IOS内存等信息

1. 获取IOS APP占用的内存

#import <mach/mach.h>// ...void report_memory(void) {struct task_basic_info info;mach_msg_type_number_t size = sizeof(info);kern_return_t kerr = task_info(mach_task_self(),TASK_BASIC_INFO,(task_info_t)&info,&size);if( kerr == KERN_SUCCESS ) {NSLog(@"Memory in use (in bytes): %u", info.resident_size);} else {NSLog(@"Error with task_info(): %s", mach_error_string(kerr));}
}

void report_memory(void) {static unsigned last_resident_size=0;static unsigned greatest = 0;static unsigned last_greatest = 0;struct task_basic_info info;mach_msg_type_number_t size = sizeof(info);kern_return_t kerr = task_info(mach_task_self(),TASK_BASIC_INFO,(task_info_t)&info,&size);if( kerr == KERN_SUCCESS ) {int diff = (int)info.resident_size - (int)last_resident_size;unsigned latest = info.resident_size;if( latest > greatest   )   greatest = latest;  // track greatest mem usageint greatest_diff = greatest - last_greatest;int latest_greatest_diff = latest - greatest;NSLog(@"Mem: %10u (%10d) : %10d :   greatest: %10u (%d)", info.resident_size, diff,latest_greatest_diff,greatest, greatest_diff  );} else {NSLog(@"Error with task_info(): %s", mach_error_string(kerr));}last_resident_size = info.resident_size;last_greatest = greatest;
}

void report_memory(void)
{struct mach_task_basic_info info;mach_msg_type_number_t size = MACH_TASK_BASIC_INFO_COUNT;kern_return_t kerr = task_info(mach_task_self(),MACH_TASK_BASIC_INFO,(task_info_t)&info,&size);if( kerr == KERN_SUCCESS ) {NSLog(@"Memory in use (in bytes): %u", info.resident_size);} else {NSLog(@"Error with task_info(): %s", mach_error_string(kerr));}
}

//test 1struct mach_task_basic_info info;mach_msg_type_number_t size = MACH_TASK_BASIC_INFO_COUNT;kern_return_t kerr = task_info(mach_task_self(),MACH_TASK_BASIC_INFO,(task_info_t)&info,&size);if( kerr == KERN_SUCCESS ) {CCLOG("Memory in use (in bytes): %llu", info.resident_size);} else {CCLOG("Error with task_info()");}//test 2mach_port_t            host_port = mach_host_self();mach_msg_type_number_t host_size = sizeof(vm_statistics_data_t) / sizeof(integer_t);vm_size_t              pagesize;vm_statistics_data_t   vm_stat;host_page_size(host_port, &pagesize);
//    host_statistics(host_t host_priv, host_flavor_t flavor, host_info_t host_info_out, <#mach_msg_type_number_t *host_info_outCnt#>)
//    host_statistics64(host_t host_priv, host_flavor_t flavor, host_info64_t host_info64_out, mach_msg_type_number_t *host_info64_outCnt)int r = host_statistics(host_port, HOST_VM_INFO, (host_info64_t)&vm_stat, &host_size);if (r != KERN_SUCCESS)CCLOG("Failed to fetch vm statistics");float active = (float)(vm_stat.active_count * pagesize) / 1048576.0f;float inactive = (float)(vm_stat.inactive_count * pagesize)/1048576.0f;float wire = (float)(vm_stat.wire_count * pagesize)/1048576.0f;unsigned long int  mem_used = (vm_stat.active_count + vm_stat.inactive_count + vm_stat.wire_count) * pagesize;unsigned long int  mem_free = vm_stat.free_count * pagesize;unsigned long int  mem_total = mem_used + mem_free;CCLOG("page size: %u", pagesize);CCLOG("memory active: %f, memory inactive: %f, memory wire: %f", active, inactive, wire);CCLOG("memory used: %lu, memory free: %lu, memory total: %lu", mem_used, mem_free, mem_total);

Resident memory is a measurement of the memory that has been allocated to your application and has not yet been reclaimed by the system, but some/most of the resident memory could be reclaimed by the system.

http://stackoverflow.com/questions/18642421/understanding-task-basic-info-task-resident-size

http://stackoverflow.com/questions/787160/programmatically-retrieve-memory-usage-on-iphone