The Exanet interconnection network contains gold wires, optical “wires”(photons)

Question

The Exanet interconnection network contains gold wires, optical “wires”(photons), and routers. Designers want a larger version, but are concerned about meeting the power-efficiency requirement, which is 100 words/s/watt. In the current version, gold wires dissipate 35 MWs of power, photons 0 MWs, and routers 105 MWs. The new version uses 17 times as many gold wires, and 13 times as many routers. Both items have constant unit power.

a) The new version dissipates          watts.

Exanet’s bisection bandwidth is given by
[10 * (# of gold wires)0.25 + 2.6 * (# of routers)0.75] GWs/s.
The original design has 300 gold wires and 10 routers.

b) The bisection bandwidth of the new version is             words/s.

c) The new version has a power efficiency of           words/s/watt, which                         (does/doesn’t) meet the power-efficiency requirement.

no handwriting please

Explanation / Answer

a) Power dissipation of new version=17*35 MW+13*105 MW=1960 MW.

b) The bisection bandwidth of the new version=10*17*300*0.25+ 2.6*13*10*0.75=13003.5 GWs)/s

c) Power efficiency of the new version=Bisection bandwidth/Power dissipation=13003.5 GWs/s/1960 MW=6634words/s/watt>100 words/s/watt.Thus the new version meets the power efficiency

Related Questions

Navigate

• Browse (All)
• Browse T
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.