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Subject: Re: [OMPI users] [openib] segfault when using openib btl
From: Eloi Gaudry (eg_at_[hidden])
Date: 2010-08-17 03:32:53


On Monday 16 August 2010 19:14:47 Jeff Squyres wrote:
> On Aug 16, 2010, at 10:05 AM, Eloi Gaudry wrote:
> > I did run our application through valgrind but it couldn't find any
> > "Invalid write": there is a bunch of "Invalid read" (I'm using 1.4.2
> > with the suppression file), "Use of uninitialized bytes" and
> > "Conditional jump depending on uninitialized bytes" in different ompi
> > routines. Some of them are located in btl_openib_component.c. I'll send
> > you an output of valgrind shortly.
>
> A lot of them in btl_openib_* are to be expected -- OpenFabrics uses
> OS-bypass methods for some of its memory, and therefore valgrind is
> unaware of them (and therefore incorrectly marks them as uninitialized).
would it help if i use the upcoming 1.5 version of openmpi ? i read that a huge effort has been done to clean-up the valgrind output ? but maybe that this doesn't
concern this btl (for the reasons you mentionned).

>
> > Another question, you said that the callback function pointer should
> > never be 0. But can the tag be null (hdr->tag) ?
>
> The tag is not a pointer -- it's just an integer.
I was worrying that its value could not be null.

I'll send a valgrind output soon (i need to build libpython without pymalloc first).

Thanks,
Eloi

>
> > Thanks for your help,
> > Eloi
> >
> > On 16/08/2010 18:22, Jeff Squyres wrote:
> >> Sorry for the delay in replying.
> >>
> >> Odd; the values of the callback function pointer should never be 0.
> >> This seems to suggest some kind of memory corruption is occurring.
> >>
> >> I don't know if it's possible, because the stack trace looks like you're
> >> calling through python, but can you run this application through
> >> valgrind, or some other memory-checking debugger?
> >>
> >> On Aug 10, 2010, at 7:15 AM, Eloi Gaudry wrote:
> >>> Hi,
> >>>
> >>> sorry, i just forgot to add the values of the function parameters:
> >>> (gdb) print reg->cbdata
> >>> $1 = (void *) 0x0
> >>> (gdb) print openib_btl->super
> >>> $2 = {btl_component = 0x2b341edd7380, btl_eager_limit = 12288,
> >>> btl_rndv_eager_limit = 12288, btl_max_send_size = 65536,
> >>> btl_rdma_pipeline_send_length = 1048576,
> >>>
> >>> btl_rdma_pipeline_frag_size = 1048576, btl_min_rdma_pipeline_size =
> >>> 1060864, btl_exclusivity = 1024, btl_latency = 10, btl_bandwidth =
> >>> 800, btl_flags = 310, btl_add_procs =
> >>> 0x2b341eb8ee47<mca_btl_openib_add_procs>, btl_del_procs =
> >>> 0x2b341eb90156<mca_btl_openib_del_procs>, btl_register = 0,
> >>> btl_finalize = 0x2b341eb93186<mca_btl_openib_finalize>, btl_alloc =
> >>> 0x2b341eb90a3e<mca_btl_openib_alloc>, btl_free =
> >>> 0x2b341eb91400<mca_btl_openib_free>, btl_prepare_src =
