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Subject: Re: [hwloc-users] hwloc varning flag
From: Gabriele Fatigati (g.fatigati_at_[hidden])
Date: 2011-08-15 04:55:53


Hi Brice,

thanks for the info, but it means mbind() function could does not works in
some cases?

2011/8/14 Brice Goglin <Brice.Goglin_at_[hidden]>

> **
> FWIW it's worth, it's a "bug" in valgrind. The manpage of mbind does not
> exactly match the kernel requirements on mbind parameters. And valgrind
> fails at respecting the manpage anyway. See
> https://bugs.kde.org/show_bug.cgi?id=280083 for the mess...
>
> Brice
>
>
>
> Le 13/08/2011 15:07, Brice Goglin a écrit :
>
> 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 Tel: +39 051 6171722
>
> g.fatigati [AT] cineca.it
>
>
> _______________________________________________
> hwloc-users mailing listhwloc-users_at_[hidden]http://www.open-mpi.org/mailman/listinfo.cgi/hwloc-users
>
>
>
>

-- 
Ing. Gabriele Fatigati
HPC specialist
SuperComputing Applications and Innovation Department
Via Magnanelli 6/3, Casalecchio di Reno (BO) Italy
www.cineca.it                    Tel:   +39 051 6171722
g.fatigati [AT] cineca.it