Rust client memory leak. An example would be a server… Rc and RefCell in Rust can cause memory leaks and runtime panics if misused. For my computer my memory consumption is around 11GB when the heli event is going on which ends up causes freezes and eventual crashes. How to investigate a potential Rust memory leak? I've built a simple Rust rest api using axum that interfaces with with a C++ library via bindings that I've also written in Rust. Use judiciously for complex structures. In case this helps, this is my app: GitHub - idewave/idewave-cli at dev. unless you're doing FFI or unsafe rust? The new host may have enabled rust features that the old host did not, i. I&#39;d like to write an async function that periodically update the state with the latest values from data store. I just see in task manager how RAM grows when app is running. I've been very careful while writing it and consulted the bind-gen channel on the Rust discord for advice and assistance. However where we must be careful with destructor leaks are proxy types. If you fix the "definitely lost" leaks, the "indirectly lost" leaks should go away. rs. BUT WAIT! I hear you say — doesn’t Rust’s borrow checker prevent memory errors? Isn’t Rust supposed to be “safe?” It turns out that, according to Rust’s rules, leaking memory is completely safe! In fact, we can purposely leak as much memory as we want using the function std::mem::forget. Open the project in Visual Studio Code. Learn how to plug the leaks with simple, effective fixes for ownership, cycles, and async gone wrong. 5 gb out of 15. I use the sample program provided by Microsoft team (here). The other problem is when the heli is not out flying around my Rust memory consumption is still 6GB. Apr 6, 2019 · Yes, leaking memory in Rust is as easy as calling the std::mem::forget function. i have to open and close the game to fix it and its kinda getting annoying and repetitive, anyone know a fix or is it just the game? Rust Ownership is a concept that prevents variables from being lost in runtime, ultimately preventing memory leaks. The Unlikely Culprit: A Rust Memory Leak Imagine a Rust application deployed to Google Cloud Run. When running my program, I'm seeing high memory usage. You can also leak memory if you create a cycle of shared references: A cycle between Rc pointers will never be deallocated. When the game crashes, my memory is only at around 9. "possibly lost" means your program is leaking memory, unless you're doing unusual things with pointers that could cause them to point into the middle of an allocated block; see the user manual for some possible causes. I also tried Sublime Text 3 with LSP and Rust Enhanced extension, it does not eat up all memory, but it still crashes. 8 GB resident memory: 11. By assigning ownership and allowing for the borrowing of variable access, Rmore The similarity of the phrases "memory leak" and "memory safety" regularly tricks people who have read "Rust is memory safe" into thinking Rust is (just) preventing memory leaks, leading to legitimate doubts about what Rust offers instead of, say, modern C++ in the space of low-level systems languages. Rust Memory Leak? why is rust using 80-90% of my physical memory and having stutter lag on ultra and low settings. So, not an option for production web how do i fix a memory leak, rust was working fine up until last update and now it uses 100% of disk usage while playing no matter the graphics According to the reference, “Leaks due to reference count cycles, even in the global heap” is not unsafe. Why is it lower? After running a task (it's a server which uses smol as a multithreaded executor), System Monitor shows Even after your program frees everything, the allocator won't release that memory back to the OS because it might need that memory again and asking the OS for more memory is expensive. It has been running smoothly for Leak detectors have existed as long as we’ve had leaks. I've been experiencing this issue since the vending machine addition to the game patch. Memory leaks URHHH. Now within minutes of being on… Learn how Rust’s drop checker works by building a practical memory leak detection tool that you can integrate into your own projects. You have junk reserving memory that isn't rust Rust is only using half your memory normally rebooting releases memory commits, of its a background service that is the problem You can try to run your app in the constrained environment (there are ways to limit memory per app), or you can call malloc_trim after you drop the map to force release the memory to the OS (warning, only use it to verify if this is indeed the cause, I wouldn't suggest to use this in the production). Without these parameters can't play more than 15 min. Rust's design, however, makes it less easy to create memory leaks, since it uses a Resource Acquisition Is Initialization (RAII) pattern to abstract resource allocation and deallocation. Let’s explore both with working code examples you can run yourself. Not doing anything out of the ordinary when it happened. CUI usage leads to memory leak on client Deleted User #3587 Posted 6 years ago Last updated 5 years ago Hi, i have over 600 hours in rust and every second ran super smooth without an issue and over the last few days my game has been crashing constantly due to high memory. me/donateThanks to Omer from Egypt for submitting this quest I wrote a Rust program using windows-sys crate and collecting the performance counter values for query that is being supplied. renderers "False" It will fix memory leak. 00 GHz 8 GB RAM 64-bit OS, x64-based processor It turns out that, according to Rust’s rules, leaking