> >>> 0x2b341eb91813<mca_btl_openib_prepare_src>, btl_prepare_dst =
> >>> 0x2b341eb91f2e<mca_btl_openib_prepare_dst>, btl_send =
> >>> 0x2b341eb94517<mca_btl_openib_send>, btl_sendi =
> >>> 0x2b341eb9340d<mca_btl_openib_sendi>, btl_put =
> >>> 0x2b341eb94660<mca_btl_openib_put>, btl_get =
> >>> 0x2b341eb94c4e<mca_btl_openib_get>, btl_dump =
> >>> 0x2b341acd45cb<mca_btl_base_dump>, btl_mpool = 0xf3f4110,
> >>> btl_register_error =
> >>> 0x2b341eb90565<mca_btl_openib_register_error_cb>, btl_ft_event =
> >>> 0x2b341eb952e7<mca_btl_openib_ft_event>}
> >>>
> >>> (gdb) print hdr->tag
> >>> $3 = 0 '\0'
> >>> (gdb) print des
> >>> $4 = (mca_btl_base_descriptor_t *) 0xf4a6700
> >>> (gdb) print reg->cbfunc
> >>> $5 = (mca_btl_base_module_recv_cb_fn_t) 0
> >>>
> >>> Eloi
> >>>
> >>> On Tuesday 10 August 2010 16:04:08 Eloi Gaudry wrote:
> >>>> Hi,
> >>>>
> >>>> Here is the output of a core file generated during a segmentation
> >>>> fault observed during a collective call (using openib):
> >>>>
> >>>> #0 0x0000000000000000 in ?? ()
> >>>> (gdb) where
> >>>> #0 0x0000000000000000 in ?? ()
> >>>> #1 0x00002aedbc4e05f4 in btl_openib_handle_incoming
> >>>> (openib_btl=0x1902f9b0, ep=0x1908a1c0, frag=0x190d9700, byte_len=18)
> >>>> at btl_openib_component.c:2881 #2 0x00002aedbc4e25e2 in handle_wc
> >>>> (device=0x19024ac0, cq=0, wc=0x7ffff279ce90) at
> >>>> btl_openib_component.c:3178 #3 0x00002aedbc4e2e9d in poll_device
> >>>> (device=0x19024ac0, count=2) at btl_openib_component.c:3318 #4
> >>>> 0x00002aedbc4e34b8 in progress_one_device (device=0x19024ac0) at
> >>>> btl_openib_component.c:3426 #5 0x00002aedbc4e3561 in
> >>>> btl_openib_component_progress () at btl_openib_component.c:3451 #6
> >>>> 0x00002aedb8b22ab8 in opal_progress () at runtime/opal_progress.c:207
> >>>> #7 0x00002aedb859f497 in opal_condition_wait (c=0x2aedb888ccc0,
> >>>> m=0x2aedb888cd20) at ../opal/threads/condition.h:99 #8
> >>>> 0x00002aedb859fa31 in ompi_request_default_wait_all (count=2,
> >>>> requests=0x7ffff279d0e0, statuses=0x0) at request/req_wait.c:262 #9
> >>>> 0x00002aedbd7559ad in
> >>>> ompi_coll_tuned_allreduce_intra_recursivedoubling
> >>>> (sbuf=0x7ffff279d444, rbuf=0x7ffff279d440, count=1, dtype=0x6788220,
> >>>> op=0x6787a20,
> >>>> comm=0x19d81ff0, module=0x19d82b20) at coll_tuned_allreduce.c:223
> >>>> #10 0x00002aedbd7514f7 in ompi_coll_tuned_allreduce_intra_dec_fixed
> >>>> (sbuf=0x7ffff279d444, rbuf=0x7ffff279d440, count=1, dtype=0x6788220,
> >>>> op=0x6787a20, comm=0x19d81ff0, module=0x19d82b20) at
> >>>> coll_tuned_decision_fixed.c:63
> >>>> #11 0x00002aedb85c7792 in PMPI_Allreduce (sendbuf=0x7ffff279d444,
> >>>> recvbuf=0x7ffff279d440, count=1, datatype=0x6788220, op=0x6787a20,
> >>>> comm=0x19d81ff0) at pallreduce.c:102 #12 0x0000000004387dbf in
> >>>> FEMTown::MPI::Allreduce (sendbuf=0x7ffff279d444,
> >>>> recvbuf=0x7ffff279d440, count=1, datatype=0x6788220, op=0x6787a20,
