On Nov 27, 2009, at 8:23 AM, Sylvain Jeaugey wrote:
> Hi Ralph,
>
> I tried with the trunk and it makes no difference for me.
Strange
>
> Looking at potential differences, I found out something strange. The bug may
> have something to do with the "routed" framework. I can reproduce the bug
> with binomial and direct, but not with cm and linear (you disabled the build
> of the latest in your configure options -- why ?).
You won't with cm because there is no relay. Likewise, direct doesn't have a
relay - so I'm really puzzled how you can see this behavior when using the
direct component???
I disable components in my build to save memory. Every component we open costs
us memory that may or may not be recoverable during the course of execution.
>
> Btw, all components have a 0 priority and none is defined to be the default
> component. Which one is the default then ? binomial (as the first in
> alphabetical order) ?
I believe you must have a severely corrupted version of the code. The binomial
component has priority 70 so it will be selected as the default.
Linear has priority 40, though it will only be selected if you say ^binomial.
CM and radix have special selection code in them so they will only be selected
when specified.
Direct and slave have priority 0 to ensure they will only be selected when
specified
>
> Can you check which one you are using and try with binomial explicitely
> chosen ?
I am using binomial for all my tests
>From what you are describing, I think you either have a corrupted copy of the
>code, are picking up mis-matched versions, or something strange as your
>experiences don't match what anyone else is seeing.
Remember, the phase you are discussing here has nothing to do with the native
launch environment. This is dealing with the relative timing of the application
launch versus relaying the launch message itself - i.e., the daemons are
already up and running before any of this starts. Thus, this "problem" has
nothing to do with how we launch the daemons. So, if it truly were a problem in
the code, we would see it on every environment - torque, slurm, ssh, etc.
We routinely launch jobs spanning hundreds to thousands of nodes without
problem. If this timing problem was as you have identified, then we would see
this constantly. Yet nobody is seeing it, and I cannot reproduce it even with
your reproducer.
I honestly don't know what to suggest at this point. Any chance you are picking
up mis-matched OMPI versions are your backend nodes or something? Tried fresh
checkouts of the code? Is this a code base you have modified, or are you seeing
this with the "stock" code from the repo?
Just fishing at this point - can't find anything wrong! :-/
Ralph
>
> Thanks for your time,
> Sylvain
>
> On Thu, 26 Nov 2009, Ralph Castain wrote:
>
>> Hi Sylvain
>>
>> Well, I hate to tell you this, but I cannot reproduce the "bug" even with
>> this code in ORTE no matter what value of ORTE_RELAY_DELAY I use. The system
>> runs really slow as I increase the delay, but it completes the job just
>> fine. I ran jobs across 16 nodes on a slurm machine, 1-4 ppn, a "hello
>> world" app that calls MPI_Init immediately upon execution.
>>
>> So I have to conclude this is a problem in your setup/config. Are you sure
>> you didn't --enable-progress-threads?? That is the only way I can recreate
>> this behavior.
>>
>> I plan to modify the relay/message processing method anyway to clean it up.
>> But there doesn't appear to be anything wrong with the current code.
>> Ralph
>>
>> On Nov 20, 2009, at 6:55 AM, Sylvain Jeaugey wrote:
>>
>>> Hi Ralph,
>>>
>>> Thanks for your efforts. I will look at our configuration and see how it
>>> may differ from ours.
>>>
>>> Here is a patch which helps reproducing the bug even with a small number of
>>> nodes.
>>>
>>> diff -r b622b9e8f1ac orte/orted/orted_comm.c
>>> --- a/orte/orted/orted_comm.c Wed Nov 18 09:27:55 2009 +0100
>>> +++ b/orte/orted/orted_comm.c Fri Nov 20 14:47:39 2009 +0100
>>> @@ -126,6 +126,13 @@
>>> ORTE_ERROR_LOG(ret);
>>> goto CLEANUP;
>>> }
>>> + { /* Add delay to reproduce bug */
>>> + char * str = getenv("ORTE_RELAY_DELAY");
>>> + int sec = str ? atoi(str) : 0;
>>> + if (sec) {
>>> + sleep(sec);
>>> + }
>>> + }
>>> }
>>>
>>> CLEANUP:
>>>
>>> Just set ORTE_RELAY_DELAY to 1 (second) and you should reproduce the bug.
