About the stats on memory usage #245

lifution · 2026-02-02T09:25:11Z

lifution
Feb 2, 2026

I've noticed that DebugSwift's stats for memory usage are much higher than in Xcode Memory Gauge. Then I changed the code in DebugSwift that counts memory usage to the following code:

nonisolated private func memory() -> CGFloat {
    var info = task_vm_info_data_t()
    var count = mach_msg_type_number_t(MemoryLayout<task_vm_info_data_t>.size / MemoryLayout<natural_t>.size)
    let result = withUnsafeMutablePointer(to: &info) {
        $0.withMemoryRebound(to: integer_t.self, capacity: Int(count)) {
            task_info(mach_task_self_, task_flavor_t(TASK_VM_INFO), $0, &count)
        }
    }
    return result == KERN_SUCCESS ? CGFloat(info.phys_footprint) / 1024.0 / 1024.0 : 0
}

This code counts almost the same memory usage as in Xcode Memory Gauge.

I would like to know which stats should I use?
Thanks.

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lifution Feb 2, 2026

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lifution
Feb 2, 2026