> >>>> comm=0x19d81ff0) at stubs.cpp:626 #13 0x0000000004058be8 in
> >>>> FEMTown::Domain::align (itf=
> >>>>
> >>>> {<FEMTown::Boost::shared_base_ptr<FEMTown::Domain::Interfa
> >>>> ce>>
> >>>>
> >>>> = {_vptr.shared_base_ptr = 0x7ffff279d620, ptr_ = {px = 0x199942a4, pn
> >>>> = {pi_ = 0x6}}},<No data fields>}) at interface.cpp:371
> >>>> #14 0x00000000040cb858 in
> >>>> FEMTown::Field::detail::align_itfs_and_neighbhors (dim=2, set={px =
> >>>> 0x7ffff279d780, pn = {pi_ = 0x2f279d640}},
> >>>> check_info=@0x7ffff279d7f0) at check.cpp:63 #15 0x00000000040cbfa8 in
> >>>> FEMTown::Field::align_elements (set={px = 0x7ffff279d950, pn = {pi_ =
> >>>> 0x66e08d0}}, check_info=@0x7ffff279d7f0) at check.cpp:159 #16
> >>>> 0x00000000039acdd4 in PyField_align_elements (self=0x0,
> >>>> args=0x2aaab0765050, kwds=0x19d2e950) at check.cpp:31 #17
> >>>> 0x0000000001fbf76d in FEMTown::Main::ExErrCatch<_object* (*)(_object*,
> >>>> _object*, _object*)>::exec<_object> (this=0x7ffff279dc20, s=0x0,
> >>>> po1=0x2aaab0765050, po2=0x19d2e950) at
> >>>> /home/qa/svntop/femtown/modules/main/py/exception.hpp:463
> >>>> #18 0x00000000039acc82 in PyField_align_elements_ewrap (self=0x0,
> >>>> args=0x2aaab0765050, kwds=0x19d2e950) at check.cpp:39 #19
> >>>> 0x00000000044093a0 in PyEval_EvalFrameEx (f=0x19b52e90,
> >>>> throwflag=<value optimized out>) at Python/ceval.c:3921 #20
> >>>> 0x000000000440aae9 in PyEval_EvalCodeEx (co=0x2aaab754ad50,
> >>>> globals=<value optimized out>, locals=<value optimized out>,
> >>>> args=0x3, argcount=1, kws=0x19ace4a0, kwcount=2, defs=0x2aaab75e4800,
> >>>> defcount=2, closure=0x0) at
> >>>> Python/ceval.c:2968
> >>>> #21 0x0000000004408f58 in PyEval_EvalFrameEx (f=0x19ace2d0,
> >>>> throwflag=<value optimized out>) at Python/ceval.c:3802 #22
> >>>> 0x000000000440aae9 in PyEval_EvalCodeEx (co=0x2aaab7550120,
> >>>> globals=<value optimized out>, locals=<value optimized out>,
> >>>> args=0x7, argcount=1, kws=0x19acc418, kwcount=3, defs=0x2aaab759e958,
> >>>> defcount=6, closure=0x0) at Python/ceval.c:2968
> >>>> #23 0x0000000004408f58 in PyEval_EvalFrameEx (f=0x19acc1c0,
> >>>> throwflag=<value optimized out>) at Python/ceval.c:3802 #24
> >>>> 0x000000000440aae9 in PyEval_EvalCodeEx (co=0x2aaab8b5e738,
> >>>> globals=<value optimized out>, locals=<value optimized out>,
> >>>> args=0x6, argcount=1, kws=0x19abd328, kwcount=5, defs=0x2aaab891b7e8,
> >>>> defcount=3, closure=0x0) at Python/ceval.c:2968
> >>>> #25 0x0000000004408f58 in PyEval_EvalFrameEx (f=0x19abcea0,
> >>>> throwflag=<value optimized out>) at Python/ceval.c:3802 #26
> >>>> 0x000000000440aae9 in PyEval_EvalCodeEx (co=0x2aaab3eb4198,
> >>>> globals=<value optimized out>, locals=<value optimized out>,
> >>>> args=0xb, argcount=1, kws=0x19a89df0, kwcount=10, defs=0x0,
> >>>> defcount=0, closure=0x0) at Python/ceval.c:2968
