63 lines
2.1 KiB
C
63 lines
2.1 KiB
C
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// vm_profile_system.c - Detailed profiling for system malloc
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <time.h>
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#define ITERATIONS 10
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#define SIZE (2 * 1024 * 1024)
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static double timespec_diff_ms(struct timespec *start, struct timespec *end) {
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return (end->tv_sec - start->tv_sec) * 1000.0 +
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(end->tv_nsec - start->tv_nsec) / 1000000.0;
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}
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int main(void) {
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struct timespec t_start, t_end;
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double total_alloc_time = 0.0;
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double total_memset_time = 0.0;
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double total_free_time = 0.0;
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printf("=== VM Scenario Detailed Profile (SYSTEM MALLOC) ===\n");
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printf("Size: %d bytes (2MB)\n", SIZE);
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printf("Iterations: %d\n\n", ITERATIONS);
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for (int i = 0; i < ITERATIONS; i++) {
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// Time: Allocation
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clock_gettime(CLOCK_MONOTONIC, &t_start);
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void* buf = malloc(SIZE);
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clock_gettime(CLOCK_MONOTONIC, &t_end);
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double alloc_ms = timespec_diff_ms(&t_start, &t_end);
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total_alloc_time += alloc_ms;
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// Time: memset (simulate usage)
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clock_gettime(CLOCK_MONOTONIC, &t_start);
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memset(buf, 0xEF, SIZE);
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clock_gettime(CLOCK_MONOTONIC, &t_end);
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double memset_ms = timespec_diff_ms(&t_start, &t_end);
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total_memset_time += memset_ms;
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// Time: Free
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clock_gettime(CLOCK_MONOTONIC, &t_start);
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free(buf);
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clock_gettime(CLOCK_MONOTONIC, &t_end);
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double free_ms = timespec_diff_ms(&t_start, &t_end);
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total_free_time += free_ms;
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printf("Iter %2d: alloc=%.3f ms, memset=%.3f ms, free=%.3f ms\n",
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i, alloc_ms, memset_ms, free_ms);
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}
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printf("\n=== Summary ===\n");
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printf("Total alloc time: %.3f ms (avg: %.3f ms)\n",
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total_alloc_time, total_alloc_time / ITERATIONS);
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printf("Total memset time: %.3f ms (avg: %.3f ms)\n",
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total_memset_time, total_memset_time / ITERATIONS);
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printf("Total free time: %.3f ms (avg: %.3f ms)\n",
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total_free_time, total_free_time / ITERATIONS);
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printf("Total time: %.3f ms\n",
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total_alloc_time + total_memset_time + total_free_time);
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return 0;
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}
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