#import <mach/mach.h>
#import <mach/mach_host.h>static void print_free_memory () {mach_port_t host_port;mach_msg_type_number_t host_size;vm_size_t pagesize;host_port = mach_host_self();host_size = sizeof(vm_statistics_data_t) / sizeof(integer_t);host_page_size(host_port, &pagesize);        vm_statistics_data_t vm_stat;if (host_statistics(host_port, HOST_VM_INFO, (host_info_t)&vm_stat, &host_size) != KERN_SUCCESS)NSLog(@"Failed to fetch vm statistics");/* Stats in bytes */ natural_t mem_used = (vm_stat.active_count +vm_stat.inactive_count +vm_stat.wire_count) * pagesize;natural_t mem_free = vm_stat.free_count * pagesize;natural_t mem_total = mem_used + mem_free;NSLog(@"used: %u free: %u total: %u", mem_used, mem_free, mem_total);
}