memory is completely safe! In fact, we can purposely leak as much memory as we want using the function std::mem::forget. Wait for a minute or two. Mar 27, 2017 · Hello, I've found a fix that actually works for when rust uses up all the ram. Standing in a 4x4 base with some people outside trying to get in. I dont know if its only me but after an hour or so on the game its using all 12gb of my ram and starts to run like utter ♥♥♥♥. Hello, I&#39;m confusing to dealing with memory leak in rust. More complex and verbose code. With RefCell, be cautious about borrowing patterns to avoid panics. I even had a buddy with 6GB of RAM who wasn't having any issues at all with his graphics set to med/high. 5(windows 10 average) to full 16 gb usage. The remarkable Valgrind tool suite comes with MemCheck, which has a --leak-check option. I have a Rust program that is intermittently leaking enough memory to trigger the Linux oom-killer. I think its a memory leak but i havent been able to fix it, any help would be greatly appreciated, Thanks! I have a pretty bad problem with rust. Compare server launch configurations, processor affinity, and finally the types of hardware in both machines (not just maximum capacity). Despite their potential for destruction, Rust considers memory leaks "memory safe" and thus doesn't aim to prevent them. It makes the Rust language suitable for writing programs in any domain, be it system, server-side, or client-side applications. Here we offer some key insights and recommendations for reference. You should see that if rust-analyzer crashing and eating up memory. - memory leak warning; with launch options - playing several hours, no problems, firefox in background, skype, discord, bandicam, and Conclusion: Rust is a memory pig that doesn't manage and handle resources very well at all and the only ones who can fix this bloatware of a game is Facepunch Studios. 22 votes, 38 comments. Preventing memory leaks entirely is not one of Rust’s guarantees in the same way that disallowing data races at compile time is, meaning memory leaks are memory safe in Rust. Is there ever a legitimate worry of memory leaks in Rust? I know that memory leaks are possible in a way that memory unsafety is not (in safe Rust). Memory regions For efficient memory usage, memory is organized into regions, each with its own purpose. I've tried googling, but can't find where to even begin to look for how to debug what is causing this memory leak. Now I've found, monitoring my resources that just typing "Free" in the console will bring the game, at least on my system, to about 5. Prior to this patch I had minimal rust lag and stuttering and the memory usage was nowhere near as high. Both of these seem to me like rare events in typical Rust. Final Thoughts: Rust Didn’t Just Fix My Memory Leaks — It Made Me a Better Engineer Learning Rust was like going from duct-taping code together to engineering software with intent. io/@fasterthanlimeSupport my work: https://fasterthanli. But it checks for a lot of errors that simply can’t happen in safe Rust code, and makes your program run 20-30x slower, also using “a lot more memory”. . I understand the game needs on average 10gb to load assets but its maxing out at 16gigs not to mention i ocasionally experience crashes because of this, computer runs out of ram and freezes entirely and crashes. Solved Client seems to leak memory (Rust CUI) Discussion in ' Rust Discussion ' started by rbBiT, Oct 4, 2017. If, for example, Rust in Windows uses the system’s allocator and in Debian it uses jemalloc, you might find different readings when checking memory usage, because jemalloc might choose not to return the memory to the system immediately, and instead keep it for future allocations. I am hearing and have experienced the memory leak which causes Rust to use up your entire systems RAM, leading to a computer freeze and remembered the launch option " -maxMem= " If you right click Rust in your steam library, and click Set Launch Option in the general tab, add -maxMem= [how much ram you want rust to use max]. Some hardware may be better suited to operating rust servers. This approach is uniquely realized in the Rust language. Go to the details tab, right click column headers and add columns for memory commit, then sort memory commit. 1 MB shared memory: 8. However, it seems that the only two examples people bring up of that are intentional leaks using Box::leak and a Rc cycle. Should memory leaks due to other problems (such as a closure that violates a contract being passed by the user) be considered to violate memory safety? I know a lot of people have probably posted about this, but has anyone ever found a fix for the memory usage Rust takes up? When I start the game everything is fine up until when I join a server. The previous solution was to disconnect from the server and reconnect. So when i first started playing rust it would use maybe around 6-7 gbs,that around july 2016. Nov 20, 2024 · Learn how to manage memory leaks in Rust, avoid unsafe behavior, and use tools like Weak references to ensure efficient programs. Could somebody help me to detect where is memory leak ? What are the common practices and approaches ? anyone else having issues with Rust consuming like 90% of your ram? i have 8gbs and sometimes performance will drop big time with 90% ram used and then causes my hard drive to peak at 100% and stay there. Jun 7, 2025 · So you’re hunting down memory leaks in Rust, but it feels like trying to catch a ghost riding a shark, right? Rust’s ownership system usually keeps things tidy, but leaks sneak in with unsafe code or forgotten Rc cycles. Cons: Steep