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| DATE | 2015-03-30 |
| FROM | Ruben Safir
|
| SUBJECT | Subject: [LIU Comp Sci] HW 4.18 Problem
|
From owner-learn-outgoing-at-mrbrklyn.com Mon Mar 30 10:45:57 2015
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Date: Mon, 30 Mar 2015 10:45:30 -0400
From: Ruben Safir
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Subject: [LIU Comp Sci] HW 4.18 Problem
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thisis 4.18
Interesting problem in its own right. It is not theoretically necessary
to map the negative random numbers because distance is always a positive
number
I wan tot try this with OMP and spread the calculation across CPUs
One thing was, I maxed out of the instruction size for buffer size using
#declare
relocation truncated to fit: R_X86_64_32 against symbol `ts' defined in
.bss section in pi_lib.o
etc. No time to figure a fix but I have lots of ram, would be
interesting to use it all.
This is why NASA uses LISP.
Ruben
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--------------060906030808030106020600
Content-Type: text/x-csrc;
name="monty_pi.c"
Content-Transfer-Encoding: 7bit
Content-Disposition: attachment;
filename="monty_pi.c"
#include
#include
#include "pi_lib.h"
#include
void * wrapper(void*);
int main(int argc, char * argv[]){
double pi;
pthread_attr_t attr;
pthread_attr_init(&attr);
pthread_t tid;
void * arg = NULL;
pthread_create(&tid, &attr, wrapper, arg);
pthread_join(tid, NULL);
pi = calc_pi();
printf("Pi is estimated at ==> %f\n\n", pi);
return 1;
}
void * wrapper(void * arg){
random_point();
count_inside();
pthread_exit(arg);
}
--------------060906030808030106020600
Content-Type: text/x-chdr;
name="pi_lib.h"
Content-Transfer-Encoding: 7bit
Content-Disposition: attachment;
filename="pi_lib.h"
#ifndef MONTI_PI
#define MONTI_PI
#define MEMORY_SPACE 100000000
struct point{
double x;
double y;
};
struct point * random_point(void);
double calc_pi(void);
int count_inside(void);
#endif
--------------060906030808030106020600
Content-Type: text/x-csrc;
name="pi_lib.c"
Content-Transfer-Encoding: 7bit
Content-Disposition: attachment;
filename="pi_lib.c"
/* Question 4.18 from the operating systems HW from Text
* OS Ed 9
* Class Operating SYstems at LIU
* Prog M Ghriger
*
* Ruben Safir - Student
* ********************************************************/
#include
#include
#include "pi_lib.h"
#include
#include
struct point workspace[MEMORY_SPACE];
long seed = 0;
long inside_the_circle = 0;
struct timespec ts;
struct point sample;
struct point * random_point(void)
{
int i;
double x,y;
if(seed == 0){
clock_gettime(CLOCK_REALTIME, &ts);
seed = ts.tv_nsec;
srand(seed);
}
for (i = 0; i < MEMORY_SPACE; i++){
//fprintf( stderr, "Error %d\n", __LINE__);
//x = ((double)rand()) % (double)1000000 ;
x = rand() % 1000000 ;
x = x / (double)1000000;
// printf ("x==> %F", x);
//y = ((double)rand())% (double)1000000 ;
y = rand()% 10000000 ;
y = y / (double)10000000;
// printf(" y==> %F\n", y);
workspace[i].x = x;
workspace[i].y = y;
}
return &workspace[0];
}
int count_inside(void)
{
int i = 0;
double d;
for(i = 0; i < MEMORY_SPACE; i++){
d = sqrt(pow(workspace[i].x, 2.0) + pow(workspace[i].y, 2.0));
// printf ("distance => %f\n", d);
if (d <= 1.0)
inside_the_circle++;
}
return inside_the_circle;
}
double calc_pi(){
return 4.0 * (( double)inside_the_circle/ (double)MEMORY_SPACE) ;
}
--------------060906030808030106020600
Content-Type: text/plain; charset=UTF-8;
name="makefile"
Content-Transfer-Encoding: base64
Content-Disposition: attachment;
filename="makefile"
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--------------060906030808030106020600--
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