le9-patch
abseil-cpp
le9-patch | abseil-cpp | |
---|---|---|
18 | 54 | |
184 | 14,051 | |
- | 2.0% | |
1.8 | 9.5 | |
12 months ago | 7 days ago | |
Python | C++ | |
Creative Commons Zero v1.0 Universal | Apache License 2.0 |
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le9-patch
- le9-patch prevents system freezes on low-end systems
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zram: swappiness, vfs_cache_pressure, page-cluster, dirty_ratio and dirty_background_ratio settings for gaming machines with HDD and low RAM?
Also, are you using a stock kernel? Try using this patchset https://github.com/hakavlad/le9-patch and more specifically set this
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Does Linux’s memory management suck?
This kernel patch work really well: https://github.com/hakavlad/le9-patch/
- le9 / google mglru patch in pop os kernel
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The case of the programs that were launched with impossible command line options
Oh that’s a known problem. There are many patch sets floating around that fix it by triggering the OOM killer when the system is thrashing: https://github.com/hakavlad/le9-patch
I’ve never ran into this specific problem back when I was daily driving desktop Linux, but I did run into 1000 similar ones that needed bandaid solutions. It’s death of a thousand cuts: https://news.ycombinator.com/item?id=28490753
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Help me out here, why does Windows 10 handle my low memory situation better than Linux (so far)? How do I fix it?
I actually do use the Zen kernel already. If you are already using the zen kernel , make sure to use the latest one which has le9 patches , imho this patch can Improve user experience in tight memory situations. Check this https://github.com/hakavlad/le9-patch, saw many people praise this , but ymmv. Best of luck
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Moving Google Toward the Mainline
- Limit the amount of thrashing or protect some pages from being reclaimed. This has been proposed by Google first and several other people since then, but AFAIK it has never been implemented in the mainline kernel.
Regarding the latter solution, there is a patchset called le9-patch[1] that is included in some alternative Linux kernels and it should be relatively safe to use.
[1]: https://github.com/hakavlad/le9-patch
- Is there a way to make EndeavourOS [XCFE] faster in a laptop with 2GB ram?
- I don't understand RAM resource management on Linux
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nohang: A sophisticated low memory handler for Linux
Patch i was talking about le9-patch. it's only a proof of concept with very rough edges, but consider it isn't written by an experienced kernel developer with deep knowledge of memory subsystem.
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.
What are some alternatives?
nohang - A sophisticated low memory handler for Linux
Folly - An open-source C++ library developed and used at Facebook.
earlyoom - earlyoom - Early OOM Daemon for Linux
Boost - Super-project for modularized Boost
oomd - A userspace out-of-memory killer
spdlog - Fast C++ logging library.
ZenStates-Linux - Dynamically edit AMD Ryzen processor P-States
Qt - Qt Base (Core, Gui, Widgets, Network, ...)
prelockd - Lock executables and shared libraries in memory to improve system responsiveness under low-memory conditions
EASTL - Obsolete repo, please go to: https://github.com/electronicarts/EASTL
darling - Darwin/macOS emulation layer for Linux
BDE - Basic Development Environment - a set of foundational C++ libraries used at Bloomberg.