A multi-level scalable startup for parallel applications

High performance parallel machines with hundreds of thousands of processors and petascale performance are already in use, and even larger Exa flops scale computing systems which may have hundreds of millions of cores are planned. To run parallel applications on machines of such massive scale, one of the biggest challenges is the parallel startup process. This task involves two components: (1) parallel launching of appropriate processes on the given set of processors and (2) setting up communication channels to enable the processes to communicate with each other after process launching has completed. Most current startup mechanisms focus on either using special purpose daemons which waste system resources or using a startup manager which becomes a scalability bottleneck. In this thesis, we investigate the design and scalability of a SMP-aware, multi-level startup scheme with batching of remote shell sessions, which provides a complete solution to startup of a parallel application and facilitates its management during execution. It still supports existing Charm++ runtime capabilities including process health monitoring, facilitation of recovery from failures and scalable interaction with the application. We demonstrate the performance and scalability of this scheme by applying it to startup Charm++ applications. In particular, starting up a Charm++ program on 16,384 cores of Ranger (at TACC) with Ethernet as the underlying communication layer takes only 25 seconds and attains a speedup of over 400% compared to MPICH2-1.3 startup (using Hydra as process manager) and over 800% compared to Open MPI 1.3.1 startup on Ranger.

Name thesis:degree_name

M.S.

Level thesis:degree_level

Thesis

Discipline thesis:degree_discipline

Computer Science

Grantor

University of Illinois at Urbana-Champaign

Year dc:date

2012

Author dc:creator

• Gupta, Abhishek

Contributors dc:contributor

• Kale, Laxmikant V.

• parallel startup
• multi-level startup
• Hierarchical
• tree startup
• runtime
• Charm++

Statement dc:rights

• Copyright 2011 Abhishek Gupta

Language dc:language

en

Handle dc:identifier

http://hdl.handle.net/2142/29453

OAI identifier oai:identifier

oai:www.ideals.illinois.edu:2142/29453