ios iPhone/iPad 实时获取内存使用情况

bool UserProfile::GetMemory(double & free2, double & total2)

{

size_t length;

int mib[6];

int result;

int pagesize;

mib[0] = CTL_HW;

mib[1] = HW_PAGESIZE;

length = sizeof(pagesize);

if (sysctl(mib, 2, &pagesize, &length, NULL, 0) < 0)

{

perror("getting page size");

}

mach_msg_type_number_t count = HOST_VM_INFO_COUNT;

vm_statistics_data_t vmstat;

if (host_statistics(mach_host_self(), HOST_VM_INFO, (host_info_t)&vmstat, &count) != KERN_SUCCESS)

{

//RayLog("Failed to get VM statistics.");

}

double total = vmstat.wire_count + vmstat.active_count + vmstat.inactive_count + vmstat.free_count;

double wired = vmstat.wire_count / total;

double active = vmstat.active_count / total;

double inactive = vmstat.inactive_count / total;

double free = vmstat.free_count / total;

mib[0] = CTL_HW;

mib[1] = HW_PHYSMEM;

length = sizeof(result);

if (sysctl(mib, 2, &result, &length, NULL, 0) < 0)

{

perror("getting physical memory");

}

mib[0] = CTL_HW;

mib[1] = HW_USERMEM;

length = sizeof(result);

if (sysctl(mib, 2, &result, &length, NULL, 0) < 0)

{

perror("getting user memory");

}

free2 = vmstat.free_count * pagesize;

total2 = total * pagesize;

return true;

}

转自：http://hi.baidu.com/_violet_moon/item/c27bcf3d3d1cb3677d034be2