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UnrealEngineUWP/Engine/Source/ThirdParty/mimalloc/docs/group__options.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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<p>Set runtime behavior.
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<tr class="memitem:gaebf6ff707a2e688ebb1a2296ca564054"><td class="memItemLeft" align="right" valign="top">void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__options.html#gaebf6ff707a2e688ebb1a2296ca564054">mi_option_disable</a> (<a class="el" href="group__options.html#gafebf7ed116adb38ae5218bc3ce06884c">mi_option_t</a> option)</td></tr>
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<tr class="memitem:ga7ef623e440e6e5545cb08c94e71e4b90"><td class="memItemLeft" align="right" valign="top">void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__options.html#ga7ef623e440e6e5545cb08c94e71e4b90">mi_option_set_default</a> (<a class="el" href="group__options.html#gafebf7ed116adb38ae5218bc3ce06884c">mi_option_t</a> option, long value)</td></tr>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<p>Set runtime behavior. </p>
<h2 class="groupheader">Enumeration Type Documentation</h2>
<a id="gafebf7ed116adb38ae5218bc3ce06884c"></a>
<h2 class="memtitle"><span class="permalink"><a href="#gafebf7ed116adb38ae5218bc3ce06884c">&#9670;&nbsp;</a></span>mi_option_t</h2>
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname">enum <a class="el" href="group__options.html#gafebf7ed116adb38ae5218bc3ce06884c">mi_option_t</a></td>
</tr>
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</div><div class="memdoc">
<p>Runtime options. </p>
<table class="fieldtable">
<tr><th colspan="2">Enumerator</th></tr><tr><td class="fieldname"><a id="ggafebf7ed116adb38ae5218bc3ce06884cafbf4822e5c00732c5984b32a032837f0"></a>mi_option_show_errors&#160;</td><td class="fielddoc"><p>Print error messages to <code>stderr</code>. </p>
</td></tr>
<tr><td class="fieldname"><a id="ggafebf7ed116adb38ae5218bc3ce06884ca0957ef73b2550764b4840edf48422fda"></a>mi_option_show_stats&#160;</td><td class="fielddoc"><p>Print statistics to <code>stderr</code> when the program is done. </p>
</td></tr>
<tr><td class="fieldname"><a id="ggafebf7ed116adb38ae5218bc3ce06884ca7c8b7bf5281c581bad64f5daa6442777"></a>mi_option_verbose&#160;</td><td class="fielddoc"><p>Print verbose messages to <code>stderr</code>. </p>
</td></tr>
<tr><td class="fieldname"><a id="ggafebf7ed116adb38ae5218bc3ce06884ca1e8de72c93da7ff22d91e1e27b52ac2b"></a>mi_option_eager_commit&#160;</td><td class="fielddoc"><p>Eagerly commit segments (4MiB) (enabled by default). </p>
</td></tr>
<tr><td class="fieldname"><a id="ggafebf7ed116adb38ae5218bc3ce06884ca32ce97ece29f69e82579679cf8a307ad"></a>mi_option_eager_region_commit&#160;</td><td class="fielddoc"><p>Eagerly commit large (256MiB) memory regions (enabled by default, except on Windows) </p>
</td></tr>
<tr><td class="fieldname"><a id="ggafebf7ed116adb38ae5218bc3ce06884ca4192d491200d0055df0554d4cf65054e"></a>mi_option_large_os_pages&#160;</td><td class="fielddoc"><p>Use large OS pages (2MiB in size) if possible. </p>
</td></tr>
<tr><td class="fieldname"><a id="ggafebf7ed116adb38ae5218bc3ce06884caca7ed041be3b0b9d0b82432c7bf41af2"></a>mi_option_reserve_huge_os_pages&#160;</td><td class="fielddoc"><p>The number of huge OS pages (1GiB in size) to reserve at the start of the program. </p>
</td></tr>
<tr><td class="fieldname"><a id="ggafebf7ed116adb38ae5218bc3ce06884ca2ecbe7ef32f5c84de3739aa4f0b805a1"></a>mi_option_segment_cache&#160;</td><td class="fielddoc"><p>The number of segments per thread to keep cached. </p>
</td></tr>
<tr><td class="fieldname"><a id="ggafebf7ed116adb38ae5218bc3ce06884cada854dd272c66342f18a93ee254a2968"></a>mi_option_page_reset&#160;</td><td class="fielddoc"><p>Reset page memory after <em>mi_option_reset_delay</em> milliseconds when it becomes free. </p>
</td></tr>
<tr><td class="fieldname"><a id="ggafebf7ed116adb38ae5218bc3ce06884cafb121d30d87591850d5410ccc3a95c6d"></a>mi_option_segment_reset&#160;</td><td class="fielddoc"><p>Experimental. </p>
</td></tr>
<tr><td class="fieldname"><a id="ggafebf7ed116adb38ae5218bc3ce06884ca154fe170131d5212cff57e22b99523c5"></a>mi_option_reset_delay&#160;</td><td class="fielddoc"><p>Delay in milli-seconds before resetting a page (100ms by default) </p>
</td></tr>
<tr><td class="fieldname"><a id="ggafebf7ed116adb38ae5218bc3ce06884ca0ac33a18f6b659fcfaf44efb0bab1b74"></a>mi_option_use_numa_nodes&#160;</td><td class="fielddoc"><p>Pretend there are at most N NUMA nodes. </p>
</td></tr>
<tr><td class="fieldname"><a id="ggafebf7ed116adb38ae5218bc3ce06884cac81ee965b130fa81238913a3c239d536"></a>mi_option_reset_decommits&#160;</td><td class="fielddoc"><p>Experimental. </p>
</td></tr>
<tr><td class="fieldname"><a id="ggafebf7ed116adb38ae5218bc3ce06884ca17a190c25be381142d87e0468c4c068c"></a>mi_option_eager_commit_delay&#160;</td><td class="fielddoc"><p>Experimental. </p>
</td></tr>
<tr><td class="fieldname"><a id="ggafebf7ed116adb38ae5218bc3ce06884ca4b74ae2a69e445de6c2361b73c1d14bf"></a>mi_option_os_tag&#160;</td><td class="fielddoc"><p>OS tag to assign to mimalloc'd memory. </p>
</td></tr>
