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Subject: Re: [OMPI users] MPI process dies with a route error when using dynamic process calls to connect more than 2 clients to a server with InfiniBand
From: Ralph Castain (rhc_at_[hidden])
Date: 2010-08-23 15:24:10


Can you send me the values you are using for the relevant envars? That way I can try to replicate here

On Aug 23, 2010, at 1:15 PM, Philippe wrote:

> I took a look at the code but I'm afraid I dont see anything wrong.
>
> p.
>
> On Thu, Aug 19, 2010 at 2:32 PM, Ralph Castain <rhc_at_[hidden]> wrote:
>> Yes, that is correct - we reserve the first port in the range for a daemon,
>> should one exist.
>> The problem is clearly that get_node_rank is returning the wrong value for
>> the second process (your rank=1). If you want to dig deeper, look at the
>> orte/mca/ess/generic code where it generates the nidmap and pidmap. There is
>> a bug down there somewhere that gives the wrong answer when ppn > 1.
>>
>>
>> On Thu, Aug 19, 2010 at 12:12 PM, Philippe <philmpi_at_[hidden]> wrote:
>>>
>>> Ralph,
>>>
>>> somewhere in ./orte/mca/oob/tcp/oob_tcp.c, there is this comment:
>>>
>>> orte_node_rank_t nrank;
>>> /* do I know my node_local_rank yet? */
>>> if (ORTE_NODE_RANK_INVALID != (nrank =
>>> orte_ess.get_node_rank(ORTE_PROC_MY_NAME)) &&
>>> (nrank+1) <
>>> opal_argv_count(mca_oob_tcp_component.tcp4_static_ports)) {
>>> /* any daemon takes the first entry, so we start
>>> with the second */
>>>
>>> which seems constant with process #0 listening on 10001. the question
>>> would be why process #1 attempt to connect to port 10000 then? or
>>> maybe totally unrelated :-)
>>>
>>> btw, if I trick process #1 to open the connection to 10001 by shifting
>>> the range, I now get this error and the process terminate immediately:
>>>
>>> [c0301b10e1:03919] [[0,9999],1]-[[0,0],0]
>>> mca_oob_tcp_peer_recv_connect_ack: received unexpected process
>>> identifier [[0,9999],0]
>>>
>>> good luck with the surgery and wishing you a prompt recovery!
>>>
>>> p.
>>>
>>> On Thu, Aug 19, 2010 at 2:02 PM, Ralph Castain <rhc_at_[hidden]> wrote:
>>>> Something doesn't look right - here is what the algo attempts to do:
>>>> given a port range of 10000-12000, the lowest rank'd process on the node
>>>> should open port 10000. The next lowest rank on the node will open
>>>> 10001,
>>>> etc.
>>>> So it looks to me like there is some confusion in the local rank algo.
>>>> I'll
>>>> have to look at the generic module - must be a bug in it somewhere.
>>>> This might take a couple of days as I have surgery tomorrow morning, so
>>>> please forgive the delay.
>>>>
>>>> On Thu, Aug 19, 2010 at 11:13 AM, Philippe <philmpi_at_[hidden]>
>>>> wrote:
>>>>>
>>>>> Ralph,
>>>>>
>>>>> I'm able to use the generic module when the processes are on different
>>>>> machines.
>>>>>
>>>>> what would be the values of the EV when two processes are on the same
>>>>> machine (hopefully talking over SHM).
>>>>>
>>>>> i've played with combination of nodelist and ppn but no luck. I get
>>>>> errors
>>>>> like:
>>>>>
>>>>>
>>>>>
>>>>> [c0301b10e1:03172] [[0,9999],1] -> [[0,0],0] (node: c0301b10e1)
>>>>> oob-tcp: Number of attempts to create TCP connection has been
>>>>> exceeded. Can not communicate with peer
>>>>> [c0301b10e1:03172] [[0,9999],1] ORTE_ERROR_LOG: Unreachable in file
>>>>> grpcomm_hier_module.c at line 303
>>>>> [c0301b10e1:03172] [[0,9999],1] ORTE_ERROR_LOG: Unreachable in file
>>>>> base/grpcomm_base_modex.c at line 470
>>>>> [c0301b10e1:03172] [[0,9999],1] ORTE_ERROR_LOG: Unreachable in file
>>>>> grpcomm_hier_module.c at line 484
>>>>>
>>>>> --------------------------------------------------------------------------
>>>>> It looks like MPI_INIT failed for some reason; your parallel process is
>>>>> likely to abort. There are many reasons that a parallel process can
>>>>> fail during MPI_INIT; some of which are due to configuration or
>>>>> environment
>>>>> problems. This failure appears to be an internal failure; here's some
>>>>> additional information (which may only be relevant to an Open MPI
>>>>> developer):
>>>>>
>>>>> orte_grpcomm_modex failed
>>>>> --> Returned "Unreachable" (-12) instead of "Success" (0)
>>>>>
>>>>> --------------------------------------------------------------------------
>>>>> *** The MPI_Init() function was called before MPI_INIT was invoked.
