$1-$ First, I want to know the validity of this information: $$If the number of threads increases, the speedup increases.$$

$2-$ If this information is correct, my code should work correctly when I increase the number of threads in the terminal. I was trying to increase the number of n$,$ but it did not work.

$($what is the problem anParallel Execution Time: $1\mathrm{.}39998$e$-06$ seconds

Serial Execution Time: $1\mathrm{.}10001e-06$ seconds

Speedup: $0\mathrm{.}785731$

Efficiency: $0\mathrm{.}785731$

$810,1516,20,100,199,500$

PS C:$\backslash$Users$\backslash$thekr$\backslash$Desktop$\backslash$Parallel$\_$computing$\_$project$\backslash$x$64\backslash$Debug$>./$Parallel$\_$computing$\_$project $2$

Parallel Execution Time: $1\mathrm{.}99999e-06$ seconds

Serial Execution Time: $1\mathrm{.}50001e-06$ seconds

Speedup: $0\mathrm{.}750011$

Efficiency: $0\mathrm{.}375005$

$810151620100199500$

PS C:$\backslash$Users$\backslash$thekr$\backslash$Desktop$\backslash$Parallel$\_$computing$\_$project$\backslash$x$64\backslash$Debug$>./$Parallel$\_$computing$\_$project $3$

Parallel Execution Time: $1\mathrm{.}89999e-06$ seconds

Serial Execution Time: $1\mathrm{.}40001e-06$ seconds

Speedup: $0\mathrm{.}736853$

Efficiency: $0\mathrm{.}245618$

$810,151620100199500$

PS C:$\backslash$Users$\backslash$thekr$\backslash$Desktop$\backslash$Parallel$\_$computing$\_$project$\backslash$x$64\backslash$Debug$>./$Parallel$\_$computing$\_$project $4$

Parallel Execution Time: $1\mathrm{.}80001e-06$ seconds

Serial Execution Time: $1\mathrm{.}50001e-06$ seconds

Speedup: $0\mathrm{.}833333$

Efficiency: $0\mathrm{.}208333$

$810151620100199500$

PS C:$\backslash$Users$\backslash$thekr$\backslash$Desktop$\backslash$Parallel$\_$computing$\_$project$\backslash$x$64\backslash$Debug$>./$Parallel$\_$computing$\_$project $16$

Parallel Execution Time: $3\mathrm{.}09999e-06$ seconds

Serial Execution Time: $2\mathrm{.}29999e-06$ seconds

Speedup: $0\mathrm{.}741933$

Efficiency: $0\mathrm{.}0463708$

$8,10,15,16,20,100,199,500$

PS C:$\backslash$Users$\backslash$thekr$\backslash$Desktop$\backslash$Parallel$\_$computing$\_$project$\backslash$x$64\backslash$Debug$>|$d how can I correct it$?$ Can you provide me with the code after modification?$)$

#include

#include

#include

#include

#include

using namespace std;

void Parallel$\_$sort$($vector& X$,$ double& parallel$\_$execution$\_$time$)$

$\{$

unsigned int i$,$ j$,$ count, N $=$ X$.$size$()$;

vector tmp$($N$)$;

double start$\_$time $=$ omp$\_$get$\_$wtime$()$;

#pragma omp parallel for private$($i$,$ j$,$ count$)$ shared$($X$,$ tmp$)$

for $($i $=0$; i $$ N; i$++)$

$\{$

count $=0$;

for $($j $=0$; j $$ N; j$++)$

if $($X$[$j$]$ X$[$i$]||($X$[$j$]==$ X$[$i$]$ && j $$ i$))$

count$++$;

tmp$[$count$]=$ X$[$i$]$;

$\}$

double end$\_$time $=$ omp$\_$get$\_$wtime$()$;

parallel$\_$execution$\_$time $=$ end$\_$time $-$ start$\_$time;

copy$($tmp$.$begin$(),$ tmp$.$end$(),$ X$.$begin$())$;

$\}$

void Serial$\_$sort$($vector& X$,$ double& serial$\_$execution$\_$time$)$

$\{$

double start$\_$time $=$ omp$\_$get$\_$wtime$()$;

sort$($X$.$begin$(),$ X$.$end$())$;

double end$\_$time $=$ omp$\_$get$\_$wtime$()$;

serial$\_$execution$\_$time $=$ end$\_$time $-$ start$\_$time;

$\}$

int main$($int argc, char$*$ argv$[])$

$\{$

$//$if $($argc $!=2)\{$

$//$cout $$ "Usage: $"$ argv endl;

$//$return $1$;

$//\}$

int num$\_$threads $=$ atoi$($argv$[1])$;

omp$\_$set$\_$num$\_$threads$($num$\_$threads$)$;

vector num $=\{5,2,8,1,8\}$;

double parallel$\_$execution$\_$time $=0\mathrm{.}0$;

Parallel$\_$sort$($num$,$ parallel$\_$execution$\_$time$)$;

double serial$\_$execution$\_$time $=0\mathrm{.}0$;

Serial$\_$sort$($num$,$ serial$\_$execution$\_$time$)$;

cout $$ "Parallel Execution Time: $"$ parallel$\_$execution$\_$time seconds" $$ endl;

cout $$ "Serial Execution Time: $"$ serial$\_$execution$\_$time seconds" $$ endl;

double speedup $=$ serial$\_$execution$\_$time $/$ parallel$\_$execution$\_$time;

cout $$ "Speedup: $"$ speedup $$ endl;

double efficiency $=$ speedup $/$ num$\_$threads;

cout $$ "Efficiency: $"$ efficiency $$ endl;

for $($const auto& n : num$)\{$

cout $$ n ;

$\}$

cout $$ endl;

return $0$;

$\}$