11:55 Home > Take Test: Final Question Completion Status: Technique used to improve I/O efficiency by temporarily storing copies of data is called О A) spooling. B) buffering. C) caching. D) memory mapping. Click Save and Submit to save and submit. Click Save All Answers to save all answers. AA Save All Answers Save and Submit bbhosted.cuny.edu 11:55 Home Take Test: Final Question Completion Status: Buffering in I/O is used to A) cope with a speed mismatch between the producer and consumer of a data stream. B) provide adaptations for devices that have different data-transfer sizes. C) support copy semantics for application I/O. D) All of the above. Click Save and Submit to save and submit. Click Save All Answers to save all answers. Save All Answers Save and Submit bbhosted.cuny.edu
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- A file whose file descriptor is fd contains the following sequence of bytes 3,1,4,1,5,9,2,6,5,3,5 Lseek (fd,3,SEEK_SET); read(fd,&buffer,4); Where the lseek call makes a seek to byte 3 of the file .what does buffer contain after the read has completed.A file whose file descriptor is fd contains the following sequence of bytes: 3, 1, 4, 1, 5,9, 2, 6, 5, 3, 5. The following system calls are made:lseek(fd, 3, SEEK_SET);read(fd, &buffer, 4); where the lseek call makes a seek to byte 3 of the file. What does buffer contain after the read has completed? I guess the answer is 1,5,9,2, but I'm not sure. Please tell me the detailed steps ,thanksLoad infile using one byte per channel and save it as a PNG, using outfile for the file name. Use one byte per channel. graphics.cpp 1 #define STB IMAGE IMPLEMENTATION 2 #define STB IMAGE WRITE IMPLEMENTATION #include "stb_image.h" #include "stb_image_write.h" 3 4 #include #include 7 using namespace std; 8 9. int main() 10 { string infile = "pete.png"; string outfile = "out.png"; 11 12 13 14 15 16 17 } CodeCheck Reset
- Operating system The free space bitmap looks like this:1010 0000 0000 0000:The system always searches for free blocks starting at the lowest numbered block. Block size is 4 KiB. (Blocks that belong to the same le do not need to be contiguous.) Write down the bitmap after each of the following actions:(a) File A of size 22 KiB is written.(b) File B of size 10 KiB is written.(c) File A is deleted.(d) File C of size 29 KiB is written.(e) File B is deleted.Load infile using one byte per channel and save it as a PNG, using outfile for the file name. Use one byte per channel. graphics.cpp 1 #define STB IMAGE IMPLEMENTATION 2 #define STB IMAGE WRITE IMPLEMENTATION #include "stb_image.h" #include "stb_image_write.h" #include 3 5 #include 7 using namespace std; 8 int main() { string infile = "pete.png"; string outfile = "out.png"; 10 11 12 13 14 15 16 17 }The redo log buffer and Shared pool are elements of? a) PGA b) Buffer cache c) PGA and Buffer cache d) SGA
- Question 1 3 pts Regarding the fstream data type, specify the file access flag that will preserve existing data but will allow data to be written at the end of the file. Question 2 3 pts What is true about Random Access Files? Check all that apply. O The program can read file data anywhere the read location is positioned. O Data can be read in any order specified in the program. O seekp and seekg can be used to access files by a given position. O Data must e sorted to to use random access functions. Question 3 3 pts The default delimiter character for the 3rd argument of the getline method is Question 4 3 pts Binary files contain raw data that is not necessarily stored as text. Question 5 3 pts Which of the following methods can be used to indicate the state of a File I/O operation? "State" meaning the indication that an operation was successful or not - or that more data exists for an operation. Check all that apply. D eof() O fail) O clear) O bad) O locked)Minix Suppose a file is on a filesystem using a 1K block size. This file is maintained on thedisk using i-nodes as is typical on many UNIX filesystems (as described on pages 286-287 and789-790 of your text). Suppose there are seven direct pointers, and then a pointer to one singlydirect block, a pointer to a doubly indirect block, and a pointer to a triply indirect block. Suppose aprogram creates and opens a file in this filesystem, and then seeks to the following positions,writes a character, and then exits. Identify how many disk blocks, (both data and indirect blocks)must be allocated to store the data for the file. (Note that a-c each represent a different file.)a. Seek to 9000b. Seek to 300000c. Seek to 67,000,000How big would a file need to be to require the triply indirect pointer?Discover what file streams are and how they're used to join files as input and output for data. Exhibit file streams' capacity for both binary and text input/output?
- 2. Assume that each block has B = 1000 Bytes, and the buffer pool has m=210+1=1001 frames. What is the exact size of the largest file external memory sorting can sort using 3 passes (pass 0 pass 2; pass 2 produces only 1 run)? What is the scale of the above file, 1KB, 1MB, 1GB, 1TB, or 1PB?Problem 0. Suppose a file contains 100 bytes of data. A program successfully opens it for both reading and writing (i.e., passing the mode O_READWR to open()), and gets back a file descriptor number fd. a. The program, which has a 40-byte buffer, issues a call to read() for 40 bytes. It processes that data, and then repeats the call. Both calls return the exact amount requested. Then it issues a third read, again requesting 40 bytes. What value will it return? (Assume no other program has the file open.) b. Next the program calls write (fd, buffer, 40), and the call returns 40. Then it issues another read() call for 40 bytes. What value does that call return? c. Suppose the programmer needs to read back the 40 bytes just written. First it must use 1seek() to reposition the file pointer. What parameters should it invoke 1seek () with so that the next read call will return the 40 bytes just written?Filesystem Accesses: Assume a filesystem that with respect to this question has already cached the root inode structure in memory, but has not yet cached any file data/content. What is the minimum number of block I/O requests that need to be submitted to a disk to access the file content of a file "/usr/frankeh/WTH". Think about the structure of inode and directories and each access required to get to the data Your answer