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User level threads are threads that are visible to the programmer and are unknown to the kernel. The operating system kernel supports and manages kernel level threads. Three different types of models relate user and kernel level threads. Which of the following statements is/are true ? (a) (i) The Many - to - one model maps many user threads to one kernel thread (ii) The one - to - one model maps one user thread to one kernel thread (iii) The many - to - many model maps many user threads to smaller or equal kernel threads (b) (i) Many - to - one model maps many kernel threads to one user thread (ii) One - to - one model maps one kernel thread to one user thread (iii) Many - to- many model maps many kernel threads to smaller or equal user threads
To build a modularized kernel, the kernel-headers and kernel-source packages must first be installed. Where will you find the kernel-headers and kernel-source?
“ps” command uses the file _____ to provide the information. /stat b) /proc//smaps c) /proc//oom_score_adj d) /proc//oom_score
Which one of the following is a symlink to the root path as seen by the process? /root b) /proc//path c) both /proc/apm and /proc//path d) none of the mentioned
The entry for each file opened by the process is present in /fd b) /proc//file c) /proc//maps d) none of the mentioned
__________ sends all diagnostic logging information to a log file instead of to standard output or to the host’s syslog system.
Assume that a file is written using write (fd, buf, K) system call, where fd is the file descriptor and K is the number of bytes to be written to the current file offset which is a multiple of the disk block size D. The total number of disk block writes required to be executed before the system call returns
The number of persons who read magazine X only is thrice the number of persons who read magazine Y. The number of persons who read magazine Y only is thrice the number of persons who read magazine X. Then, which of the following conclusions can be drawn? i. The number of persons who read both the magazines is twice the number of persons who read only magazine X. ii. The total number of persons who read either one magazine or both the magazines is twice the number of persons who read both the magazines. Select the correct answer using the code given below:
Which one of the following file contains the environment for the process? /environ b) /proc//env c) /proc//path d) none of the mentioned
In a group of friends travelling in a train, 8 friends can read French book, 18 can read Spanish book and 9 can read Russian book. In that group, none can read any other language book. If 2 friends in the group can read two languages book and one friend can read all the three languages book, then how many friends are there in the group ?