microsoft/mimalloc

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mimalloc is a compact general purpose allocator with excellent performance.

Stars: 13.4k
Forks: 1.2k
Open beginner issues: 1
Indexed issues: 264
Avg merge: 4d 45m
Merged PRs (30d): 13

Dominant language: C
License: MIT
Last GitHub push: Sep 17, 2026
Latest indexed: Sep 19, 2026
Contributing guide: No contributing guide
Code of conduct: Code of conduct
Beginner labels: No beginner labels indexed

Beginner friendly Everything

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264 open issues indexed

How to disable mimalloc at runtime Open

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

microsoft/mimalloc#578 · 1 comment · Opened Apr 24, 2022
Using synchronized_pool_resource with largest_required_pool_block > 1mb does not work Open

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

microsoft/mimalloc#576 · 3 comments · Opened Apr 20, 2022
Mimalloc with vcpkg on Windows Open

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

microsoft/mimalloc#575 · 9 comments · Opened Apr 17, 2022
question about internal fragmentation limits Open

Difficulty 2/5 1-3 hours Newbie friendliness 35/100

microsoft/mimalloc#573 · 2 comments · Opened Apr 11, 2022
The app crashes on startup for some users Open

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

microsoft/mimalloc#566 · 6 comments · Opened Mar 28, 2022
Move a heap to a new thread? Open

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

microsoft/mimalloc#561 · 1 comment · Opened Mar 15, 2022
Multiple definition errors when including mimalloc-new-delete.h. Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

microsoft/mimalloc#559 · 3 comments · Opened Mar 11, 2022
expose mi_stats_t via public interfaces Open

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

microsoft/mimalloc#558 · 1 comment · 1 reaction · Opened Mar 10, 2022
mimalloc is incompatible with musl libc on arm64 device Open

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

microsoft/mimalloc#556 · 11 comments · 3 reactions · Opened Mar 4, 2022
mi_malloc is called before mimalloc-override.dll:DllMain (at least in mimalloc-override-test) Open

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

microsoft/mimalloc#555 · 3 comments · Opened Mar 2, 2022
how to use mimalloc to replace the stl::allcator Open

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

microsoft/mimalloc#554 · 2 comments · Opened Mar 1, 2022
Huge chunk of time spent on _mi_page_retire normal? Open

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

microsoft/mimalloc#547 · 2 comments · Opened Feb 17, 2022
Issues with MinGW-built mimalloc DLL Open

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

microsoft/mimalloc#542 · 13 comments · Opened Feb 5, 2022
Crash in _mi_heap_delayed_free in Windows 10 (64 bit) Open

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

microsoft/mimalloc#541 · 8 comments · Opened Jan 28, 2022
High virtual memory usage, reset_decommits doesn't work Open

Difficulty 4/5 3-5 days Newbie friendliness 32/100

microsoft/mimalloc#537 · 17 comments · Opened Jan 26, 2022
Question about mi_collect Open

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

microsoft/mimalloc#536 · 2 comments · Opened Jan 25, 2022
Clarification of MI_OVERRIDE and mimalloc-new-delete.h Open

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

microsoft/mimalloc#535 · 5 comments · Opened Jan 24, 2022
Don't silently ignore MI_OVERRIDE Open

Difficulty 2/5 1-3 hours Newbie friendliness 55/100

microsoft/mimalloc#534 · 1 comment · Opened Jan 22, 2022
How to use object file with cmake? Open

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

microsoft/mimalloc#532 · 4 comments · Opened Jan 21, 2022
install folder for .dll in mingw (msys2) Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

microsoft/mimalloc#514 · 4 comments · Opened Dec 30, 2021
Heap corruption on macOS x64 in `getaddrinfo()` when using object file Open

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

microsoft/mimalloc#512 · 3 comments · Opened Dec 28, 2021
Difference between mimalloc's freed report and valgrind --leak-check=full Open

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

microsoft/mimalloc#509 · 4 comments · Opened Dec 21, 2021
Heaps and C++ static destructors Open

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

microsoft/mimalloc#508 · 20 comments · Opened Dec 20, 2021
Application using redirection to mimalloc crashes on Windows 11 when opening a file dialog Open

