Re: Top 5 computes at Google?

On Mon, Jun 23, 2008 at 10:07 AM, Theodore Omtzigt wrote:

Khazret:

We should be able to do this from first principals: 0.25s and let's say they use 4000 servers. I think the size of the index server banks is large since they benefit from having the whole index in memory. Whole index in memory + redundancy + 1000s queries per sec indicates a large cluster for this (I was trying to dig up info on the size of the index but can't find it right now so it is a bit of a shot from the hip).

0.25s on 4000 servers

1 index server is 400Watts given that these have large memory configs and fastish cpus

assume the network takes about 1/4 of the power of the cluster it serves

so approximate the query consumes of the order of 500kJoules. Let's see if we can put this in perspective: A hair dryer is about 1500Watts: so the query takes as much energy as running the hair dryer for 5.5 minutes. Please double check my math.

Theo

If we take your numbers as starting point, then extrapolation gives us following energy consumption for September 2007:

500 kilojoules is about 138.88 watt-hour, so 2,217,000 jobs/month gives 307.89696 megawatt-hour,

which equals about 205,264.64 of pretty American women standing in front of mirror with hairdryer. :)

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