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How to store 6.5 billion images

Jason Sobel the manager of infrastructure engineering at Facebook, gave a presentation at Stanford recently. He explains how Facebook efficiently stores ~6.5 billion images, in 4 or 5 sizes each, totalling 30 billion files, and a total of 540TB and serving 475,000 images per second at peak.

You can look at the presentation here.

If Facebook’s storage is 540TB. How big is Google’s? The mind boggles.

Via Slashdot.

Mars impact

New Scientist details a pretty awesome collision in space:

At roughly 8500 by 10,600 kilometres across, it is nearly 15 times the area of the Moon’s South Pole-Aitken basin which, at 2500 kilometres in diameter, is the largest undisputed impact scar in the solar system.

The Mars crater was probably created by an object as large as 2700 kilometres across – over half of the diameter of Mercury. The effects of such an impact would have been catastrophic, says Andrews-Hanna.

“Within the basin you’d have had a magma ocean – it would have been easily several tens of kilometres deep,” he says. “Outside the basin you would have had a tremendous amount of ejecta raining back down on the surface.”

Feck.

The Big Picture

Eamonn points to the rather excellent Big Picture blog over at the Boston Globe. However, as a long time reader of Barry Ritholtz’s blog, also called the Big Picture, I have to say my loyalties stay with Barry.

Incidentally, he isn’t too happy with other blogs ‘stealing’ the name of his finance oriented blog. The LA times also recently launched a blog with the same name.

Who next? An Irish paper?

Is Google Making Us Stupid?

The Atlantic’s cover story by Nicholas Carr this month is really very good.

For me, as for others, the Net is becoming a universal medium, the conduit for most of the information that flows through my eyes and ears and into my mind. The advantages of having immediate access to such an incredibly rich store of information are many, and they’ve been widely described and duly applauded. “The perfect recall of silicon memory,” Wired’s Clive Thompson has written, “can be an enormous boon to thinking.” But that boon comes at a price. As the media theorist Marshall McLuhan pointed out in the 1960s, media are not just passive channels of information. They supply the stuff of thought, but they also shape the process of thought. And what the Net seems to be doing is chipping away my capacity for concentration and contemplation. My mind now expects to take in information the way the Net distributes it: in a swiftly moving stream of particles. Once I was a scuba diver in the sea of words. Now I zip along the surface like a guy on a Jet Ski.

Worth a look.

American Realism for a New World

U.S. Secretary of State Condoleezza Rice writes an essay in the latest edition of Foreign Affairs. It is essentially a follow up to a similar essay she wrote back in 2000.

I like this bit:

The United States did not overthrow Saddam to democratize the Middle East. It did so to remove a long-standing threat to international security. But the administration was conscious of the goal of democratization in the aftermath of liberation. We discussed the question of whether we should be satisfied with the end of Saddam’s rule and the rise of another strongman to replace him. The answer was no, and it was thus avowedly U.S. policy from the outset to try to support the Iraqis in building a democratic Iraq. It is important to remember that we did not overthrow Adolf Hitler to bring democracy to Germany either. But the United States believed that only a democratic Germany could ultimately anchor a lasting peace in Europe.

Hm. That’s not the way I remember it. And as I’m reading Scott McLellan’s book What Happened at the moment, I don’t think that’s the way he recalls it either. The argument to democritise the Middle East was often times used by the administration.

Overall, Rice is extremely positive about everything, concluding:

How to describe this disposition of ours? It is realism, of a sort. But it is more than that — what I have called our uniquely American realism. This makes us an incredibly impatient nation. We live in the future, not the past. We do not linger over our own history. This has led our nation to make mistakes in the past, and we will surely make more in the future. Still, it is our impatience to improve less-than-ideal situations and to accelerate the pace of change that leads to our most enduring achievements, at home and abroad.

At the same time, ironically, our uniquely American realism also makes us deeply patient. We understand how long and trying the course of democracy is. We acknowledge our birth defect, a constitution founded on a compromise that reduced my ancestors each to three-fifths of a man. Yet we are healing old wounds and living as one American people, and this shapes our engagement with the world. We support democracy not because we think ourselves perfect but because we know ourselves to be deeply imperfect. This gives us reason to be humble in our own endeavors and patient with the endeavors of others. We know that today’s headlines are rarely the same as history’s judgments.

