CScADS Workshop on

Libraries and Algorithms for Petascale Applications

July 30^th – August 2^nd, 2007

Held at the

Snowbird Ski & Summer Resort

Highway 210, Little Cottonwood Canyon

Snowbird, Utah 84092-9000

Organized by Jack Dongarra and Bill Gropp

This workshop is sponsored by the

Center for Scalable Application Development Software,

with funding from the

DOE Office of Science through the

Scientific Discovery through Advanced Computing (SciDAC) program.

We would like to thank you for agreeing to participate in the CScADS workshop on Libraries and Algorithms for Petascale Applications. The purpose of this workshop is to identify challenges for library and algorithm developers from the needs of the SciDAC applications, and to foster collaboration between the communities.  Specific topics to include the effective use of multicore processors (both algorithms and libraries) and the use of automatic tuning in libraries, but would not be restricted to those topics.

The workshop charge is to:

•      Identify important open problems and challenges for performance tools for petascale systems

•      Brainstorm on promising approaches to open problems

•      Identify infrastructure needs to address key challenges

•      Assess available infrastructure

•      Identify opportunities for synergy

–    opportunities to

•      consolidate and harden existing infrastructures

•      reuse existing components developed by others

•      refactor and extend existing components to apply them to new challenges

•      Collaborate on design of sharable components

•      Identify targets of opportunity for further investment of resources

–    strategic investment targets for the DOE Office of Science

We would like to keep things informal.

Dress at the workshop is informal. Please tell us if you need special requirements (vegetarian food etc...) We are expecting to have an internet and wireless connections at the meeting. There will be a laptop projector for giving talks.

We hope everyone will participate in the discussions that occur during the sessions and outside the meeting room. We are looking for more cutting edge, provocative, honest, and/or controversial talks.

The workshop and all guest rooms are in the Cliff Lodge. The workshop will take place in the Summit Room which is on the 10^th floor.

The Banquet and reception on the 1st floor. If the weather's nice, we can have it outside, otherwise they'll find a room for us inside (last week it was in the WasatchB room).

Additional information and be found at http://cscads.rice.edu/workshops/july2007/workshop-logistics

and http://cscads.rice.edu/workshops/july2007/lib-workshop-07

For reimbursement there will be forms. Since your hotel is already covered by the workshop we will probably just need your airfare receipt.

Please remember that Snowbird is at 8500 ft altitude. Coming from low altitude, drink plenty of liquids, don't have too much alcohol your first day or so, and take it easy.

For those of you around Sunday evening, folks can informally gather in the Aerie lounge on the 10th floor of the Cliff Lodge to find old friends.

For those of you not taking the shuttle, the Cliff Lodge is "Entry 4" into Snowbird.

Agenda:

List of Attendees:

Questions for groups

·        What do users want from libraries that they don’t have now?

o   Functionality

§  Operations

§  Types/precision/data layouts

o   Ease of use

§  Portability

§  Interoperability

§  Reproducibility

§  Maintainability

o   Scalability

§  Target platforms (petascale, multicore, clusters, …)

§  Fraction of peak

§  Memory hierarchies /Out of core

§  Hierarchical machines ->

·        Role of automatic code generation and tuning?

o   When is it worth starting over to write a library generator rather than a library?

§  Dealing with hierarchical machines

o   Maintainability

o   Adapting to new architectures

o   How much are users willing to accommodate runtime tuning in their applications?