xref/libmicro/memrand.c

/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms
 * of the Common Development and Distribution License
 * (the "License").  You may not use this file except
 * in compliance with the License.
 *
 * You can obtain a copy of the license at
 * src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing
 * permissions and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL
 * HEADER in each file and include the License file at
 * usr/src/OPENSOLARIS.LICENSE.  If applicable,
 * add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your
 * own identifying information: Portions Copyright [yyyy]
 * [name of copyright owner]
 *
 * CDDL HEADER END
 */

/*
 * Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

/*
 * memory access time check
 */

#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <fcntl.h>
#include <string.h>

#include "libmicro.h"

static long opts = 1024*1024;

typedef struct {
    long            **ts_data;
    long            ts_result;
} tsd_t;

int
benchmark_init()
{
    lm_tsdsize = sizeof (tsd_t);

    (void) sprintf(lm_optstr, "s:");

    (void) sprintf(lm_usage,
        "       [-s size] number of bytes to "
        " access (default %ld)\n"
        "notes: measures \"random\" memory access times\n",
        opts);

    (void) sprintf(lm_header, "%8s", "size");

    return (0);
}

int
benchmark_optswitch(int opt, char *optarg)
{
    switch (opt) {
    case 's':
        opts = sizetoint(optarg);
        break;
    default:
        return (-1);
    }

    return (0);
}

int
benchmark_initworker(void *tsd)
{
    tsd_t           *ts = (tsd_t *)tsd;
    int i, j;

    ts->ts_data = malloc(opts);

    if (ts->ts_data == NULL) {
        return (1);
    }

    /*
     * use lmbench style backwards stride
     */

    for (i = 0; i < opts / sizeof (long); i++) {
        j = i - 128;
        if (j < 0)
            j = j + opts / sizeof (long);
        ts->ts_data[i] = (long *)&(ts->ts_data[j]);
    }
    return (0);
}

int
benchmark(void *tsd, result_t *res)
{
    tsd_t           *ts = (tsd_t *)tsd;
    int         i;

    long **ptr = ts->ts_data;


    for (i = 0; i < lm_optB; i += 10) {
        ptr = (long **)*ptr;
        ptr = (long **)*ptr;
        ptr = (long **)*ptr;
        ptr = (long **)*ptr;
        ptr = (long **)*ptr;
        ptr = (long **)*ptr;
        ptr = (long **)*ptr;
        ptr = (long **)*ptr;
        ptr = (long **)*ptr;
        ptr = (long **)*ptr;
    }

    ts->ts_result = (long)*ptr;

    res->re_count = lm_optB;

    return (0);
}

char *
benchmark_result()
{
    static char  result[256];

    (void) sprintf(result, "%8ld ", opts);


    return (result);
}