While I'm trying to get energy trace file from xcode instrument through command line using below commands, sometimes Iam getting empty files , why so?instruments -t "Activity Monitor" -D /users/nftcoe/Desktop/Instru.trace -w

While I'm trying to get energy trace file from xcode instrument through command line using below commands, sometimes Iam getting empty files , why so?instruments -t "Energy Log" -D /users/nftcoe/Desktop/Instru.trace -w

I have used below code. It is matching with Xcode memory monitor but not matching with the Xcode instrument allocation result.func memoryFootprint() -> mach_vm_size_t? { 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 } return info.phys_footprint}