test.c

#include <stdio.h>
#include <stdint.h>
#include <string.h>
#include <unistd.h>
#include <time.h>
#include <stddef.h>

#include "pearsonb.h"

#define NUM_ITER        300000
#define PACKET_SIZE     1024


typedef int64_t timestamp_t;


timestamp_t get_timestamp(void) {

    struct timespec ts;
    clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &ts);

    return ts.tv_sec * 1000000000LL + ts.tv_nsec;
}


int main(int argc, char* argv[]) {

    uint8_t packet[PACKET_SIZE] = { 0 };
    uint32_t null_data  =   0;

    fprintf(stdout, "the following lines should read the same:\n");
    fprintf(stdout, "0x00000000 --> 0x70c07dba74b290276c8614b6b58b9adfbb23bc9ded464c447b98493ea2c0efb7\n");

    pearson_hash_init();

    fprintf(stdout, "0x");
    for(size_t j = 0; j < 4; j++)
        fprintf(stdout, "%02x",packet[j]);
    fprintf(stdout, " --> 0x");

    pearson_hash_256(packet, packet, 4);
    for(int j = 0; j < 32; j++)
        fprintf(stdout, "%02x",packet[j]);
    fprintf(stdout, "\n");

    memset(packet, 0, sizeof (packet));
    pearson_hash_128 (packet, packet, 4);
    fprintf(stdout, "               0x................................");
    for(int j=0; j < 16;j++)
        fprintf(stdout, "%02x",packet[j]);
    fprintf(stdout, "\n");

    fprintf(stdout, "               0x................................................%16llx\n",
                    pearson_hash_64((uint8_t*)&null_data, 4));

    fprintf(stdout, "               0x........................................................%08x\n",
                    pearson_hash_32((uint8_t*)&null_data, 4));

    timestamp_t start, end;

    start = get_timestamp();
    for(uint32_t i = 0; i < NUM_ITER; i++)
        *(uint32_t*)packet = pearson_hash_32(packet, sizeof (packet));
    end = get_timestamp();
    fprintf(stderr, "throughput  32-bit hashing: %7.1f MB/s\n",
                    sizeof (packet) * (float)NUM_ITER / 1024.0 / 1024.0 /
                    (end - start) * 1000000000.0 );

    start = get_timestamp();
    for(uint32_t i = 0; i < NUM_ITER; i++)
        *(uint32_t*)packet = pearson_hash_64(packet, sizeof (packet));
    end = get_timestamp();
    fprintf(stderr, "throughput  64-bit hashing: %7.1f MB/s\n",
                    sizeof (packet) * (float)NUM_ITER / 1024.0 / 1024.0 /
                    (end - start) * 1000000000.0 );

    start = get_timestamp();
    for(uint32_t i = 0; i < NUM_ITER; i++)
        pearson_hash_128(packet, packet, sizeof (packet));
    end = get_timestamp();
    fprintf(stderr, "throughput 128-bit hashing: %7.1f MB/s\n",
                    sizeof (packet) * (float)NUM_ITER / 1024.0 / 1024.0 /
                    (end - start) * 1000000000.0 );

    start = get_timestamp();
    for(uint32_t i = 0; i < NUM_ITER; i++)
        pearson_hash_256(packet, packet, sizeof (packet));
    end = get_timestamp();
    fprintf(stderr, "throughput 256-bit hashing: %7.1f MB/s\n",
                    sizeof (packet) * (float)NUM_ITER / 1024.0 / 1024.0 /
                    (end - start) * 1000000000.0 );

    return 0;
}