Folly
react-native-debugger
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Folly | react-native-debugger | |
---|---|---|
90 | 20 | |
27,072 | 10,269 | |
1.0% | - | |
9.8 | 7.7 | |
3 days ago | 6 months ago | |
C++ | JavaScript | |
Apache License 2.0 | MIT License |
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.
Folly
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Ask HN: How bad is the xz hack?
https://github.com/facebook/folly/commit/b1391e1c57be71c1e2a...
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Backdoor in upstream xz/liblzma leading to SSH server compromise
https://github.com/facebook/folly/pull/2153
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A lock-free ring-buffer with contiguous reservations (2019)
To set a HP on Linux, Folly just does a relaxed load of the src pointer, release store of the HP, compiler-only barrier, and acquire load. (This prevents the compiler from reordering the 2nd load before the store, right? But to my understanding does not prevent a hypothetical CPU reordering of the 2nd load before the store, which seems potentially problematic!)
Then on the GC/reclaim side of things, after protected object pointers are stored, it does a more expensive barrier[0] before acquire-loading the HPs.
I'll admit, I am not confident I understand why this works. I mean, even on x86, loads can be reordered before earlier program-order stores. So it seems like the 2nd check on the protection side could be ineffective. (The non-Linux portable version just uses an atomic_thread_fence SeqCst on both sides, which seems more obviously correct.) And if they don't need the 2nd load on Linux, I'm unclear on why they do it.
[0]: https://github.com/facebook/folly/blob/main/folly/synchroniz...
(This uses either mprotect to force a TLB flush in process-relevant CPUs, or the newer Linux membarrier syscall if available.)
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Appending to an std:string character-by-character: how does the capacity grow?
folly provides functions to resize std::string & std::vector without initialization [0].
[0] https://github.com/facebook/folly/blob/3c8829785e3ce86cb821c...
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Can anyone explain feedback of a HFT firm regarding implementation of SPSC lock-free ring-buffer queue?
My implementation was quite similar to Boost's spsc_queue and Facebook's folly/ProducerConsumerQueue.h.
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A Compressed Indexable Bitset
> How is that relevant?
Roaring bitmaps and similar data structures get their speed from decoding together consecutive groups of elements, so if you do sequential decoding or decode a large fraction of the list you get excellent performance.
EF instead excels at random skipping, so if you visit a small fraction of the list you generally get better performance. This is why it works so well for inverted indexes, as generally the queries are very selective (otherwise why do you need an index?) and if you have good intersection algorithms you can skip a large fraction of documents.
I didn't follow the rest of your comment, select is what EF is good at, every other data structure needs a lot more scanning once you land on the right chunk. With BMI2 you can also use the PDEP instruction to accelerate the final select on a 64-bit block: https://github.com/facebook/folly/blob/main/folly/experiment...
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Defer for Shell
C++ with folly's SCOPE_EXIT {} construct:
https://github.com/facebook/folly/blob/main/folly/ScopeGuard...
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Is there any facebook/folly community for discussion and Q&A?
Seems like github issues taking a long time to get any response: https://github.com/facebook/folly
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How a Single Line of Code Made a 24-Core Server Slower Than a Laptop
Can't speak for abseil and tbb, but in folly there are a few solutions for the common problem of sharing state between a writer that updates it very infrequently and concurrent readers that read it very frequently (typical use case is configs).
The most performant solutions are RCU (https://github.com/facebook/folly/blob/main/folly/synchroniz...) and hazard pointers (https://github.com/facebook/folly/blob/main/folly/synchroniz...), but they're not quite as easy to use as a shared_ptr [1].
Then there is simil-shared_ptr implemented with thread-local counters (https://github.com/facebook/folly/blob/main/folly/experiment...).
If you absolutely need a std::shared_ptr (which can be the case if you're working with pre-existing interfaces) there is CoreCachedSharedPtr (https://github.com/facebook/folly/blob/main/folly/concurrenc...), which uses an aliasing trick to transparently maintain per-core reference counts, and scales linearly, but it works only when acquiring the shared_ptr, any subsequent copies of that would still cause contention if passed around in threads.
[1] Google has a proposal to make a smart pointer based on RCU/hazptr, but I'm not a fan of it because generally RCU/hazptr guards need to be released in the same thread that acquired them, and hiding them in a freely movable object looks like a recipe for disaster to me, especially if paired with coroutines https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2020/p05...
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Ask HN: What are some of the most elegant codebases in your favorite language?
Not sure if it's still the case but about 6 years ago Facebook's folly C++ library was something I'd point to for my junior engineers to get a sense of "good" C++ https://github.com/facebook/folly
react-native-debugger
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Is it possible to get the network tab while being on the hermes debugger? I know you can use network plugin, but I kinda like the way that it looks chrome style.
I used to use this which has what I'm talking about, but I've had issues running it with hermes.
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Alternatives to Flipper for debug Redux Toolkit?
https://github.com/jhen0409/react-native-debugger, It is a great tool to debug redux , it comes with the default debugger like we use in web to debug redux.
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Tools for Debugging in React-Native
react-native-debugger
- Debugging
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Open the React Native debugger on Android without shaking.
Alternatively, instead of using the adb tool, you can also use the React Native Debugger app (https://github.com/jhen0409/react-native-debugger) to open the debugger on your device. This app provides a button that you can press to open the debugger, so you don't have to use the adb tool or shake the phone.
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Can't connect to React Devtools using Expo and Android Phone
I use React Native Debugger, it is all-in-ome debugger (https://github.com/jhen0409/react-native-debugger).
- Debugging RN + Expo bare using WebStorm? Would I be better off just killing myself now?
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Is RN even worth it?
React Native is a great tool for certain jobs. Depending on what you're trying to build, Swift may or may not be a better fit. As for debugging, React Native Debugger can be your best friend. https://github.com/jhen0409/react-native-debugger
- Does Hermes debugging have a performance problem?
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What I Learned as a Web Dev on My First React Native Project
There are many ways to debug your app by reaching for tools like React Dev Tools, a simple element inspector or a network tab that you're used to. Tools such as React Native Debugger are also quite popular, but they require turning on the 'Remote debugging' mode on your simulator, which I found sometimes interferes with the app and throws weird errors.
What are some alternatives?
abseil-cpp - Abseil Common Libraries (C++)
hermes - A JavaScript engine optimized for running React Native.
Boost - Super-project for modularized Boost
react-native-mmkv - ⚡️ The fastest key/value storage for React Native. ~30x faster than AsyncStorage!
Seastar - High performance server-side application framework
react-native-reanimated - React Native's Animated library reimplemented
parallel-hashmap - A family of header-only, very fast and memory-friendly hashmap and btree containers.
flipper - A desktop debugging platform for mobile developers.
EASTL - Obsolete repo, please go to: https://github.com/electronicarts/EASTL
reactotron - A desktop app for inspecting your React JS and React Native projects. macOS, Linux, and Windows.
OpenFrameworks - openFrameworks is a community-developed cross platform toolkit for creative coding in C++.
async-storage - An asynchronous, persistent, key-value storage system for React Native.