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Subject: Re: [hwloc-users] hwloc varning flag
From: Brice Goglin (Brice.Goglin_at_[hidden])
Date: 2011-08-13 09:07:02


I think I am seeing this too on a custom program, so probably not your
application's fault.
Brice

Le 13/08/2011 10:37, Gabriele Fatigati a écrit :
>
>
> Dearhwloc users and developers,
>
> I'm using hwloc 1.2 stable version Intel 11 compiled and checking my
> little application with valgrind 3.5.
>
> My app calls hwloc_set_area_membind_nodeset() function from a OpenMP
> thread:
>
> hwloc_set_area_membind_nodeset(topology, mem, 10000, nodeset,
> HWLOC_MEMBIND_BIND, HWLOC_MEMBIND_THREAD | HWLOC_MEMBIND_STRICT |
> HWLOC_MEMBIND_NOCPUBIND )
>
> membind seems to work well, but valgrind give me a follow warning:
>
> ==2904== Syscall param mbind(nodemask) points to unaddressable byte(s)
> ==2904== at 0x4FF33C1: syscall6 (in /usr/lib64/libnuma.so.1)
> ==2904== by 0x4FF3436: mbind (in /usr/lib64/libnuma.so.1)
> ==2904== by 0x4C208AC: hwloc_linux_set_area_membind
> (topology-linux.c:1071)
> ==2904== by 0x4C1AC3E: hwloc_set_area_membind_nodeset (bind.c:396)
> ==2904== by 0x402165: bind_memory_tonode (main.c:97)
> ==2904== Address 0x5a64978 is 0 bytes after a block of size 8 alloc'd
> ==2904== at 0x4A05140: calloc (vg_replace_malloc.c:418)
> ==2904== by 0x4C20646: hwloc_linux_membind_mask_from_nodeset
> (topology-linux.c:996)
> ==2904== by 0x4C2083E: hwloc_linux_set_area_membind
> (topology-linux.c:1054)
> ==2904== by 0x4C1AC3E: hwloc_set_area_membind_nodeset (bind.c:396)
> ==2904== by 0x401CBB: bind_memory_tonode (main.c:97)
>
> valgrind has --tool=memcheck --leak-check=full exec flags.
>
> It give me the same warning also with just one byte memory bound.
>
> Is it a hwloc warning or my applications warning?
>
> Thanks in forward.
>
>
>
>
>
> --
> Ing. Gabriele Fatigati
>
> HPC specialist
>
> SuperComputing Applications and Innovation Department
>
> Via Magnanelli 6/3, Casalecchio di Reno (BO) Italy
>
> www.cineca.it <http://www.cineca.it> Tel: +39 051
> 6171722
>
> g.fatigati [AT] cineca.it <http://cineca.it>
>
>
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