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Subject: [hwloc-users] hwloc varning flag
From: Gabriele Fatigati (g.fatigati_at_[hidden])
Date: 2011-08-13 04:37:57


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