Umpire
rr
Umpire | rr | |
---|---|---|
4 | 102 | |
7 | 8,684 | |
- | 1.3% | |
8.3 | 9.6 | |
about 1 year ago | 5 days ago | |
Rust | C++ | |
GNU General Public License v3.0 only | GNU General Public License v3.0 or later |
Stars - the number of stars that a project has on GitHub. Growth - month over month growth in stars.
Activity is a relative number indicating how actively a project is being developed. Recent commits have higher weight than older ones.
For example, an activity of 9.0 indicates that a project is amongst the top 10% of the most actively developed projects that we are tracking.
Umpire
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3 years of fulltime Rust game development, and why we're leaving Rust behind
* https://github.com/joshhansen/Umpire
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Hey Rustaceans! Got a question? Ask here (13/2023)!
The reason for this is that I'd like to use an RAII pattern to control player turns in Umpire. When the struct is initialized, it starts the player's turn, and when the struct is dropped, it ends the player's turn.
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What's everyone working on this week (5/2023)?
Wound up with some time so I figured I'd port my Umpire military strategy game to a client-server architecture so people can play it online. This will give me some experience with Tokio, tarpc, and async Rust generally, since I'm eyeing a possible Rust dev gig in my future.
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Am I the only one who finds Rust to be centered around Linux? Any Windows devs want to share their experience with Rust?
I've done a little bit of Rust development on Windows and had a good experience. I ported my (still unfinished) Umpire game to Windows pretty easily. I had to rename some files that had colons in the filename which Windows didn't like. The actual hard part was the terminal library, but switching to crossterm was pretty straightforward. All in all it was pretty painless.
rr
- rr: Lightweight Recording and Deterministic Debugging
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Hermit is a hermetic and reproducible sandbox for running programs
I think this tool must share a lot techniques and use cases with rr. I wonder how it compares in various aspects.
https://rr-project.org/
rr "sells" as a "reversible debugger", but it obviously needs the determinism for its record and replay to work, and AFAIK it employs similar techniques regarding system call interception and serializing on a single CPU. The reversible debugger aspect is built on periodic snapshotting on top of it and replaying from those snapshots, AFAIK. They package it in a gdb compatible interface.
Hermit also lists record/replay as a motivation, although it doesn't list reversible debugging in general.
- Rr: Lightweight Recording and Deterministic Debugging
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Deep Bug
Interesting. Perhaps you can inspect the disassembly of the function in question when using Graal and HotSpot. It is likely related to that.
Another debugging technique we use for heisenbugs is to see if `rr` [1] can reproduce it. If it can then that's great as it allows you to go back in time to debug what may have caused the bug. But `rr` is often not great for concurrency bugs since it emulates a single-core machine. Though debugging a VM is generally a nightmare. What we desperately need is a debugger that can debug both the VM and the language running on top of it. Usually it's one or the other.
> In general I’d argue you haven’t fixed a bug unless you understand why it happened and why your fix worked, which makes this frustrating, since every indication is that the bug exists within proprietary code that is out of my reach.
Were you using Oracle GraalVM? GraalVM community edition is open source, so maybe it's worth checking if it is reproducible in that.
[1]: https://github.com/rr-debugger/rr
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So you think you want to write a deterministic hypervisor?
https://rr-project.org/ had the same problem. They use the retired conditional branch counter instead of instruction counter, and then instruction steeping until at the correct address.
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Is Something Bugging You?
That'll work great for your Distributed QSort Incorporated startup, where the only product is a sorting algorithm.
Formal software verification is very useful. But what can be usefully formalized is rather limited, and what can be formalized correctly in practice is even more limited. That means you need to restrict your scope to something sane and useful. As a result, in the real world running thousands of tests is practically useful. (Well, it depends on what those tests are; it's easy to write 1000s of tests that either test the same thing, or only test the things that will pass and not the things that would fail.) They are especially useful if running in a mode where the unexpected happens often, as it sounds like this system can do. (It's reminiscent of rr's chaos mode -- https://rr-project.org/ linking to https://robert.ocallahan.org/2016/02/introducing-rr-chaos-mo... )
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When "letting it crash" is not enough
The approach of check-pointing computation such that it is resumable and restartable sounds similar to a time-traveling debugger, like rr or WinDbg:
https://rr-project.org/
https://learn.microsoft.com/windows-hardware/drivers/debugge...
- When I got started I debugged using printf() today I debug with print()
- Rr: Record and Replay Debugger – Reverse Debugger
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OpenBSD KDE Plasma Desktop
https://github.com/rr-debugger/rr?tab=readme-ov-file#system-...
What are some alternatives?
ntfs - An implementation of the NTFS filesystem in a Rust crate, usable from firmware level up to user-mode.
CodeLLDB - A native debugger extension for VSCode based on LLDB
lxd-snapper - LXD snapshots, automated
rrweb - record and replay the web
mini-me - Inline multiline text-editor/prompt written in Rust.
gef - GEF (GDB Enhanced Features) - a modern experience for GDB with advanced debugging capabilities for exploit devs & reverse engineers on Linux
xwin - A utility for downloading and packaging the Microsoft CRT headers and libraries, and Windows SDK headers and libraries needed for compiling and linking programs targeting Windows.
Module Linker - browse modules by clicking directly on "import" statements on GitHub
tui-realm - 👑 tui-rs framework to build stateful applications with a React/Elm inspired approach
nbdev - Create delightful software with Jupyter Notebooks
wasm-bindgen-serde-example
clog-cli - Generate beautiful changelogs from your Git commit history