>>>
>>> During our experiments, the bug disappeared when we added a delay before
>>> calling MPI_Init. So, configurations where processes are launched slowly or
>>> take some time before MPI_Init should be immune to this bug.
>>>
>>> We usually reproduce the bug with one ppn (faster to spawn).
>>>
>>> Sylvain
>>>
>>> On Thu, 19 Nov 2009, Ralph Castain wrote:
>>>
>>>> Hi Sylvain
>>>>
>>>> I've spent several hours trying to replicate the behavior you described on
>>>> clusters up to a couple of hundred nodes (all running slurm), without
>>>> success. I'm becoming increasingly convinced that this is a configuration
>>>> issue as opposed to a code issue.
>>>>
>>>> I have enclosed the platform file I use below. Could you compare it to
>>>> your configuration? I'm wondering if there is something critical about the
>>>> config that may be causing the problem (perhaps we have a problem in our
>>>> default configuration).
>>>>
>>>> Also, is there anything else you can tell us about your configuration? How
>>>> many ppn triggers it, or do you always get the behavior every time you
>>>> launch over a certain number of nodes?
>>>>
>>>> Meantime, I will look into this further. I am going to introduce a "slow
>>>> down" param that will force the situation you encountered - i.e., will
>>>> ensure that the relay is still being sent when the daemon receives the
>>>> first collective input. We can then use that to try and force replication
>>>> of the behavior you are encountering.
>>>>
>>>> Thanks
>>>> Ralph
>>>>
>>>> enable_dlopen=no
>>>> enable_pty_support=no
>>>> with_blcr=no
>>>> with_openib=yes
>>>> with_memory_manager=no
>>>> enable_mem_debug=yes
>>>> enable_mem_profile=no
>>>> enable_debug_symbols=yes
>>>> enable_binaries=yes
>>>> with_devel_headers=yes
>>>> enable_heterogeneous=no
>>>> enable_picky=yes
>>>> enable_debug=yes
>>>> enable_shared=yes
>>>> enable_static=yes
>>>> with_slurm=yes
>>>> enable_contrib_no_build=libnbc,vt
>>>> enable_visibility=yes
>>>> enable_memchecker=no
>>>> enable_ipv6=no
>>>> enable_mpi_f77=no
>>>> enable_mpi_f90=no
>>>> enable_mpi_cxx=no
>>>> enable_mpi_cxx_seek=no
>>>> enable_mca_no_build=pml-dr,pml-crcp2,crcp
>>>> enable_io_romio=no
>>>>
>>>> On Nov 19, 2009, at 8:08 AM, Ralph Castain wrote:
>>>>
>>>>>
>>>>> On Nov 19, 2009, at 7:52 AM, Sylvain Jeaugey wrote:
>>>>>
>>>>>> Thank you Ralph for this precious help.
>>>>>>
>>>>>> I setup a quick-and-dirty patch basically postponing process_msg (hence
>>>>>> daemon_collective) until the launch is done. In process_msg, I therefore
>>>>>> requeue a process_msg handler and return.
>>>>>
>>>>> That is basically the idea I proposed, just done in a slightly different
>>>>> place
>>>>>
>>>>>>
>>>>>> In this "all-must-be-non-blocking-and-done-through-opal_progress"
>>>>>> algorithm, I don't think that blocking calls like the one in
>>>>>> daemon_collective should be allowed. This also applies to the blocking
>>>>>> one in send_relay. [Well, actually, one is okay, 2 may lead to
>>>>>> interlocking.]
>>>>>
>>>>> Well, that would be problematic - you will find "progressed_wait" used
>>>>> repeatedly in the code. Removing them all would take a -lot- of effort
>>>>> and a major rewrite. I'm not yet convinced it is required. There may be
>>>>> something strange in how you are setup, or your cluster - like I said,
>>>>> this is the first report of a problem we have had, and people with much
>>>>> bigger slurm clusters have been running this code every day for over a
>>>>> year.
