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chore: add struct array traversal benchmark

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Co-authored-by: blueloveTH <28104173+blueloveTH@users.noreply.github.com>
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copilot-swe-agent[bot] 2026-01-04 04:58:56 +00:00
parent 8d1d7769b5
commit 7c7675b9d6
2 changed files with 53 additions and 0 deletions
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benchmarks/struct_array_traverse Executable file
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benchmarks/struct_array_traverse.c Normal file
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#define _POSIX_C_SOURCE 199309L
#include <stdint.h>
#include <stdio.h>
#include <time.h>
static inline uint64_t nanos(void) {
struct timespec ts;
clock_gettime(CLOCK_MONOTONIC, &ts);
return (uint64_t)ts.tv_sec * 1000000000ull + (uint64_t)ts.tv_nsec;
}
static uint64_t bench_int(void) {
int arr[1000];
for (int i = 0; i < 1000; ++i) arr[i] = 1;
volatile long long total = 0;
uint64_t start = nanos();
for (int round = 0; round < 1000; ++round) {
long long sum = 0;
for (int i = 0; i < 1000; ++i) sum += arr[i];
total += sum;
}
uint64_t end = nanos();
// prevent optimization
if (total == 0) printf("unused: %lld\n", total);
return (end - start) / 1000;
}
static uint64_t bench_char(void) {
char arr[1000];
for (int i = 0; i < 1000; ++i) arr[i] = 1;
volatile long long total = 0;
uint64_t start = nanos();
for (int round = 0; round < 1000; ++round) {
long long sum = 0;
for (int i = 0; i < 1000; ++i) sum += arr[i];
total += sum;
}
uint64_t end = nanos();
if (total == 0) printf("unused: %lld\n", total);
return (end - start) / 1000;
}
int main(void) {
uint64_t int_avg = bench_int();
uint64_t char_avg = bench_char();
printf("int[1000] average traversal (ns): %llu\n",
(unsigned long long)int_avg);
printf("char[1000] average traversal (ns): %llu\n",
(unsigned long long)char_avg);
return 0;
}