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General graph directory
The serious problem with using an acyclic-graph structure is ensuring that there are no cycles. When we insert links to an existing tree-structured directory, the tree structure is damaged, resulting in a simple graph structure.
If cycles are permitted to exist in the directory, we likewise require to avoid searching any component twice, for reasons of correctness as well as performance.
Virtual file systems The file-system execution having of three major layers. The first layer is the file-system interface, based on the open, read, write and close calls and fi
SSTF (Shortest Seek Time First) After a demand go to the closest request in the work queue regardless of direction Decrease total seek time compared to FCFS Disadv
How can an index file be used to speed up the access in direct-access files? Have an index in memory; the index gives the key and the disk location of its corresponding record.
What is a sequential file? A file that is read one record or block or parameter at a time in order, based on a tape model of a file.
factors that influences layout
What is parsing Parsing is the procedure of analyzing a text, made of a sequence of tokens, to define its grammatical structure regarding to a given formal grammar. Parsing is
What is a file? A named collection of related data explained by the creator, recorded on secondary storage.
What is spooling? Spooling overlaps the I/O of single job with the computation of other jobs.
Define the “Throughput” of a system Throughput is Number of programs processed by it per unit time
How is it different from the unbounded buffer algorithm ? Explain.
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