Re: [hwloc-users] setting memory bindings

[Aulwes, Rob]

Hi Brice,

I've tried:

                  p = hwloc_alloc_membind_policy(_topo, cnt * sizeof (T),
                          mem_nodeset, HWLOC_MEMBIND_NEXTTOUCH, 0);

and

                  p = hwloc_alloc_membind_nodeset(_topo, cnt * sizeof (T),
                          mem_nodeset, HWLOC_MEMBIND_NEXTTOUCH, 0);

and


                  p = hwloc_alloc(_topo, cnt * sizeof (T));
  hwloc_set_area_membind_nodeset(_topo, p, cnt * sizeof (T),
                                         mem_nodeset, HWLOC_MEMBIND_NEXTTOUCH, 
0);

where

mem_nodeset = hwloc_topology_get_complete_nodeset(_topo);

Thanks,Rob

From: Brice Goglin <brice.gog...@inria.fr<mailto:brice.gog...@inria.fr>>
Reply-To: Hardware locality user list 
<hwloc-us...@open-mpi.org<mailto:hwloc-us...@open-mpi.org>>
List-Post: hwloc-users@lists.open-mpi.org
Date: Tue, 19 Aug 2014 18:44:05 +0200
To: Hardware locality user list 
<hwloc-us...@open-mpi.org<mailto:hwloc-us...@open-mpi.org>>
Subject: Re: [hwloc-users] setting memory bindings

Le 19/08/2014 18:38, Aulwes, Rob a écrit :
Hi,

I'm trying to write a custom C++ allocator that wraps hwloc calls.  I've tried 
using various hwloc_alloc* functions to set the memory bindings, but when I 
call hwloc_get_area_membind_nodeset to verify, I don't get the same policy I 
passed to alloc.  Are there example codes that show how to set memory bindings? 
 More generally, are there example codes that help illustrate how to use hwloc 
API?

Thanks,Rob Aulwes


Hello

Your problem may be related to the fact that same policies are identical on 
some operating systems. For instance DEFAULT and FIRST_TOUCH are often 
identical. What did you set and what did you get back?

There are many examples in the tests subdirectory, in doc/hwloc-helloc.c and in 
hwloc/helper.h and hwloc/inline.h, but I don't think we have much about the 
membind API, and this API isn't a easy one unfortunately (given the variety of 
existing policies and operating systems).

Brice

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