dlt-test-init-free.c

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/*
* @licence app begin@
* SPDX license identifier: MPL-2.0
*
* Copyright (C) 2011-2015, BMW AG
*
* This file is part of GENIVI Project DLT - Diagnostic Log and Trace.
*
* This Source Code Form is subject to the terms of the
* Mozilla Public License (MPL), v. 2.0.
* If a copy of the MPL was not distributed with this file,
* You can obtain one at http://mozilla.org/MPL/2.0/.
*
* For further information see http://www.genivi.org/.
* @licence end@
*/

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdbool.h>

#include "dlt_common.h"
#include "dlt_user.h"

void exec(const char* cmd, char *buffer, size_t length);
void printMemoryUsage();
char* occupyMemory(uint size);
void do_example_test();
void do_dlt_test();

int num_repetitions;

int main(int argc, char **argv)
{
    if (argc > 1)
        num_repetitions = strtol(argv[1], 0, 10);
    else
        num_repetitions = 1000;

    printf("Will do %d repetitions.\n", num_repetitions);

    //do_example_test();
    do_dlt_test();

    printf("Done.\n");

    return 0;
}

// Should increase and then decrease memory amount.
void do_example_test()
{
    const int immediatelyFree = 0;

    int numBufs = 1024;
    int sizePerBuf = 1024 * 1024; // 1MB

    char** bufs = (char**) malloc(numBufs * sizeof(char*));

    for (int i = 0; i < numBufs; i++)
    {
        bufs[i] = occupyMemory(sizePerBuf);

        printf("after alloc: ");
        printMemoryUsage();

        if (immediatelyFree)
        {
            free(bufs[i]);

            printf("after free: ");
            printMemoryUsage();
        }
    }

    printf("deleting memory:\n");

    if (!immediatelyFree)
        for (int i = 0; i < numBufs; i++)
        //for (int i = numBufs - 1; i >= 0; i--) // other way round works, too
        {
            free(bufs[i]);

            printf("after free: ");
            printMemoryUsage();
        }

    free(bufs);
}

// Should give stable amount of memory across all iterations.
void do_dlt_test()
{
    for (int i = 0; i < num_repetitions; i++)
    {
        dlt_init();
        dlt_free();

        printf("Iteration %d) - currently used memory amount: ", i);
        printMemoryUsage();
    }
}

void exec(const char* cmd, char *buffer, size_t length)
{
    FILE* pipe = NULL;
    strncpy(buffer, "ERROR", length);

    if ( (pipe = popen(cmd, "r")) == NULL )
        return;

    while (fgets(buffer, length, pipe) != NULL);

    if(pipe != NULL)
        pclose(pipe);
}

void printMemoryUsage()
{
    char result[128] = { 0 };
    char command[128] = { 0 };

    snprintf(command, sizeof(command), "pmap %d | grep total", getpid());

    exec(command, result, sizeof(result));

    printf("%s", result);
}

char* occupyMemory(uint size)
{
    char* buf = (char*) malloc(size * sizeof(char));
    for (int i = 0; i < 1; i++)
    {
        buf[i] = 1;
    }

    return buf;
}