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 computation computer convergence datum different high interest likely organization plague point problem propagation quite significant speed sweeping etc processing StatesRelated quotes
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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.
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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.
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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.
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