> >>>> #27 0x0000000004408f58 in PyEval_EvalFrameEx (f=0x19a89c40,
> >>>> throwflag=<value optimized out>) at Python/ceval.c:3802 #28
> >>>> 0x000000000440aae9 in PyEval_EvalCodeEx (co=0x2aaab3eb4288,
> >>>> globals=<value optimized out>, locals=<value optimized out>,
> >>>> args=0x1, argcount=0, kws=0x19a89330, kwcount=0, defs=0x2aaab8b66668,
> >>>> defcount=1, closure=0x0) at Python/ceval.c:2968
> >>>> #29 0x0000000004408f58 in PyEval_EvalFrameEx (f=0x19a891b0,
> >>>> throwflag=<value optimized out>) at Python/ceval.c:3802 #30
> >>>> 0x000000000440aae9 in PyEval_EvalCodeEx (co=0x2aaab8b6a738,
> >>>> globals=<value optimized out>, locals=<value optimized out>,
> >>>> args=0x0, argcount=0, kws=0x0, kwcount=0, defs=0x0, defcount=0,
> >>>> closure=0x0) at
> >>>> Python/ceval.c:2968
> >>>> #31 0x000000000440ac02 in PyEval_EvalCode (co=0x1902f9b0, globals=0x0,
> >>>> locals=0x190d9700) at Python/ceval.c:522 #32 0x000000000442853c in
> >>>> PyRun_StringFlags (str=0x192fd3d8 "DIRECT.Actran.main()", start=<value
> >>>> optimized out>, globals=0x192213d0, locals=0x192213d0, flags=0x0) at
> >>>> Python/pythonrun.c:1335 #33 0x0000000004429690 in
> >>>> PyRun_SimpleStringFlags (command=0x192fd3d8 "DIRECT.Actran.main()",
> >>>> flags=0x0) at
> >>>> Python/pythonrun.c:957 #34 0x0000000001fa1cf9 in
> >>>> FEMTown::Python::FEMPy::run_application (this=0x7ffff279f650) at
> >>>> fempy.cpp:873 #35 0x000000000434ce99 in FEMTown::Main::Batch::run
> >>>> (this=0x7ffff279f650) at batch.cpp:374 #36 0x0000000001f9aa25 in main
> >>>> (argc=8, argv=0x7ffff279fa48) at main.cpp:10 (gdb) f 1
> >>>> #1 0x00002aedbc4e05f4 in btl_openib_handle_incoming
> >>>> (openib_btl=0x1902f9b0, ep=0x1908a1c0, frag=0x190d9700, byte_len=18)
> >>>> at btl_openib_component.c:2881 2881 reg->cbfunc(
> >>>> &openib_btl->super, hdr->tag, des, reg->cbdata ); Current language:
> >>>> auto; currently c
> >>>> (gdb)
> >>>> #1 0x00002aedbc4e05f4 in btl_openib_handle_incoming
> >>>> (openib_btl=0x1902f9b0, ep=0x1908a1c0, frag=0x190d9700, byte_len=18)
> >>>> at btl_openib_component.c:2881 2881 reg->cbfunc(
> >>>> &openib_btl->super, hdr->tag, des, reg->cbdata ); (gdb) l
> >>>> 2876
> >>>> 2877 if(OPAL_LIKELY(!(is_credit_msg =
> >>>> is_credit_message(frag)))) { 2878 /* call registered
> >>>> callback */
> >>>> 2879 mca_btl_active_message_callback_t* reg;
> >>>> 2880 reg = mca_btl_base_active_message_trigger + hdr->tag;
> >>>> 2881 reg->cbfunc(&openib_btl->super, hdr->tag, des,
> >>>> reg->cbdata ); 2882 if(MCA_BTL_OPENIB_RDMA_FRAG(frag)) {
> >>>> 2883 cqp = (hdr->credits>> 11)& 0x0f;
> >>>> 2884 hdr->credits&= 0x87ff;
> >>>> 2885 } else {
> >>>>
> >>>> Regards,
> >>>> Eloi
> >>>>
> >>>> On Friday 16 July 2010 16:01:02 Eloi Gaudry wrote:
> >>>>> Hi Edgar,
> >>>>>
> >>>>> The only difference I could observed was that the segmentation fault
> >>>>> appeared sometimes later during the parallel computation.
