[CT420]: Assignment 2 move benchmarks

year4/semester2/CT420/assignments/assignment2/code/benchmarks/merged.c

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+// Compile code with gcc -o bm1 bm1.c -lrt -Wall -O2
+// Execute code with sudo ./bm1
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <time.h>
+#include <signal.h>
+#include <sys/mman.h>
+#include <unistd.h>
+#include <sched.h>
+#include <errno.h>
+#include <string.h>
+#include <limits.h>
+
+#define ITERATIONS 10000
+#define NS_PER_SEC 1000000000L
+
+timer_t timer_id;
+volatile sig_atomic_t timer_expired = 0;
+volatile sig_atomic_t signal_received = 0;
+struct timespec start, end, sleep_time;
+
+void save_results(const char *filename, long long *data) {
+    FILE *file = fopen(filename, "w");
+    if (!file) {
+        perror("fopen");
+        exit(EXIT_FAILURE);
+    }
+    fprintf(file, "Iteration,Latency/Jitter (ns)\n");
+    for (int i = 0; i < ITERATIONS; i++) {
+        fprintf(file, "%d,%lld\n", i, data[i]);
+    }
+    fclose(file);
+}
+
+void signal_handler(int signum) {
+    signal_received = 1;
+	clock_gettime(CLOCK_MONOTONIC, &end);
+}
+
+void timer_handler(int signum) {
+    timer_expired = 1;
+    clock_gettime(CLOCK_MONOTONIC, &end);
+}
+
+void configure_realtime_scheduling() {
+    struct sched_param param;
+    param.sched_priority = sched_get_priority_max(SCHED_FIFO);
+    if (sched_setscheduler(0, SCHED_FIFO, &param) == -1) {
+        perror("sched_setscheduler");
+        exit(EXIT_FAILURE);
+    }
+}
+
+void lock_memory() {
+    if (mlockall(MCL_CURRENT | MCL_FUTURE) == -1) {
+        perror("mlockall");
+        exit(EXIT_FAILURE);
+    }
+}
+
+void benchmark_nanosleep() {
+    long long jitter_data[ITERATIONS];
+    sleep_time.tv_sec = 0;
+    sleep_time.tv_nsec = 1000000; // 1 ms
+
+    for (int i = 0; i < ITERATIONS; i++) {
+        clock_gettime(CLOCK_MONOTONIC, &start);
+        nanosleep(&sleep_time, NULL);
+        clock_gettime(CLOCK_MONOTONIC, &end);
+
+        jitter_data[i] = ((end.tv_sec - start.tv_sec) * NS_PER_SEC + (end.tv_nsec - start.tv_nsec)) - sleep_time.tv_nsec;
+    }
+    save_results("nanosleep.csv", jitter_data);
+}
+
+void benchmark_signal_latency() {
+    long long latency_data[ITERATIONS];
+    signal(SIGUSR1, signal_handler);
+
+    for (int i = 0; i < ITERATIONS; i++) {
+        clock_gettime(CLOCK_MONOTONIC, &start);
+        kill(getpid(), SIGUSR1);
+        while (!signal_received);
+
+        latency_data[i] = (end.tv_sec - start.tv_sec) * NS_PER_SEC + (end.tv_nsec - start.tv_nsec);
+        signal_received = 0;
+    }
+    save_results("signal_latency.csv", latency_data);
+}
+
+void benchmark_timer() {
+    long long jitter_data[ITERATIONS];
+    struct sigevent sev;
+    sev.sigev_notify = SIGEV_SIGNAL;
+    sev.sigev_signo = SIGRTMIN;
+    sev.sigev_value.sival_ptr = &timer_id;
+
+    if (timer_create(CLOCK_MONOTONIC, &sev, &timer_id) == -1) {
+        perror("timer_create");
+        exit(EXIT_FAILURE);
+    }
+
+    struct itimerspec its;
+    its.it_value.tv_sec = 0;
+    its.it_value.tv_nsec = 1000000; // 1 ms
+    its.it_interval = its.it_value;
+    signal(SIGRTMIN, timer_handler);
+
+    if (timer_settime(timer_id, 0, &its, NULL) == -1) {
+        perror("timer_settime");
+        exit(EXIT_FAILURE);
+    }
+    clock_gettime(CLOCK_MONOTONIC, &start);
+    for (int i = 0; i < ITERATIONS; i++) {
+        while (!timer_expired) {
+            struct timespec ts = {0, 100};
+            nanosleep(&ts, NULL);
+        }
+
+        clock_gettime(CLOCK_MONOTONIC, &end);
+        jitter_data[i] = ((end.tv_sec - start.tv_sec) * NS_PER_SEC + (end.tv_nsec - start.tv_nsec)) - its.it_interval.tv_nsec;
+        timer_expired = 0;
+        start = end;
+    }
+    save_results("timer.csv", jitter_data);
+}
+
+void benchmark_usleep() {
+    long long jitter_data[ITERATIONS];
+
+    for (int i = 0; i < ITERATIONS; i++) {
+        clock_gettime(CLOCK_MONOTONIC, &start);
+        usleep(1000); // 1 ms
+        clock_gettime(CLOCK_MONOTONIC, &end);
+
+        jitter_data[i] = ((end.tv_sec - start.tv_sec) * NS_PER_SEC + (end.tv_nsec - start.tv_nsec)) - 1000000;
+    }
+    save_results("usleep.csv", jitter_data);
+}
+
+int main() {
+    configure_realtime_scheduling();
+    lock_memory();
+
+    printf("Getting nanosleep benchmark\n");
+    benchmark_nanosleep();
+
+    printf("Getting signal benchmark\n");
+    benchmark_signal_latency();
+
+    printf("Getting timer benchmark\n");
+    benchmark_timer();
+
+    printf("Getting usleep benchmark\n");
+    benchmark_usleep();
+
+    return 0;
+}