Added pycrc library (MIT License) for CRC calculations to the repository.
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Christian Sltrop
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c35e26f025
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24 changed files with 6136 additions and 0 deletions
152
pycrc/test/performance.sh
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152
pycrc/test/performance.sh
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#!/bin/bash
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set -e
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PYCRC=`dirname $0`/../pycrc.py
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function cleanup {
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rm -f a.out performance.c crc_bbb.[ch] crc_bbf.[ch] crc_tbl.[ch] crc_tb4.[ch]
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}
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trap cleanup 0 1 2 3 15
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prefix=bbb
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$PYCRC --model crc-32 --symbol-prefix crc_${prefix}_ --generate c -o crc_$prefix.c --algo bit-by-bit
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$PYCRC --model crc-32 --symbol-prefix crc_${prefix}_ --generate h -o crc_$prefix.h --algo bit-by-bit
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prefix=bbf
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$PYCRC --model crc-32 --symbol-prefix crc_${prefix}_ --generate h -o crc_$prefix.h --algo bit-by-bit-fast
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$PYCRC --model crc-32 --symbol-prefix crc_${prefix}_ --generate c -o crc_$prefix.c --algo bit-by-bit-fast
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prefix=tbl
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$PYCRC --model crc-32 --symbol-prefix crc_${prefix}_ --generate h -o crc_$prefix.h --algo table-driven
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$PYCRC --model crc-32 --symbol-prefix crc_${prefix}_ --generate c -o crc_$prefix.c --algo table-driven
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prefix=tb4
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$PYCRC --model crc-32 --symbol-prefix crc_${prefix}_ --generate h -o crc_$prefix.h --algo table-driven --table-idx-width 4
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$PYCRC --model crc-32 --symbol-prefix crc_${prefix}_ --generate c -o crc_$prefix.c --algo table-driven --table-idx-width 4
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function print_main {
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cat <<EOF
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#include "crc_bbb.h"
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#include "crc_bbf.h"
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#include "crc_tbl.h"
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#include "crc_tb4.h"
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#include <stdio.h>
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#include <stdbool.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/times.h>
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#include <unistd.h>
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#define NUM_RUNS (256*256)
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unsigned char buf[1024];
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void test_bbb(unsigned char *buf, size_t buf_len, size_t num_runs, clock_t clock_per_sec);
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void test_bbf(unsigned char *buf, size_t buf_len, size_t num_runs, clock_t clock_per_sec);
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void test_tbl(unsigned char *buf, size_t buf_len, size_t num_runs, clock_t clock_per_sec);
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void test_tb4(unsigned char *buf, size_t buf_len, size_t num_runs, clock_t clock_per_sec);
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/**
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* Print results.
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*
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* \param dsc Description of the test
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* \param crc Resulting CRC
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* \param buflen Length of one buffer
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* \param num_runs Number of runs over that buffer
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* \param t_user user time
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* \param t_sys system time
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* \return void
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*****************************************************************************/
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void show_times(const char *dsc, unsigned int crc, size_t buflen, size_t num_runs, double t_user, double t_sys)
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{
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printf("%s of %ld bytes (%ld * %ld): 0x%08x\n", dsc, (long)buflen*num_runs, (long)buflen, (long)num_runs, crc);
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printf("%13s: %7.3f s\n", "user time", t_user);
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printf("%13s: %7.3f s\n", "system time", t_sys);
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printf("\n");
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}
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/**
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* C main function.
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*
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* \retval 0 on success
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* \retval 1 on failure
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*****************************************************************************/
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int main(void)
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{
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unsigned int i;
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long int clock_per_sec;
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for (i = 0; i < sizeof(buf); i++) {
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buf[i] = (unsigned char)rand();
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}
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clock_per_sec = sysconf(_SC_CLK_TCK);
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// bit-by-bit
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test_bbb(buf, sizeof(buf), NUM_RUNS, clock_per_sec);
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// bit-by-bit-fast
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test_bbf(buf, sizeof(buf), NUM_RUNS, clock_per_sec);
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// table-driven
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test_tbl(buf, sizeof(buf), NUM_RUNS, clock_per_sec);
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// table-driven idx4
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test_tb4(buf, sizeof(buf), NUM_RUNS, clock_per_sec);
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return 0;
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}
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EOF
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}
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function print_routine {
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algo=$1
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prefix=$2
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cat <<EOF
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/**
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* Test $algo Algorithm.
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*
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* \return void
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*****************************************************************************/
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void test_${prefix}(unsigned char *buf, size_t buf_len, size_t num_runs, clock_t clock_per_sec)
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{
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crc_${prefix}_t crc;
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unsigned int i, j;
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struct tms tm1, tm2;
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times(&tm1);
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crc = crc_${prefix}_init();
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for (i = 0; i < num_runs; i++) {
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crc = crc_${prefix}_update(crc, buf, buf_len);
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}
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crc = crc_${prefix}_finalize(crc);
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times(&tm2);
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show_times("CRC32, $algo, block-wise", crc, buf_len, num_runs,
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((double)(tm2.tms_utime - tm1.tms_utime) / (double)clock_per_sec),
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((double)(tm2.tms_stime - tm1.tms_stime) / (double)clock_per_sec));
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times(&tm1);
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crc = crc_${prefix}_init();
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for (i = 0; i < num_runs; i++) {
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for (j = 0; j < buf_len; j++) {
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crc = crc_${prefix}_update(crc, &buf[j], 1);
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}
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}
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crc = crc_${prefix}_finalize(crc);
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times(&tm2);
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show_times("CRC32, $algo, byte-wise", crc, buf_len, num_runs,
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((double)(tm2.tms_utime - tm1.tms_utime) / (double)clock_per_sec),
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((double)(tm2.tms_stime - tm1.tms_stime) / (double)clock_per_sec));
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}
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EOF
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}
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print_main > performance.c
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print_routine "bit-by-bit" bbb >> performance.c
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print_routine "bit-by-bit-fast" bbf >> performance.c
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print_routine "table-driven" tbl >> performance.c
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print_routine "table-driven idx4" tb4 >> performance.c
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gcc -W -Wall -O3 crc_bbb.c crc_bbf.c crc_tbl.c crc_tb4.c performance.c
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./a.out
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