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| Polling | |
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| Tweet Topic Started: Jan 23 2018, 08:21 AM (4 Views) | |
| victorgrant | Jan 23 2018, 08:21 AM Post #1 |
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Hi, A polling cycle is the time in which each element is monitored once. The optimal polling cycle will vary according to several factors, including the desired speed of response and the overhead (e.g., processor time and bandwidth) of the polling. In roll call polling, the polling device or process queries each element on a list in a fixed sequence. Because it waits for a response from each element, a timing mechanism is necessary to prevent lock-ups caused by non-responding elements. Roll call polling can be inefficient if the overhead for the polling messages is high, there are numerous elements to be polled in each polling cycle and only a few elements are active. In hub polling, also referred to as token polling, each element polls the next element in some fixed sequence. This continues until the first element is reached, at which time the polling cycle starts all over again. For More Details: Tutoring Services Video |
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3:44 AM Jul 11