>>>>>
>>>>>>
>>>>>> If you have time doing a nicer patch, it would be great and I would be
>>>>>> happy to test it. Otherwise, I will try to implement your idea properly
>>>>>> next week (with my limited knowledge of orted).
>>>>>
>>>>> Either way is fine - I'll see if I can get to it.
>>>>>
>>>>> Thanks
>>>>> Ralph
>>>>>
>>>>>>
>>>>>> For the record, here is the patch I'm currently testing at large scale :
>>>>>>
>>>>>> diff -r ec68298b3169 -r b622b9e8f1ac
>>>>>> orte/mca/grpcomm/bad/grpcomm_bad_module.c
>>>>>> --- a/orte/mca/grpcomm/bad/grpcomm_bad_module.c Mon Nov 09 13:29:16 2009
>>>>>> +0100
>>>>>> +++ b/orte/mca/grpcomm/bad/grpcomm_bad_module.c Wed Nov 18 09:27:55 2009
>>>>>> +0100
>>>>>> @@ -687,14 +687,6 @@
>>>>>> opal_list_append(&orte_local_jobdata, &jobdat->super);
>>>>>> }
>>>>>>
>>>>>> - /* it may be possible to get here prior to having actually finished
>>>>>> processing our
>>>>>> - * local launch msg due to the race condition between different
>>>>>> nodes and when
>>>>>> - * they start their individual procs. Hence, we have to first
>>>>>> ensure that we
>>>>>> - * -have- finished processing the launch msg, or else we won't know
>>>>>> whether
>>>>>> - * or not to wait before sending this on
>>>>>> - */
>>>>>> - ORTE_PROGRESSED_WAIT(jobdat->launch_msg_processed, 0, 1);
>>>>>> -
>>>>>> /* unpack the collective type */
>>>>>> n = 1;
>>>>>> if (ORTE_SUCCESS != (rc = opal_dss.unpack(data,
>>>>>> &jobdat->collective_type, &n, ORTE_GRPCOMM_COLL_T))) {
>>>>>> @@ -894,6 +886,28 @@
>>>>>>
>>>>>> proc = &mev->sender;
>>>>>> buf = mev->buffer;
>>>>>> +
>>>>>> + jobdat = NULL;
>>>>>> + for (item = opal_list_get_first(&orte_local_jobdata);
>>>>>> + item != opal_list_get_end(&orte_local_jobdata);
>>>>>> + item = opal_list_get_next(item)) {
>>>>>> + jobdat = (orte_odls_job_t*)item;
>>>>>> +
>>>>>> + /* is this the specified job? */
>>>>>> + if (jobdat->jobid == proc->jobid) {
>>>>>> + break;
>>>>>> + }
>>>>>> + }
>>>>>> + if (NULL == jobdat || jobdat->launch_msg_processed != 1) {
>>>>>> + /* it may be possible to get here prior to having actually
>>>>>> finished processing our
>>>>>> + * local launch msg due to the race condition between different
>>>>>> nodes and when
>>>>>> + * they start their individual procs. Hence, we have to first
>>>>>> ensure that we
>>>>>> + * -have- finished processing the launch msg. Requeue this
>>>>>> event until it is done.
>>>>>> + */
>>>>>> + int tag = &mev->tag;
>>>>>> + ORTE_MESSAGE_EVENT(proc, buf, tag, process_msg);
>>>>>> + return;
>>>>>> + }
>>>>>>
>>>>>> /* is the sender a local proc, or a daemon relaying the collective? */
>>>>>> if (ORTE_PROC_MY_NAME->jobid == proc->jobid) {
>>>>>>
>>>>>> Sylvain
>>>>>>
>>>>>> On Thu, 19 Nov 2009, Ralph Castain wrote:
>>>>>>
>>>>>>> Very strange. As I said, we routinely launch jobs spanning several
>>>>>>> hundred nodes without problem. You can see the platform files for that
>>>>>>> setup in contrib/platform/lanl/tlcc
>>>>>>>
>>>>>>> That said, it is always possible you are hitting some kind of race
>>>>>>> condition we don't hit. In looking at the code, one possibility would
>>>>>>> be to make all the communications flow through the daemon cmd processor
>>>>>>> in orte/orted_comm.c. This is the way it used to work until I
>>>>>>> reorganized the code a year ago for other reasons that never
>>>>>>> materialized.