>>>>> *** This is disallowed by the MPI standard.
>>>>> *** Your MPI job will now abort.
>>>>> [c0301b10e1:3172] Abort before MPI_INIT completed successfully; not
>>>>> able to guarantee that all other processes were killed!
>>>>>
>>>>>
>>>>> maybe a related question is how to assign the TCP port range and how
>>>>> is it used? when the processes are on different machines, I use the
>>>>> same range and that's ok as long as the range is free. but when the
>>>>> processes are on the same node, what value should the range be for
>>>>> each process? My range is 10000-12000 (for both processes) and I see
>>>>> that process with rank #0 listen on port 10001 while process with rank
>>>>> #1 try to establish a connect to port 10000.
>>>>>
>>>>> Thanks so much!
>>>>> p. still here... still trying... ;-)
>>>>>
>>>>> On Tue, Jul 27, 2010 at 12:58 AM, Ralph Castain <rhc_at_[hidden]>
>>>>> wrote:
>>>>>> Use what hostname returns - don't worry about IP addresses as we'll
>>>>>> discover them.
>>>>>>
>>>>>> On Jul 26, 2010, at 10:45 PM, Philippe wrote:
>>>>>>
>>>>>>> Thanks a lot!
>>>>>>>
>>>>>>> now, for the ev "OMPI_MCA_orte_nodes", what do I put exactly? our
>>>>>>> nodes have a short/long name (it's rhel 5.x, so the command hostname
>>>>>>> returns the long name) and at least 2 IP addresses.
>>>>>>>
>>>>>>> p.
>>>>>>>
>>>>>>> On Tue, Jul 27, 2010 at 12:06 AM, Ralph Castain <rhc_at_[hidden]>
>>>>>>> wrote:
>>>>>>>> Okay, fixed in r23499. Thanks again...
>>>>>>>>
>>>>>>>>
>>>>>>>> On Jul 26, 2010, at 9:47 PM, Ralph Castain wrote:
>>>>>>>>
>>>>>>>>> Doh - yes it should! I'll fix it right now.
>>>>>>>>>
>>>>>>>>> Thanks!
>>>>>>>>>
>>>>>>>>> On Jul 26, 2010, at 9:28 PM, Philippe wrote:
>>>>>>>>>
>>>>>>>>>> Ralph,
>>>>>>>>>>
>>>>>>>>>> i was able to test the generic module and it seems to be working.
>>>>>>>>>>
>>>>>>>>>> one question tho, the function orte_ess_generic_component_query
>>>>>>>>>> in
>>>>>>>>>> "orte/mca/ess/generic/ess_generic_component.c" calls getenv with
>>>>>>>>>> the
>>>>>>>>>> argument "OMPI_MCA_enc", which seems to cause the module to fail
>>>>>>>>>> to
>>>>>>>>>> load. shouldnt it be "OMPI_MCA_ess" ?
>>>>>>>>>>
>>>>>>>>>> .....
>>>>>>>>>>
>>>>>>>>>> /* only pick us if directed to do so */
>>>>>>>>>> if (NULL != (pick = getenv("OMPI_MCA_env")) &&
>>>>>>>>>> 0 == strcmp(pick, "generic")) {
>>>>>>>>>> *priority = 1000;
>>>>>>>>>> *module = (mca_base_module_t *)&orte_ess_generic_module;
>>>>>>>>>>
>>>>>>>>>> ...
>>>>>>>>>>
>>>>>>>>>> p.
>>>>>>>>>>
>>>>>>>>>> On Thu, Jul 22, 2010 at 5:53 PM, Ralph Castain <rhc_at_[hidden]>
>>>>>>>>>> wrote:
>>>>>>>>>>> Dev trunk looks okay right now - I think you'll be fine using
>>>>>>>>>>> it.
>>>>>>>>>>> My new component -might- work with 1.5, but probably not with
>>>>>>>>>>> 1.4. I haven't
>>>>>>>>>>> checked either of them.
