IBM Research Report · IBM Research Report To Know or Not to Know: On the Needed Amount of...

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H-0242 (H0609-002) September 4, 2006Computer Science

IBM Research Report

To Know or Not to Know: On the Needed Amount of Management Information

David BreitgandIBM Research Division

Haifa Research LaboratoryMt. Carmel 31905

Haifa, Israel

Amir Nahir, Danny RazThe Computer Science Department

TechnionHaifa, Israel

Research DivisionAlmaden - Austin - Beijing - Haifa - India - T. J. Watson - Tokyo - Zurich

LIMITED DISTRIBUTION NOTICE: This report has been submitted for publication outside of IBM and will probably be copyrighted if accepted for publication. It has been issued as a ResearchReport for early dissemination of its contents. In view of the transfer of copyright to the outside publisher, its distribution outside of IBM prior to publication should be limited to peer communications and specificrequests. After outside publication, requests should be filled only by reprints or legally obtained copies of the article (e.g. , payment of royalties). Copies may be requested from IBM T. J. Watson Research Center , P.O. Box 218, Yorktown Heights, NY 10598 USA (email: reports@us.ibm.com). Some reports are available on the internet at http://domino.watson.ibm.com/library/CyberDig.nsf/home .

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Traffic Intensity = 0.55

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0 50 100 150 200 250 300 3501

1.5

2

2.5

Board update frequency (once per X time units)

Ave

rage

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d = 2d = 10d = 20d = 40

Traffic Intensity =0.55

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0 10 20 30 40 50 601

2

3

4

5

6

7

8

9

d − the number of Peers

Ave

rage

Tim

e in

the

Sys

tem

Per−job load pollingBoad update every time unitBoard update every 2 time unitsBoard update every 4 time unitsBoard update every 190 time units

Traffic Intensity =0.85

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0 20 40 60 80 100 120 140 160 1800

2

4

6

8

10

12

Board Update Frequency (once per X time units)A

vera

ge T

ime

in th

e S

hyst

em

d = 2d = 10

Traffic Intensity =0.99

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clients

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d −1 = 2

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