464 lines
22 KiB
Markdown
464 lines
22 KiB
Markdown
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<img align="left" width="100" height="100" src="doc/mimalloc-logo.png"/>
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[<img align="right" src="https://dev.azure.com/Daan0324/mimalloc/_apis/build/status/microsoft.mimalloc?branchName=master"/>](https://dev.azure.com/Daan0324/mimalloc/_build?definitionId=1&_a=summary)
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# mimalloc
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mimalloc (pronounced "me-malloc")
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is a general purpose allocator with excellent [performance](#performance) characteristics.
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Initially developed by Daan Leijen for the run-time systems of the
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[Koka](https://github.com/koka-lang/koka) and [Lean](https://github.com/leanprover/lean) languages.
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It is a drop-in replacement for `malloc` and can be used in other programs
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without code changes, for example, on dynamically linked ELF-based systems (Linux, BSD, etc.) you can use it as:
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```
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> LD_PRELOAD=/usr/bin/libmimalloc.so myprogram
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```
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Notable aspects of the design include:
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- __small and consistent__: the library is less than 3500 LOC using simple and
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consistent data structures. This makes it very suitable
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to integrate and adapt in other projects. For runtime systems it
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provides hooks for a monotonic _heartbeat_ and deferred freeing (for
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bounded worst-case times with reference counting).
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- __free list sharding__: the big idea: instead of one big free list (per size class) we have
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many smaller lists per memory "page" which both reduces fragmentation
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and increases locality --
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things that are allocated close in time get allocated close in memory.
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(A memory "page" in _mimalloc_ contains blocks of one size class and is
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usually 64KiB on a 64-bit system).
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- __eager page reset__: when a "page" becomes empty (with increased chance
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due to free list sharding) the memory is marked to the OS as unused ("reset" or "purged")
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reducing (real) memory pressure and fragmentation, especially in long running
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programs.
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- __secure__: _mimalloc_ can be built in secure mode, adding guard pages,
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randomized allocation, encrypted free lists, etc. to protect against various
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heap vulnerabilities. The performance penalty is only around 3% on average
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over our benchmarks.
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- __first-class heaps__: efficiently create and use multiple heaps to allocate across different regions.
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A heap can be destroyed at once instead of deallocating each object separately.
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- __bounded__: it does not suffer from _blowup_ \[1\], has bounded worst-case allocation
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times (_wcat_), bounded space overhead (~0.2% meta-data, with at most 16.7% waste in allocation sizes),
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and has no internal points of contention using only atomic operations.
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- __fast__: In our benchmarks (see [below](#performance)),
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_mimalloc_ always outperforms all other leading allocators (_jemalloc_, _tcmalloc_, _Hoard_, etc),
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and usually uses less memory (up to 25% more in the worst case). A nice property
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is that it does consistently well over a wide range of benchmarks.
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The [documentation](https://microsoft.github.io/mimalloc) gives a full overview of the API.
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You can read more on the design of _mimalloc_ in the [technical report](https://www.microsoft.com/en-us/research/publication/mimalloc-free-list-sharding-in-action) which also has detailed benchmark results.
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Enjoy!
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### Releases
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* 2019-08-10, `v1.0.6`: pre-release 6: various performance improvements.
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* 2019-09-01, `v1.0.8`: pre-release 8: more robust windows dynamic overriding, initial huge page support.
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# Building
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## Windows
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Open `ide/vs2017/mimalloc.sln` in Visual Studio 2017 and build.
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The `mimalloc` project builds a static library (in `out/msvc-x64`), while the
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`mimalloc-override` project builds a DLL for overriding malloc
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in the entire program.
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## macOS, Linux, BSD, etc.
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We use [`cmake`](https://cmake.org)<sup>1</sup> as the build system:
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```
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> mkdir -p out/release
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> cd out/release
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> cmake ../..
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> make
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```
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This builds the library as a shared (dynamic)
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library (`.so` or `.dylib`), a static library (`.a`), and
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as a single object file (`.o`).
