Vector containing one number

[Barry Smith]

  This routine does make sends and receives of length zero;
this is legal in MPI but possibly Open-MPI has bugs dealing with
this.

   Barry


On Fri, 19 Jan 2007, Berend van Wachem wrote:

> Hi,
> 
> valgrind shows something related to open-mpi, see below. I'll try mpich 
> to see if the problem goes away.
> 
> Thanks,
> Berend.
> 
> 
> ==3683== Syscall param writev(vector[...]) points to uninitialised 
> byte(s)
> ==3683==    at 0x543A607: writev (in /lib64/tls/libc-2.3.6.so)
> ==3683==    by 0x5BE0AEA: mca_oob_tcp_msg_send_handler 
> (in /usr/local/lib/openmp                                                                                                                                                            
> i/mca_oob_tcp.so)
> ==3683==    by 0x5BE1827: mca_oob_tcp_peer_send 
> (in /usr/local/lib/openmpi/mca_o                                                                                                                                                            
> ob_tcp.so)
> ==3683==    by 0x5BE5B93: mca_oob_tcp_send_nb 
> (in /usr/local/lib/openmpi/mca_oob                                                                                                                                                            
> _tcp.so)
> ==3683==    by 0x4B47DBD: _orte_iof_base_frag_ack 
> (in /usr/local/lib/liborte.so.                                                                                                                                                            
> 0.0.0)
> ==3683==    by 0x4B47639: orte_iof_base_endpoint_forward 
> (in /usr/local/lib/libo                                                                                                                                                            
> rte.so.0.0.0)
> ==3683==    by 0x6D45538: orte_iof_svc_proxy_recv 
> (in /usr/local/lib/openmpi/mca                                                                                                                                                            
> _iof_svc.so)
> ==3683==    by 0x5BE137A: mca_oob_tcp_msg_recv_complete 
> (in /usr/local/lib/openm                                                                                                                                                            
> pi/mca_oob_tcp.so)
> ==3683==    by 0x5BE2D18: mca_oob_tcp_peer_recv_handler 
> (in /usr/local/lib/openm                                                                                                                                                            
> pi/mca_oob_tcp.so)
> ==3683==    by 0x4C7E466: opal_event_loop 
> (in /usr/local/lib/libopal.so.0.0.0)
> ==3683==    by 0x4C78A55: opal_progress 
> (in /usr/local/lib/libopal.so.0.0.0)
> ==3683==    by 0x4030AF: opal_condition_wait (condition.h:81)
> ==3683==  Address 0x41CF348 is not stack'd, malloc'd or (recently) 
> free'd
> 
>