d7fcda345d
- Rename source module from RDReaderView to RDEpubReaderView - Move all source files from Sources/RDReaderView/ to Sources/RDEpubReaderView/ - Update podspec: RDReaderView.podspec -> RDEpubReaderView.podspec - Update Podfile, demo project, and CocoaPods config for new pod name - Delete old RDReaderView pod support files from ReadViewDemo/Pods - Add new RDEpubReaderView pod support files - Update documentation (API ref, architecture, UML, conventions, etc.) - Add FixedLayoutRotationTests - Update .gitignore: exclude .DS_Store, manual unpack backups, _ssoft-output
49 lines
1.8 KiB
Swift
49 lines
1.8 KiB
Swift
import Foundation
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/// Memory footprint probe for the long-chapter optimization work
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/// (Doc/LONG_CHAPTER_MEMORY_OPTIMIZATION_PLAN.md, P0-2). Enabled with the
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/// `--demo-memory-probe` launch argument; logs phys_footprint at chapter
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/// load, every 20 page turns, settings invalidation, and rotation.
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enum RDEPUBMemoryProbe {
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static let isEnabled = ProcessInfo.processInfo.arguments.contains("--demo-memory-probe")
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private static let pageTurnLogStride = 20
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/// Main-thread only (page turns are delivered on main).
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private static var pageTurnCount = 0
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static func logPageTurn() {
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guard isEnabled else { return }
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pageTurnCount += 1
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guard pageTurnCount % pageTurnLogStride == 0 else { return }
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log("pageTurn count=\(pageTurnCount)")
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}
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static func log(_ event: String) {
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guard isEnabled else { return }
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print(String(format: "[EPUB][MemoryProbe] %@ footprint=%.1fMB", event, footprintMB))
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}
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/// Current phys_footprint in MB. Cheap enough (one task_info call) to
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/// surface in the demo state snapshot for automated memory assertions.
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static var footprintMB: Double {
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Double(currentFootprint()) / 1_048_576
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}
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/// phys_footprint matches the value Xcode's memory gauge and Jetsam use.
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private static func currentFootprint() -> UInt64 {
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var info = task_vm_info_data_t()
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var count = mach_msg_type_number_t(
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MemoryLayout<task_vm_info_data_t>.size / MemoryLayout<integer_t>.size
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)
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let result = withUnsafeMutablePointer(to: &info) { pointer in
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pointer.withMemoryRebound(to: integer_t.self, capacity: Int(count)) {
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task_info(mach_task_self_, task_flavor_t(TASK_VM_INFO), $0, &count)
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}
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}
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guard result == KERN_SUCCESS else { return 0 }
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return info.phys_footprint
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}
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}
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