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`> sudo make install` (install the library and header files in `/usr/local/lib` and `/usr/local/include`)
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You can build the debug version which does many internal checks and
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maintains detailed statistics as:
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```
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> mkdir -p out/debug
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> cd out/debug
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> cmake -DCMAKE_BUILD_TYPE=Debug ../..
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> make
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```
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This will name the shared library as `libmimalloc-debug.so`.
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Finally, you can build a _secure_ version that uses guard pages, encrypted
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free lists, etc, as:
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```
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> mkdir -p out/secure
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> cd out/secure
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> cmake -DMI_SECURE=ON ../..
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> make
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```
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This will name the shared library as `libmimalloc-secure.so`.
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Use `ccmake`<sup>2</sup> instead of `cmake`
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to see and customize all the available build options.
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Notes:
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1. Install CMake: `sudo apt-get install cmake`
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2. Install CCMake: `sudo apt-get install cmake-curses-gui`
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# Using the library
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The preferred usage is including `<mimalloc.h>`, linking with
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the shared- or static library, and using the `mi_malloc` API exclusively for allocation. For example,
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```
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> gcc -o myprogram -lmimalloc myfile.c
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```
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mimalloc uses only safe OS calls (`mmap` and `VirtualAlloc`) and can co-exist
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with other allocators linked to the same program.
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If you use `cmake`, you can simply use:
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```
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find_package(mimalloc 1.0 REQUIRED)
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```
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in your `CMakeLists.txt` to find a locally installed mimalloc. Then use either:
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```
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target_link_libraries(myapp PUBLIC mimalloc)
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```
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to link with the shared (dynamic) library, or:
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```
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target_link_libraries(myapp PUBLIC mimalloc-static)
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```
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to link with the static library. See `test\CMakeLists.txt` for an example.
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You can pass environment variables to print verbose messages (`MIMALLOC_VERBOSE=1`)
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and statistics (`MIMALLOC_SHOW_STATS=1`) (in the debug version):
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```
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> env MIMALLOC_SHOW_STATS=1 ./cfrac 175451865205073170563711388363
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175451865205073170563711388363 = 374456281610909315237213 * 468551
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heap stats: peak total freed unit
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normal 2: 16.4 kb 17.5 mb 17.5 mb 16 b ok
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normal 3: 16.3 kb 15.2 mb 15.2 mb 24 b ok
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normal 4: 64 b 4.6 kb 4.6 kb 32 b ok
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normal 5: 80 b 118.4 kb 118.4 kb 40 b ok
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normal 6: 48 b 48 b 48 b 48 b ok
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normal 17: 960 b 960 b 960 b 320 b ok
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heap stats: peak total freed unit
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normal: 33.9 kb 32.8 mb 32.8 mb 1 b ok
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huge: 0 b 0 b 0 b 1 b ok
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total: 33.9 kb 32.8 mb 32.8 mb 1 b ok
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malloc requested: 32.8 mb
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committed: 58.2 kb 58.2 kb 58.2 kb 1 b ok
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reserved: 2.0 mb 2.0 mb 2.0 mb 1 b ok
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reset: 0 b 0 b 0 b 1 b ok
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segments: 1 1 1
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-abandoned: 0
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pages: 6 6 6
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-abandoned: 0
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mmaps: 3
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mmap fast: 0
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mmap slow: 1
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threads: 0
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elapsed: 2.022s
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process: user: 1.781s, system: 0.016s, faults: 756, reclaims: 0, rss: 2.7 mb
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```
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The above model of using the `mi_` prefixed API is not always possible
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though in existing programs that already use the standard malloc interface,
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and another option is to override the standard malloc interface
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completely and redirect all calls to the _mimalloc_ library instead.
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## Environment Options
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You can set further options either programmatically (using [`mi_option_set`](https://microsoft.github.io/mimalloc/group__options.html)),
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or via environment variables.
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- `MIMALLOC_SHOW_STATS=1`: show statistics when the program terminates.
