问题描述
我想以编程的方式随时检索iPhone App的内存使用量。是的，我注意到了ObjectAlloc/Leaks。但我对那些不感兴趣，只想知道是否可以通过写代码来获取所使用的字节量，并通过NSLog报告。谢谢！
原问题：Programmatically retrieve memory usage on iPhone
问题解答
回答1：Jason Coco：为了获得App实际使用的内存字节，你可以使用下述方式。但是，你必须要熟练掌握各种分析工具，就像它们设计了更好看的表示整体使用的图片一样。
#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)); }}
info.virtual_size中有个字段可以告诉你可用的虚拟内存的具体字节数（或者任何情况下内存分配给App的潜在虚拟内存）。Pgb链接的代码将为你提供设备的可用内存和内存类型。
Douglas K. Bell：这是加强后的report_memory()，可以在NSLog()中迅速显示内存泄漏。
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;}
