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382 lines
9.0 KiB
382 lines
9.0 KiB
/*
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* Ones' complement checksum test & benchmark
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*
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* Copyright (c) 2016-2020, Arm Limited.
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* SPDX-License-Identifier: MIT
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*/
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#define _GNU_SOURCE
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#include <inttypes.h>
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#include <stdbool.h>
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#include <stdint.h>
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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 <sys/mman.h>
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#include <time.h>
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#include <unistd.h>
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#include "../include/networking.h"
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#if WANT_ASSERT
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#undef NDEBUG
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#include <assert.h>
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#define Assert(exp) assert(exp)
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#else
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#define Assert(exp) (void) (exp)
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#endif
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#ifdef __GNUC__
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#define may_alias __attribute__((__may_alias__))
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#else
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#define may_alias
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#endif
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#define CACHE_LINE 64
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#define ALIGN(x, y) (((x) + (y) - 1) & ~((y) - 1))
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/* Reference implementation - do not modify! */
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static uint16_t
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checksum_simple(const void *ptr, uint32_t nbytes)
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{
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const uint16_t *may_alias hptr = ptr;
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uint64_t sum = 0;/* Need 64-bit accumulator when nbytes > 64K */
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/* Sum all halfwords, assume misaligned accesses are handled in HW */
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for (uint32_t nhalfs = nbytes >> 1; nhalfs != 0; nhalfs--)
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{
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sum += *hptr++;
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}
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/* Add any trailing odd byte */
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if ((nbytes & 0x01) != 0)
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{
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sum += *(uint8_t *) hptr;
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}
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/* Fold 64-bit sum to 32 bits */
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sum = (sum & 0xffffffff) + (sum >> 32);
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sum = (sum & 0xffffffff) + (sum >> 32);
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Assert(sum == (uint32_t) sum);
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/* Fold 32-bit sum to 16 bits */
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sum = (sum & 0xffff) + (sum >> 16);
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sum = (sum & 0xffff) + (sum >> 16);
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Assert(sum == (uint16_t) sum);
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return (uint16_t) sum;
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}
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static struct
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{
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uint16_t (*cksum_fp)(const void *, uint32_t);
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const char *name;
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} implementations[] =
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{
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{ checksum_simple, "simple"},
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{ __chksum, "scalar"},
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#if __arm__
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{ __chksum_arm_simd, "simd" },
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#elif __aarch64__
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{ __chksum_aarch64_simd, "simd" },
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#endif
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{ NULL, NULL}
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};
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static int
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find_impl(const char *name)
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{
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for (int i = 0; implementations[i].name != NULL; i++)
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{
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if (strcmp(implementations[i].name, name) == 0)
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{
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return i;
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}
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}
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return -1;
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}
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static uint16_t (*CKSUM_FP)(const void *, uint32_t);
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static volatile uint16_t SINK;
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static bool
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verify(const void *data, uint32_t offset, uint32_t size)
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{
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uint16_t csum_expected = checksum_simple(data, size);
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uint16_t csum_actual = CKSUM_FP(data, size);
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if (csum_actual != csum_expected)
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{
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fprintf(stderr, "\nInvalid checksum for offset %u size %u: "
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"actual %04x expected %04x (valid)",
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offset, size, csum_actual, csum_expected);
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if (size < 65536)
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{
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/* Fatal error */
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exit(EXIT_FAILURE);
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}
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/* Else some implementations only support sizes up to 2^16 */
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return false;
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}
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return true;
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}
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static uint64_t
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clock_get_ns(void)
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{
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struct timespec ts;
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clock_gettime(CLOCK_MONOTONIC, &ts);
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return ts.tv_sec * (uint64_t) 1000000000 + ts.tv_nsec;
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}
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static void
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benchmark(const uint8_t *base,
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size_t poolsize,
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uint32_t blksize,
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uint32_t numops,
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uint64_t cpufreq)