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- `MIMALLOC_VERBOSE=1`: show verbose messages.
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- `MIMALLOC_SHOW_ERRORS=1`: show error and warning messages.
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- `MIMALLOC_LARGE_OS_PAGES=1`: use large OS pages when available; for some workloads this can significantly
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improve performance. Use `MIMALLOC_VERBOSE` to check if the large OS pages are enabled -- usually one needs
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to explicitly allow large OS pages (as on [Windows][windows-huge] and [Linux][linux-huge]). However, sometimes
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the OS is very slow to reserve contiguous physical memory for large OS pages so use with care on systems that
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can have fragmented memory.
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- `MIMALLOC_EAGER_REGION_COMMIT=1`: on Windows, commit large (256MiB) regions eagerly. On Windows, these regions
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show in the working set even though usually just a small part is committed to physical memory. This is why it
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turned off by default on Windows as it looks not good in the task manager. However, in reality it is always better
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to turn it on as it improves performance and has no other drawbacks.
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- `MIMALLOC_RESERVE_HUGE_OS_PAGES=N`: where N is the number of 1GiB huge OS pages. This reserves the huge pages at
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startup and can give quite a performance improvement on long running workloads. Usually it is better to not use
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`MIMALLOC_LARGE_OS_PAGES` in combination with this setting. Just like large OS pages, use with care as reserving
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contiguous physical memory can take a long time when memory is fragmented. Still experimental.
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[linux-huge]: https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/5/html/tuning_and_optimizing_red_hat_enterprise_linux_for_oracle_9i_and_10g_databases/sect-oracle_9i_and_10g_tuning_guide-large_memory_optimization_big_pages_and_huge_pages-configuring_huge_pages_in_red_hat_enterprise_linux_4_or_5
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[windows-huge]: https://docs.microsoft.com/en-us/sql/database-engine/configure-windows/enable-the-lock-pages-in-memory-option-windows?view=sql-server-2017
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# Overriding Malloc
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Overriding the standard `malloc` can be done either _dynamically_ or _statically_.
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## Dynamic override
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This is the recommended way to override the standard malloc interface.
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### Linux, BSD
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On these ELF-based systems we preload the mimalloc shared
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library so all calls to the standard `malloc` interface are
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resolved to the _mimalloc_ library.
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```
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> env LD_PRELOAD=/usr/lib/libmimalloc.so myprogram
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```
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You can set extra environment variables to check that mimalloc is running,
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like:
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```
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> env MIMALLOC_VERBOSE=1 LD_PRELOAD=/usr/lib/libmimalloc.so myprogram
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```
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or run with the debug version to get detailed statistics:
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```
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> env MIMALLOC_SHOW_STATS=1 LD_PRELOAD=/usr/lib/libmimalloc-debug.so myprogram
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```
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### MacOS
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On macOS we can also preload the mimalloc shared
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library so all calls to the standard `malloc` interface are
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resolved to the _mimalloc_ library.
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```
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> env DYLD_FORCE_FLAT_NAMESPACE=1 DYLD_INSERT_LIBRARIES=/usr/lib/libmimalloc.dylib myprogram
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```
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Note that certain security restrictions may apply when doing this from
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the [shell](https://stackoverflow.com/questions/43941322/dyld-insert-libraries-ignored-when-calling-application-through-bash).
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Note: unfortunately, at this time, dynamic overriding on macOS seems broken but it is actively worked on to fix this
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(see issue [`#50`](https://github.com/microsoft/mimalloc/issues/50)).
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### Windows
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On Windows you need to link your program explicitly with the mimalloc
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DLL and use the C-runtime library as a DLL (using the `/MD` or `/MDd` switch).
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Moreover, you need to ensure the `mimalloc-redirect.dll` (or `mimalloc-redirect32.dll`) is available
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in the same folder as the mimalloc DLL at runtime (as it as referred to by the mimalloc DLL).
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The redirection DLL's ensure all calls to the C runtime malloc API get redirected to mimalloc.
