flipper
Folly
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flipper | Folly | |
---|---|---|
29 | 90 | |
13,211 | 27,034 | |
0.5% | 0.8% | |
9.9 | 9.8 | |
7 days ago | 7 days ago | |
TypeScript | C++ | |
MIT License | Apache License 2.0 |
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.
flipper
- Way or viewing network requests?
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Can anyone explain how to debug with Android Studio?
Definitely switch to VS Code! I personally don't use the built in VS Code debugger, but check out Flipper as another option. It's got a lot of great tools and plugins for debugging. The Layout Inspector will be what you are looking for if you want to inspect the styling specifically.
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what tools do you use to inspect your UI in react native? the built-in devtools are not very helpful as far as inspecting what is styling the components
I use Flipper with its Layout Inspector plugin
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What flipper version works ?
Also no folder show on sources filesystem (in Hermes Debugger) as described here: https://github.com/facebook/flipper/issues/4530
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Tools for Debugging in React-Native
Very useful and beautiful and simply , my suggestion is to use this Flipper
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Logcat is awful. What would you improve?
You may also want to look into custom Flipper plugins to instrument your app.
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React vs React Native: How Different Are They, Really?
Some development tools for the web are similar (Chrome debugger, mostly) to those for React Native, but other aspects are very different (working with the metro bundler, using Flipper, AsyncStorage debugging, more). Some techniques developers will use are the same (breakpoints and console logging), but others are different (knowing when to restart the packager vs reinstall the app on device).
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Are you ugly on purpose? (I was scrolling through Facebook and found this ad)
from the GitHub, and has existed under the name flipper since mid 2018
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How to specify pre-processor flags to the JSI-based React Native libraries
It's not possible to use a browser to debug a JSI app, use Flipper (for android Flipper also has SQLite Database explorer).
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Why does apk built with EAS crashes on launch after installation?
Try to debug it with adb logcat or Android Studio or Flipper you'll find the error why is crashing :)
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
What are some alternatives?
reactotron - A desktop app for inspecting your React JS and React Native projects. macOS, Linux, and Windows.
abseil-cpp - Abseil Common Libraries (C++)
chucker - 🔎 An HTTP inspector for Android & OkHTTP (like Charles but on device)
Boost - Super-project for modularized Boost
react-native-debugger - The standalone app based on official debugger of React Native, and includes React Inspector / Redux DevTools
Seastar - High performance server-side application framework
Proxyman - Modern. Native. Delightful Web Debugging Proxy for macOS, iOS, and Android ⚡️
parallel-hashmap - A family of header-only, very fast and memory-friendly hashmap and btree containers.
react-native-mmkv - ⚡️ The fastest key/value storage for React Native. ~30x faster than AsyncStorage!
EASTL - Obsolete repo, please go to: https://github.com/electronicarts/EASTL
lvgl - Embedded graphics library to create beautiful UIs for any MCU, MPU and display type.
OpenFrameworks - openFrameworks is a community-developed cross platform toolkit for creative coding in C++.