>>>>>>>>>>>
>>>>>>>>>>> Anything at r23478 or above will have the new module. Let me
>>>>>>>>>>> know
>>>>>>>>>>> how it works for you. I haven't tested it myself, but am pretty
>>>>>>>>>>> sure it
>>>>>>>>>>> should work.
>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>> On Jul 22, 2010, at 3:22 PM, Philippe wrote:
>>>>>>>>>>>
>>>>>>>>>>>> Ralph,
>>>>>>>>>>>>
>>>>>>>>>>>> Thank you so much!!
>>>>>>>>>>>>
>>>>>>>>>>>> I'll give it a try and let you know.
>>>>>>>>>>>>
>>>>>>>>>>>> I know it's a tough question, but how stable is the dev trunk?
>>>>>>>>>>>> Can
>>>>>>>>>>>> I
>>>>>>>>>>>> just grab the latest and run, or am I better off taking your
>>>>>>>>>>>> changes
>>>>>>>>>>>> and copy them back in a stable release? (if so, which one? 1.4?
>>>>>>>>>>>> 1.5?)
>>>>>>>>>>>>
>>>>>>>>>>>> p.
>>>>>>>>>>>>
>>>>>>>>>>>> On Thu, Jul 22, 2010 at 3:50 PM, Ralph Castain
>>>>>>>>>>>> <rhc_at_[hidden]>
>>>>>>>>>>>> wrote:
>>>>>>>>>>>>> It was easier for me to just construct this module than to
>>>>>>>>>>>>> explain how to do so :-)
>>>>>>>>>>>>>
>>>>>>>>>>>>> I will commit it this evening (couple of hours from now) as
>>>>>>>>>>>>> that
>>>>>>>>>>>>> is our standard practice. You'll need to use the developer's
>>>>>>>>>>>>> trunk, though,
>>>>>>>>>>>>> to use it.
>>>>>>>>>>>>>
>>>>>>>>>>>>> Here are the envars you'll need to provide:
>>>>>>>>>>>>>
>>>>>>>>>>>>> Each process needs to get the same following values:
>>>>>>>>>>>>>
>>>>>>>>>>>>> * OMPI_MCA_ess=generic
>>>>>>>>>>>>> * OMPI_MCA_orte_num_procs=<number of MPI procs>
>>>>>>>>>>>>> * OMPI_MCA_orte_nodes=<a comma-separated list of nodenames
>>>>>>>>>>>>> where
>>>>>>>>>>>>> MPI procs reside>
>>>>>>>>>>>>> * OMPI_MCA_orte_ppn=<number of procs/node>
>>>>>>>>>>>>>
>>>>>>>>>>>>> Note that I have assumed this last value is a constant for
>>>>>>>>>>>>> simplicity. If that isn't the case, let me know - you could
>>>>>>>>>>>>> instead provide
>>>>>>>>>>>>> it as a comma-separated list of values with an entry for each
>>>>>>>>>>>>> node.
>>>>>>>>>>>>>
>>>>>>>>>>>>> In addition, you need to provide the following value that will
>>>>>>>>>>>>> be
>>>>>>>>>>>>> unique to each process:
>>>>>>>>>>>>>
>>>>>>>>>>>>> * OMPI_MCA_orte_rank=<MPI rank>
>>>>>>>>>>>>>
>>>>>>>>>>>>> Finally, you have to provide a range of static TCP ports for
>>>>>>>>>>>>> use
>>>>>>>>>>>>> by the processes. Pick any range that you know will be
>>>>>>>>>>>>> available across all
>>>>>>>>>>>>> the nodes. You then need to ensure that each process sees the
>>>>>>>>>>>>> following
>>>>>>>>>>>>> envar:
>>>>>>>>>>>>>
>>>>>>>>>>>>> * OMPI_MCA_oob_tcp_static_ports=6000-6010 <== obviously,
>>>>>>>>>>>>> replace
>>>>>>>>>>>>> this with your range
>>>>>>>>>>>>>
>>>>>>>>>>>>> You will need a port range that is at least equal to the ppn
>>>>>>>>>>>>> for
>>>>>>>>>>>>> the job (each proc on a node will take one of the provided
>>>>>>>>>>>>> ports).
>>>>>>>>>>>>>
>>>>>>>>>>>>> That should do it. I compute everything else I need from those
>>>>>>>>>>>>> values.
>>>>>>>>>>>>>
>>>>>>>>>>>>> Does that work for you?
>>>>>>>>>>>>> Ralph
>>>>>>>>>>>>>
>>>>>>>>>>>>>
>>>>>>>
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>>>>>>
>>>>>>
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