]<mailto:devel-bounces_at_[hidden]>] On Behalf Of Joshua Ladd
Sent: Tuesday, July 29, 2014 10:57 AM
To: Open MPI Developers
Subject: Re: [OMPI devel] SHMEM symmetric objects in shared libraries

Are you claiming that in the following test, the static variable "val" will not be seen as a symmetric object?
#include "shmem.h"

int main( int argc, char **argv){
    long my_pe, npes, master;

    start_pes(0);
    my_pe = shmem_my_pe();
    npes = shmem_n_pes();

    master = npes - 1;

   /* only used on master */
   static long val = 0;

   if(my_pe != master ){
       shmem_long_fadd(&val,1,master);
   }

   shmem_barrier_all();
  return 0;
}
Josh

On Tue, Jul 29, 2014 at 11:27 AM, Bert Wesarg <bert.wesarg_at_[hidden]<mailto:bert.wesarg_at_[hidden]>> wrote:
Hi,

On 05/10/2014 02:46 PM, Bert Wesarg wrote:
Hi,

Btw, I'm pretty confident, that this Open SHMEM implementation does not
recognize global or static variables in shared libraries as symmetric
objects. It is probably wise to note this somewhere to the users.

I've never got an reply to this query. Any comments on it?

Bert

Kind regards,
Bert Wesarg

--
Dipl.-Inf. Bert Wesarg
wiss. Mitarbeiter
Technische Universität Dresden
Zentrum für Informationsdienste und Hochleistungsrechnen (ZIH)
01062 Dresden
Tel.: +49 (351) 463-42451<tel:%2B49%20%28351%29%20463-42451>
Fax: +49 (351) 463-37773<tel:%2B49%20%28351%29%20463-37773>
E-Mail: bert.wesarg_at_[hidden]<mailto:bert.wesarg_at_[hidden]>
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