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January 2011

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[LCRC Accounts] Project Allocation Request
by accounts＠lcrc.anl.gov 09 Jan '11

09 Jan '11

Hello, A change in allocation has been requested: Requester: larson (Jay Larson) Project: CouplingMechOpt Title: Mechanics and Optimization of Coupling in Multiphysics and Mulitscale Systems Description: Coupled systems--both multiscale and multiphysics--are increasingly relevant to modeling for basic scientific research and for highly applied engineering applications. The advent of ultrascale platforms comprising up to million-way parallelism begs the question: What kind of applications are amenable to this monumental computational capability, and how might we use this unprecedented computational power efficiently? Multiphysics and multiscale models comprising multiple subsystems in mutual interaction are a likely application for these platforms. The challenge then becomes developing infrastructure for managing what are likely to be time-evolving component loads while minimizing processor idle time in components awaiting coupling input from other components. As a first step towards a solution for intercomponent load management for parallel coupled models, we are developing a mechanism for multicomponent load management that includes support for dynamical resizing of component cohorts at runtime. The framework is built to complement and extend the Model Coupling Toolkit (MCT; http://mcs.anl.gov/mct) key coupling middleware used most notably in the Community Climate System Model. The resource requested is for prototyping of the aforementioned intercomponent load management system, and extensive sanity and performance testing of the system in a set of use cases ranging from simple “toy” problems up to (assuming all goes well) a coupled climate model such as CCSM. MCT is highly portable and routinely compiles/runs on fusion. MCT uses MPI and any Fortran compiler available on fusion. We expect we may need only minimal system consulting support to perform the work outlined. We are requesting access to fusion so that we have a medium-sized cluster to test out ideas and code. Typical job sizes would require small numbers of processors (<=64) for periods of 15 minutes or less; larger jobs would run for correspondingly shorter periods. Current: undetermined amount Justification: N/A Requested: 30000 A specific reason has been given: The reason for this request is that we have already used so much of our current allocation that we are unable to continue experiments. Could you please allocate us some more time ASAP as we are hoping to do some scalability experiments for a paper that must be submitted to ICCS 2011 by 15 January? Thanks and all the best... Jay Larson (PI, CouplingMechOpt) This needs to be approved and the final allocation amount decided upon. Thank You, The LCRC Accounts System

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[LCRC Accounts] Project Allocation Request
by accounts＠lcrc.anl.gov 05 Jan '11

05 Jan '11

Hello, A change in allocation has been requested: Requester: borland (Michael Borland) Project: ApsRenewalLattice Title: Development of accelerator lattices for the APS Renewal Description: Because of an allocation of 32 M hours received on intrepid, we will make use of fusion primarily for simulation of the SPX system, which is a related aspect of the APS upgrade. Simulations include on-going analysis of sensitivity to static and dynamic errors. We will also begin modeling of the impact of collective effects in the presence of a chirped beam. The computational methods for the SPX sensitivity are relatively simple, involving tracking a large (e.g, 10k) number of simulation particles to find the perturbed equilibrium. These simulations are to a large degree "embarrassingly parallel," as very little communication is required between processors. The simulations essentially consist of perturbing some aspect of the accelerator (e.g., a cavity phase or voltage) and tracking to find an equilibrium response. We also perform analysis of the response to time-dependent modulations. Simulations with single-bunch collective effects are similar, but involve more interprocess communication, although it is still quite limited. In these simulations, we track with various levels of beam intensity under various conditions to determine single-bunch instability limits. In addition to the single-bunch limits, we will use multi-bunch tracking simulation to find coupled-bunch instability limits. The parameters of these simulations need to be determined by some initial runs, but are about an order of magnitude more intensive than the single-bunch simulations. Current: undetermined amount Justification: Requested: 100000 A specific reason has been given: I am continuing to use fusion for time-intensive simulations of the effects of errors in the short-pulse x-ray system of APS-U. Only about 15% of my previous allocation remains. This needs to be approved and the final allocation amount decided upon. Thank You, The LCRC Accounts System

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