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Describe the technique of packing.
The physical record size will not accurately match the length of the desired logical record and the Logical records may even differ in length. Packing a number of logical records into physical blocks is a common solution to this problem. In UNIX the operating system describes all files to be simply a stream of bytes and in this case the logical record is one byte. The file system automatically unpacks or packs bytes into physical disk blocks say 512 bytes per block as necessary.
The physical size, logical size and the packing technique determine how many logical records are in each physical block. The file perhaps considered being sequence of blocks and all the basic I/O functions operate in terms of blocks.
Q. Is disk scheduling except FCFS scheduling useful in a single-user environment? describe your answer. Answer: In a single-user environment the I/O queue typically is empty.
LRU approximation page replacement In this we are able to use the reference bit associated with the page entry to choose a page to be removed. The various algorithms used for
VARIABLE PARTITIONING We can differ the partitions and change the location according to the size of the process. Here if a 10k process enters we are able to make a space of
What is page fault? In the computer storage technology a page fault is an exception which is raised by the memory management unit when a requested page isn't mapped in physical
Now we consider the following questions: how can the parent process communicate with its child? Or how can children processes communicate with other children? The exact answer depe
As we have discussed, page tables map virtual page addresses to physical page addresses. One of the advantages of using virtual addresses is that we can achieve complete separation
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i need to complete project on lan architceture RAIDs etc
what is application software?
What is thrashing? It is a method in virtual memory schemes when the processor spends most of its time swapping pages, rather than implementing instructions. This is because o
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