1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176 | /*
* Copyright 2021 Jeisson Hidalgo-Cespedes - Universidad de Costa Rica
*/
#include <assert.h>
#include <pthread.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include "dynamic_simulation.h"
#define MIN(a, b) ((a) < (b) ? (a) : (b))
typedef struct private_thread_data {
size_t thread_number; // rank
dynamic_simulation_t* dynamic_simulation;
} private_thread_data_t;
int dynamic_simulation_create_threads(dynamic_simulation_t* dynamic_simulation);
void dynamic_simulation_print_statistics(
dynamic_simulation_t* dynamic_simulation);
int produce(dynamic_simulation_t* dynamic_simulation);
void* work(void* data);
int dynamic_simulation_init(dynamic_simulation_t* dynamic_simulation,
simulation_t* simulation) {
assert(dynamic_simulation);
assert(simulation);
dynamic_simulation->simulation = simulation;
dynamic_simulation->durations = calloc(simulation->thread_count
, sizeof(data_t));
queue_init(&dynamic_simulation->work_queue);
sem_init(&dynamic_simulation->can_work, /*pshared*/ 0, 0);
return 0;
}
void dynamic_simulation_destroy(dynamic_simulation_t* dynamic_simulation) {
assert(dynamic_simulation);
sem_destroy(&dynamic_simulation->can_work);
queue_destroy(&dynamic_simulation->work_queue);
free(dynamic_simulation->durations);
}
int dynamic_simulation_run(dynamic_simulation_t* dynamic_simulation) {
assert(dynamic_simulation);
dynamic_simulation_create_threads(dynamic_simulation);
dynamic_simulation_print_statistics(dynamic_simulation);
return 0;
}
int dynamic_simulation_create_threads(
dynamic_simulation_t* dynamic_simulation) {
int error = 0;
simulation_t* simulation = dynamic_simulation->simulation;
pthread_t* workers = (pthread_t*)
malloc(simulation->thread_count * sizeof(pthread_t));
private_thread_data_t* private_thread_data = (private_thread_data_t*)
calloc(simulation->thread_count, sizeof(private_thread_data_t));
if (workers && private_thread_data) {
clock_gettime(/*clk_id*/CLOCK_MONOTONIC, &dynamic_simulation->start_time);
for (size_t index = 0; index < simulation->thread_count; ++index) {
private_thread_data[index].thread_number = index;
private_thread_data[index].dynamic_simulation = dynamic_simulation;
error = pthread_create(&workers[index], NULL, work
, &private_thread_data[index]);
if (error) {
fprintf(stderr, "error: could not create thread %zu\n", index);
error = 21;
}
}
produce(dynamic_simulation);
for (size_t index = 0; index < simulation->thread_count; ++index) {
pthread_join(workers[index], NULL);
}
free(private_thread_data);
free(workers);
} else {
fprintf(stderr, "error: could not allocate memory for %zu threads\n"
, simulation->thread_count);
error = 22;
}
return error;
}
void dynamic_simulation_print_statistics(
dynamic_simulation_t* dynamic_simulation) {
assert(dynamic_simulation);
simulation_t* simulation = dynamic_simulation->simulation;
printf("%-7s", "Dynamic");
data_t max_duration = 0;
for (size_t index = 0; index < simulation->thread_count; ++index) {
if (dynamic_simulation->durations[index] > max_duration) {
max_duration = dynamic_simulation->durations[index];
}
printf(" %4u", dynamic_simulation->durations[index]);
}
printf(" %8u", max_duration);
assert(max_duration > 0);
const double speedup = (double)dynamic_simulation->simulation->total_duration
/ max_duration;
printf(" %7.2lf", speedup);
const double efficiency = speedup / simulation->thread_count;
printf(" %10.2lf", efficiency);
printf(" %12.9lf", calculate_elapsed_time(&dynamic_simulation->start_time));
putchar('\n');
}
int produce(dynamic_simulation_t* dynamic_simulation) {
assert(dynamic_simulation);
simulation_t* simulation = dynamic_simulation->simulation;
int error = EXIT_SUCCESS;
for (size_t index = 0; index < simulation->work.count; ++index) {
error = queue_append(&dynamic_simulation->work_queue
, simulation->work.elements[index]);
if (error) {
break;
}
sem_post(&dynamic_simulation->can_work);
}
// Produce the end-of-work marker
if (error == EXIT_SUCCESS) {
error = queue_append(&dynamic_simulation->work_queue, END_OF_WORK);
if (error == EXIT_SUCCESS) {
sem_post(&dynamic_simulation->can_work);
}
}
return error;
}
void* work(void* data) {
private_thread_data_t* private_data = (private_thread_data_t*)data;
dynamic_simulation_t* dynamic_simulation = private_data->dynamic_simulation;
const size_t rank = private_data->thread_number;
while (true) {
sem_wait(&dynamic_simulation->can_work);
assert(queue_is_empty(&dynamic_simulation->work_queue) == false);
const data_t duration = queue_dequeue(&dynamic_simulation->work_queue);
if (duration != END_OF_WORK) {
usleep(duration);
dynamic_simulation->durations[rank] += duration;
} else {
queue_append(&dynamic_simulation->work_queue, END_OF_WORK);
sem_post(&dynamic_simulation->can_work);
break;
}
}
return NULL;
}
|