Select all that applies. In addressing limitations on how to wait for output using kernel buffers, it is OK if O Upper layer semaphore may wait on buffer space in Middle layer to produce output Upper layer semaphore may signal the Middle layer semaphore when it produces output Middle layer semaphore may wait on buffer space in Lower layer to produce output Middle layer semaphore may signal the Lower layer semaphore when it produces output

Select all that applies. In addressing limitations on how to wait for output using kernel buffers, it is OK if O Upper layer semaphore may wait on buffer space in Middle layer to produce output Upper layer semaphore may signal the Middle layer semaphore when it produces output Middle layer semaphore may wait on buffer space in Lower layer to produce output Middle layer semaphore may signal the Lower layer semaphore when it produces output

LINUX+ AND LPIC-1 GDE.TO LINUX CERTIF.

5th Edition

ISBN:9781337569798

Author:ECKERT

Publisher:ECKERT

Chapter7: Working With The Bash Shell

Section: Chapter Questions

Problem 5DE

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In this part, we add the CPU temperature ID of the Raspberry Pi to the MQTT stream. Open a new terminal and create a new script by the name of py and add the following content to it. import paho.mqtt.client as mqtt import time from subprocess import check_output from re import findall def get_temp(): temp = check_output(["vcgencmd","measure_temp"]).decode("UTF-8") return(findall("\d+\.\d+",temp)[0]) def on_connect(client, userdata, flags, rc): print("Connected with result code "+str(rc)) client.subscribe("etec224_mqtt_test/") global Connected Connected = True Connected = False client = mqtt.Client() client.on_connect = on_connect client.connect("broker.emqx.io", 1883, 60) client.loop_start() while Connected!= True: #Wait Here time.sleep(0.1) try: while True: value = get_temp() client.publish('etec224_mqtt_test/', value) time.sleep(1) except KeyboardInterrupt: client.disconnect()…
The NX (“no execute”) bit can also be supported by modern CPUs. To force a CPU to avoid running the code on a file, set the NX bit to 1 on that page. Currently, the OS and paging hardware implement this maximum quantity. Keep in mind that non-X86-compliant software/hardware can be executed on an OS and hardware How about a parser who wants to enforce NX above the operating system level? The programmer inserts a nX-bit association with each memory page at the bottom (in other words, at each memory location of nX bits.) The programmer imposes a size limit of 4095 bytes for application-level data structures. each stack frame is allocated in its own page, and no stack frame is larger than a page. At a given point in time, a stack frame might look like this: |-----------------------| | | +-----------------------+ entry %esp-->| return address | +-----------------------+ new %ebp---->| saved %ebp | +-----------------------+ | buf[4] | | buf[3] | | buf[1] | | buf[0] |…
Which of the following mapping technique allows main memory block to be mapped to any cache line? a. Unified. b. Direct. c. Associative. d. Set associative.
Imagine that to save space, the TLB drops the Read/Write and User/Supervisor protection bits. The page table still has the protection bits. However, when moving from user mode to kernel mode (or vice versa), the TLB is flushed. i) Could a process access memory belonging to another process? How? ii) Could a process access memory belonging to the kernel? How? iii) What problem could arise if a process can write memory it is normally supposed to only read?
Create a bash script that will take two directories as input parameters, iterate over the lists of files, and report files which are either present in one directory but missing in the other, or present in both directories but differ in content. The script MUST NOT consider subdirectories or files therein. The script should work with both relative and absolute paths. This also means the output format displayed must contain a relative or absolute path depending on what the original argument was (see attached image for commands allowed)
1.NTFS/FAT32 etc differ from VFS in that: * a). They do not use a unified structure to take care of various files, directories devices etc. b). It is much easier to add a new device and add device drivers for it in VFS. They appear as files. c). In VFS the devices can be accessed as memory mapped while in other filesystems, one need to only use I/O instructions. d). a&b e). a&c f). b&c g). a&b&c h). None of the above.
Note: Write a bash script to simulate producer-consumer problem using semaphores. Producer-consumer problem is a common paradigm for cooperating processes. A producer process produces information that is consumed by a consumer process. One solution to the producer-consumer problem uses shared memory. To allow producer and consumer processes to run concurrently, there must be available a buffer of items that can be filled by the producer and emptied by the consumer. This buffer will reside in a region of memory that is shared by the producer and consumer processes. A producer can produce one item while the consumer is consuming another item. The producer and consumer must be synchronized, so that the consumer does not try to consume an item that has not yet been produced.
A local write system call is not an idempotent operation but the write remote procedure call in NFS is idempotent. What makes the NFS RPC call idempotent? a) The write RPC sends data from the client's buffer cache rather than from the user's program. b) One of the parameters is the file offset. c) The RPC system supports at-most-once semantics. d) Each procedure call contains a unique sequence number so duplicates can be discarded.
The OS uses a bitmap data structure to keep track of whether or not a partition is empty or full. What bitmap conventions are used to depict the procedure or the void in allocation units? Answer alternatives that fall under this cluster include: *process bit *hole bit *free bit *flag bit
Perform virtual memory management, using terminal commands via Ubuntu Linux, including the following points: Use of commands cd /, cd proc, cd sys, cd vm, cd etc.Using the ls commandUsing the sudo cat /proc/sys/vm/swappiness commandUsing the sudo sysctl/ -w vm command.swappiness=30Using the sudo command gedit / proc / sys / vm / swappinessUsing the sudo gedit sysctl command.confUsing the sudo reboot command
Which of the following system calls is used to delete a shared memory segment? shmat() shmctl() shmattach() shmdt()
1. An SSD has 2 dies, each die has 4 planes, each plane has 4096 blocks, each block has128 pages, each page is of 16 KB size. If 10% is saved for bad block mapping, whatwill be usable size of the SSD. 2. Consider an application that generates 10,400 IOPS, with 60 percent of them beingReads. Calculate the disk load in RAID 5? 3. What will happen In NFS 4.0 File handler if a file was deleted and replaced with a fileof the Same name and try to access that file? 4. A user working on a particular system facing issues with the application loading veryslow as that requires to load 10 GB of application files for the program to open and thesame application needs 1TB of dedicated storage space for data which is dynamic innature. Find a cost-effective solution for the said issue. 5. In case of SSD defragmentation is not recommended justify with reasons?