ctrie-java
AspNetCoreDiagnosticScenarios
ctrie-java | AspNetCoreDiagnosticScenarios | |
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1 | 53 | |
1 | 7,454 | |
- | - | |
10.0 | 6.0 | |
almost 4 years ago | about 1 month ago | |
Java | C# | |
Apache License 2.0 | - |
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ctrie-java
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Ask HN: What are some 'cool' but obscure data structures you know about?
Concurrent tries with non-blocking snapshots [0]
Say that you have a dataset that needs to be ordered, easily searchable, but is also updated quite frequently. Fast accesses are a pain if you decide to use traditional read-write locks.
Ctries are entirely lock-free, thus there is no waiting for your read operations when an update is happening, i.e. you run lookups on snapshots while updates happen.
They are also a lot of fun to implement, especially if you aren't familiar with lock-free algorithms! I did learn a lot doing it myself [1]
[0] http://aleksandar-prokopec.com/resources/docs/ctries-snapsho...
[1] https://github.com/mabeledo/ctrie-java
AspNetCoreDiagnosticScenarios
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Asynchronous Programming in C#
Important: following #prefer-asyncawait-over-directly-returning-task from https://github.com/davidfowl/AspNetCoreDiagnosticScenarios/b... is not correct.
The concerns raised are niche and edge case and task must always be forwarded as is provided there is no post-processing or resource cleanup with idisposable.
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Give me your async/await gotchas
This one is a pretty decent guide - https://github.com/davidfowl/AspNetCoreDiagnosticScenarios/blob/master/AsyncGuidance.md
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What's the Benefit/Allure of Async/Await vs. CSP/Green Threads (and Other Concurrency Models)?
The C# (mostly applicat community has e.g. https://github.com/davidfowl/AspNetCoreDiagnosticScenarios/blob/master/AsyncGuidance.md written by one of the Asp.Net architects. I found this in this lovely thread https://news.ycombinator.com/item?id=36785691 which expresses my views/confusion more clearly than I can express.
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The State of Async Rust
No it doesn't, hence why there are best practices guidelines written by the .NET architects, and there was a research project to add Go/Java co-routines as well.
https://github.com/davidfowl/AspNetCoreDiagnosticScenarios/b...
https://twitter.com/davidfowl/status/1532880744732758018?lan...
https://github.com/dotnet/runtimelab/issues/2057
https://github.com/dotnet/runtimelab/issues/2398
- Java 21 makes me like Java again
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The Downsides of C++ Coroutines
They don't work just fine in C#, there is a reason why one of ASP.NET architects has written a guide of best practices.
https://github.com/davidfowl/AspNetCoreDiagnosticScenarios/b...
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No-GIL mode coming for Python
Many that praise async/await in C#, kind of forget it took about 10 years to spread across all the layer of the language and runtime, since it was done via IL rewriting, it caused several issues with F# async tasks, due to the age of the ecosystem plenty of code isn't async/await friendly and needs to be wrapped into Task.Run() or similar.
There is a best practices guideline from one of the ASP.NET architects, https://github.com/davidfowl/AspNetCoreDiagnosticScenarios/b...
During last year they researched adding Go/Java's approach to .NET, but now it is too late. See the ASP.NET Q&A session at BUILD 2023.
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Task vs threads - use cases
The best guidance I have found was from here: AsyncGuidance.md
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How Much Memory Do You Need to Run 1M Concurrent Tasks?
To expand upon this thought, here is the AsyncGuidance doc[1] on why not to use .Result to get the return value of a completed Task in C#.
To make this simple they introduced async Main[2] a few years ago.
[1]: https://github.com/davidfowl/AspNetCoreDiagnosticScenarios/b...
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React developer to NET
Async Guidance
What are some alternatives?
PSI - Private Set Intersection Cardinality protocol based on ECDH and Bloom Filters
minisketch - Minisketch: an optimized library for BCH-based set reconciliation
t-digest - A new data structure for accurate on-line accumulation of rank-based statistics such as quantiles and trimmed means
sdsl-lite - Succinct Data Structure Library 2.0
WPF - WPF is a .NET Core UI framework for building Windows desktop applications.
CPython - The Python programming language
hamt - A hash array-mapped trie implementation in C
Folly - An open-source C++ library developed and used at Facebook.
Hot Chocolate - Welcome to the home of the Hot Chocolate GraphQL server for .NET, the Strawberry Shake GraphQL client for .NET and Banana Cake Pop the awesome Monaco based GraphQL IDE.
RoaringBitmap - A better compressed bitset in Java: used by Apache Spark, Netflix Atlas, Apache Pinot, Tablesaw, and many others
eShopOnWeb - Sample ASP.NET Core 8.0 reference application, powered by Microsoft, demonstrating a layered application architecture with monolithic deployment model. Download the eBook PDF from docs folder.