> >>>>>
> >>>>> I'm running out of idea here. I wish I could use the "--mca coll
> >>>>> tuned" with "--mca self,sm,tcp" so that I could check that the issue
> >>>>> is not somehow limited to the tuned collective routines.
> >>>>>
> >>>>> Thanks,
> >>>>> Eloi
> >>>>>
> >>>>> On Thursday 15 July 2010 17:24:24 Edgar Gabriel wrote:
> >>>>>> On 7/15/2010 10:18 AM, Eloi Gaudry wrote:
> >>>>>>> hi edgar,
> >>>>>>>
> >>>>>>> thanks for the tips, I'm gonna try this option as well. the
> >>>>>>> segmentation fault i'm observing always happened during a
> >>>>>>> collective communication indeed... does it basically switch all
> >>>>>>> collective communication to basic mode, right ?
> >>>>>>>
> >>>>>>> sorry for my ignorance, but what's a NCA ?
> >>>>>>
> >>>>>> sorry, I meant to type HCA (InifinBand networking card)
> >>>>>>
> >>>>>> Thanks
> >>>>>> Edgar
> >>>>>>
> >>>>>>> thanks,
> >>>>>>> éloi
> >>>>>>>
> >>>>>>> On Thursday 15 July 2010 16:20:54 Edgar Gabriel wrote:
> >>>>>>>> you could try first to use the algorithms in the basic module,
> >>>>>>>> e.g.
> >>>>>>>>
> >>>>>>>> mpirun -np x --mca coll basic ./mytest
> >>>>>>>>
> >>>>>>>> and see whether this makes a difference. I used to observe
> >>>>>>>> sometimes a (similar ?) problem in the openib btl triggered from
> >>>>>>>> the tuned collective component, in cases where the ofed libraries
> >>>>>>>> were installed but no NCA was found on a node. It used to work
> >>>>>>>> however with the basic component.
> >>>>>>>>
> >>>>>>>> Thanks
> >>>>>>>> Edgar
> >>>>>>>>
> >>>>>>>> On 7/15/2010 3:08 AM, Eloi Gaudry wrote:
> >>>>>>>>> hi Rolf,
> >>>>>>>>>
> >>>>>>>>> unfortunately, i couldn't get rid of that annoying segmentation
> >>>>>>>>> fault when selecting another bcast algorithm. i'm now going to
> >>>>>>>>> replace MPI_Bcast with a naive implementation (using MPI_Send and
> >>>>>>>>> MPI_Recv) and see if that helps.
> >>>>>>>>>
> >>>>>>>>> regards,
> >>>>>>>>> éloi
> >>>>>>>>>
> >>>>>>>>> On Wednesday 14 July 2010 10:59:53 Eloi Gaudry wrote:
> >>>>>>>>>> Hi Rolf,
> >>>>>>>>>>
> >>>>>>>>>> thanks for your input. You're right, I miss the
> >>>>>>>>>> coll_tuned_use_dynamic_rules option.
> >>>>>>>>>>
> >>>>>>>>>> I'll check if I the segmentation fault disappears when using the
> >>>>>>>>>> basic bcast linear algorithm using the proper command line you
> >>>>>>>>>> provided.
> >>>>>>>>>>
> >>>>>>>>>> Regards,
> >>>>>>>>>> Eloi
> >>>>>>>>>>
> >>>>>>>>>> On Tuesday 13 July 2010 20:39:59 Rolf vandeVaart wrote:
> >>>>>>>>>>> Hi Eloi:
> >>>>>>>>>>> To select the different bcast algorithms, you need to add an
> >>>>>>>>>>> extra mca parameter that tells the library to use dynamic
> >>>>>>>>>>> selection. --mca coll_tuned_use_dynamic_rules 1
> >>>>>>>>>>>
> >>>>>>>>>>> One way to make sure you are typing this in correctly is to use
> >>>>>>>>>>> it with ompi_info. Do the following:
> >>>>>>>>>>> ompi_info -mca coll_tuned_use_dynamic_rules 1 --param coll
> >>>>>>>>>>>
> >>>>>>>>>>> You should see lots of output with all the different algorithms
> >>>>>>>>>>> that can be selected for the various collectives.