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To ensure the mimalloc DLL is loaded at run-time it is easiest to insert some
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call to the mimalloc API in the `main` function, like `mi_version()`
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(or use the `/INCLUDE:mi_version` switch on the linker). See the `mimalloc-override-test` project
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for an example on how to use this.
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The environment variable `MIMALLOC_DISABLE_REDIRECT=1` can be used to disable dynamic
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overriding at run-time. Use `MIMALLOC_VERBOSE=1` to check if mimalloc successfully redirected.
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(Note: in principle, it should be possible to patch existing executables
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that are linked with the dynamic C runtime (`ucrtbase.dll`) by just putting the mimalloc DLL into
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the import table (and putting `mimalloc-redirect.dll` in the same folder)
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Such patching can be done for example with [CFF Explorer](https://ntcore.com/?page_id=388)).
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## Static override
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On Unix-like systems, you can also statically link with _mimalloc_ to override the standard
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malloc interface. The recommended way is to link the final program with the
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_mimalloc_ single object file (`mimalloc-override.o`). We use
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an object file instead of a library file as linkers give preference to
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that over archives to resolve symbols. To ensure that the standard
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malloc interface resolves to the _mimalloc_ library, link it as the first
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object file. For example:
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```
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> gcc -o myprogram mimalloc-override.o myfile1.c ...
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```
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# Performance
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We tested _mimalloc_ against many other top allocators over a wide
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range of benchmarks, ranging from various real world programs to
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synthetic benchmarks that see how the allocator behaves under more
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extreme circumstances.
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In our benchmarks, _mimalloc_ always outperforms all other leading
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allocators (_jemalloc_, _tcmalloc_, _Hoard_, etc), and usually uses less
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memory (up to 25% more in the worst case). A nice property is that it
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does *consistently* well over the wide range of benchmarks.
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Allocators are interesting as there exists no algorithm that is generally
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optimal -- for a given allocator one can usually construct a workload
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where it does not do so well. The goal is thus to find an allocation
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strategy that performs well over a wide range of benchmarks without
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suffering from underperformance in less common situations (which is what
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the second half of our benchmark set tests for).
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We show here only the results on an AMD EPYC system (Apr 2019) -- for
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specific details and further benchmarks we refer to the [technical report](https://www.microsoft.com/en-us/research/publication/mimalloc-free-list-sharding-in-action).
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The benchmark suite is scripted and available separately
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as [mimalloc-bench](https://github.com/daanx/mimalloc-bench).
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## Benchmark Results
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Testing on a big Amazon EC2 instance ([r5a.4xlarge](https://aws.amazon.com/ec2/instance-types/))
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consisting of a 16-core AMD EPYC 7000 at 2.5GHz
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with 128GB ECC memory, running Ubuntu 18.04.1 with LibC 2.27 and GCC 7.3.0.
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The measured allocators are _mimalloc_ (mi),
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Google's [_tcmalloc_](https://github.com/gperftools/gperftools) (tc) used in Chrome,
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[_jemalloc_](https://github.com/jemalloc/jemalloc) (je) by Jason Evans used in Firefox and FreeBSD,
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[_snmalloc_](https://github.com/microsoft/snmalloc) (sn) by Liétar et al. \[8], [_rpmalloc_](https://github.com/rampantpixels/rpmalloc) (rp) by Mattias Jansson at Rampant Pixels,
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[_Hoard_](https://github.com/emeryberger/Hoard) by Emery Berger \[1],
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the system allocator (glibc) (based on _PtMalloc2_), and the Intel thread
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building blocks [allocator](https://github.com/intel/tbb) (tbb).
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Memory usage:
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(note: the _xmalloc-testN_ memory usage should be disregarded as it
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allocates more the faster the program runs).
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In the first five benchmarks we can see _mimalloc_ outperforms the other
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allocators moderately, but we also see that all these modern allocators
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perform well -- the times of large performance differences in regular
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workloads are over :-).