<tr><td class="fieldname"><a id="ggafebf7ed116adb38ae5218bc3ce06884ca5b4357b74be0d87568036c32eb1a2e4a"></a>_mi_option_last&#160;</td><td class="fielddoc"></td></tr>
</table>
</div>
</div>
<h2 class="groupheader">Function Documentation</h2>
<a id="gaebf6ff707a2e688ebb1a2296ca564054"></a>
<h2 class="memtitle"><span class="permalink"><a href="#gaebf6ff707a2e688ebb1a2296ca564054">&#9670;&nbsp;</a></span>mi_option_disable()</h2>
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname">void mi_option_disable </td>
<td>(</td>
<td class="paramtype"><a class="el" href="group__options.html#gafebf7ed116adb38ae5218bc3ce06884c">mi_option_t</a>&#160;</td>
<td class="paramname"><em>option</em></td><td>)</td>
<td></td>
</tr>
</table>
</div><div class="memdoc">
</div>
</div>
<a id="ga04180ae41b0d601421dd62ced40ca050"></a>
<h2 class="memtitle"><span class="permalink"><a href="#ga04180ae41b0d601421dd62ced40ca050">&#9670;&nbsp;</a></span>mi_option_enable()</h2>
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname">void mi_option_enable </td>
<td>(</td>
<td class="paramtype"><a class="el" href="group__options.html#gafebf7ed116adb38ae5218bc3ce06884c">mi_option_t</a>&#160;</td>
<td class="paramname"><em>option</em></td><td>)</td>
<td></td>
</tr>
</table>
</div><div class="memdoc">
</div>
</div>
<a id="ga7e8af195cc81d3fa64ccf2662caa565a"></a>
<h2 class="memtitle"><span class="permalink"><a href="#ga7e8af195cc81d3fa64ccf2662caa565a">&#9670;&nbsp;</a></span>mi_option_get()</h2>
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname">long mi_option_get </td>
<td>(</td>
<td class="paramtype"><a class="el" href="group__options.html#gafebf7ed116adb38ae5218bc3ce06884c">mi_option_t</a>&#160;</td>
<td class="paramname"><em>option</em></td><td>)</td>
<td></td>
</tr>
</table>
</div><div class="memdoc">
</div>
</div>
<a id="ga459ad98f18b3fc9275474807fe0ca188"></a>
<h2 class="memtitle"><span class="permalink"><a href="#ga459ad98f18b3fc9275474807fe0ca188">&#9670;&nbsp;</a></span>mi_option_is_enabled()</h2>
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<td class="memname">bool mi_option_is_enabled </td>
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<td class="paramtype"><a class="el" href="group__options.html#gafebf7ed116adb38ae5218bc3ce06884c">mi_option_t</a>&#160;</td>
<td class="paramname"><em>option</em></td><td>)</td>
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<h2 class="memtitle"><span class="permalink"><a href="#gaf84921c32375e25754dc2ee6a911fa60">&#9670;&nbsp;</a></span>mi_option_set()</h2>
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<td class="memname">void mi_option_set </td>
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<td class="paramtype"><a class="el" href="group__options.html#gafebf7ed116adb38ae5218bc3ce06884c">mi_option_t</a>&#160;</td>
<td class="paramname"><em>option</em>, </td>
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<td class="paramtype">long&#160;</td>
<td class="paramname"><em>value</em>&#160;</td>
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<td>)</td>
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<h2 class="memtitle"><span class="permalink"><a href="#ga7ef623e440e6e5545cb08c94e71e4b90">&#9670;&nbsp;</a></span>mi_option_set_default()</h2>
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<td class="memname">void mi_option_set_default </td>
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<td class="paramtype"><a class="el" href="group__options.html#gafebf7ed116adb38ae5218bc3ce06884c">mi_option_t</a>&#160;</td>
<td class="paramname"><em>option</em>, </td>
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<td class="paramtype">long&#160;</td>
<td class="paramname"><em>value</em>&#160;</td>
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<td>)</td>
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<h2 class="memtitle"><span class="permalink"><a href="#ga9a13d05fcb77489cb06d4d017ebd8bed">&#9670;&nbsp;</a></span>mi_option_set_enabled()</h2>
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<td class="memname">void mi_option_set_enabled </td>
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<td class="paramtype"><a class="el" href="group__options.html#gafebf7ed116adb38ae5218bc3ce06884c">mi_option_t</a>&#160;</td>
<td class="paramname"><em>option</em>, </td>
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<td class="paramtype">bool&#160;</td>
<td class="paramname"><em>enable</em>&#160;</td>
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<td>)</td>
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<h2 class="memtitle"><span class="permalink"><a href="#ga65518b69ec5d32336b50e07f74b3f629">&#9670;&nbsp;</a></span>mi_option_set_enabled_default()</h2>
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<td class="memname">void mi_option_set_enabled_default </td>
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<td class="paramtype"><a class="el" href="group__options.html#gafebf7ed116adb38ae5218bc3ce06884c">mi_option_t</a>&#160;</td>
<td class="paramname"><em>option</em>, </td>
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<td class="paramtype">bool&#160;</td>
<td class="paramname"><em>enable</em>&#160;</td>
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<td>)</td>
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