>>>>>>>
>>>>>>> Unfortunately, the daemon collective has to wait until the local launch
>>>>>>> cmd has been completely processed so it can know whether or not to wait
>>>>>>> for contributions from local procs before sending along the collective
>>>>>>> message, so this kinda limits our options.
>>>>>>>
>>>>>>> About the only other thing you could do would be to not send the relay
>>>>>>> at all until -after- processing the local launch cmd. You can then
>>>>>>> remove the "wait" in the daemon collective as you will know how many
>>>>>>> local procs are involved, if any.
>>>>>>>
>>>>>>> I used to do it that way and it guarantees it will work. The negative
>>>>>>> is that we lose some launch speed as the next nodes in the tree don't
>>>>>>> get the launch message until this node finishes launching all its procs.
>>>>>>>
>>>>>>> The way around that, of course, would be to:
>>>>>>>
>>>>>>> 1. process the launch message, thus extracting the number of any local
>>>>>>> procs and setting up all data structures...but do -not- launch the
>>>>>>> procs at this time (as this is what takes all the time)
>>>>>>>
>>>>>>> 2. send the relay - the daemon collective can now proceed without a
>>>>>>> "wait" in it
>>>>>>>
>>>>>>> 3. now launch the local procs
>>>>>>>
>>>>>>> It would be a fairly simple reorganization of the code in the
>>>>>>> orte/mca/odls area. I can do it this weekend if you like, or you can do
>>>>>>> it - either way is fine, but if you do it, please contribute it back to
>>>>>>> the trunk.
>>>>>>>
>>>>>>> Ralph
>>>>>>>
>>>>>>>
>>>>>>> On Nov 19, 2009, at 1:39 AM, Sylvain Jeaugey wrote:
>>>>>>>
>>>>>>>> I would say I use the default settings, i.e. I don't set anything
>>>>>>>> "special" at configure.
>>>>>>>>
>>>>>>>> I'm launching my processes with SLURM (salloc + mpirun).
>>>>>>>>
>>>>>>>> Sylvain
>>>>>>>>
>>>>>>>> On Wed, 18 Nov 2009, Ralph Castain wrote:
>>>>>>>>
>>>>>>>>> How did you configure OMPI?
>>>>>>>>>
>>>>>>>>> What launch mechanism are you using - ssh?
>>>>>>>>>
>>>>>>>>> On Nov 17, 2009, at 9:01 AM, Sylvain Jeaugey wrote:
>>>>>>>>>
>>>>>>>>>> I don't think so, and I'm not doing it explicitely at least. How do
>>>>>>>>>> I know ?
>>>>>>>>>>
>>>>>>>>>> Sylvain
>>>>>>>>>>
>>>>>>>>>> On Tue, 17 Nov 2009, Ralph Castain wrote:
>>>>>>>>>>
>>>>>>>>>>> We routinely launch across thousands of nodes without a problem...I
>>>>>>>>>>> have never seen it stick in this fashion.
>>>>>>>>>>>
>>>>>>>>>>> Did you build and/or are using ORTE threaded by any chance? If so,
>>>>>>>>>>> that definitely won't work.
>>>>>>>>>>>
>>>>>>>>>>> On Nov 17, 2009, at 9:27 AM, Sylvain Jeaugey wrote:
>>>>>>>>>>>
>>>>>>>>>>>> Hi all,
>>>>>>>>>>>>
>>>>>>>>>>>> We are currently experiencing problems at launch on the 1.5 branch
>>>>>>>>>>>> on relatively large number of nodes (at least 80). Some processes
>>>>>>>>>>>> are not spawned and orted processes are deadlocked.
