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diff --git a/doc/17.md b/doc/17.md new file mode 100644 index 0000000..0b21ed4 --- /dev/null +++ b/doc/17.md @@ -0,0 +1,28 @@ +# Distributed Systems + +A distributed system is a collection of processors that do not share memory or a clock. +Each node has its own local memory. +The nodes communicate with one another through various networks, such as high-speed buses +and the Internet. + +## Network operating systems + +Allows users to log in remotely. + +```bash +$ ssh cs.yale.edu +``` + +Allows remote file transfer from one host to another. + + +Load balancing: The processes may be distributed across the network to even the workload. +Computation speedup: A single process can be divided into a number of subprocesses that can run concurrently. +Hardware preference: The process may have characteristics that make it more suitable for execution on some specialized processors. +Software preference: The process may require software that is available at only a particular site. +Data access: it may be more efficient to have a process run remotely than to transfer all the data. + +## Summary + +A distributed system is a collection of processors that do not share memory or a clock. +The processors in a distributed system vary in size and function. |