proj: Add perf/

proj/perf/main.c

@@ -0,0 +1,33 @@
+
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>
+#include <unistd.h>
+
+int main(const int argc, const char *argv[]) {
+    if (argc != 2) {
+        fprintf(stderr, "usage: main <cycles>\n");
+        return 1;
+    }
+
+    const long cycles = strtol(argv[1], NULL, 10);
+
+    struct timespec start, end;
+    clock_gettime(CLOCK_MONOTONIC, &start);
+
+    int pipes[2];
+    for (int i = 0; i < cycles; i++) {
+        if (pipe(pipes) != 0) {
+            fprintf(stderr, "unable to create pipes: %s\n", strerror(errno));
+            exit(1);
+        }
+        close(pipes[0]);
+        close(pipes[1]);
+    }
+
+    clock_gettime(CLOCK_MONOTONIC, &end);
+    const long duration = end.tv_sec * 1000000000 + end.tv_nsec - start.tv_sec * 1000000000 - start.tv_nsec;
+    printf("start: %li.%09li\nend:   %li.%09li\nduration: %li,%03li,%03li ns\n", start.tv_sec, start.tv_nsec, end.tv_sec, end.tv_nsec, duration / 1000000, duration / 1000 % 1000, duration % 1000);
+}