csci5451/assignments/01/lc_pthreads.c

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#include <bits/pthreadtypes.h>
#include <math.h>
#include <pthread.h>
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#include <stdio.h>
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#include <stdlib.h>
#include <string.h>
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#include "common.h"
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struct data *data;
struct labels *labels;
FLOAT *w, *new_w, *inner_calc;
int thread_count;
struct thread_ctx {
int start, end;
};
void *each_thread(void *);
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int main(int argc, char **argv) {
if (argc < 5) {
fprintf(stderr,
"USAGE: %s data_file label_file outer_iterations thread_count",
argv[0]);
exit(1);
}
char *data_file_name = argv[1], *label_file_name = argv[2];
int outer_iterations = atoi(argv[3]);
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thread_count = atoi(argv[4]);
data = read_data(data_file_name);
labels = read_labels(label_file_name);
if (data->dimensions < thread_count)
thread_count = data->dimensions;
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pthread_t *thread_pool = malloc(thread_count * sizeof(pthread_t));
int *wtf = malloc(thread_count * sizeof(int));
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w = calloc(data->dimensions, sizeof(FLOAT));
new_w = calloc(data->dimensions, sizeof(FLOAT));
inner_calc = calloc(data->dimensions * data->rows, sizeof(FLOAT));
printf("Running %d iteration(s) with %d thread(s).\n", outer_iterations,
thread_count);
double program_start_time = monotonic_seconds();
double total_compute_time = 0;
for (int iter = 0; iter < outer_iterations; iter++) {
double iter_start_time = monotonic_seconds();
// Spawn N threads
for (int t = 0; t < thread_count; ++t) {
wtf[t] = t;
pthread_create(&thread_pool[t], NULL, each_thread, &wtf[t]);
}
for (int t = 0; t < thread_count; ++t) {
pthread_join(thread_pool[t], NULL);
}
double iter_end_time = monotonic_seconds();
total_compute_time += iter_end_time - iter_start_time;
printf("Iter duration (no print): %0.04fs\n",
iter_end_time - iter_start_time);
// Update w
// printf("w = [");
for (int idx = 0; idx < data->dimensions; idx++) {
w[idx] = new_w[idx];
// printf("%.3f ", w[idx]);
}
// printf("]\n");
// Compute loss
FLOAT loss_sum = 0;
for (int j = 0; j < data->rows; j++) {
FLOAT loss_value = 0;
for (int i = 0; i < data->dimensions; i++) {
loss_value += data->buf[data->rows * i + j] * w[i];
}
loss_value -= labels->buf[j];
loss_sum += loss_value * loss_value;
}
FLOAT loss = sqrt(loss_sum);
printf("Loss: %0.04f\n", loss);
}
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double program_end_time = monotonic_seconds();
printf("Program time (compute): %0.04fs\n", total_compute_time);
printf("Program time (total): %0.04fs\n",
program_end_time - program_start_time);
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free(inner_calc);
free(new_w);
free(data->buf);
free(labels->buf);
free(data);
free(labels);
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free(thread_pool);
free(wtf);
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// NOTE: NOT PART OF THE ASSIGNMENT
// Perform validation to see how well the model performs on training data
if (argc >= 7) {
struct data *test_data = read_data(argv[5]);
struct labels *test_label = read_labels(argv[6]);
int num_correct = 0;
for (int j = 0; j < test_data->rows; j++) {
FLOAT output = 0;
for (int i = 0; i < test_data->dimensions; i++) {
output += test_data->buf[test_data->rows * i + j] * w[i];
}
FLOAT correct_answer = test_label->buf[j];
FLOAT incorrect_answer = -correct_answer;
if (fabs(output - correct_answer) < fabs(output - incorrect_answer))
num_correct += 1;
}
printf("num correct: %d, out of %d (%.2f%%)\n", num_correct,
test_data->rows, (100.0 * num_correct) / test_data->rows);
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free(test_data->buf);
free(test_label->buf);
free(test_data);
free(test_label);
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}
free(w);
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return 0;
}
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void *each_thread(void *thread_num_void) {
int thread_num = *(int *)thread_num_void;
int num_iterations = data->dimensions / thread_count;
int start = num_iterations * thread_num;
int end = (thread_num == thread_count - 1)
? data->dimensions
: num_iterations * (thread_num + 1);
for (int i = start; i < end; i++) {
for (int j = 0; j < data->rows; j++) {
FLOAT x_ni_w_ni = 0;
// #pragma omp parallel for default(shared) reduction(+ : x_ni_w_ni)
for (int i2 = 0; i2 < data->dimensions; i2++) {
if (i2 == i)
continue;
x_ni_w_ni = data->buf[data->rows * i2 + j] * w[i2];
}
inner_calc[data->rows * i + j] = labels->buf[j] - x_ni_w_ni;
}
FLOAT numer = 0, denom = 0;
// #pragma omp parallel for default(shared) reduction(+ : numer, denom)
for (int j = 0; j < data->rows; j++) {
FLOAT xij = data->buf[data->rows * i + j];
numer += xij * inner_calc[data->rows * i + j];
denom += xij * xij;
}
if (denom == 0)
new_w[i] = 0;
else
new_w[i] = numer / denom;
}
}