>>>>>>>>>>>>
>>>>>>>>>>>> When MPI processes are calling MPI_Init before send_relay is
>>>>>>>>>>>> complete, the send_relay function and the daemon_collective
>>>>>>>>>>>> function are doing a nice interlock :
>>>>>>>>>>>>
>>>>>>>>>>>> Here is the scenario :
>>>>>>>>>>>>> send_relay
>>>>>>>>>>>> performs the send tree :
>>>>>>>>>>>>> orte_rml_oob_send_buffer
>>>>>>>>>>>>> orte_rml_oob_send
>>>>>>>>>>>>> opal_wait_condition
>>>>>>>>>>>> Waiting on completion from send thus calling opal_progress()
>>>>>>>>>>>>> opal_progress()
>>>>>>>>>>>> But since a collective request arrived from the network, entered :
>>>>>>>>>>>>> daemon_collective
>>>>>>>>>>>> However, daemon_collective is waiting for the job to be
>>>>>>>>>>>> initialized (wait on jobdat->launch_msg_processed) before
>>>>>>>>>>>> continuing, thus calling :
>>>>>>>>>>>>> opal_progress()
>>>>>>>>>>>>
>>>>>>>>>>>> At this time, the send may complete, but since we will never go
>>>>>>>>>>>> back to orte_rml_oob_send, we will never perform the launch
>>>>>>>>>>>> (setting jobdat->launch_msg_processed to 1).
>>>>>>>>>>>>
>>>>>>>>>>>> I may try to solve the bug (this is quite a top priority problem
>>>>>>>>>>>> for me), but maybe people who are more familiar with orted than I
>>>>>>>>>>>> am may propose a nice and clean solution ...
>>>>>>>>>>>>
>>>>>>>>>>>> For those who like real (and complete) gdb stacks, here they are :
>>>>>>>>>>>> #0 0x0000003b7fed4f38 in poll () from /lib64/libc.so.6
>>>>>>>>>>>> #1 0x00007fd0de5d861a in poll_dispatch (base=0x930230,
>>>>>>>>>>>> arg=0x91a4b0, tv=0x7fff0d977880) at poll.c:167
>>>>>>>>>>>> #2 0x00007fd0de5d586f in opal_event_base_loop (base=0x930230,
>>>>>>>>>>>> flags=1) at event.c:823
>>>>>>>>>>>> #3 0x00007fd0de5d556b in opal_event_loop (flags=1) at event.c:746
>>>>>>>>>>>> #4 0x00007fd0de5aeb6d in opal_progress () at
>>>>>>>>>>>> runtime/opal_progress.c:189
>>>>>>>>>>>> #5 0x00007fd0dd340a02 in daemon_collective (sender=0x97af50,
>>>>>>>>>>>> data=0x97b010) at grpcomm_bad_module.c:696
>>>>>>>>>>>> #6 0x00007fd0dd341809 in process_msg (fd=-1, opal_event=1,
>>>>>>>>>>>> data=0x97af20) at grpcomm_bad_module.c:901
>>>>>>>>>>>> #7 0x00007fd0de5d5334 in event_process_active (base=0x930230) at
>>>>>>>>>>>> event.c:667
>>>>>>>>>>>> #8 0x00007fd0de5d597a in opal_event_base_loop (base=0x930230,
>>>>>>>>>>>> flags=1) at event.c:839
>>>>>>>>>>>> #9 0x00007fd0de5d556b in opal_event_loop (flags=1) at event.c:746
>>>>>>>>>>>> #10 0x00007fd0de5aeb6d in opal_progress () at
>>>>>>>>>>>> runtime/opal_progress.c:189
>>>>>>>>>>>> #11 0x00007fd0dd340a02 in daemon_collective (sender=0x979700,
>>>>>>>>>>>> data=0x9676e0) at grpcomm_bad_module.c:696
>>>>>>>>>>>> #12 0x00007fd0dd341809 in process_msg (fd=-1, opal_event=1,
>>>>>>>>>>>> data=0x9796d0) at grpcomm_bad_module.c:901
>>>>>>>>>>>> #13 0x00007fd0de5d5334 in event_process_active (base=0x930230) at
