Jeff: Adagio has similar characteristics. Barry has recently released it so he should comment on its availability. Bronis On Fri, 17 Jan 2014, Jeff Hammond wrote:

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 <[email protected]> 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 [email protected]

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