benchmark.c

void run_benchmark() {
    int target = 2600000 * 5;
    int blockSize = sizeof(buffer);
    while (blockSize >= 256) {
        //Do benchmark
        FILE* output = fopen("/sdcard/out.bin", "wb");
        int64_t start = esp_timer_get_time();
        int remaining = target;
        while (remaining > 0) {
            remaining -= fwrite(buffer, 1, blockSize > remaining ? remaining : blockSize, output);
        }
        int64_t end = esp_timer_get_time();
        fclose(output);

        //Log timing info
        double speed = target / ((end - start) / 1000000.0);
        printf("BS %i -> %f KB/sec\n", blockSize, (float)(speed / 1024));

        //Prepare next test
        blockSize /= 2;
    }
}