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“offloading”

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watchOS 11.2 Debug Tunnel Timeout: iPhone Connected, Watch stuck in "Waiting to Reconnect" (Xcode 16.4)

Hello, I am experiencing a critical blocking issue developing a watchOS app. While the iPhone 15 Pro Max is fully Connected via USB (confirmed green light in Network Settings), the Apple Watch Series 7 (watchOS 11.2) remains unreachable by Xcode. Mac: Mac Mini (macOS 15/16). Devices: iPhone 15 Pro Max (iOS 18+), Apple Watch Series 7 (watchOS 11.2). Xcode: 16.4 / Build 26.4. Hardware: Direct USB-C connection (USB 2.0 480Mb/s protocol). Technical Evidence of Protocol Failure: Missing Staging Folders: ~/Library/Developer/Xcode/watchOS DeviceSupport does not exist, implying the handshake fails before symbol stripping/sync begins. CoreDevice Error: Consistently receiving: Previous preparation error: A connection to this device could not be established.; Timed out while attempting to establish tunnel using negotiated network parameters. Missing Keychain Entries: No com.apple.coredevice keys found in Keychain Access, suggesting the Trusted Host handshake is incomplete. mDNS/Discovery: xcrun devicectl list devices sh

Developer Tools & Services Xcode

XPC communication between a sandboxed Network Extension and a privileged MachService

Hello, Is it possible for a Network Extension (running in its sandbox) to act as a client for an XPC service hosted by a Launch Daemon (e.g., to offload data processing)? Are there any specific sandbox restrictions or entitlement requirements for this type of XPC communication? Thank you in advance!

App & System Services Core OS Network Extension XPC App Sandbox

230

Reply to Does app launch recency affect NEPacketTunnelProvider, HotspotHelper, or NEHotspotManager functionality?

Thanks for the post. Very interesting question about that API! What do you mean for staleness check? Once a Network Extension is installed, authorized by the user, and saved to the system preferences via its respective manager, the configuration is owned by the OS. The OS will continue to invoke the extension binaries as needed, regardless of whether the main app has been force-quit or hasn't been launched in months. I’m interested on the behavior you are seeing is almost certainly caused by a secondary factors. Has the user has offload unused apps? I believe when an app is offloaded, its extension binaries are deleted along with the main app. The VPN profile or Hotspot configuration will still appear in iOS Settings, but the OS will silently fail to invoke the NEHotspotHelper or fail to connect the NEPacketTunnelProvider because the executable no longer exists. You have mentioned 90 days? If this app is being distributed to internal testers or beta users via TestFlight, the app and its exte

App & System Services Networking

Mar ’26

Reply to Unable to load a quantized Qwen 1.7B model on an iPhone SE 3

Running large models like Qwen3 1.7B on devices with limited resources, such as the iPhone SE 3 with 4 GB of RAM, is indeed challenging. Let's address your questions and explore potential approaches to mitigate the issues you're facing: Observations and Possible Causes Memory Spike During Load: Dynamic Shape Usage: While dynamic shapes can help manage memory allocation during inference by not preallocating for the full context length, the initial loading process often requires more fixed memory to parse the model, set up internal structures, and potentially convert certain operations to formats supported by the hardware. Intermediate Conversion: Core ML might internally convert some operations from INT4 to INT8 or FP16 if the underlying hardware (BNNS/ANE) doesn't natively support INT4 operations. This can cause temporary spikes in memory usage during loading. Memory Limitations: The iPhone SE 3's 4 GB RAM is quite limited for large models, especially if additional overhead from the operating system and other

Machine Learning & AI Core ML

Feb ’26

Reply to Proposal: Using ARKit Body Tracking & LiDAR for Sign Language Education (Real-time Feedback)

Update: Refining the Architecture with LLMs (Gloss-to-Text) I've been refining the concept to make development faster and less data-dependent. Instead of trying to solve Continuous Sign Language Recognition purely through computer vision (which is extremely hard), we can split the workload. The Hybrid Pipeline Proposal: Vision Layer (ARKit): Focus strictly on Isolated Sign Recognition. The CoreML model only needs to identify individual signs (Glosses) based on the skeleton data. It treats gestures as Tokens. Input: Skeleton movement. Output: Raw tokens like [I], [WANT], [WATER], [PLEASE]. Logic Layer (LLM): We feed these raw tokens into an On-Device LLM (or API). Since LLMs excel at context and syntax, the model reconstructs the sentence based on the tokens. Input: [I] [WANT] [WATER] [PLEASE] Output: I would like some water, please. Why this is faster to build: We don't need a dataset of millions of complex sentences to train the Vision Model. We only need a dictionary of isolated signs. The grammar part is offloaded

Accessibility & Inclusion General

Dec ’25

Reply to Are read-only filesystems currently supported by FSKit?

