snmalloc
memory
snmalloc | memory | |
---|---|---|
8 | 1 | |
1,491 | 1,450 | |
1.3% | - | |
6.3 | 5.0 | |
about 1 month ago | 4 months ago | |
C++ | C++ | |
MIT License | zlib License |
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snmalloc
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Snmalloc: A Message Passing Allocator
https://github.com/microsoft/snmalloc#snmalloc mentions two biggest motivations as:
> Allocations on one thread are freed by a different thread
I can imagine one use-case for this: a task that is scheduled from and executed by a work-stealing thread-pool can allocate memory in one thread but by design there's no guarantee that the memory will be necessarily freed from that exact thread. Would that be a good use-case for snmalloc?
> Deallocations occur in large batches
This sounds much like a bump allocator use-case but which can do this exact thing by calling a single munmap(addr, len) and unmap multiple allocations all at once.
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Is the JVM a upside or downside to Scala?
Yes, it's very efficient and that's not where the main problem lies. However, small allocations with modern C heap allocators like mimalloc or snmalloc has gotten extremely efficient as well. Would be interesting to see a benchmark comparison with Java's G1 and ZGC.
- Snmalloc 0.6 released, major redesign with security hardening
- Snmalloc: High-performance message passing based allocator
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Maintenance status (jemallocator)
Did you ever benchmark against https://github.com/microsoft/snmalloc ?
memory
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You all need to stop blindly recommending 32 GB of RAM
In general you'll get a lot of interesting information if you search for "cache locality", "data locality", "custom memory allocation" and read stuff that people have written on github (for example https://github.com/foonathan/memory).
What are some alternatives?
mimalloc - mimalloc is a compact general purpose allocator with excellent performance.
o1heap - Constant-complexity deterministic memory allocator (heap) for hard real-time high-integrity embedded systems. There is very little activity because the project is finished and does not require further changes.
jemallocator - Rust allocator using jemalloc as a backend
Mesh - A memory allocator that automatically reduces the memory footprint of C/C++ applications.
memory-allocators - Custom memory allocators in C++ to improve the performance of dynamic memory allocation
mimalloc_rust - A Rust wrapper over Microsoft's MiMalloc memory allocator
lfjson - A memory-optimized and data-oriented JSON library written in C++
jemallocator - Rust allocator using jemalloc as a backend
mlaas - Simply the best way to instill a sense of urgency within your engineering team.
rpmalloc - Public domain cross platform lock free thread caching 16-byte aligned memory allocator implemented in C