An international order that reflects our values is the best guarantee of our enduring national interest, and America continues to have a unique opportunity to shape this outcome. Indeed, we already see glimpses of this better world. We see it in Kuwaiti women gaining the right to vote, in a provincial council meeting in Kirkuk, and in the improbable sight of the American president standing with democratically elected leaders in front of the flags of Afghanistan, Iraq, and the future state of Palestine. Shaping that world will be the work of a generation, but we have done such work before. And if we remain confident in the power of our values, we can succeed in such work again.

I guess she has to be positive.

Recession in Ireland

I should remind readers that the Economist Intelligence Unit in November 2007 said the following:

* Despite an estimated increase in the euro area inflation rate to 2.6% in October, the European Central Bank (ECB) is not expected to increase interest rates above the current rate of 4%.
* The fiscal position is deteriorating, and this will place constraints on government expenditure. A deficit is expected by 2009.
* GDP growth is expected to slow sharply in 2008, mainly because of the ongoing slowdown in the previously overheated property sector. However, there is a real risk of recession.
* Unemployment is expected to rise over the outlook period, as the construction sector shrinks, but inflation and the current-account deficit will both fall.


I blogged about it back then as Ahern had recently said people who talk down the economy might as well kill themselves. Well, I guess those naysayers were correct. And Ahern was simply ignoring the problem. His successor has also ignored the problem. Now we have to deal with what the EIU forecast.

Anyone who has been watching sites like Treesdontgrowtothesky, DaftWatch or Irish Property Watch will see that the property market is in very serious doo-doo. And it is getting progressively worse. The number of houses coming on the market is rising, and the number of buyers out there is falling as a result of a return to normal lending conditions (yes we were living in a credit bubble for some time).

So what does all this mean for Ireland?

It’s the big R. And it will be with us for a while.

Update: The ESRI press release is available here.


The B/T account

In case anyone is in any doubt as to why the Tribunal is so interested in the B/T account. There are a number of reasons.

The main reason I can discern is the volume of £5,000 lodgments.
The second reason is the two large other lodgments of £19,000 and £20,000.

For a moment, forget everything that Collins and Ahern have said and look coldly at the figures. Imagine that B/T stands for Bertie/Tim, as four PTSB staff have sworn to believe it to be.

£7,285.71, June 6, 1989 (PTSB)
£5,000, March 30, 1990 cheque (PTSB)
£5,000, April 27, 1991 (PTSB)
£5,000 February 24, 1992 cheque (PTSB)
£20,000, August 25, 1992 cheque (PTSB)
£5,000, January 26, 1993 cheque (PTSB)
£5,000, January 26, 1993 cheque (PTSB)
£20,000, October 26, 1994
£10,000, July 18, 1995

Now think of this.

In the early 1990s it was common practice for Frank Dunlop to pay retainers to politicians. These retainers sometimes consisted of £5,000. Once zoning was given by the council, politicians were then given “success fees”. These were larger than the retainers and were a reward for the successful zoning. The retainers were kept by politicians whether the zoning was successful or not.

After Dunlop had his day of clarity and began admitting giving bribes, he went back through his diary and scribbled out stuff. The tribunal refers to it as “obliteration”. We still don’t know quite why he did it, but thanks to the FBI, the Tribunal were able to unobliterate his diary entries.

Here is an example of a Dunlop diary entry he obliterated (Square brackets are me):

February 1, 1991

9 o’clock, John, Ken/Kevin, Paul

£75,000 “clause” or “close”

£50,000 development/build

£5,000 if nothing happens

Or this:

October 9, 1991, [RE CityWest]

8.30 Davys DS [David Shubotham]

BH [Brendan Hickey]

LL [Liam Lawlor]

Renew lands

Agreed schedule of payments with DS

£5,000 down

£20k following, £10k before Christmas

Oh yes, Shubotham. Remember he was involved in the Greencore share scam in 1993 when Ahern was selling of the State’s stake? The Davy guys sold the shares to themselves. Smart men.

Hence the interest in B/T. The amounts are curious. The name is curious. PTSB staff said it was Bertie/Tim. Tim Collins controlled the account. Bertie Ahern was on paper unconnected from the money. If I were a Tribunal, or any form of investigator, I too would be interested.

Oh and what was that cheque from January 1993? A cheque from Davy.


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