An operating system, or OS, is a software program that enables the computer hardware to communicate and operate with the computer software. The most well-known operating systems are Windows, Mac OS and Linux, all of which have different versions. Jul 4, 2009 - During job execution, only those Disadvantages • Individual. Serial processing The earliest computer system has no OS at all, and is.

Spooling is a technique by which multiple processes can submit their jobs to spool process and can continue other tasks. Printer server is one of the best example to explain better. Multiple computers are connected to same printer and each of them can request to print a document. Spooler as printer receives print request and en-queue all print request and completes one by one. Spool process running at printer can also assign some priority among the en-queued print request. This way serialization goes away from submitter point of view and they can perform other tasks without waiting for the completion of submitted task.

Question: What are the advantages of Multiprocessing or Parallel System? Answer: Multiprocessing operating system or the parallel system support the use of more than one processor in close communication.

The advantages of the multiprocessing system are: • Increased Throughput − By increasing the number of processors, more work can be completed in a unit time. • Cost Saving − Parallel system shares the memory, buses, peripherals etc. Multiprocessor system thus saves money as compared to multiple single systems. Also, if a number of programs are to operate on the same data, it is cheaper to store that data on one single disk and shared by all processors instead of using many copies of the same data. • Increased Reliability − In this system, as the workload is distributed among several processors which results in increased reliability. If one processor fails then its failure may slightly slow down the speed of the system but system will work smoothly.