Volume does not implement both maxFileSizeInBits and maxFileSize, while one of them must be implemented. Implementing this didn't seem to change the result. But I definitely do need to fix the sample FSKit project I've been copying as a base for all of these bug reports, then! Have you looked at what the actual block size of that device is and what FSBlockDeviceResource.blockSize is? Both physicalBlockSize and FSBlockDeviceResource.blockSize are 512 on the disk image. However, there are other issues. Your testing with a disk image, but the disk image block size is 0x200/512, NOT 0x1000/4096. If you’re looking at those values from the volume side, you may get 4096, but that's because the volume changed what stat returned, not because it's actually true. ... In your particular case, this also means that the stat value you're returning is 4x larger than the underlying FSResource size. That isn't necessarily wrong, but that's because the VFS layer will basically believe anything you tell it, not because that's wh

App & System Services Core OS

Nov ’25

Reply to Are read-only filesystems currently supported by FSKit?

I've also been seeing some other issues related to certain things I set in the FSKit API not showing up in statfs (mainly the volumeStatistics's blockSize and ioSize, FB21106711). Actually, I think the size problem might be on your side. So, first off, your test implementation is incomplete. This is the last message logged by your extension: 2025-11-20 12:56:06.891883-0800 FSKitSampleFilesystem: (FSKit) [com.apple.FSKit:default] -[FSModuleVolume(Project) getMaxFileSizeInBits]: Volume does not implement both maxFileSizeInBits and maxFileSize, while one of them must be implemented. Shortly after which, lifs (the kernel support KEXT for FSKit) logs: 2025-11-20 12:56:06.891917-0800 kernel: (lifs) lmp max_filesize 0x7fffffffffffffff 2025-11-20 12:56:06.891927-0800 kernel: (lifs) lifs_io_strategy_thread: thread starting for mount 2025-11-20 12:56:06.891936-0800 kernel: (lifs) Failed to open block device /dev/disk7, err: 16 2025-11-20 12:56:06.891937-0800 kernel: (lifs) unknown: isssd 0 devblksize 512 devreadsize

App & System Services Core OS

Nov ’25

How to track offloaded apps (Offload Unused Apps) and push behavior?

Hi, I have a couple of questions regarding the “Offload Unused Apps” feature in iOS: 1. Is there a way to track how many users have offloaded our app? • We’re looking to understand whether Apple provides any visibility — via App Store Connect, analytics, or any API — into how often the app has been offloaded on user devices. • Specifically, we’d like to know if there’s any way to count devices that have our app offloaded (app binary removed but data retained). 2. Will push notifications still work if the app is offloaded? • Does iOS still deliver push notifications to the device if the app is offloaded? • If a user taps a notification for an offloaded app, will the app reinstall and open automatically? If there are any recommended best practices for handling offloaded app states or detecting reinstalls via push or analytics, that would be helpful too. Thanks in advance!

App Store Distribution & Marketing General

Nov ’25

Reply to Best Practices for Binary Data (“Allows External Storage”) in Core Data with CloudKit Sync

Thanks so much, @tbartelmess1—this is super helpful, and really appreciated a bit more context from our app: App context (what we store) The blobs we persist will be user-generated cruise photos, we would downsize those to more manageable size as iphone format photos can be quite big, but they would still be in the 1-3 mb after downsizing Realistic volume per active user: a few hundred images/year; heavy users could reach low thousands over time. Decision: use Core Data Binary Data + “Allows External Storage” We’ll keep originals as Binary Data (Allows External Storage) so Core Data handles externalization transparently, my philosophy has always been to offload as much work to the system services as possible. We’ll keep thumbnails as well inline in coredata (let coredata decide but likely will be inline (blob)). CloudKit mirroring We’ll rely on NSPersistentCloudKitContainer mirroring; we understand CloudKit decides when an attribute becomes a CKAsset independently of Core Data’s externalization thres

App & System Services iCloud & Data

Oct ’25

Why are system reserved files consuming half of my storage?

