[mpich-devel] P states and MPI

[Jeff Hammond]

Thanks Bill.  I agree with your assessment.  If this is the type of
thing that pays off in practice, then it seems to argue for the
necessary policy changes.

Bronis - What impresses me about this is the ease at which it can
deployed.  For the codes for which it reduces power consumption, it's
free joules.  If it doesn't, there is nothing lost.  If your code is
similarly portable and easy to deploy, then I'll have to evaluate
which one is more effective for the relevant workload.

Best,

Jeff


On Fri, Jan 17, 2014 at 8:46 AM, Bronis R. de Supinski <bronis at llnl.gov> wrote:
>
> Um, I would say the Dell approach has no novelty and is
> rather rudimentary. We have done a lot more in Adagio:
>
> http://dl.acm.org/citation.cfm?id=1542340
>
> @inproceedings{Rountree:2009:AMD:1542275.1542340,
>  author = {Rountree, Barry and Lownenthal, David K. and de Supinski, Bronis
> R. and Schulz, Martin and Freeh, Vincent W. and Bletsch, Tyler},
>  title = {Adagio: Making DVS Practical for Complex HPC Applications},
>  booktitle = {Proceedings of the 23rd International Conference on
> Supercomputing},
>  series = {ICS '09},
>  year = {2009},
>  isbn = {978-1-60558-498-0},
>  location = {Yorktown Heights, NY, USA},
>  pages = {460--469},
>  numpages = {10},
>  url = {http://doi.acm.org/10.1145/1542275.1542340},
>  doi = {10.1145/1542275.1542340},
>  acmid = {1542340},
>  publisher = {ACM},
>  address = {New York, NY, USA},
>  keywords = {dvfs, dvs, energy, mpi, runtime},
>
> }
>
>
>
> On Fri, 17 Jan 2014, William Gropp wrote:
>
>> There has been some work on this for parallel programs; Wu Feng at
>> Virginia Tech has done some, for example.  I don't recall seeing any work
>> that used the profiling interface.  Some of the issues raised, especially
>> the required privs, mean that this is only available for experiments, not
>> production, until that changes.  Also, its sometimes possible to make
>> predictions about wait times based on previous iterations; that could be
>> used to refine such control.
>>
>> Bill
>>
>> William Gropp
>> Director, Parallel Computing Institute
>> Deputy Director for Research
>> Institute for Advanced Computing Applications and Technologies
>> Thomas M. Siebel Chair in Computer Science
>> University of Illinois Urbana-Champaign
>>
>>
>>
>>
>> On Jan 16, 2014, at 9:36 PM, Jeff Hammond wrote:
>>
>>> I was impressed by
>>>
>>> http://www.hpcadvisorycouncil.com/events/2013/Spain-Workshop/pdf/5_Dell.pdf
>>> /
>>> http://www.bsc.es/sites/default/files/public/mare_nostrum/2013hpcac-05.pdf.
>>> I wonder if anyone else has seen this, done anything similar, is
>>> interested in doing something similar, etc.  I can imagine that a more
>>> integrated implementation has some performance advantages, albeit at
>>> much greater maintenance cost.
>>>
>>> Thanks,
>>>
>>> Jeff
>>>
>>> --
>>> Jeff Hammond
>>> jeff.science at gmail.com
>>
>>
>>
>



-- 
Jeff Hammond
Argonne Leadership Computing Facility
University of Chicago Computation Institute
jhammond at anl.gov / jhammond at uchicago.edu / (630) 252-5381
http://www.linkedin.com/in/jeffhammond
https://wiki.alcf.anl.gov/parts/index.php/User:Jhammond