SCHEDULE: NOV 12-18, 2011

When viewing the Technical Program schedule, on the far righthand side is a column labeled "PLANNER." Use this planner to build your own schedule. Once you select an event and want to add it to your personal schedule, just click on the calendar icon of your choice (outlook calendar, ical calendar or google calendar) and that event will be stored there. As you select events in this manner, you will have your own schedule to guide you through the week.

You can also create your personal schedule on the SC11 app (Boopsie) on your smartphone. Simply select a session you want to attend and "add" it to your plan. Continue in this manner until you have created your own personal schedule. All your events will appear under "My Event Planner" on your smartphone.

Avoiding hot-spots on two-level direct networks

SESSION: Optimizing Communication Performance

EVENT TYPE: Paper

TIME: 4:00PM - 4:30PM

AUTHOR(S):Abhinav Bhatele, Nikhil Jain, William D. Gropp, Laxmikant V. Kale

ROOM:TCC 305

ABSTRACT:
A low-diameter, fast interconnection network is going to be a pre-requisite for building exascale machines. A two-level direct network has been proposed by several groups as a scalable design for future machines. The presence of multiple levels in this design leads to hot-spots on a few links for applications where grouping processes together is optimal for minimizing total communication volume. This is especially true for communication graphs with a small number of neighbors per task. In this paper, we explore intelligent topology aware mappings for different communication patterns on the physical topology to identify cases that minimize link utilization. We also analyze the trade-offs between using direct and indirect routing with different mappings. We use simulations to study communication and overall performance of applications on two-level direct networks since there are no installations of such networks yet. This study raises interesting issues regarding choice of job scheduling, routing and mapping.

Chair/Author Details:

Abhinav Bhatele - Lawrence Livermore National Laboratory

Nikhil Jain - University of Illinois at Urbana Champaign

William D. Gropp - University of Illinois at Urbana-Champaign

Laxmikant V. Kale - University of Illinois at Urbana-Champaign

  Click here to download .ics calendar file

  Click here to download .vcs calendar file

  Click here to add event to your Google Calendar

The full paper can be found in the ACM Digital Library