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Subject: Re: [OMPI users] openmpi 1.4 broken -mca coll_tuned_use_dynamic_rules 1
From: Daniel Spångberg (daniels_at_[hidden])
Date: 2009-12-30 10:35:06


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