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MIT Technology Review ©2020 v.|e^iπ|
Moore's Law illustration
MS Tech
[94]Computing / [95]Quantum Computing
We’re not prepared for the end of Moore’s Law
It has fueled prosperity of the last 50 years. But the end is now in sight.
by [96]David Rotman
Feb 24, 2020
Moore's Law illustration
MS Tech
Gordon Moore’s 1965 forecast that the number of components on an
integrated circuit would double every year until it reached an
astonishing 65,000 by 1975 is the greatest technological prediction of
the last half-century. When it proved correct in 1975, he revised what
has become known as Moore’s Law to a doubling of transistors on a chip
every two years.
Since then, his prediction has defined the trajectory of technology
and, in many ways, of progress itself.
Moore’s argument was an economic one. Integrated circuits, with
multiple transistors and other electronic devices interconnected with
aluminum metal lines on a tiny square of silicon wafer, had been
invented a few years earlier by Robert Noyce at Fairchild
Semiconductor. Moore, the company’s R&D director, realized, as he wrote
in 1965, that with these new integrated circuits, “the cost per
component is nearly inversely proportional to the number of
components.” It was a beautiful bargain—in theory, the more transistors
you added, the cheaper each one got. Moore also saw that there was
plenty of room for engineering advances to increase the number of
transistors you could affordably and reliably put on a chip.
Soon these cheaper, more powerful chips would become what economists
like to call a general purpose technology—one so fundamental that it
spawns all sorts of other innovations and advances in multiple
industries. A few years ago, leading economists credited the
information technology made possible by integrated circuits with a
third of US productivity growth since 1974. Almost every technology we
care about, from smartphones to cheap laptops to GPS, is a direct
reflection of Moore’s prediction. It has also fueled today’s
breakthroughs in artificial intelligence and genetic medicine, by
giving machine-learning techniques the ability to chew through massive
amounts of data to find answers.
But how did a simple prediction, based on extrapolating from a graph of
the number of transistors by year—a graph that at the time had only a
few data points—come to define a half-century of progress? In part, at
least, because the semiconductor industry decided it would.
Cover of Electronics Magazine April, 1965
The April 1965 Electronics Magazine in which Moore's article appeared.
Wikimedia
Moore wrote that “cramming more components onto integrated circuits,”
the title of his 1965 article, would “lead to such wonders as home
computers—or at least terminals connected to a central
computer—automatic controls for automobiles, and personal portable
communications equipment.” In other words, stick to his road map of
squeezing ever more transistors onto chips and it would lead you to the
promised land. And for the following decades, a booming industry, the
government, and armies of academic and industrial researchers poured
money and time into upholding Moore’s Law, creating a self-fulfilling
prophecy that kept progress on track with uncanny accuracy. Though the
pace of progress has slipped in recent years, the most advanced chips
today have nearly 50 billion transistors.
Every year since 2001, MIT Technology Review has chosen the 10 most
important breakthrough technologies of the year. It’s a list of
technologies that, almost without exception, are possible only because
of the computation advances described by Moore’s Law.
For some of the items on this year’s list the connection is obvious:
consumer devices, including watches and phones, infused with AI;
climate-change attribution made possible by improved computer modeling
and data gathered from worldwide atmospheric monitoring systems; and
cheap, pint-size satellites. Others on the list, including quantum
supremacy, molecules discovered using AI, and even anti-aging
treatments and hyper-personalized drugs, are due largely to the
computational power available to researchers.
But what happens when Moore’s Law inevitably ends? Or what if, as some
suspect, it has already died, and we are already running on the fumes
of the greatest technology engine of our time?
RIP
^“It’s over. This year that became really clear,” says Charles
Leiserson, a computer scientist at MIT and a pioneer of parallel
computing, in which multiple calculations are performed simultaneously.
The newest Intel fabrication plant, meant to build chips with minimum
feature sizes of 10 nanometers, was much delayed, delivering chips in
2019, five years after the previous generation of chips with
14-nanometer features. Moore’s Law, Leiserson says, was always about
the rate of progress, and “we’re no longer on that rate.” Numerous
other prominent computer scientists have also declared Moore’s Law dead
in recent years. In early 2019, the CEO of the large chipmaker Nvidia
agreed.
In truth, it’s been more a gradual decline than a sudden death. Over
the decades, some, including Moore himself at times, fretted that they
could see the end in sight, as it got harder to make smaller and
smaller transistors. In 1999, an Intel researcher worried that the
industry’s goal of making transistors smaller than 100 nanometers by
2005 faced fundamental physical problems with “no known solutions,”
like the quantum effects of electrons wandering where they shouldn’t
be.
For years the chip industry managed to evade these physical roadblocks.
New transistor designs were introduced to better corral the electrons.
New lithography methods using extreme ultraviolet radiation were
invented when the wavelengths of visible light were too thick to
precisely carve out silicon features of only a few tens of nanometers.
But progress grew ever more expensive. Economists at Stanford and MIT
have calculated that the research effort going into upholding Moore’s
Law has risen by a factor of 18 since 1971.
Likewise, the fabs that make the most advanced chips are becoming
prohibitively pricey. The cost of a fab is rising at around 13% a year,
and is expected to reach $16 billion or more by 2022. Not
coincidentally, the number of companies with plans to make the next
generation of chips has now shrunk to only three, down from eight in
2010 and 25 in 2002.
Finding successors to today’s silicon chips will take years of
research.If you’re worried about what will replace moore’s Law, it’s
time to panic.
