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

Potential security issues in mimalloc-secure Open

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

microsoft/mimalloc#372 · 8 comments · Opened Feb 24, 2021
Windows crash on exit v2.0 Open

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

microsoft/mimalloc#371 · 1 comment · Opened Feb 23, 2021
Update the benchmarks with Jemalloc master Open

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

microsoft/mimalloc#370 · 13 comments · Opened Feb 23, 2021
Incorrect masks used in mi_bitmap_is_claimedx_across Open

Difficulty 2/5 1-3 hours Newbie friendliness 64/100

microsoft/mimalloc#368 · 1 comment · Opened Feb 22, 2021
Lock-freeness Open

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

microsoft/mimalloc#366 · 6 comments · Opened Feb 19, 2021
Possibility to create a heap with a fixed reserved size Open

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

microsoft/mimalloc#364 · 5 comments · 2 reactions · Opened Feb 18, 2021
Incorrect assertion during memory release in thread (memory allocated in main thread) Open

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

microsoft/mimalloc#363 · 2 comments · Opened Feb 17, 2021
Confusing debug prints Open

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

microsoft/mimalloc#360 · 11 comments · 1 reaction · Opened Feb 11, 2021
CMake install doesn't honor install prefix Open

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

microsoft/mimalloc#359 · 4 comments · Opened Feb 3, 2021
Hey can you add a ENV Variable to redirect memory allocations (NUMA) (WIN) Open

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

microsoft/mimalloc#358 · Opened Feb 3, 2021
Assertion failed on Apple arm64 Open

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

microsoft/mimalloc#354 · 11 comments · Opened Feb 1, 2021
Tuning excessive memory retention Open

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

microsoft/mimalloc#351 · 3 comments · Opened Jan 25, 2021
MacOS Dynamic Linking Corruption Error Open

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

microsoft/mimalloc#347 · 3 comments · 1 reaction · Opened Jan 11, 2021
php 5.6.40-swoole-1.10.5 module with mimalloc lastest version crashed Open

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

microsoft/mimalloc#345 · Opened Dec 22, 2020
Segmentation fault on Apple Silicon / arm64 Open

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

microsoft/mimalloc#343 · 26 comments · Opened Dec 15, 2020
NDK compilation with x86 ABI report warning: [-Watomic-alignment] Open

Difficulty 3/5 1-2 days Newbie friendliness 25/100

microsoft/mimalloc#341 · 1 comment · Opened Dec 12, 2020
mimalloc 1.6.7 crash on exit Open

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

microsoft/mimalloc#338 · 3 comments · Opened Dec 10, 2020
mem_region_s::commit is out of sync with VirtualAlloc on Windows Open

Difficulty 4/5 3-5 days Newbie friendliness 42/100

microsoft/mimalloc#336 · 4 comments · Opened Dec 7, 2020
Determine peak heap usage when using mimalloc_reserve_os_memory Open

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

microsoft/mimalloc#335 · 3 comments · Opened Dec 7, 2020
readme's environmental option defaults? Open

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

microsoft/mimalloc#334 · 2 comments · Opened Dec 5, 2020
memory reclamation Open

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

microsoft/mimalloc#333 · 6 comments · 2 reactions · Opened Nov 24, 2020
ios crash Open

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

microsoft/mimalloc#332 · 3 comments · Opened Nov 23, 2020
Test problems on Raspberry Pi Open

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

microsoft/mimalloc#320 · Opened Oct 17, 2020
mimalloc crashes with asan Open

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

microsoft/mimalloc#317 · 10 comments · Opened Oct 14, 2020
mimalloc doesn't compile on x32 ABI Open

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

microsoft/mimalloc#316 · 3 comments · Opened Oct 14, 2020
Consider using restartable sequences Open

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

microsoft/mimalloc#315 · 3 comments · 3 reactions · Opened Oct 13, 2020
`mi_malloc_satisfies_alignment` returns false for small alignments Open

Difficulty 3/5 1-2 days Newbie friendliness 28/100

microsoft/mimalloc#314 · 2 comments · Opened Oct 13, 2020
Avoiding mi_cfree on mac interpose mode Open

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

microsoft/mimalloc#313 · 2 comments · Opened Oct 13, 2020
ArcHeap checking (issue #161 follow-up) Open

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

microsoft/mimalloc#312 · 5 comments · Opened Oct 9, 2020
Thread local storage and QNX Open

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

microsoft/mimalloc#309 · 12 comments · Opened Oct 5, 2020
Document WASM usage Open

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

microsoft/mimalloc#308 · 1 comment · 2 reactions · Opened Sep 28, 2020
program crashed on c# Pinvoke Open

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

microsoft/mimalloc#306 · 1 comment · Opened Sep 16, 2020
Negative current statistic Open

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

microsoft/mimalloc#301 · 3 comments · Opened Sep 7, 2020
[Ask for help] Use mimalloc Heap for GC? Open

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

microsoft/mimalloc#298 · 2 comments · Opened Sep 5, 2020
Set process memory limit Open

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

microsoft/mimalloc#295 · 13 comments · Opened Aug 24, 2020
mimalloc slower than glibc 2.30 Open

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

microsoft/mimalloc#293 · 3 comments · Opened Aug 20, 2020
Periodic releases of benchmarking results? Open

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

microsoft/mimalloc#290 · 2 comments · 1 reaction · Opened Aug 13, 2020
Memory leak when statically linked mimalloc to a dll, which is unloaded via a non main thread Open

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

microsoft/mimalloc#288 · 3 comments · Opened Aug 8, 2020
mi_new () Open

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

microsoft/mimalloc#286 · 2 comments · Opened Aug 7, 2020
Static override on Windows Open

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

microsoft/mimalloc#268 · 5 comments · 5 reactions · Opened Jul 1, 2020
Get fresh global statistics Open

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

microsoft/mimalloc#265 · 14 comments · Opened Jun 23, 2020
port to iOS Open

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

microsoft/mimalloc#263 · 13 comments · Opened Jun 18, 2020
Crashes with deleting memory allocated in dlls Open

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

microsoft/mimalloc#261 · 19 comments · Opened Jun 16, 2020
why overriding new/delete operator in c++ with mimalloc-new-delete.h has better performance? Open

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

microsoft/mimalloc#258 · 2 comments · Opened Jun 10, 2020
mimalloc override + valgrind Open

Difficulty 4/5 3-5 days Newbie friendliness 42/100

microsoft/mimalloc#251 · 22 comments · Opened May 23, 2020
preloaded mimalloc makes 'man' crash with weird error (linux) Open

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

microsoft/mimalloc#249 · Opened May 20, 2020
Notify huge and giant allocations through callback Open

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

microsoft/mimalloc#248 · Opened May 19, 2020
Steam webviews repeatedly crash when preloading libmimalloc.so (linux) Open

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

microsoft/mimalloc#244 · 13 comments · Opened May 14, 2020
Multiple definitions of *alloc when compiling with -static Open

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

microsoft/mimalloc#243 · 1 comment · Opened May 11, 2020
Make install places files in invalid paths Open

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

microsoft/mimalloc#223 · 6 comments · 2 reactions · Opened Apr 8, 2020

microsoft/mimalloc

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