threadx
abseil-cpp
threadx | abseil-cpp | |
---|---|---|
13 | 54 | |
2,431 | 13,955 | |
- | 1.3% | |
0.0 | 9.5 | |
4 months ago | 8 days ago | |
C | C++ | |
GNU General Public License v3.0 or later | 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.
threadx
- Bill Lamie: Story of a man and his real-time operating systems
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Microsoft opens sources ThreadX RTOS used in Raspberry Pis
It is not open source. The source code is open but with an evaluation, i.e. proprietary license:
https://github.com/azure-rtos/threadx/blob/master/LICENSE.tx...
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Eclipse ThreadX
License looked alright, until I came across this: https://github.com/azure-rtos/threadx/blob/a8e5d0946c31385ff...
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PlatformIO and Zephyr is a bad idea
Portability, mainly. Zephyr runs on a wide variety of architectures and 450+ variations of popular boards are already supported upstream (adding more often being pretty easy). In your particular example, your own preferences with regards to building on top of open-source software may play a role too. For example, Azure RTOS is not open source, and its license will, among other things, prevent you to use it in production on other hardware than what's listed herehere. So easily moving from one hardware vendor / SoC to the other might be a problem, should this be a requirement (and it kind of becomes one for a lot of people in these times if silicon shortage)
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Linux vs. QNX/VxWorks for a climate control system - Education
Honestly as long as you use one of the supported MCU families ThreadX is probably a better choice these days given how much better NetX is over FreeRTOS’ TCP implementation.
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As a guess, what percentage of embedded projects actually need the R in RTOS?
Azure RTOS/ThreadX is only free on approved pre-licensed uCs, but with that said, there's a ton of devices covered by it so it's an option for a lot of projects.
- Using FreeRTOS Compatibility Kit with AZURE RTOS on STM32F7
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What are some cool modern libraries you enjoy using?
I'm interested in something equivalent to tx_byte_pool but for non-embedded usage where I want a custom allocator for defined pools. Do you know if mimalloc can do this? I see it has custom heaps, but I didn't see any functions to create one from raw memory.
- FreeRTos with SMP and the Zynq processor
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Thoughts? They look great though!
source is apparently available but no idea what licensing it uses
abseil-cpp
- Sane C++ Libraries
- Open source collection of Google's C++ libraries
- Is Ada safer than Rust?
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Appending to an std:string character-by-character: how does the capacity grow?
Yeah, it's nice! And Abseil does it, IFF you use LLVM libc++.
https://github.com/abseil/abseil-cpp/blob/master/absl/string...
The standard adopted it as resize_and_overwrite. Which I think is a little clunky.
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Shaving 40% Off Google’s B-Tree Implementation with Go Generics
This may be confusing to those familiar with Google's libraries. The baseline is the Go BTree, which I personally never heard of until just now, not the C++ absl::btree_set. The benchmarks aren't directly comparable, but the C++ version also comes with good microbenchmark coverage.
https://github.com/google/btree
https://github.com/abseil/abseil-cpp/blob/master/absl/contai...
- Faster Sorting Beyond DeepMind’s AlphaDev
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“Once” one-time concurrent initialization with an integer
An implementation of call_once that accommodates callbacks that throw: https://github.com/abseil/abseil-cpp/blob/master/absl/base/c...
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[R] AlphaDev discovers faster sorting algorithms
I wouldn't say it's that cryptic. It's just a few bitwise rotations/shifts/xor operations.
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Deepmind Alphadev: Faster sorting algorithms discovered using deep RL
You can see hashing optimizations as well https://www.deepmind.com/blog/alphadev-discovers-faster-sort..., https://github.com/abseil/abseil-cpp/commit/74eee2aff683cc7d...
I was one of the members who reviewed expertly what has been done both in sorting and hashing. Overall it's more about assembly, finding missed compiler optimizations and balancing between correctness and distribution (in hashing in particular).
It was not revolutionary in a sense it hasn't found completely new approaches but converged to something incomprehensible for humans but relatively good for performance which proves the point that optimal programs are very inhuman.
Note that for instructions in sorting, removing them does not always lead to better performance, for example, instructions can run in parallel and the effect can be less profound. Benchmarks can lie and compiler could do something differently when recompiling the sort3 function which was changed. There was some evidence that the effect can come from the other side.
For hashing it was even funnier, very small strings up to 64 bit already used 3 instructions like add some constant -> multiply 64x64 -> xor upper/lower. For bigger ones the question becomes more complicated, that's why 9-16 was a better spot and it simplified from 2 multiplications to just one and a rotation. Distribution on real workloads was good, it almost passed smhasher and we decided it was good enough to try out in prod. We did not rollback as you can see from abseil :)
But even given all that, it was fascinating to watch how this system was searching and was able to find particular programs can be further simplified. Kudos to everyone involved, it's a great incremental change that can bring more results in the future.
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Backward compatible implementations of newer standards constructs?
Check out https://abseil.io. It offers absl::optional, which is a backport of std::optional.