Nonetheless, Intel—one of those three chipmakers—isn’t expecting a
funeral for Moore’s Law anytime soon. Jim Keller, who took over as
Intel’s head of silicon engineering in 2018, is the man with the job of
keeping it alive. He leads a team of some 8,000 hardware engineers and
chip designers at Intel. When he joined the company, he says, many were
anticipating the end of Moore’s Law. If they were right, he recalls
thinking, “that’s a drag” and maybe he had made “a really bad career
move.”
But Keller found ample technical opportunities for advances. He points
out that there are probably more than a hundred variables involved in
keeping Moore’s Law going, each of which provides different benefits
and faces its own limits. It means there are many ways to keep doubling
the number of devices on a chip—innovations such as 3D architectures
and new transistor designs.
These days Keller sounds optimistic. He says he has been hearing about
the end of Moore’s Law for his entire career. After a while, he
“decided not to worry about it.” He says Intel is on pace for the next
10 years, and he will happily do the math for you: 65 billion (number
of transistors) times 32 (if chip density doubles every two years) is 2
trillion transistors. “That’s a 30 times improvement in performance,”
he says, adding that if software developers are clever, we could get
chips that are a hundred times faster in 10 years.
Still, even if Intel and the other remaining chipmakers can squeeze out
a few more generations of even more advanced microchips, the days when
you could reliably count on faster, cheaper chips every couple of years
are clearly over. That doesn’t, however, mean the end of computational
progress.
Time to panic
Neil Thompson is an economist, but his office is at CSAIL, MIT’s
sprawling AI and computer center, surrounded by roboticists and
computer scientists, including his collaborator Leiserson. In a new
paper, the two document ample room for improving computational
performance through better software, algorithms, and specialized chip
architecture.
One opportunity is in slimming down so-called software bloat to wring
the most out of existing chips. When chips could always be counted on
to get faster and more powerful, programmers didn’t need to worry much
about writing more efficient code. And they often failed to take full
advantage of changes in hardware architecture, such as the multiple
cores, or processors, seen in chips used today.
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Thompson and his colleagues showed that they could get a
computationally intensive calculation to run some 47 times faster just
by switching from Python, a popular general-purpose programming
language, to the more efficient C. That’s because C, while it requires
more work from the programmer, greatly reduces the required number of
operations, making a program run much faster. Further tailoring the
code to take full advantage of a chip with 18 processing cores sped
things up even more. In just 0.41 seconds, the researchers got a result
that took seven hours with Python code.
That sounds like good news for continuing progress, but Thompson
worries it also signals the decline of computers as a general purpose
technology. Rather than “lifting all boats,” as Moore’s Law has, by
offering ever faster and cheaper chips that were universally available,
advances in software and specialized architecture will now start to
selectively target specific problems and business opportunities,
favoring those with sufficient money and resources.
Indeed, the move to chips designed for specific applications,
particularly in AI, is well under way. Deep learning and other AI
applications increasingly rely on graphics processing units (GPUs)
adapted from gaming, which can handle parallel operations, while
companies like Google, Microsoft, and Baidu are designing AI chips for
their own particular needs. AI, particularly deep learning, has a huge
appetite for computer power, and specialized chips can greatly speed up
its performance, says Thompson.
But the trade-off is that specialized chips are less versatile than
traditional CPUs. Thompson is concerned that chips for more general
computing are becoming a backwater, slowing “the overall pace of
computer improvement,” as he writes in an upcoming paper, “The Decline
of Computers as a General Purpose Technology.”
At some point, says Erica Fuchs, a professor of engineering and public
policy at Carnegie Mellon, those developing AI and other applications
will miss the decreases in cost and increases in performance delivered
by Moore’s Law. “Maybe in 10 years or 30 years—no one really knows
when—you’re going to need a device with that additional computation
power,” she says.
The problem, says Fuchs, is that the successors to today’s general
purpose chips are unknown and will take years of basic research and
development to create. If you’re worried about what will replace
Moore’s Law, she suggests, “the moment to panic is now.” There are, she
says, “really smart people in AI who aren’t aware of the hardware
constraints facing long-term advances in computing.” What’s more, she
says, because application--specific chips are proving hugely
profitable, there are few incentives to invest in new logic devices and
ways of doing computing.
Wanted: A Marshall Plan for chips
In 2018, Fuchs and her CMU colleagues Hassan Khan and David Hounshell
wrote a paper tracing the history of Moore’s Law and identifying the
changes behind today’s lack of the industry and government
collaboration that fostered so much progress in earlier decades. They
argued that “the splintering of the technology trajectories and the
short-term private profitability of many of these new splinters” means
we need to greatly boost public investment in finding the next great
computer technologies.
If economists are right, and much of the growth in the 1990s and early
2000s was a result of microchips—and if, as some suggest, the sluggish
productivity growth that began in the mid-2000s reflects the slowdown
in computational progress—then, says Thompson, “it follows you should
invest enormous amounts of money to find the successor technology.
We’re not doing it. And it’s a public policy failure.”
There’s no guarantee that such investments will pay off. Quantum
computing, carbon nanotube transistors, even spintronics, are enticing
possibilities—but none are obvious replacements for the promise that
Gordon Moore first saw in a simple integrated circuit. We need the
research investments now to find out, though. Because one prediction is
pretty much certain to come true: we’re always going to want more
computing power.
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[100]Artificial Intelligence
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