>>>>>>>>>>>> event.c:667
>>>>>>>>>>>> #14 0x00007fd0de5d597a in opal_event_base_loop (base=0x930230,
>>>>>>>>>>>> flags=1) at event.c:839
>>>>>>>>>>>> #15 0x00007fd0de5d556b in opal_event_loop (flags=1) at event.c:746
>>>>>>>>>>>> #16 0x00007fd0de5aeb6d in opal_progress () at
>>>>>>>>>>>> runtime/opal_progress.c:189
>>>>>>>>>>>> #17 0x00007fd0dd340a02 in daemon_collective (sender=0x97b420,
>>>>>>>>>>>> data=0x97b4e0) at grpcomm_bad_module.c:696
>>>>>>>>>>>> #18 0x00007fd0dd341809 in process_msg (fd=-1, opal_event=1,
>>>>>>>>>>>> data=0x97b3f0) at grpcomm_bad_module.c:901
>>>>>>>>>>>> #19 0x00007fd0de5d5334 in event_process_active (base=0x930230) at
>>>>>>>>>>>> event.c:667
>>>>>>>>>>>> #20 0x00007fd0de5d597a in opal_event_base_loop (base=0x930230,
>>>>>>>>>>>> flags=1) at event.c:839
>>>>>>>>>>>> #21 0x00007fd0de5d556b in opal_event_loop (flags=1) at event.c:746
>>>>>>>>>>>> #22 0x00007fd0de5aeb6d in opal_progress () at
>>>>>>>>>>>> runtime/opal_progress.c:189
>>>>>>>>>>>> #23 0x00007fd0dd969a8a in opal_condition_wait (c=0x97b210,
>>>>>>>>>>>> m=0x97b1a8) at ../../../../opal/threads/condition.h:99
>>>>>>>>>>>> #24 0x00007fd0dd96a4bf in orte_rml_oob_send (peer=0x7fff0d9785a0,
>>>>>>>>>>>> iov=0x7fff0d978530, count=1, tag=1, flags=16) at rml_oob_send.c:153
>>>>>>>>>>>> #25 0x00007fd0dd96ac4d in orte_rml_oob_send_buffer
>>>>>>>>>>>> (peer=0x7fff0d9785a0, buffer=0x7fff0d9786b0, tag=1, flags=0) at
>>>>>>>>>>>> rml_oob_send.c:270
>>>>>>>>>>>> #26 0x00007fd0de86ed2a in send_relay (buf=0x7fff0d9786b0) at
>>>>>>>>>>>> orted/orted_comm.c:127
>>>>>>>>>>>> #27 0x00007fd0de86f6de in orte_daemon_cmd_processor (fd=-1,
>>>>>>>>>>>> opal_event=1, data=0x965fc0) at orted/orted_comm.c:308
>>>>>>>>>>>> #28 0x00007fd0de5d5334 in event_process_active (base=0x930230) at
>>>>>>>>>>>> event.c:667
>>>>>>>>>>>> #29 0x00007fd0de5d597a in opal_event_base_loop (base=0x930230,
>>>>>>>>>>>> flags=0) at event.c:839
>>>>>>>>>>>> #30 0x00007fd0de5d556b in opal_event_loop (flags=0) at event.c:746
>>>>>>>>>>>> #31 0x00007fd0de5d5418 in opal_event_dispatch () at event.c:682
>>>>>>>>>>>> #32 0x00007fd0de86e339 in orte_daemon (argc=19,
>>>>>>>>>>>> argv=0x7fff0d979ca8) at orted/orted_main.c:769
>>>>>>>>>>>> #33 0x00000000004008e2 in main (argc=19, argv=0x7fff0d979ca8) at
>>>>>>>>>>>> orted.c:62
>>>>>>>>>>>>
>>>>>>>>>>>> Thanks in advance,
>>>>>>>>>>>> Sylvain
>>>>>>>>>>>> _______________________________________________
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>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>> _______________________________________________
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>>>>>>>>>
>>>>>>>>> _______________________________________________
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>>>>>>>>>
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>>>>>>>
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