Data management housekeeping is not the only problem to plague oversimplified approaches to high speed computation. The physical problems which are of practical interest tend to have rather significant complications. Examples of these complications are as follows: boundaries are likely to be irregular; interiors are likely to be inhomogeneous; computations required may be dependent on the states of the variables at each point; propagation rates of different physical effects may be quite different; the rate of convergence, or convergence at all, may be strongly dependent on sweeping through the array along different axes on succeeding passes; etc. The effect of each of these complications is very severe on any computer organization based on geometrically related processors in a paralleled processing system.
Gene AmdahlRelated topics
array ax based computation computer convergence datum dependent different effect high housekeeping interest irregular likely management organization physical plague point practical problem propagation quite rate significant speed succeeding sweeping system etc processing approaches rates states effectsRelated quotes
It is quite true that, to the best of my judgment, the argumentation which applies to brutes holds equally good of men; and, therefore, that all states of consciousness in us, as in them, are immediately caused by molecular changes of the brain-substance. It seems to me that in men, as in brutes, there is no proof that any state of consciousness is the cause of change in the motion of the matter of the organism. If these positions are well based, it follows that our mental conditions are simply the symbols in consciousness of the changes which takes place automatically in the organism; and that, to take an extreme illustration, the feeling we call volition is not the cause of a voluntary act, but the symbol of that state of the brain which is the immediate cause of that act.
Thomas Henry Huxley
Just as economic pressure from the base ... is able to modify the production of surplus value, so pressure grounded in spatial practice is alone capable of modifying the apportionment of that surplus value - i. e. the distribution of the portion of social surplus production allotted to society's collective 'interests', to so-called social services. Such grass-roots pressure, if it is to be effective in this regard, cannot be confined to attacking the state qua guardian of the 'general interest'. For this state, born of the hegemony of a class, has as one of its functions - and a more and more significant function - the organization of space, the regularization of its flows, the control of its networks. It devotes to these purposes a considerable part of global surplus value, of the surplus production assigned to the running of society.
Henri Lefebvre
Ever since the population of this little island grew large, trade has been its livelihood. We imported food and raw materials and paid for them by exports of coal and manufactures, by earnings from shipping and other services, and by interest on foreign investments. The first world war injured our position seriously, the second had far worse effects. When we stood alone in the second world war we threw all that we had into the battle... We sold our foreign assets. We reduced our production of civilian goods to a minimum. We lost nearly all our export trade and much of our shipping... We have, therefore, to face now before we have recovered from the effects of the war, and before our long-term plans have taken effect, the necessity of relying entirely on our own resources. This is a situation as serious as any that has faced us in our long history.
Clement Attlee
Machines as simple as thermostats can be said to have beliefs, and having beliefs seems to be a characteristic of most machines capable of problem solving performance. However, the machines mankind has so far found it useful to construct rarely have beliefs about beliefs, although such beliefs will be needed by computer programs that reason about what knowledge they lack and where to get it. Mental qualities peculiar to human-like motivational structures, such as love and hate, will not be required for intelligent behavior, but we could probably program computers to exhibit them if we wanted to, because our common sense notions about them translate readily into certain program and data structures. Still other mental qualities, e. g. humor and appreciation of beauty, seem much harder to model.
John McCarthy (computer scientist)
I want to make sure you keep your eyes on the ball, that is, the two basic missions of a central bank. The first is maintaining macroeconomic stability: maintaining stable growth and keeping inflation low and stable. The principal policy tool for maintaining macroeconomic stability is monetary policy. In normal times, the Fed and other central banks use open market operations-purchases and sales of securities in markets-to move interest rates up or down, and in doing so try to create a more stable macroeconomic environment.
The second part of a central bank's mission is maintaining financial stability. Central banks are focused on trying to ensure that the financial system functions properly, and in particular, they want to prevent, if possible, and if not, to mitigate the effects of a financial crisis or a financial panic.
Ben Bernanke
