Get memory used by the GPU in iOS - ios

Question

How can I get the RAM memory used by the GPU (video) in iOS?
I am able to get the following memory stats: active_count, inactive_count, wire_count, free_count, but not the video used memory.

Answer 1

First of all this is the method I use to obtain the memory usage:
#import <mach/mach_host.h>
NSDictionary* getMemoryState (){
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) * (unsigned int) pagesize;
natural_t mem_free = vm_stat.free_count * (unsigned int)pagesize;
natural_t mem_total = mem_used + mem_free;
//NSLog(#"used: %u free: %u total: %u active: %u video: %u", mem_used / 1024 /1024, mem_free / 1024 /1024, mem_total / 1024 /1024, vm_stat.active_count, 999 - (mem_total / 1024 /1024));
NSMutableDictionary *dictWithMemoryStats = [[NSMutableDictionary alloc] initWithObjectsAndKeys:
[NSNumber numberWithInt:mem_total / 1024 / 1024] , #"total",
[NSNumber numberWithInt:mem_used / 1024 / 1024], #"used",
[NSNumber numberWithInt:mem_free / 1024 / 1024], #"free",
[NSNumber numberWithInt:((vm_stat.active_count * (unsigned int) pagesize) / 1024 / 1024)], #"active",
[NSNumber numberWithInt:(vm_stat.inactive_count * (unsigned int) pagesize) / 1024 /1014], #"inactive",
[NSNumber numberWithInt:(vm_stat.wire_count * (unsigned int) pagesize) / 1024/ 1024], #"wire",
nil];
return dictWithMemoryStats;
}
Then, to obtain the memory occupied by the GPU you must get the Total RAM memory of the device from which you subtract the total memory obtained from the method above.
let dictWithRamInfi: NSDictionary = getMemoryState()
let proInfo = NSProcessInfo.processInfo()
let totalRam: UInt64 = ((proInfo.physicalMemory / 1024) / 1024)
let totalActiveRam: UInt64 = UInt64(dictWithRamInfi["total"]!.unsignedLongLongValue)
let videoRam = totalRam - totalActiveRam