Scalable Cluster Management: Frameworks, Tools, and Systems

Scalable Cluster Management:Frameworks, Tools, and Systems

David A. EvenskyAnn C. GentilePete Wyckoff

Robert C. ArmstrongRobert L. ClayRon Brightwell

Sandia National Laboratories

Lilith: a tool framework for very large clusters

• Most current tools for clusters are designed as monolithic programs, to do one task well.

• If you need a new task, you need a new tool.

• The Lilith framework allows users to easily construct new tools using a component framework.

Control of large distributed systems

• System administration• Auditing & job control by users• Interrogation of processes• Simple Applications

1 sec program on 1000 nodes

16min10sec

Lilith: Scalable component framework

C lientData

D istribution

ExecutionC lient

ResultCollectionC lient

• Lilith spans a tree of machines executing user-defined code.

• User code (Lilim/Lilly) provides component functionality on a single node

• Provides scalable distribution, result collection

Component Methods

• MO[] distributeOnTree(MO, int[])– data distribution down the tree

• MO onTree(MO)– component action on the node

• MO collateOnTree(MO[])– result collection and condensation

Security

Uses purely Java 2 mechanisms atthis time….

User sendscredential with call

LilithHost createsProtectionDomain fromuser credential

LilithHost calls checkPermission

LilithHost

PolicyKeys

Method invocation

Sandbox setup similarly usingthe User credential and PolicyFile

Prototypical tools

System monitoring toolto track the state of acluster of machines

PS-tool to get sortable processinformation from selected nodesof the cluster.

Lilith Lights tool

• Snake toy app– demo that draws a

snake over front panel

– no global repository for state --- all info distributed

– Snake’s movement was limited to left half of machine

• program error in declaration of drand48() biased results

Who serves who?

• Programmers adapt to:– The OS that runs on the machine,– The system configuration chosen by the admins– Changing system environments

• economically driven to heterogeneous distributed computing

• Why can’t the user dictate the software environment as a resource request?

DASE

• Dynamically Adaptive Software Environment• Provide multi-OS/multi-environment

capability• Manage multiple SW environments• “save” user environment for reuse later• Integration with SW component architectures

DASE Service Object Model

Physical systemLogical partitioning

“system”model

PartitionerApp Object- resource spec- data/map objects

Solver

Visualizer

MesherScheduler

ResourceRequest

Flexible Resource Management

RM/VM

S chedu ler/R esource M anagem ent

V irtua l M ach ine

A pp lica tion E nvironm ent

D A S E S ession M anager

H ierarch ica l N et B ooting

RM/VM RM/VM

DASEClient

TFlopsPRE

HPVMCustom

Lin

ux

NT

ComponentsFramew orks

con

tro

l

info

rma

tion

App Environment Specification

Scalable Unit

power serial Ethernet Myrinet

To

syst

em s

uppo

rt n

etw

ork

100BaseT hub

16 p

ort M

yrin

et s

wit

ch

compute

compute

compute

compute

compute

compute

compute

service

8 Myrinet LAN cables

sss0

Ter

min

al s

erve

r

Pow

er c

ontr

olle

r

100BaseT hub

16 p

ort M

yrin

et s

wit

ch

compute

compute

compute

compute

compute

compute

compute

service

Ter

min

al s

erve

r

Pow

er c

ontr

olle

r

System Support Hierarchy

sss1

Admin access

sss0

node

node

node

nodeScalable

Unit

In-use copyof systemsoftware

NFS mountroot fromSSS0

sss0

node

node

node

nodeScalable

Unit

In-use copyof systemsoftware

NFS mountroot fromSSS0

sss0

node

node

node

nodeScalable

Unit

In-use copyof systemsoftware

NFS mountroot fromSSS0

Master copyof systemsoftware

Hardware Management

• Discovery and Control– Perl scripts that

• control individual devices (power controller, terminal server, machine, switch)

• build a database of configuration info (MAC and IP addresses, serial numbers, etc.)

• Roles– database is augmented with each components role

in the system (compute, sss0, terminal server, etc.)

“Virtual Machines”

• Allows arbitrary grouping of scalable units that use the same system software

• Operations to update system software and boot nodes, scalable units, or machines

• Updates system software on an SU in 1 min.• Update system software on 24 SUs in 1.5 min.• Boot an SU in 5 min. (staged for power drain)• Boot 24 SUs in 10 min.

“Virtual Machines”

sss1Uses rdist topush system softwaredown

sss0nodenodenode

nodeScalable

Unit

In-use copyof systemsoftwareNFS mountroot fromSSS0

sss0nodenodenode

nodeScalable

Unit

In-use copyof systemsoftwareNFS mountroot fromSSS0

sss0nodenodenode

nodeScalable

Unit

In-use copyof systemsoftwareNFS mountroot fromSSS0

Linux 2.3Beta

AlphaProduction SU configuration

database

http://dancer.ca.sandia.govhttp://www.cplant.ca.sandia.govhttp://www.cs.sandia.gov/cplant