Ticket #1656: get_system_info_test.cpp

// Purpose: test if get_system_info suceeds.


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

#include <OS.h>

//#define VERBOSE_MODE
#ifdef VERBOSE_MODE
#   define VERBOSE(x) printf x
#   define  get_system_info_etc get_system_info_verbose 
#else
#   define VERBOSE(x) ;
#   define get_system_info_etc get_system_info_laconic
#endif


void
get_system_info_laconic(system_info& systemInfo)
{
    get_system_info(&systemInfo);
}


void
get_system_info_verbose(system_info& systemInfo)
{
    get_system_info(&systemInfo);
    printf("------------ system info ---------------\n");
    printf("available memory: \t%ld MB\n", (systemInfo.max_pages * 4096) / (1024 * 1024));
    printf("used memory: \t\t%ld MB\n", (systemInfo.used_pages * 4096) / (1024 * 1024));
    printf("free memory: \t\t%ld MB\n",
        ((systemInfo.max_pages - systemInfo.used_pages) * 4096) / (1024 * 1024));
    printf("-----------------------------------------\n");
}


int
main()
{
    system_info info;
    system_info tempInfo;
    get_system_info_etc(info);

    size_t chunkSize = 64 * 1024 * 1024;
    VERBOSE(("allocating %d MB\n", chunkSize / (1024 * 1024)));
    char* base = (char*)malloc(chunkSize);
    if (base) {
        VERBOSE(("before writing anything...\n"));
        get_system_info_etc(info);
        for (uint32 index = 0; index < chunkSize; index++)
            base[index] = 'a';
        VERBOSE(("after writing...\n"));
        get_system_info_etc(info);
        tempInfo.used_pages = info.used_pages;
        free(base);
    } else {
        fprintf(stderr, "malloc FAILED\n");
        exit(1);
    }

    VERBOSE(("memory is freed\n")); 

    get_system_info_etc(info);

    if (tempInfo.used_pages == info.used_pages) {
        // Still the get_system_info shows the allocated pages.

        printf("get_system_info: test FAILED\n");

        // Find how long the delay is.
        int numOfAdditionalGetSysInfoCalls = 0;
        bigtime_t start = system_time();
        bigtime_t stop = 0;
        while (tempInfo.used_pages == info.used_pages) {
            stop = 0;
            get_system_info(&info);
            stop = system_time();
            numOfAdditionalGetSysInfoCalls++;
            snooze(50);
        }

        // one last time
        get_system_info_verbose(info);

        printf("number of numOfAdditionalGetSysInfoCalls %d\n", numOfAdditionalGetSysInfoCalls);
        printf("delay is %ld µs\n", stop - start);
    } else
        printf("get_system_info: test PASSED\n");

    return 0;
}