dprijadi
Member
dear friends
how do i check used memory/free memory on an iOS device and how do i check which process is running on background and their memory/cpu use ? Is it possible to kill other process / apps from our app ?
Are there any Apple approved / Apple SDK that let developer do this check by calling some API ?
Regards
denny
Hi Denny,
hm, I don't think that there's an API like that, at least I haven't stumbled over one in the past. I guess that this might also have something to do with the apps running in a sandbox for security reasons -- Apple doesn't give you much information about stuff outside your app.
This might be helpful for checking the available memory.
http://stackoverflow.com/questions/2798638/available-memory-for-iphone-os-app
I've implemented something similar for my app. Which shows the free memory and used memory. But honestly, I don't know how accurate it is. I will post some code when I get time.
- (float)getMemoryUsage { 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 ) return ((float)info.resident_size/1048576.0f); else return 0; } -(float)getFreeMemory { 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"); return 0; } natural_t mem_free = vm_stat.free_count * pagesize; return ((float)mem_free/1048576.0f); }
Both methods return the memory in megabytes. This is pretty much a copy/paste from other sources. So if anyone has any corrections on the code, that would be great.
The memory stats using these methods seem semi-reliable at most, I wouldn't rely on it completely.
That's really interesting, thanks for sharing!!
I have those exact same methods almost word for word in a library class of static methods that I share between projects! Think I found them on stackoverflow or somewhere. You are right though Shilo, I have also found these methods to return really unreliable information! They are only really useful as a very rough guide to what might be going on behind the scenes.
You must log in to post.
