49 lines
2.1 KiB
Swift
49 lines
2.1 KiB
Swift
import Darwin
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import Foundation
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public struct MemorySampler {
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private let total = ProcessInfo.processInfo.physicalMemory
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private let pageSize: UInt64 = {
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var size: vm_size_t = 0
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host_page_size(mach_host_self(), &size)
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return UInt64(size)
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}()
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public init() {}
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public func sample() -> MemoryUsage? {
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var stats = vm_statistics64()
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var count = mach_msg_type_number_t(MemoryLayout<vm_statistics64_data_t>.stride / MemoryLayout<integer_t>.stride)
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let kr = withUnsafeMutablePointer(to: &stats) {
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$0.withMemoryRebound(to: integer_t.self, capacity: Int(count)) {
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host_statistics64(mach_host_self(), HOST_VM_INFO64, $0, &count)
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}
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}
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guard kr == KERN_SUCCESS else { return nil }
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// 与“活动监视器”口径一致：App 内存 = internal - purgeable
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let internalPages = UInt64(stats.internal_page_count)
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let purgeable = UInt64(stats.purgeable_count)
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let app = (internalPages > purgeable ? internalPages - purgeable : 0) * pageSize
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var swap = xsw_usage()
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var swapSize = MemoryLayout<xsw_usage>.size
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let hasSwap = sysctlbyname("vm.swapusage", &swap, &swapSize, nil, 0) == 0
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let swapUsed = hasSwap ? swap.xsu_used : 0
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let swapTotal = hasSwap ? swap.xsu_total : 0
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let level = Sysctl.int("kern.memorystatus_vm_pressure_level") ?? 1
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return MemoryUsage(total: total,
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app: app,
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wired: UInt64(stats.wire_count) * pageSize,
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compressed: UInt64(stats.compressor_page_count) * pageSize,
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cached: (UInt64(stats.external_page_count) + purgeable) * pageSize,
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swapUsed: swapUsed,
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swapTotal: swapTotal,
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pressure: MemoryPressure(rawValue: level) ?? .normal,
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uncompressed: stats.total_uncompressed_pages_in_compressor * pageSize,
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swapInBytes: stats.swapins * pageSize,
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swapOutBytes: stats.swapouts * pageSize)
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}
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}
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