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In _cfrac_ and _espresso_, _mimalloc_ is a tad faster than _tcmalloc_ and
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_jemalloc_, but a solid 10\% faster than all other allocators on
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_espresso_. The _tbb_ allocator does not do so well here and lags more than
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20\% behind _mimalloc_. The _cfrac_ and _espresso_ programs do not use much
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memory (~1.5MB) so it does not matter too much, but still _mimalloc_ uses
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about half the resident memory of _tcmalloc_.
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The _leanN_ program is most interesting as a large realistic and
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concurrent workload of the [Lean](https://github.com/leanprover/lean) theorem prover
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compiling its own standard library, and there is a 8% speedup over _tcmalloc_. This is
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quite significant: if Lean spends 20% of its time in the
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allocator that means that _mimalloc_ is 1.3× faster than _tcmalloc_
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here. (This is surprising as that is not measured in a pure
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allocation benchmark like _alloc-test_. We conjecture that we see this
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outsized improvement here because _mimalloc_ has better locality in
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the allocation which improves performance for the *other* computations
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in a program as well).
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The _redis_ benchmark shows more differences between the allocators where
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_mimalloc_ is 14\% faster than _jemalloc_. On this benchmark _tbb_ (and _Hoard_) do
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not do well and are over 40\% slower.
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The _larson_ server workload allocates and frees objects between
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many threads. Larson and Krishnan \[2] observe this
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behavior (which they call _bleeding_) in actual server applications, and the
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benchmark simulates this.
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Here, _mimalloc_ is more than 2.5× faster than _tcmalloc_ and _jemalloc_
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due to the object migration between different threads. This is a difficult
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benchmark for other allocators too where _mimalloc_ is still 48% faster than the next
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fastest (_snmalloc_).
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The second benchmark set tests specific aspects of the allocators and
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shows even more extreme differences between them.
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The _alloc-test_, by
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[OLogN Technologies AG](http://ithare.com/testing-memory-allocators-ptmalloc2-tcmalloc-hoard-jemalloc-while-trying-to-simulate-real-world-loads/), is a very allocation intensive benchmark doing millions of
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allocations in various size classes. The test is scaled such that when an
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allocator performs almost identically on _alloc-test1_ as _alloc-testN_ it
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means that it scales linearly. Here, _tcmalloc_, _snmalloc_, and
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_Hoard_ seem to scale less well and do more than 10% worse on the
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multi-core version. Even the best allocators (_tcmalloc_ and _jemalloc_) are
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more than 10% slower as _mimalloc_ here.
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The _sh6bench_ and _sh8bench_ benchmarks are
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developed by [MicroQuill](http://www.microquill.com/) as part of SmartHeap.
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In _sh6bench_ _mimalloc_ does much
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better than the others (more than 2× faster than _jemalloc_).
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We cannot explain this well but believe it is
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caused in part by the "reverse" free-ing pattern in _sh6bench_.
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Again in _sh8bench_ the _mimalloc_ allocator handles object migration
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between threads much better and is over 36% faster than the next best
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allocator, _snmalloc_. Whereas _tcmalloc_ did well on _sh6bench_, the
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addition of object migration caused it to be almost 3 times slower
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than before.
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The _xmalloc-testN_ benchmark by Lever and Boreham \[5] and Christian Eder,
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simulates an asymmetric workload where
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some threads only allocate, and others only free. The _snmalloc_
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allocator was especially developed to handle this case well as it
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often occurs in concurrent message passing systems (like the [Pony] language
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for which _snmalloc_ was initially developed). Here we see that
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the _mimalloc_ technique of having non-contended sharded thread free
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lists pays off as it even outperforms _snmalloc_ here.
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Only _jemalloc_ also handles this reasonably well, while the
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others underperform by a large margin.
