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Subject: Re: [OMPI users] Fwd: Open MPI v1.4 cant find default hostfile
From: Mario Ogrizek (mario.guardian_at_[hidden])
Date: 2010-04-17 13:17:50


Hahaha, ok then that WAS silly! :D
So there is no way to utilize both cores with mpi?

Ah well, I'll correct that.

>From console, im starting a job like this: mpirun -np 4 Program, where i
want to run a Program on 4 processors.
I was just stumbled when i got same output 4 times, like there are 4
processes ranked 0.
While with the old version of mpi (1.2) same execution would give 4
processes ranked 0..3.

Hope you see my question.

On Sat, Apr 17, 2010 at 6:29 PM, Ralph Castain <rhc_at_[hidden]> wrote:

>
> On Apr 17, 2010, at 1:16 AM, Mario Ogrizek wrote:
>
> I am new to mpi, so I'm sorry for any silly questions.
>
> My idea was to try to use dual core machine as two nodes. I have a limited
> access to a cluster, so this was just for "testing" purposes.
> My default hostfile contains usual comments and this two nodes:
>
> node0
> node1
>
> I thought that each processor is a node for MPI purpose.
>
>
> I'm afraid not - it is just another processor on that node. So you only
> have one node as far as OMPI is concerned.
>
> Im not sure what do you mean with "mpirun cmd line"?
>
>
> How are you starting your job? The usual way is with "mpirun -n N ...".
> That is what we mean by the "mpirun cmd line" - i.e., what command are you
> using to start your job?
>
> It sounds like things are actually working correctly. You might look at
> "mpirun -h" for possible options of interest.
>
>
>
> Regards,
>
> Mario
>
> On Sat, Apr 17, 2010 at 1:54 AM, Ralph Castain <rhc_at_[hidden]> wrote:
>
>>
>> On Apr 16, 2010, at 5:08 PM, Mario Ogrizek wrote:
>>
>> I checked the default MCA param file, and found it was there that was
>> (automatically) specified as a relative path, so i changed it.
>> So now, it works, altho, still something is not right.
>> Seems like its creating 4 times only 1 process.
>> Not sure if it has to do something with my hostfile, it contains:
>>
>> node0
>> node1
>>
>> I am running this on a simple dualcore machine, so i specified it as a
>> localhost with two nodes.
>>
>>
>> I don't understand this comment - a dual core machine would still be a
>> single node. Just happens to have two processors in it.
>>
>> Could you send the contents of your hostfile and your mpirun cmd line?
>>
>>
>> Regards,
>>
>> Mario
>>
>> On Sat, Apr 17, 2010 at 12:52 AM, Mario Ogrizek <mario.guardian_at_[hidden]
>> > wrote:
>>
>>> I understand, so, its looking for a
>>> working_dir/usr/local/etc/openmpi-default-hostfile
>>> I managed to run a hello world program from the console, while my wd was
>>> just "/" and it worked, altho strangely...
>>> example for 4 procs:
>>>
>>> Hello MPI World From process 0: Num processes: 1
>>> Hello MPI World From process 0: Num processes: 1
>>> Hello MPI World From process 0: Num processes: 1
>>> Hello MPI World From process 0: Num processes: 1
>>>
>>> So, you are saying i allways have to be in "/" to run mpi programs, or
>>> there is a way for mpi to search absolute path?
>>> It seems pretty inconvinient this way.
>>> I think v 1.2 didnt have this limitation.
>>>
>>> Does this have to do anything with LD_LIBRARY_PATH?
>>>
>>> Regards,
>>>
>>> Mario
>>>
>>> On Fri, Apr 16, 2010 at 7:46 PM, Ralph Castain <rhc_at_[hidden]> wrote:
>>>
>>>> How did you specify it? Command line? Default MCA param file?
>>>>
>>>> On Apr 16, 2010, at 11:44 AM, Mario Ogrizek wrote:
>>>>
>>>> Any idea how to solve this?
>>>>
>>>> On Fri, Apr 16, 2010 at 7:40 PM, Timur Magomedov <
>>>> timur.magomedov_at_[hidden]> wrote:
>>>>
>>>>> Hello.
>>>>> It looks that you hostfile path should
>>>>> be /usr/local/etc/openmpi-default-hostfile not
>>>>> usr/local/etc/openmpi-default-hostfile but somehow Open MPI gets the
>>>>> second path.
>>>>>
>>>>> В Птн, 16/04/2010 в 19:10 +0200, Mario Ogrizek пишет:
>>>>> > Well, im not sure why should i name it /openmpi-default-hostfile
>>>>> > Especially, because mpirun v1.2 executes without any errors.
>>>>> > But, i made a copy named /openmpi-default-hostfile, and still, the
>>>>> > same result.
>>>>> >
>>>>> > This is the whole error message for a simple hello world program:
>>>>> >
>>>>> >
>>>>> > Open RTE was unable to open the hostfile:
>>>>> > usr/local/etc/openmpi-default-hostfile
>>>>> > Check to make sure the path and filename are correct.
>>>>> >
>>>>> --------------------------------------------------------------------------
>>>>> > [Mario.local:04300] [[114,0],0] ORTE_ERROR_LOG: Not found in file
>>>>> > base/ras_base_allocate.c at line 186
>>>>> > [Mario.local:04300] [[114,0],0] ORTE_ERROR_LOG: Not found in file
>>>>> > base/plm_base_launch_support.c at line 72
>>>>> > [Mario.local:04300] [[114,0],0] ORTE_ERROR_LOG: Not found in file
>>>>> > plm_rsh_module.c at line 990
>>>>> >
>>>>> --------------------------------------------------------------------------
>>>>> > A daemon (pid unknown) died unexpectedly on signal 1 while
>>>>> attempting
>>>>> > to
>>>>> > launch so we are aborting.
>>>>> >
>>>>> >
>>>>> > There may be more information reported by the environment (see
>>>>> above).
>>>>> >
>>>>> >
>>>>> > This may be because the daemon was unable to find all the needed
>>>>> > shared
>>>>> > libraries on the remote node. You may set your LD_LIBRARY_PATH to
>>>>> have
>>>>> > the
>>>>> > location of the shared libraries on the remote nodes and this will
>>>>> > automatically be forwarded to the remote nodes.
>>>>> >
>>>>> --------------------------------------------------------------------------
>>>>> >
>>>>> --------------------------------------------------------------------------
>>>>> > mpirun noticed that the job aborted, but has no info as to the
>>>>> process
>>>>> > that caused that situation.
>>>>> >
>>>>> --------------------------------------------------------------------------
>>>>> > mpirun: clean termination accomplished
>>>>> >
>>>>> >
>>>>> >
>>>>> >
>>>>> > ps. PTP is a parallel tools platform plugin for eclipse
>>>>> >
>>>>> >
>>>>> > Regards,
>>>>> >
>>>>> >
>>>>> > Mario
>>>>> >
>>>>> > _______________________________________________
>>>>> > users mailing list
>>>>> > users_at_[hidden]
>>>>> > http://www.open-mpi.org/mailman/listinfo.cgi/users
>>>>>
>>>>>
>>>>> --
>>>>> Kind regards,
>>>>> Timur Magomedov
>>>>> Senior C++ Developer
>>>>> DevelopOnBox LLC / Zodiac Interactive
>>>>> http://www.zodiac.tv/
>>>>>
>>>>> _______________________________________________
>>>>> users mailing list
>>>>> users_at_[hidden]
>>>>> http://www.open-mpi.org/mailman/listinfo.cgi/users
>>>>
>>>>
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