How to get memory usage of my application and system in swift by programatically

Question

How to get memory usage of my application and system in swift by programatically?

not only system, but also my application

Possible duplicate of [How to profile memory usage & performance with Instruments?](http://stackoverflow.com/questions/6641540/how-to-profile-memory-usage-performance-with-instruments) — dirtydanee, Dec 06 '16 at 09:33
Did you check this one already? http://stackoverflow.com/questions/29794281/how-to-get-memory-usage-in-swift — dirtydanee, Dec 06 '16 at 09:53
@dirtydanee yes, but I don't know how to convert it to swift, and i also don't know the result is memory usage of my application or my device system — SubCycle, Dec 06 '16 at 09:56
@dirtydanee and the answer swift code in it cant build in swift3 — SubCycle, Dec 06 '16 at 09:57

score 21 · Accepted Answer · answered Dec 06 '16 at 10:13

21

For Swift 3.0 you can use the following function.

func report_memory() {
    var taskInfo = mach_task_basic_info()
    var count = mach_msg_type_number_t(MemoryLayout<mach_task_basic_info>.size)/4
    let kerr: kern_return_t = withUnsafeMutablePointer(to: &taskInfo) {
        $0.withMemoryRebound(to: integer_t.self, capacity: 1) {
            task_info(mach_task_self_, task_flavor_t(MACH_TASK_BASIC_INFO), $0, &count)
        }
    }

    if kerr == KERN_SUCCESS {
        print("Memory used in bytes: \(taskInfo.resident_size)")
    }
    else {
        print("Error with task_info(): " +
            (String(cString: mach_error_string(kerr), encoding: String.Encoding.ascii) ?? "unknown error"))
    }
}

answered Dec 06 '16 at 10:13

dirtydanee

6,081
2
27
43

thx, by the way,where can i find the documentation of the apple's Darwin api, such as `mach_task_basic_info ` `kern_return_t ` – SubCycle Dec 08 '16 at 12:22
well there is this, https://opensource.apple.com/source/xnu/xnu-2050.9.2/osfmk/mach/task_info.h , but i am not sure if there is anything else Apple specific documentation. – dirtydanee Dec 08 '16 at 12:29
3

The code works, but the value get by the code is different with other App(BMSSM/sys Status/etc). Dont know which one is correct. – DàChún Oct 06 '17 at 14:23
Values are not matched with what is shown by xcode's debugger. This function shows 36 mb where as in xcode it is 12 mb – user1101733 Mar 14 '18 at 19:04
1

The memory usage using this code shows x3 times the memory usage from the debugger. Why? – Apr 23 '18 at 09:20
1

this answer gives a wrong result. check the one below by mAc, it works correctly – Gasper J. Jan 13 '21 at 14:28
This is not a correct answer, please look below for my perfect answer. Upvote if it helps you :) – mAc Mar 24 '21 at 09:51

score 14 · Answer 2 · answered Nov 18 '20 at 13:09

Found and tested this on XCode 12.2 and Mac OS Catalina 10.15.6 and it works like charm:

func memoryFootprint() -> Float? {
    // The `TASK_VM_INFO_COUNT` and `TASK_VM_INFO_REV1_COUNT` macros are too
    // complex for the Swift C importer, so we have to define them ourselves.
    let TASK_VM_INFO_COUNT = mach_msg_type_number_t(MemoryLayout<task_vm_info_data_t>.size / MemoryLayout<integer_t>.size)
    let TASK_VM_INFO_REV1_COUNT = mach_msg_type_number_t(MemoryLayout.offset(of: \task_vm_info_data_t.min_address)! / MemoryLayout<integer_t>.size)
    var info = task_vm_info_data_t()
    var count = TASK_VM_INFO_COUNT
    let kr = withUnsafeMutablePointer(to: &info) { infoPtr in
        infoPtr.withMemoryRebound(to: integer_t.self, capacity: Int(count)) { intPtr in
            task_info(mach_task_self_, task_flavor_t(TASK_VM_INFO), intPtr, &count)
        }
    }
    guard
        kr == KERN_SUCCESS,
        count >= TASK_VM_INFO_REV1_COUNT
    else { return nil }
    
    let usedBytes = Float(info.phys_footprint)
    return usedBytes
    
}

func formattedMemoryFootprint() -> String {
    let usedBytes: UInt64? = UInt64(self.memoryFootprint() ?? 0)
    let usedMB = Double(usedBytes ?? 0) / 1024 / 1024
    let usedMBAsString: String = "Memory Used by App: \(usedMB)MB"
    return usedMBAsString
}

Hope this helps someone too :)

Are you using a windows machine or other to develop an iOS app? — mAc, Nov 26 '21 at 07:05
For those who are wondering: This code returns the memory usage of the app that runs it. It is not returning the overall systems memory usage. How would we do that? — ixany, Jul 31 '22 at 13:03

score 6 · Answer 3 · answered Oct 13 '21 at 14:05

mAc's answers but without force unwrapping:

func memoryFootprint() -> String {
    // The `TASK_VM_INFO_COUNT` and `TASK_VM_INFO_REV1_COUNT` macros are too
    // complex for the Swift C importer, so we have to define them ourselves.
    let TASK_VM_INFO_COUNT = mach_msg_type_number_t(MemoryLayout<task_vm_info_data_t>.size / MemoryLayout<integer_t>.size)
    guard let offset = MemoryLayout.offset(of: \task_vm_info_data_t.min_address) else {return "memory: NA"}
    let TASK_VM_INFO_REV1_COUNT = mach_msg_type_number_t(offset / MemoryLayout<integer_t>.size)
    var info = task_vm_info_data_t()
    var count = TASK_VM_INFO_COUNT
    let kr = withUnsafeMutablePointer(to: &info) { infoPtr in
        infoPtr.withMemoryRebound(to: integer_t.self, capacity: Int(count)) { intPtr in
            task_info(mach_task_self_, task_flavor_t(TASK_VM_INFO), intPtr, &count)
        }
    }
    guard
        kr == KERN_SUCCESS,
        count >= TASK_VM_INFO_REV1_COUNT
    else { return "memory: NA" }
    
    let usedBytes = Float(info.phys_footprint)
    let usedBytesInt: UInt64 = UInt64(usedBytes)
    let usedMB = usedBytesInt / 1024 / 1024
    let usedMBAsString: String = "memory: \(usedMB) MB"
    return usedMBAsString
}

How to get memory usage of my application and system in swift by programatically

3 Answers3

Linked