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The _cache-scratch_ benchmark by Emery Berger \[1], and introduced with the Hoard
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allocator to test for _passive-false_ sharing of cache lines. With a single thread they all
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perform the same, but when running with multiple threads the potential allocator
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induced false sharing of the cache lines causes large run-time
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differences, where _mimalloc_ is more than 18× faster than _jemalloc_ and
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_tcmalloc_! Crundal \[6] describes in detail why the false cache line
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sharing occurs in the _tcmalloc_ design, and also discusses how this
|
||
can be avoided with some small implementation changes.
|
||
Only _snmalloc_ and _tbb_ also avoid the
|
||
cache line sharing like _mimalloc_. Kukanov and Voss \[7] describe in detail
|
||
how the design of _tbb_ avoids the false cache line sharing.
|
||
|
||
|
||
|
||
# References
|
||
|
||
- \[1] Emery D. Berger, Kathryn S. McKinley, Robert D. Blumofe, and Paul R. Wilson.
|
||
_Hoard: A Scalable Memory Allocator for Multithreaded Applications_
|
||
the Ninth International Conference on Architectural Support for Programming Languages and Operating Systems (ASPLOS-IX). Cambridge, MA, November 2000.
|
||
[pdf](http://www.cs.utexas.edu/users/mckinley/papers/asplos-2000.pdf)
|
||
|
||
|
||
- \[2] P. Larson and M. Krishnan. _Memory allocation for long-running server applications_. In ISMM, Vancouver, B.C., Canada, 1998.
|
||
[pdf](http://citeseer.ist.psu.edu/viewdoc/download;jsessionid=5F0BFB4F57832AEB6C11BF8257271088?doi=10.1.1.45.1947&rep=rep1&type=pdf)
|
||
|
||
- \[3] D. Grunwald, B. Zorn, and R. Henderson.
|
||
_Improving the cache locality of memory allocation_. In R. Cartwright, editor,
|
||
Proceedings of the Conference on Programming Language Design and Implementation, pages 177–186, New York, NY, USA, June 1993.
|
||
[pdf](http://citeseer.ist.psu.edu/viewdoc/download?doi=10.1.1.43.6621&rep=rep1&type=pdf)
|
||
|
||
- \[4] J. Barnes and P. Hut. _A hierarchical O(n*log(n)) force-calculation algorithm_. Nature, 324:446-449, 1986.
|
||
|
||
- \[5] C. Lever, and D. Boreham. _Malloc() Performance in a Multithreaded Linux Environment._
|
||
In USENIX Annual Technical Conference, Freenix Session. San Diego, CA. Jun. 2000.
|
||
Available at <https://github.com/kuszmaul/SuperMalloc/tree/master/tests>
|
||
|
||
- \[6] Timothy Crundal. _Reducing Active-False Sharing in TCMalloc._
|
||
2016. <http://courses.cecs.anu.edu.au/courses/CSPROJECTS/16S1/Reports/Timothy_Crundal_Report.pdf>. CS16S1 project at the Australian National University.
|
||
|
||
- \[7] Alexey Kukanov, and Michael J Voss.
|
||
_The Foundations for Scalable Multi-Core Software in Intel Threading Building Blocks._
|
||
Intel Technology Journal 11 (4). 2007
|
||
|
||
- \[8] Paul Liétar, Theodore Butler, Sylvan Clebsch, Sophia Drossopoulou, Juliana Franco, Matthew J Parkinson,
|
||
Alex Shamis, Christoph M Wintersteiger, and David Chisnall.
|
||
_Snmalloc: A Message Passing Allocator._
|
||
In Proceedings of the 2019 ACM SIGPLAN International Symposium on Memory Management, 122–135. ACM. 2019.
|
||
|
||
|
||
# Contributing
|
||
|
||
This project welcomes contributions and suggestions. Most contributions require you to agree to a
|
||
Contributor License Agreement (CLA) declaring that you have the right to, and actually do, grant us
|
||
the rights to use your contribution. For details, visit https://cla.microsoft.com.
|
||
|
||
When you submit a pull request, a CLA-bot will automatically determine whether you need to provide
|
||
a CLA and decorate the PR appropriately (e.g., label, comment). Simply follow the instructions
|
||
provided by the bot. You will only need to do this once across all repos using our CLA.
|