> >>>>>>>>>>> Therefore, you need this:
> >>>>>>>>>>>
> >>>>>>>>>>> --mca coll_tuned_use_dynamic_rules 1 --mca
> >>>>>>>>>>> coll_tuned_bcast_algorithm 1
> >>>>>>>>>>>
> >>>>>>>>>>> Rolf
> >>>>>>>>>>>
> >>>>>>>>>>> On 07/13/10 11:28, Eloi Gaudry wrote:
> >>>>>>>>>>>> Hi,
> >>>>>>>>>>>>
> >>>>>>>>>>>> I've found that "--mca coll_tuned_bcast_algorithm 1" allowed
> >>>>>>>>>>>> to switch to the basic linear algorithm. Anyway whatever the
> >>>>>>>>>>>> algorithm used, the segmentation fault remains.
> >>>>>>>>>>>>
> >>>>>>>>>>>> Does anyone could give some advice on ways to diagnose the
> >>>>>>>>>>>> issue I'm facing ?
> >>>>>>>>>>>>
> >>>>>>>>>>>> Regards,
> >>>>>>>>>>>> Eloi
> >>>>>>>>>>>>
> >>>>>>>>>>>> On Monday 12 July 2010 10:53:58 Eloi Gaudry wrote:
> >>>>>>>>>>>>> Hi,
> >>>>>>>>>>>>>
> >>>>>>>>>>>>> I'm focusing on the MPI_Bcast routine that seems to randomly
> >>>>>>>>>>>>> segfault when using the openib btl. I'd like to know if there
> >>>>>>>>>>>>> is any way to make OpenMPI switch to a different algorithm
> >>>>>>>>>>>>> than the default one being selected for MPI_Bcast.
> >>>>>>>>>>>>>
> >>>>>>>>>>>>> Thanks for your help,
> >>>>>>>>>>>>> Eloi
> >>>>>>>>>>>>>
> >>>>>>>>>>>>> On Friday 02 July 2010 11:06:52 Eloi Gaudry wrote:
> >>>>>>>>>>>>>> Hi,
> >>>>>>>>>>>>>>
> >>>>>>>>>>>>>> I'm observing a random segmentation fault during an
> >>>>>>>>>>>>>> internode parallel computation involving the openib btl and
> >>>>>>>>>>>>>> OpenMPI-1.4.2 (the same issue can be observed with
> >>>>>>>>>>>>>> OpenMPI-1.3.3).
> >>>>>>>>>>>>>>
> >>>>>>>>>>>>>> mpirun (Open MPI) 1.4.2
> >>>>>>>>>>>>>> Report bugs to http://www.open-mpi.org/community/help/
> >>>>>>>>>>>>>> [pbn08:02624] *** Process received signal ***
> >>>>>>>>>>>>>> [pbn08:02624] Signal: Segmentation fault (11)
> >>>>>>>>>>>>>> [pbn08:02624] Signal code: Address not mapped (1)
> >>>>>>>>>>>>>> [pbn08:02624] Failing at address: (nil)
> >>>>>>>>>>>>>> [pbn08:02624] [ 0] /lib64/libpthread.so.0 [0x349540e4c0]
> >>>>>>>>>>>>>> [pbn08:02624] *** End of error message ***
> >>>>>>>>>>>>>> sh: line 1: 2624 Segmentation fault
> >>>>>>>>>>>>>>
> >>>>>>>>>>>>>> \/share\/hpc3\/actran_suite\/Actran_11\.0\.rc2\.41872\/RedHa
> >>>>>>>>>>>>>> tE L\ -5 \/ x 86 _6 4\ /bin\/actranpy_mp
> >>>>>>>>>>>>>> '--apl=/share/hpc3/actran_suite/Actran_11.0.rc2.41872/RedHat
> >>>>>>>>>>>>>> EL -5 /x 86 _ 64 /A c tran_11.0.rc2.41872'
> >>>>>>>>>>>>>> '--inputfile=/work/st25652/LSF_130073_0_47696_0/Case1_3Dreal
> >>>>>>>>>>>>>> _m 4_ n2 .d a t'
> >>>>>>>>>>>>>> '--scratch=/scratch/st25652/LSF_130073_0_47696_0/scratch'
> >>>>>>>>>>>>>> '--mem=3200' '--threads=1' '--errorlevel=FATAL'
> >>>>>>>>>>>>>> '--t_max=0.1' '--parallel=domain'
> >>>>>>>>>>>>>>
> >>>>>>>>>>>>>> If I choose not to use the openib btl (by using --mca btl
> >>>>>>>>>>>>>> self,sm,tcp on the command line, for instance), I don't
> >>>>>>>>>>>>>> encounter any problem and the parallel computation runs
> >>>>>>>>>>>>>> flawlessly.