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{
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printf("%11u ", (unsigned int) blksize); fflush(stdout);
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uint64_t start = clock_get_ns();
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for (uint32_t i = 0; i < numops; i ++)
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{
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/* Read a random value from the pool */
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uint32_t random = ((uint32_t *) base)[i % (poolsize / 4)];
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/* Generate a random starting address */
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const void *data = &base[random % (poolsize - blksize)];
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SINK = CKSUM_FP(data, blksize);
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}
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uint64_t end = clock_get_ns();
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#define MEGABYTE 1000000 /* Decimal megabyte (MB) */
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uint64_t elapsed_ns = end - start;
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uint64_t elapsed_ms = elapsed_ns / 1000000;
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uint32_t blks_per_s = (uint32_t) ((numops / elapsed_ms) * 1000);
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uint64_t accbytes = (uint64_t) numops * blksize;
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printf("%11ju ", (uintmax_t) ((accbytes / elapsed_ms) * 1000) / MEGABYTE);
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unsigned int cyc_per_blk = cpufreq / blks_per_s;
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printf("%11u ", cyc_per_blk);
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if (blksize != 0)
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{
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unsigned int cyc_per_byte = 1000 * cyc_per_blk / blksize;
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printf("%7u.%03u ",
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cyc_per_byte / 1000, cyc_per_byte % 1000);
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}
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printf("\n");
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}
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int main(int argc, char *argv[])
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{
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int c;
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bool DUMP = false;
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uint32_t IMPL = 0;/* Simple implementation */
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uint64_t CPUFREQ = 0;
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uint32_t BLKSIZE = 0;
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uint32_t NUMOPS = 1000000;
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uint32_t POOLSIZE = 512 * 1024;/* Typical ARM L2 cache size */
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setvbuf(stdout, NULL, _IOLBF, 160);
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while ((c = getopt(argc, argv, "b:df:i:n:p:")) != -1)
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{
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switch (c)
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{
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case 'b' :
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{
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int blksize = atoi(optarg);
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if (blksize < 1 || blksize > POOLSIZE / 2)
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{
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fprintf(stderr, "Invalid block size %d\n", blksize);
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exit(EXIT_FAILURE);
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}
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BLKSIZE = (unsigned) blksize;
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break;
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}
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case 'd' :
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DUMP = true;
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break;
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case 'f' :
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{
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int64_t cpufreq = atoll(optarg);
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if (cpufreq < 1)
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{
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fprintf(stderr, "Invalid CPU frequency %"PRId64"\n",
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cpufreq);
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exit(EXIT_FAILURE);
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}
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CPUFREQ = cpufreq;
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break;
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}
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case 'i' :
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{
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int impl = find_impl(optarg);
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if (impl < 0)
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{
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fprintf(stderr, "Invalid implementation %s\n", optarg);
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goto usage;
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}
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IMPL = (unsigned) impl;
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break;
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}
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case 'n' :
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{
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int numops = atoi(optarg);
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if (numops < 1)
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{
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fprintf(stderr, "Invalid number of operations %d\n", numops);
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exit(EXIT_FAILURE);
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}
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NUMOPS = (unsigned) numops;
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break;
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}
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case 'p' :
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{
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int poolsize = atoi(optarg);
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if (poolsize < 4096)
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{
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fprintf(stderr, "Invalid pool size %d\n", poolsize);
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exit(EXIT_FAILURE);
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}
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char c = optarg[strlen(optarg) - 1];
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if (c == 'M')
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{
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POOLSIZE = (unsigned) poolsize * 1024 * 1024;
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}
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else if (c == 'K')
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{
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POOLSIZE = (unsigned) poolsize * 1024;
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}
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else
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{
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POOLSIZE = (unsigned) poolsize;
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}
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break;
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}
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default :
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usage :
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fprintf(stderr, "Usage: checksum <options>\n"
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"-b <blksize> Block size\n"
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"-d Dump first 96 bytes of data\n"
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"-f <cpufreq> CPU frequency (Hz)\n"
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"-i <impl> Implementation\n"
