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Subject: Re: [OMPI users] openmpi 1.4 broken -mca coll_tuned_use_dynamic_rules 1
From: Lenny Verkhovsky (lenny.verkhovsky_at_[hidden])
Date: 2009-12-30 10:44:52


it may crash if it doesnt see a file with rules.
try providing it through the command line
$mpirun -mca coll_tuned_use_dynamic_rules 1 -mca
coll_tuned_dynamic_rules_filename full_path_to_file_ .....

On Wed, Dec 30, 2009 at 5:35 PM, Daniel Spångberg <daniels_at_[hidden]>wrote:

> Thanks for the help with how to set up the collectives file. I am unable to
> make it work though,
>
> My simple alltoall test is still crashing, although I added even added a
> line specifically for my test commsize of 64 and 100 bytes using bruck.
>
> daniels_at_kalkyl1:~/.openmpi > cat mca-params.conf
>
> coll_tuned_use_dynamic_rules=1
> coll_base_verbose=0
>
> coll_tuned_dynamic_rules_filename="/home/daniels/.openmpi/dynamic_rules_file"
> daniels_at_kalkyl1:~/.openmpi > cat dynamic_rules_file
>
> 1 # num of collectives
> 3 # ID = 3 Alltoall collective (ID in coll_tuned.h)
> 1 # number of com sizes
> 64 # comm size 64
> 3 # number of msg sizes
> 0 3 0 0 # for message size 0, bruck 1, topo 0, 0 segmentation
> 100 3 0 0 # for message size 100, bruck 1, topo 0, 0 segmentation
>
> 8192 2 0 0 # 8k+, pairwise 2, no topo or segmentation
> # end of collective rule
>
> Still it useful to know how to do this, when this issue gets fixed in the
> future!
>
> Daniel
>
>
>
> Den 2009-12-30 15:57:50 skrev Lenny Verkhovsky <lenny.verkhovsky_at_[hidden]
> >:
>
>
> The only workaround that I found is a file with dynamic rules.
>> This is an example that George sent me once. It helped for me, until it
>> will
>> be fixed.
>>
>> " Lenny,
>>
>> You asked for dynamic rules but it looks like you didn't provide them.
>> Dynamic rules allow the user to specify which algorithm to be used for
>> each
>> collective based on a set of rules. I corrected the current behavior, so
>> it
>> will not crash. However, as you didn't provide dynamic rules, it will just
>> switch back to default behavior (i.e. ignore the
>> coll_tuned_use_dynamic_rules MCA parameter).
>>
>> As an example, here is a set of dynamic rules. I added some comment to
>> clarify it, but if you have any questions please ask.
>>
>> 2 # num of collectives
>> 3 # ID = 3 Alltoall collective (ID in coll_tuned.h)
>> 1 # number of com sizes
>> 64 # comm size 64
>> 2 # number of msg sizes
>> 0 3 0 0 # for message size 0, bruck 1, topo 0, 0 segmentation
>> 8192 2 0 0 # 8k+, pairwise 2, no topo or segmentation
>> # end of collective rule
>> #
>> 2 # ID = 2 Allreduce collective (ID in coll_tuned.h)
>> 1 # number of com sizes
>> 1 # comm size 2
>> 2 # number of msg sizes
>> 0 1 0 0 # for message size 0, basic linear 1, topo 0, 0 segmentation
>> 1024 2 0 0 # for messages size > 1024, nonoverlapping 2, topo 0, 0
>> segmentation
>> # end of collective rule
>> #
>>
>> And here is what I have in my $(HOME)/.openmpi/mca-params.conf to activate
>> them:
>> #
>> # Dealing with collective
>> #
>> coll_base_verbose = 0
>>
>> coll_tuned_use_dynamic_rules = 1
>> coll_tuned_dynamic_rules_filename = **the name of the file where you saved
>> the rules **
>>
>> "
>>
>> On Wed, Dec 30, 2009 at 4:44 PM, Daniel Spångberg <daniels_at_[hidden]
>> >wrote:
>>
>> Interesting. I found your issue before I sent my report, but I did not
>>> realise that this was the same problem. I see now that your example is
>>> really for openmpi 1.3.4++
>>>
>>> Do you know of a work around? I have not used a rule file before and seem
>>> to be unable to find the documentation for how to use one, unfortunately.
>>>
>>> Daniel
>>>
>>> Den 2009-12-30 15:17:17 skrev Lenny Verkhovsky <
>>> lenny.verkhovsky_at_[hidden]
>>> >:
>>>
>>>
>>> This is the a knowing issue,
>>>
>>>> https://svn.open-mpi.org/trac/ompi/ticket/2087
>>>> Maybe it's priority should be raised up.
>>>> Lenny.
>>>>
>>>> _______________________________________________
>>> users mailing list
>>> users_at_[hidden]
>>> http://www.open-mpi.org/mailman/listinfo.cgi/users
>>>
>>>
>
> --
> Daniel Spångberg
> Materialkemi
> Uppsala Universitet
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