I am constantly running out of storage on my iPhone 16 Pro. I keep having to move my photos and videos to my laptop and delete them from my phone, and I’m constantly needing to offload apps and manually clear caches in some apps to free up storage. I finally got sick of having this cycle every two weeks so looked into it more closely. I’m finding that iOS consumes 32 GB, and then another system reserve category is consuming an additional 23 GB. Meaning the system reserved files are consuming half of the storage on this phone and effectively making it a 64 GB model. I understand the system will need to consume some capacity for itself and that iOS is getting larger, but nearly 50% of the capacity of the phone is insane. Looking closer into the categories, I’m seeing that iOS has taken it upon itself to also permanently provision 10% of the storage capacity for reserve update space. Already another instance of “why am I having to lose so much of my functional capacity to an occasional process?” but I c

Community Apple Developers Files and Storage iOS iPhone

358

Oct ’25

Float64 (Double Precision) Support on MPS with PyTorch on Apple Silicon?

Hi everyone, This project uses PyTorch on an Apple Silicon Mac (M1/M2/etc.), and the goal is to use the MPS backend for GPU acceleration, notes Apple Developer. However, the workflow depends on Float64 (double-precision) floating-point numbers for certain computations, notes PyTorch Forums. The error Cannot convert a MPS Tensor to float64 dtype as the MPS framework doesn't support float64. Please use float32 instead has been encountered, notes GitHub. It seems that the MPS backend doesn't currently support Float64 for direct GPU computation. Questions for the community: Are there any known workarounds or best practices for handling Float64-dependent operations when using the MPS backend with PyTorch? For those working with high-precision tasks on Apple Silicon, what strategies are being used to balance performance with the need for Float64? Offloading to the CPU is an option, and it's of interest to know if there are any specific techniques or libraries within the Apple ecosystem that could streamlin

Graphics & Games Metal

496

Aug ’25

Reply to iOS 18 new RecognizedTextRequest DEADLOCKS if more than 2 are run in parallel

You're welcome. We're here to help. Seems like you're flying with insight w.r.t. limitations of ANE on iPhone. Challenge question: are you certain image resizing is too resource intensive, particularly if offloaded to GPU?

Machine Learning & AI General

Jul ’25

Reply to How do I use FSBlockDeviceResource's metadataRead method?

Oh, interesting. This actually came up when I filed a different bug where kernel offloaded IO wasn't working (FB17773100). At first, it was closed because I didn't include that key (since it wasn't documented or in the template), but it still didn't work after adding that key until macOS 15.6 beta 3, where it's now fixed. Adding some background context, the reason the key exists is that because kernel memory is involved, we wanted to make sure it would only occur in clients that explicitly asked for it. The metadata I/O APIs also involve kernel memory, which is why it ended up being limited by the same plist key. For anyone else who finds this thread, FB18614667 is fixed in macOS 15.6 RC (24G84). Yep. It's always tricky to talk about future stuff, but it's often the case that the bug fix is already on its way to shipping when I'm writing about them. __ Kevin Elliott DTS Engineer, CoreOS/Hardware

App & System Services Core OS

Jul ’25

Reply to How do I use FSBlockDeviceResource's metadataRead method?

FSSupportsKernelOffloadedIO Oh, interesting. This actually came up when I filed a different bug where kernel offloaded IO wasn't working (FB17773100). At first it was closed because I didn't include that key (since it wasn't documented or in the template), but it still didn't work after adding that key until macOS 15.6 beta 3, where it's now fixed. Interesting to see that metadata{Read,Write} is linked to that at the moment. It was indeed the case that adding that key made it work. the FSKit team is working very hard to ship as many fixes as possible in macOS 15 (not just macOS 26) Yeah, I have noticed that the FSKit team has generally been quite responsive and good at updating the statuses of feedbacks I've filed recently. Highly appreciated, by the way! No, or at least not exactly... Interesting insight! I mostly come from a background (or lack thereof) where I kinda just started working with filesystem code first with FUSE as a small thing (for a school project) and found it interesting, then FSKi

App & System Services Core OS

Jul ’25

Reply to How do I use FSBlockDeviceResource's metadataRead method?

So, let me get the bug out of the way first: I reported this as a bug (FB18614667), but also wanted to ask here in case this is actually just me doing There are actually two bugs here: FSSupportsKernelOffloadedIO is the Info.pist key that marks whether or not to use FSVolumeKernelOffloadedIOOperations to shift file I/O into the kernel. We haven't actually documented that key, but there's actually a more general bug on that (r.156162068), which is to consolidate and document all the FSKit's Info.plist keys. That Info.plist key is currently restricting the metadataRead/Write APIs, which it really shouldn't (r.155070316). That is, you should be able to use metadataRead/Write, even if you don't offload I/O. I can't comment on our release schedule, but the fix is straightforward and the FSKit team is working very hard to ship as many fixes as possible in macOS 15 (not just macOS 26). In terms of what you do now: Once #2 is fixed, I believe your code will “just work”. I think it's perfectly reasonable to a

App & System Services Core OS

Jul ’25