> >>>>>>>>>>>>>>
> >>>>>>>>>>>>>> I would like to get some help to be able:
> >>>>>>>>>>>>>> - to diagnose the issue I'm facing with the openib btl
> >>>>>>>>>>>>>> - understand why this issue is observed only when using the
> >>>>>>>>>>>>>> openib btl and not when using self,sm,tcp
> >>>>>>>>>>>>>>
> >>>>>>>>>>>>>> Any help would be very much appreciated.
> >>>>>>>>>>>>>>
> >>>>>>>>>>>>>> The outputs of ompi_info and the configure scripts of
> >>>>>>>>>>>>>> OpenMPI are enclosed to this email, and some information on
> >>>>>>>>>>>>>> the infiniband drivers as well.
> >>>>>>>>>>>>>>
> >>>>>>>>>>>>>> Here is the command line used when launching a parallel
> >>>>>>>>>>>>>> computation
> >>>>>>>>>>>>>>
> >>>>>>>>>>>>>> using infiniband:
> >>>>>>>>>>>>>> path_to_openmpi/bin/mpirun -np $NPROCESS --hostfile
> >>>>>>>>>>>>>> host.list --mca
> >>>>>>>>>>>>>>
> >>>>>>>>>>>>>> btl openib,sm,self,tcp --display-map --verbose --version
> >>>>>>>>>>>>>> --mca mpi_warn_on_fork 0 --mca btl_openib_want_fork_support
> >>>>>>>>>>>>>> 0 [...]
> >>>>>>>>>>>>>>
> >>>>>>>>>>>>>> and the command line used if not using infiniband:
> >>>>>>>>>>>>>> path_to_openmpi/bin/mpirun -np $NPROCESS --hostfile
> >>>>>>>>>>>>>> host.list --mca
> >>>>>>>>>>>>>>
> >>>>>>>>>>>>>> btl self,sm,tcp --display-map --verbose --version --mca
> >>>>>>>>>>>>>> mpi_warn_on_fork 0 --mca btl_openib_want_fork_support 0
> >>>>>>>>>>>>>> [...]
> >>>>>>>>>>>>>>
> >>>>>>>>>>>>>> Thanks,
> >>>>>>>>>>>>>> Eloi
> >>>>>>>>>>>>
> >>>>>>>>>>>> _______________________________________________
> >>>>>>>>>>>> users mailing list
> >>>>>>>>>>>> users_at_[hidden]
> >>>>>>>>>>>> http://www.open-mpi.org/mailman/listinfo.cgi/users
> >>>
> >>> --
> >>>
> >>>
> >>> Eloi Gaudry
> >>>
> >>> Free Field Technologies
> >>> Company Website: http://www.fft.be
> >>> Company Phone: +32 10 487 959
> >>>
> >>> _______________________________________________
> >>> users mailing list
> >>> users_at_[hidden]
> >>> http://www.open-mpi.org/mailman/listinfo.cgi/user
> >
> > _______________________________________________
> > users mailing list
> > users_at_[hidden]
> > http://www.open-mpi.org/mailman/listinfo.cgi/users

-- 
Eloi Gaudry
Free Field Technologies
Company Website: http://www.fft.be
Company Phone:   +32 10 487 959