Analytical Studies
Taking as parameters the average time interval spent by a processor in kernel level critical sections (L, for time in locked state), and the average time interval spent by a processor in tasks outside critical sections (E), the ratio L/E is crucial in evaluating software lockout.
Typical values for L/E range from 0.01 to 0.1. In a system with a L/E ratio of 0.05, for instance, if there are 15 CPUs, it is expected that on average 1 CPU will always be idle.; with 21 CPUs, 2.8 will be idle; with 40 CPUs, 19 will be idle; with 41 CPUs, 20 will be idle. Therefore adding more than 40 CPUs to that system would be useless. In general, for each L/E value, there's a threshold for the maximum number of useful CPUs.
Read more about this topic: Software Lockout
Famous quotes containing the words analytical and/or studies:
“I have seen too much not to know that the impression of a woman may be more valuable than the conclusion of an analytical reasoner.”
—Sir Arthur Conan Doyle (1859–1930)
“What happiness did poor Mother’s studies bring her? It is the melancholy tendency of such studies to separate people from their friends and neighbors and fellow creatures in whom alone lies one’s happiness.”
—Mary Potter Playne (c. 1850–?)