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

microsoft/mimalloc#498 · 25 comments · Opened Dec 14, 2021
Crash in `mi_process_done` on M1 (when exiting) Open

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

microsoft/mimalloc#491 · 1 comment · Opened Dec 1, 2021
Document supported OS, architectures, and compilers Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

microsoft/mimalloc#482 · 8 comments · Opened Oct 27, 2021
Crash in mi_segment_init Open

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

microsoft/mimalloc#469 · 7 comments · Opened Oct 20, 2021
HI, could you estimate when dev-slice branch(v2.x) become stable release. Open

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

microsoft/mimalloc#466 · 1 comment · Opened Oct 18, 2021
v2 performance regression in heavy allocation scenario (a lot of syscalls) Open

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

microsoft/mimalloc#447 · 13 comments · 7 reactions · Opened Jul 22, 2021
Buggy statistics reporting in stable and v2.0.2? Open

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

microsoft/mimalloc#441 · 1 comment · 2 reactions · Opened Jul 12, 2021
Can't launch my app when use the dynamical lib of mimalloc in IOS Open

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

microsoft/mimalloc#437 · 7 comments · Opened Jul 7, 2021
Coroutine-based Isolation Open

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

microsoft/mimalloc#436 · Opened Jul 6, 2021
IOS crash --- "pointer being freed was not allocated" Open

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

microsoft/mimalloc#435 · 2 comments · Opened Jul 5, 2021
Could mimalloc work on objectc project? Open

Difficulty 4/5 3-5 days Newbie friendliness 20/100

microsoft/mimalloc#434 · Opened Jul 5, 2021
How to set options to mimalloc before mi_process_init Open

Difficulty 2/5 1-3 hours Newbie friendliness 30/100

microsoft/mimalloc#433 · 2 comments · Opened Jul 1, 2021
The value that can be passed to the `offset` parameter of `mi_malloc_aligned_at()` Open

Difficulty 2/5 1-3 hours Newbie friendliness 35/100

microsoft/mimalloc#417 · 1 comment · Opened Jun 15, 2021
Performance impact of mi_collect Open

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

microsoft/mimalloc#416 · 1 comment · Opened Jun 15, 2021
How mimalloc behave when allocating a really large memory block? Open

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

microsoft/mimalloc#413 · 1 comment · Opened Jun 4, 2021
Mimalloc together with MFC on Windows causes link errors Open

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

microsoft/mimalloc#408 · 2 comments · Opened May 27, 2021
concurrent collection gc Open

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

microsoft/mimalloc#402 · 1 comment · Opened May 8, 2021
Installs libmimalloc.a into $PREFIX instead of into $PREFIX/lib Open

Difficulty 2/5 1-3 hours Newbie friendliness 48/100

microsoft/mimalloc#398 · 3 comments · Opened May 2, 2021
Need guidelines around max memory usage Open

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

microsoft/mimalloc#393 · 2 comments · Opened Apr 23, 2021
livelock encountered in RTOS Open

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

microsoft/mimalloc#386 · 1 comment · Opened Apr 11, 2021
Question about releasing memory Open

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

microsoft/mimalloc#383 · 7 comments · 1 reaction · Opened Apr 6, 2021
Segfault on Android when running provided demo 'mimalloc-test-api' Open

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

microsoft/mimalloc#381 · 8 comments · Opened Mar 29, 2021
under what situation mi_new could fail and how to get more info when crashes Open

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

microsoft/mimalloc#379 · 1 comment · Opened Mar 20, 2021
Loading C++ dll from C# executable with mimalloc Open

Difficulty 4/5 3-5 days Newbie friendliness 20/100

microsoft/mimalloc#378 · Opened Mar 12, 2021
PHP Failing to free(), Stating Invalid Pointers Open

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

microsoft/mimalloc#377 · 3 comments · Opened Mar 11, 2021
Is it possible to do an aligned allocation with negative offset? Open

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

microsoft/mimalloc#374 · Opened Mar 5, 2021
How to use mi_register_deferred_free to implement reference counting? Open

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

microsoft/mimalloc#373 · Opened Feb 28, 2021

microsoft/mimalloc

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