learning curve. I have 16gb of ddr3 ram and a gtx 1070 SC. Put this to Rust launch options in Steam: -nolog -graphics. colliders "False" -batching. Is Rust known for memory leaks, or is my system not very well? Heyo. Rust MEMORY LEAK? For the past couple months, after about 30 minutes of having rust open, the game crashes when it runs out of memory. Applications in Windows, if they cause memory problems (try to modify memory out of their allowed range) that is likely to trigger the application only to crash, or at worst a BSOD (Blue Screen of Death), and then say why. AI. Something I've noticed is that a lot of times "memory leaks" can come from correctly functioning code that just uses a lot of memory, but doesn't release it. i dont loose any fps and it doesnt stutter just once it reaches above 90% it will crash. In Rust, that often means you're not actually Dropping it when you think you are. 9. itemskins "False" -batching. On startup, GNOME System Monitor shows: virtual memory: 1. Been playing this game casually for months now, first time I got this message. Go to file src/visualizer/test. Leveraging jemalloc's heap profiling and tokio-console, combined with diligent code review, we effectively identified and addressed the issue. (caching textures on the HDD i would assume since its out of Ram) it makes the game un playable when that happens. For this reason, Weak is used to break cycles. I thought the memory usage would be at least the size of the binary. However, that doesn’t say anything about other types of memory leaks. Learn how to manage memory leaks in Rust, avoid unsafe behavior, and use tools like weak references to ensure efficient programs. Learn how we solved this issue to eliminate memory leaks in our latest product feature. The progra Wait, how do you have memory leaks? I thought the point of rust was to avoid memory leaks by running static analysis at compile time? . I'm new to Rust. Memory leakage in Rust is completely safeuntil you run out and it results in your program being killed by the kernel. We can see that Rust allows memory leaks by using Rc<T> and RefCell<T>: it’s possible to create references where items refer to each other in a cycle. anyone else? Title says it for what ever reason when i play rust my memory usage goes from 3. Earlier versions of Rust require changing the global allocator from jemalloc to the system's allocator so that Valgrind and friends know how to monitor memory allocations. Got a "Your computer is running low on memory" crash for the first time. Neither of these things are happening. 2 ram usage. does anyone else have that issue and if so do you know a fix for it? Rust starts off using 1GB of RAM or so, gradually making it's way to 8GB+ and slowing FPS, crashing the game, crashing google on the background, and is fixed by restarting your PC, restarting the memoryleak process. After facing some memory leaks in C/C++, I was wondering if there are memory leaks in Rust. 5 MB Question #1: My binary's size is 23 M. What is happening is a hard-fault. Here are my PC's specs: Windows 10 i5-4430 CPU @ 3. For most types this doesn't matter: if you leak the destructor then the type is by definition inaccessible, so it doesn't matter, right? For instance, if you leak a Box<u8> then you waste some memory but that's hardly going to violate memory-safety. That means OS measurements tend to report the maximum amount of memory your program has used at any one time, not the actual amount it is using right now. Checkout commit 1be5539b98fd229f438ce90af7660db1c61fae8d. Ahoy matey! This month, we bring you buildable boats, deep sea, tropical islands, ghost ships, new and improved AI and much, much more! It's a big one. The heli event causes a larger leak for sure. I have been working with opentelemetry-rust crate, during the usage I found that one particular function in this crate has memory leak (using this function is resulting high usage of RSS memory), Memory Consumption Issue… This article records the whole process of diagnosing and fixing a Rust memory leak issue encountered in GreptimeDB. I have 8GB of ram and Rust steadily takes up all of it until I have to close the game, or it crashes. e. This was a fucking month ago when people were crying memory leaks despite the fact that not client had the issue. This blog post serves as a reminder to my past self, who had to identify and resolve a memory leak in a Rust application, and a cautionary tale for my future self, emphasizing the importance of proactive profiling. Oct 15, 2025 · Rust provides two main pathways to leak memory, each revealing different aspects of the language’s design philosophy. I'm getting constant Memory Leaks in Rust. Follow me on Mastodon: https://hachyderm. Use weak references to prevent cycles with Rc. This hands-on guide will transform you from a drop check I5 4670K 8Gb Ram Gtx 1070 Launch options like maxMem or highheapsize help a bit but need to restart every 2 hours at least I have a memory leak in my app. The minimal memory requirements for Rust show in those images that the system requirements Facepunch Studios outlined on the Rust Steam store page are untrue. If it does, can you provide a simple example? Furthermore, how rust handels with memory leaks? I read that Rust handles with 'dangling references' by using the lifetime feature, is there something similar in Rust? mayabe a Garbage collector? Rust has many built-in concepts for memory safety, but it cannot prevent application level logic errors that take up system memory. May 24, 2025 · Rust devs — don’t let your app silently bleed memory. ayfs, cvhxwb, soc0, b85qc, 5drgz, pi0x, lbz0j, c6ed, zab7x, cetfr,