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UnrealEngineUWP/Engine/Source/ThirdParty/mimalloc/docs/using.html
danny couture e6f54c17c4 Update mimalloc to version 2.0.0-2762784 for HUGE memory usage improvement in editor workloads 
This version of mimalloc is very efficient at distributing threaded allocations in a way that maintains
    locality which in turn improve the amount of memory that we're able to send back to the system
    after heavily multithreaded workloads. This also improves performance as less page fault and cache misses
    are expected coming from more densily packed allocations.

    mimalloc v1 seemed to waste more memory because of its commit size being larger than TBB.
    However, its allocation patterns was already way tigther than TBB but for it to become apparent, you had
    to activate the "page_reset" and "reset_decommits" options, which came at a performance loss.

    mimalloc v2 offers both better locality and by default will more agressively decommit memory with
    only minor performance loss in some cases and performance gain in many.

    Given the advantages of mimalloc v2 compared to Intel TBB, we should probably consider it
    as our next default allocator for the editor.

 - All tests performed on AMD TR 3970X with 256GB RAM
   - Loading FramingCameraTest map on special project with -ddc=cold and waiting until every asset is built
     - 699s @ 32GB for tbb malloc
     - 655s @ 37GB for mimalloc v1
     - 757s @ 12GB for mimalloc v1 + page_reset and reset_decommits
     - 604s @ 15GB for mimalloc v2
   - Loading P_World on Reverb -ddc=cold and waiting until every asset is built
     - 2372s @ 71GB for tbb malloc
     - 2587s @ 75GB for mimalloc v1
     - 3212s @ 34GB for mimalloc v1 + page_reset and reset_decommits
     - 2503s @ 37GB for mimalloc v2
   - Loading P_Construct_WP on special project with -ddc=cold and waiting until every asset is built
     - 6404s @ 56GB for tbb malloc
     - 6640s @ 37GB for mimalloc v2
   - Loading Apollo_Terrain on FortniteGame with -ddc=cold and waiting until every asset is built
     - 751s @ 33GB for tbb malloc
     - 744s @ 25GB for mimalloc v2
    - Cooking FramingCameraTest map on special project with a warmed-up DDC
     - 379s @ 34GB for tbb malloc
     - 367s @ 29GB for mimalloc v2

#rb Brandon.Dawson, Yuriy.ODonnell, Stefan.Boberg

[CL 15859558 by danny couture in ue5-main branch]
2021-03-30 06:38:15 -04:00

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<div class="title">Using the library </div> </div>
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<div class="textblock"><h3>Build</h3>
<p>The preferred usage is including <code>&lt;mimalloc.h&gt;</code>, linking with the shared- or static library, and using the <code>mi_malloc</code> API exclusively for allocation. For example, </p><div class="fragment"><div class="line">gcc -o myprogram -lmimalloc myfile.c</div></div><!-- fragment --><p>mimalloc uses only safe OS calls (<code>mmap</code> and <code>VirtualAlloc</code>) and can co-exist with other allocators linked to the same program. If you use <code>cmake</code>, you can simply use: </p><div class="fragment"><div class="line">find_package(mimalloc 1.0 REQUIRED)</div></div><!-- fragment --><p> in your <code>CMakeLists.txt</code> to find a locally installed mimalloc. Then use either: </p><div class="fragment"><div class="line">target_link_libraries(myapp PUBLIC mimalloc)</div></div><!-- fragment --><p> to link with the shared (dynamic) library, or: </p><div class="fragment"><div class="line">target_link_libraries(myapp PUBLIC mimalloc-<span class="keyword">static</span>)</div></div><!-- fragment --><p> to link with the static library. See <code>test\CMakeLists.txt</code> for an example.</p>
<h3>C++</h3>
<p>For best performance in C++ programs, it is also recommended to override the global <code>new</code> and <code>delete</code> operators. For convience, mimalloc provides <a href="https://github.com/microsoft/mimalloc/blob/master/include/mimalloc-new-delete.h"><code>mimalloc-new-delete.h</code></a> which does this for you &ndash; just include it in a single(!) source file in your project.</p>
<p>In C++, mimalloc also provides the <code><a class="el" href="group__cpp.html#structmi__stl__allocator" title="std::allocator implementation for mimalloc for use in STL containers.">mi_stl_allocator</a></code> struct which implements the <code>std::allocator</code> interface. For example: </p><div class="fragment"><div class="line">std::vector&lt;some_struct, mi_stl_allocator&lt;some_struct&gt;&gt; vec;</div><div class="line">vec.push_back(some_struct());</div></div><!-- fragment --><h3>Statistics</h3>
<p>You can pass environment variables to print verbose messages (<code>MIMALLOC_VERBOSE=1</code>) and statistics (<code>MIMALLOC_SHOW_STATS=1</code>) (in the debug version): </p><div class="fragment"><div class="line">&gt; env MIMALLOC_SHOW_STATS=1 ./cfrac 175451865205073170563711388363</div><div class="line"></div><div class="line">175451865205073170563711388363 = 374456281610909315237213 * 468551</div><div class="line"></div><div class="line">heap stats: peak total freed unit</div><div class="line">normal 2: 16.4 kb 17.5 mb 17.5 mb 16 b ok</div><div class="line">normal 3: 16.3 kb 15.2 mb 15.2 mb 24 b ok</div><div class="line">normal 4: 64 b 4.6 kb 4.6 kb 32 b ok</div><div class="line">normal 5: 80 b 118.4 kb 118.4 kb 40 b ok</div><div class="line">normal 6: 48 b 48 b 48 b 48 b ok</div><div class="line">normal 17: 960 b 960 b 960 b 320 b ok</div><div class="line"></div><div class="line">heap stats: peak total freed unit</div><div class="line"> normal: 33.9 kb 32.8 mb 32.8 mb 1 b ok</div><div class="line"> huge: 0 b 0 b 0 b 1 b ok</div><div class="line"> total: 33.9 kb 32.8 mb 32.8 mb 1 b ok</div><div class="line">malloc requested: 32.8 mb</div><div class="line"></div><div class="line"> committed: 58.2 kb 58.2 kb 58.2 kb 1 b ok</div><div class="line"> reserved: 2.0 mb 2.0 mb 2.0 mb 1 b ok</div><div class="line"> reset: 0 b 0 b 0 b 1 b ok</div><div class="line"> segments: 1 1 1</div><div class="line">-abandoned: 0</div><div class="line"> pages: 6 6 6</div><div class="line">-abandoned: 0</div><div class="line"> mmaps: 3</div><div class="line"> mmap fast: 0</div><div class="line"> mmap slow: 1</div><div class="line"> threads: 0</div><div class="line"> elapsed: 2.022s</div><div class="line"> process: user: 1.781s, system: 0.016s, faults: 756, reclaims: 0, rss: 2.7 mb</div></div><!-- fragment --><p>The above model of using the <code>mi_</code> prefixed API is not always possible though in existing programs that already use the standard malloc interface, and another option is to override the standard malloc interface completely and redirect all calls to the <em>mimalloc</em> library instead.</p>
<p>See <a class="el" href="overrides.html">Overriding Malloc</a> for more info. </p>
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