Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
Present your own fully documented and tested programming example illustrating the prevention of a data race in a parallelised program.
This is an example where total number of prime number between 2 and 10000 is being calculated. The order of memory accesses is prevented from being non-deterministic and from the code data race is avoided by making it parallelized with OpenMP directives. The inconsistency can be seen by running the program consecutively for 3 or more times.
#include
#define MyThreads 4
#define num 10000
int primeNum[num];
int primeF[num];
int is_prime(int v)
{
int i;
int lim = floor(sqrt(v)) + 1;
for (i = 2; i < lim; i++) {
/* no need to check against known composites */
if (!primeF[i])
continue;
if (v % i == 0) {
primeF[v] = 0;
return 0;
}
return (v > 1);
int main(int argn, char **argv)
int total = 0;
printf("Enter a number greater than 2");
scanf("%d", &num)
#ifdef _OPEnumMP
omp_set_dynamic(0);
omp_set_num_threads(MyThreads);
#endif
for (i = 0; i < num; i++) {
primeF[i] = 1;
#pragma omp parallel for
for (i = 2; i < num; i++) {
if ( is_prime(i) ) {
primeNum[total] = i;
total++;
printf("total prime numbers that lie between 2 and %d: %d\n",
num, total);
What are the three main activities of an operating system in regard to secondary-storage management? a) Free-space management. b) Storage allocation. c) Disk scheduling.
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.
Q. Some untimely computers protected the operating system by placing it in a memory partition that couldn't be modified by either the user job or the operating system itself. Expl
List disadvantages of using a single directory. Users have no privacy. Users must be careful in choosing file names, to avoid names used by others. Users may destroy each othe
Explain the Thread Local Storage (TLS) Windows NT provides unique functions for per-thread data management. Thread local storage (TLS) is a concept defined in NT so develope
Now, let us discuss two related algorithms for deciding which pages to evict. The clock algorithm is one of the most popular choices. It works by keeping frames in a circular struc
1. Draw a schematic diagram of a CMOS inverter and explain its operation. 2. Draw schematic diagrams of CMOS NAND and NOR gates, and explain their operation. 3. Explain what
The field that consists of a segment index or an internal index is known as Target datum is field that consists of a segment index or an internal index.
Define the WindowsNT WindowsNT provides a two-level approach to resource management: process and thread. The process is the uppermost level and contains most of the application
Explain system-wide open-file and per-process open-file The system-wide open-file table have a copy of the FCB of each open file, as well as other information. The per-pr
Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!
whatsapp: +91-977-207-8620
Phone: +91-977-207-8620
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd