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ISSN 0249-6399 apport de recherche INSTITUT NATIONAL DE RECHERCHE EN INFORMATIQUE ET EN AUTOMATIQUE Performance Evaluation of Clock Synchronization Algorithms Emmanuelle Anceaume and Isabelle Puaut N ˚ 3526 Octobre 1998 TH ` EME 1

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ISS

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249-

6399

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INSTITUT NATIONAL DE RECHERCHE EN INFORMATIQUE ET EN AUTOMATIQUE

Performance Evaluation of ClockSynchronization Algorithms

Emmanuelle Anceaume and Isabelle Puaut

N ˚ 3526

Octobre 1998

THEME 1

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Algorithm [PB95] (SYNC - TT - AV)

Crash clock 0

Clock 0Clock 1Clock 2Clock 3Clock 4Clock 5Clock 6Clock 7

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Algorithm [PB95] (SYNC - TT - AV)

Clock crash

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Real time (seconds)

Algorithm [LL88] (SYNC - TT - AV)

Failure clock 2

Clocks 0,1,3,4,5,6,7

Clock 0Clock 1Clock 2Clock 3Clock 4Clock 5Clock 6Clock 7

-600

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0

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Real time (seconds)

Algorithm [LL88] (SYNC - TT - AV)

Failure clock 2

Clock correction

Clock 0Clock 1Clock 2Clock 3Clock 4Clock 5Clock 6Clock 7

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0

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Ci(t

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Real time (seconds)

Algorithm [ST87] (MSG - TT - NAV)

Failure clock 2

Clocks 0,1,3,4,5,6,7

Clock 0Clock 1Clock 2Clock 3Clock 4Clock 5Clock 6Clock 7

-500

0

500

1000

1500

2000

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Real time (seconds)

Algorithm [ST87] (MSG - TT - NAV)

Failure clock 2

Clock correction

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0 50 100 150 200 250 300

Ci(t

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Real time (seconds)

Algorithm MsgRcrFTM (MSG - RCR - AV)

Failure clock 3

Clocks 0,1,2,4,5,6,7

Clock correction

Clock 0Clock 1Clock 2Clock 3Clock 4Clock 5Clock 6Clock 7

-1000

-500

0

500

1000

0 50 100 150 200 250 300

Ci(t

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t (m

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Real time (seconds)

Algorithm MsgRcrSW (MSG - RCR - AV)

Failure clock 2

Clock correction

Clock 0Clock 1Clock 2Clock 3Clock 4Clock 5Clock 6Clock 7

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0

1000

2000

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4000

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Ci(t

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Real time (seconds)

Algorithm [ST87] (MSG - Empty - NAV)

Failure clock 2

Clock correction

Clock 0Clock 1Clock 2Clock 3Clock 4Clock 5Clock 6Clock 7

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Unite de recherche INRIA Lorraine, Technopole de Nancy-Brabois, Campus scientifique,615 rue du Jardin Botanique, BP 101, 54600 VILLERS LES NANCY

Unite de recherche INRIA Rennes, Irisa, Campus universitaire de Beaulieu, 35042 RENNES CedexUnite de recherche INRIA Rhone-Alpes, 655, avenue de l’Europe, 38330 MONTBONNOT ST MARTIN

Unite de recherche INRIA Rocquencourt, Domaine de Voluceau, Rocquencourt, BP 105, 78153 LE CHESNAY CedexUnite de recherche INRIA Sophia-Antipolis, 2004 route des Lucioles, BP 93, 06902 SOPHIA-ANTIPOLIS Cedex

EditeurINRIA, Domaine de Voluceau, Rocquencourt, BP 105, 78153 LE CHESNAY Cedex (France)��������� ���� ���������� ��� ���

ISSN 0249-6399