microsoft/snmalloc

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Message passing based allocator

Stars: 2k
Forks: 138
Open beginner issues: 0
Indexed issues: 34
Avg merge: 11h 19m
Merged PRs (30d): 5

Dominant language: C++
License: MIT
Last GitHub push: Sep 18, 2026
Latest indexed: Sep 19, 2026
Contributing guide: No contributing guide
Code of conduct: Code of conduct
Beginner labels: help wanted good first issue

Beginner friendly Everything

Open All

34 open issues indexed

MSVC ARM64 internal compiler error when building static shim on Windows ARM64 Open

Difficulty 4/5 3-5 days Newbie friendliness 38/100

microsoft/snmalloc#862 · 3 comments · Opened Jun 23, 2026
RISC-V Linux: flat pagemap reservation is too large on Sv39 Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

microsoft/snmalloc#861 · Opened Jun 21, 2026
Design: heap profiling for snmalloc Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

microsoft/snmalloc#853 · 4 comments · Opened May 28, 2026
Persistent Memory Growth / Failure to Deallocate under high Object Store Load (DataFusion + delta-rs) Open

Difficulty 4/5 3-5 days Newbie friendliness 30/100

microsoft/snmalloc#846 · 8 comments · Opened May 8, 2026
Coverage tracker (auto-updated) Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

microsoft/snmalloc#843 · Opened May 6, 2026
Pointer-Authentication Based Forward Edge Protection Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

microsoft/snmalloc#838 · 4 comments · Opened Mar 29, 2026
Capability Analysis and Lifetime Analysis Open

Difficulty 5/5 Over a week Newbie friendliness 30/100

microsoft/snmalloc#836 · Opened Mar 29, 2026
Examine hardened compiler performance impact. Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

microsoft/snmalloc#820 · 1 reaction · Opened Feb 26, 2026
Committed memory growing over time Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

microsoft/snmalloc#814 · 13 comments · Opened Feb 24, 2026
Transient workloads with large object alloc & dealloc pairs thrash slabs back and forth from the kernel Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

microsoft/snmalloc#811 · 3 comments · Opened Feb 20, 2026
snmalloc pessimal performance in post-main cleanup Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

microsoft/snmalloc#809 · 21 comments · Opened Feb 5, 2026
Aarch64 LSE 16-byte CAS operation Open

Difficulty 3/5 1-2 days Newbie friendliness 38/100

microsoft/snmalloc#796 · 2 comments · Opened Aug 10, 2025
Heap walk functionality that is compatible with the Windows Heap API. Open

enhancement

Difficulty 5/5 Over a week Newbie friendliness 25/100

microsoft/snmalloc#787 · 2 comments · Opened Jul 2, 2025
Implement accurate size storage for Windows `_msize` and `_recalloc` Open

enhancement good first issue

Difficulty 4/5 3-5 days Newbie friendliness 35/100

microsoft/snmalloc#786 · Opened Jul 2, 2025
Implement basic Detours Functionality to replace malloc/free/etc with symbols from snmalloc. Open

enhancement

microsoft/snmalloc#783 · 1 comment · 1 assignee · Opened Jul 2, 2025
Improve Overriding on Windows Open

enhancement

Difficulty 5/5 Over a week Newbie friendliness 20/100

microsoft/snmalloc#782 · Opened Jul 2, 2025
MiMalloc 3 Comparison Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

microsoft/snmalloc#781 · 4 comments · Opened Jul 1, 2025
PowerPC CI Open

CI platforms

Difficulty 4/5 3-5 days Newbie friendliness 25/100

microsoft/snmalloc#769 · 1 reaction · Opened Apr 28, 2025
Fixed range relying on lazy commit? Open

performance

Difficulty 4/5 3-5 days Newbie friendliness 35/100

microsoft/snmalloc#755 · 17 comments · Opened Mar 5, 2025
Extend secondary allocation support Open

enhancement

Difficulty 5/5 Over a week Newbie friendliness 15/100

microsoft/snmalloc#740 · 1 comment · Opened Feb 5, 2025
Explore: Alter handling of free batches. Open

enhancement

Difficulty 5/5 Over a week Newbie friendliness 20/100

microsoft/snmalloc#728 · Opened Jan 7, 2025
Windows: how to override malloc / free / new / delete globally ? Open

platforms windows

Difficulty 5/5 Over a week Newbie friendliness 25/100

microsoft/snmalloc#700 · 9 comments · Opened Dec 1, 2024
Reserve and limit memory usage? Open

enhancement

Difficulty 5/5 Over a week Newbie friendliness 25/100

microsoft/snmalloc#655 · 3 comments · Opened Jan 30, 2024
Using mmap to zero memory: performance questions and CHERI incompatibility Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

microsoft/snmalloc#642 · 3 comments · Opened Oct 4, 2023
OpenBSD support Open

OpenBSD platforms

Difficulty 5/5 Over a week Newbie friendliness 25/100

microsoft/snmalloc#594 · 8 comments · Opened Feb 22, 2023
`range_to_pow_2_blocks` can underflow `length` (`size_t`) Open

repro needed

Difficulty 3/5 1-2 days Newbie friendliness 45/100

microsoft/snmalloc#567 · 7 comments · Opened Oct 11, 2022
__builtin_dynamic_object_size and snmalloc Open

enhancement

Difficulty 5/5 Over a week Newbie friendliness 25/100

microsoft/snmalloc#531 · 9 comments · Opened May 24, 2022
16 byte cmpxchg Open

enhancement

Difficulty 5/5 Over a week Newbie friendliness 25/100

microsoft/snmalloc#524 · 4 comments · Opened May 11, 2022
Large OS pages support Open

enhancement windows

Difficulty 5/5 Over a week Newbie friendliness 35/100

microsoft/snmalloc#485 · 4 comments · Opened Mar 20, 2022
allocator purge exposure ? Open

enhancement

Difficulty 5/5 Over a week Newbie friendliness 25/100

microsoft/snmalloc#436 · 1 comment · Opened Dec 1, 2021
fallible memory allocation Open

enhancement

Difficulty 5/5 Over a week Newbie friendliness 25/100

microsoft/snmalloc#423 · 4 comments · Opened Nov 18, 2021
metrics of snmalloc Open

enhancement

Difficulty 5/5 Over a week Newbie friendliness 25/100

microsoft/snmalloc#409 · 13 comments · Opened Oct 24, 2021
Add alignment to the surface API Open

enhancement help wanted

Difficulty 4/5 3-5 days Newbie friendliness 35/100

microsoft/snmalloc#114 · 1 comment · Opened Jan 22, 2020
malloc_history equivalent Open

enhancement help wanted

Difficulty 5/5 Over a week Newbie friendliness 25/100

microsoft/snmalloc#91 · Opened Aug 20, 2019

microsoft/snmalloc

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