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"-n <numops> Number of operations\n"
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"-p <poolsize> Pool size (K or M suffix)\n"
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);
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printf("Implementations:");
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for (int i = 0; implementations[i].name != NULL; i++)
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{
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printf(" %s", implementations[i].name);
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}
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printf("\n");
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exit(EXIT_FAILURE);
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}
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}
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if (optind > argc)
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{
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goto usage;
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}
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CKSUM_FP = implementations[IMPL].cksum_fp;
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POOLSIZE = ALIGN(POOLSIZE, CACHE_LINE);
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uint8_t *base = mmap(0, POOLSIZE, PROT_READ|PROT_WRITE,
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MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
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if (base == MAP_FAILED)
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{
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perror("aligned_alloc"), exit(EXIT_FAILURE);
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}
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for (size_t i = 0; i < POOLSIZE / 4; i++)
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{
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((uint32_t *) base)[i] = rand();
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}
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printf("Implementation: %s\n", implementations[IMPL].name);
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printf("numops %u, poolsize ", NUMOPS);
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if (POOLSIZE % (1024 * 1024) == 0)
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{
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printf("%uMiB", POOLSIZE / (1024 * 1024));
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}
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else if (POOLSIZE % 1024 == 0)
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{
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printf("%uKiB", POOLSIZE / 1024);
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}
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else
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{
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printf("%uB", POOLSIZE);
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}
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printf(", blocksize %u, CPU frequency %juMHz\n",
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BLKSIZE, (uintmax_t) (CPUFREQ / 1000000));
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#if WANT_ASSERT
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printf("Warning: assertions are enabled\n");
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#endif
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if (DUMP)
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{
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/* Print out first 96 bytes of data for human debugging */
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for (int i = 0; i < 96; i++)
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{
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if (i % 8 == 0)
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printf("%2u:", i);
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printf(" %02x", base[i]);
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if (i % 8 == 7)
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printf("\n");
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}
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}
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/* Verify that chosen algorithm handles all combinations of offsets and sizes */
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printf("Verifying..."); fflush(stdout);
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bool success = true;
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/* Check all (relevant) combinations of size and offset */
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for (int size = 0; size <= 256; size++)
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{
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for (int offset = 0; offset < 255; offset++)
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{
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/* Check at start of mapped memory */
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success &= verify(&base[offset], offset, size);
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/* Check at end of mapped memory */
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uint8_t *p = base + POOLSIZE - (size + offset);
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success &= verify(p, (uintptr_t) p % 64, size);
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}
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}
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/* Check increasingly larger sizes */
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for (size_t size = 1; size < POOLSIZE; size *= 2)
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{
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success &= verify(base, 0, size);
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}
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/* Check the full size, this can detect accumulator overflows */
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success &= verify(base, 0, POOLSIZE);
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printf("%s\n", success ? "OK" : "failure");
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/* Print throughput in decimal megabyte (1000000B) per second */
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if (CPUFREQ != 0)
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{
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printf("%11s %11s %11s %11s\n",
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"block size", "MB/s", "cycles/blk", "cycles/byte");
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}
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else
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{
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printf("%11s %11s %11s %11s\n",
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"block size", "MB/s", "ns/blk", "ns/byte");
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CPUFREQ = 1000000000;
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}
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if (BLKSIZE != 0)
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{
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benchmark(base, POOLSIZE, BLKSIZE, NUMOPS, CPUFREQ);
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}
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else
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{
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static const uint16_t sizes[] =
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{ 20, 42, 102, 250, 612, 1500, 3674, 9000, 0 };
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for (int i = 0; sizes[i] != 0; i++)
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{
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uint32_t numops = NUMOPS * 10000 / (40 + sizes[i]);
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benchmark(base, POOLSIZE, sizes[i], numops, CPUFREQ);
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}
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}
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if (munmap(base, POOLSIZE) != 0)
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{
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perror("munmap"), exit(EXIT_FAILURE);
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}
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return success ? EXIT_SUCCESS : EXIT_FAILURE;
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}
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