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<h3>
Andreas Klebinger pushed to branch wip/andreask/allocationArea
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
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<h4>
Commits:
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<ul>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/444c1e0e9df29e3323bec9cf5d50fb88c57eaafa">444c1e0e</a></strong>
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<span>by Andreas Klebinger</span>
<i>at 2020-07-13T13:47:58+02:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Increase -A and -O rts defaults to 4MB.
Fixes #16499
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<h4>2 changed files:</h4>
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<a href="#6ae923e173536bf0ddb39552416a7e21767287db">
docs/users_guide/runtime_control.rst
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<li class="file-stats">
<a href="#640fc6f2f536ba83f1694f9a7ef3d43e2d0428d3">
rts/RtsFlags.c
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<h4>Changes:</h4>
<li id="6ae923e173536bf0ddb39552416a7e21767287db">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/444c1e0e9df29e3323bec9cf5d50fb88c57eaafa#6ae923e173536bf0ddb39552416a7e21767287db"><strong>docs/users_guide/runtime_control.rst</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -401,7 +401,7 @@ performance.</td>
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<pre style="margin: 0;"> <span id="LC402" class="line" lang="plaintext">.. rts-flag:: -A ⟨size⟩</span>
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<pre style="margin: 0;">-<span id="LC404" class="line" lang="plaintext"> :default: <span class="idiff left right">1</span>MB</span>
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<pre style="margin: 0;">+<span id="LC404" class="line" lang="plaintext"> :default: <span class="idiff left right">4</span>MB</span>
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<pre style="margin: 0;"> <span id="LC406" class="line" lang="plaintext"> .. index::</span>
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<pre style="margin: 0;"> <span id="LC407" class="line" lang="plaintext"> single: allocation area, size</span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="410" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="diff-line-num unfold js-unfold new_line" data-linenumber="410" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -410,15 +410,22 @@ performance.</td>
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<pre style="margin: 0;"> <span id="LC410" class="line" lang="plaintext"> collector. The allocation area (actually generation 0 step 0) is</span>
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<pre style="margin: 0;"> <span id="LC411" class="line" lang="plaintext"> fixed and is never resized (unless you use :rts-flag:`-H [⟨size⟩]`, below).</span>
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<pre style="margin: 0;"> <span id="LC412" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC413" class="line" lang="plaintext"> Increasing the allocation area size may or may not give better</span>
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<pre style="margin: 0;">-<span id="LC414" class="line" lang="plaintext"> performance (a bigger allocation area means worse cache behaviour</span>
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<pre style="margin: 0;">-<span id="LC415" class="line" lang="plaintext"> but fewer garbage collections and less promotion).</span>
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<pre style="margin: 0;">+<span id="LC413" class="line" lang="plaintext"> Optimal settings depend on the actual machine, program, and other RTS options.</span>
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<pre style="margin: 0;">+<span id="LC414" class="line" lang="plaintext"> Increasing the allocation area size means worse cache behaviour</span>
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<pre style="margin: 0;">+<span id="LC415" class="line" lang="plaintext"> but fewer garbage collections and less promotion.</span>
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<pre style="margin: 0;">+<span id="LC416" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC417" class="line" lang="plaintext"> In general settings >= 4MB can reduce performance in some cases, in particular for single</span>
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<pre style="margin: 0;">+<span id="LC418" class="line" lang="plaintext"> threaded operation. However in a parallel setting increasing the allocation area</span>
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<pre style="margin: 0;">+<span id="LC419" class="line" lang="plaintext"> to ``16MB``, or even ``64MB`` can increase gc throughput significantly.</span>
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<pre style="margin: 0;"> <span id="LC421" class="line" lang="plaintext"> With only 1 generation (e.g. ``-G1``, see :rts-flag:`-G ⟨generations⟩`) the</span>
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<pre style="margin: 0;"> <span id="LC422" class="line" lang="plaintext"> ``-A`` option specifies the minimum allocation area, since the actual size</span>
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<pre style="margin: 0;"> <span id="LC423" class="line" lang="plaintext"> of the allocation area will be resized according to the amount of data in</span>
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<pre style="margin: 0;"> <span id="LC424" class="line" lang="plaintext"> the heap (see :rts-flag:`-F ⟨factor⟩`, below).</span>
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<pre style="margin: 0;"> <span id="LC425" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC426" class="line" lang="plaintext"> When heap profiling using a smaller allocation area can increase accuracy as more frequent</span>
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<pre style="margin: 0;">+<span id="LC427" class="line" lang="plaintext"> major garbage collections also results in more frequent heap snapshots</span>
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<pre style="margin: 0;">+<span id="LC428" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC429" class="line" lang="plaintext">.. rts-flag:: -AL ⟨size⟩</span>
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<pre style="margin: 0;"> <span id="LC430" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC431" class="line" lang="plaintext"> :default: :rts-flag:`-A <-A ⟨size⟩>` value</span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -450,7 +457,7 @@ performance.</td>
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<pre style="margin: 0;"> <span id="LC457" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC458" class="line" lang="plaintext">.. rts-flag:: -O ⟨size⟩</span>
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<pre style="margin: 0;"> <span id="LC459" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC453" class="line" lang="plaintext"> :default: <span class="idiff left right">1</span>m</span>
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<pre style="margin: 0;">+<span id="LC460" class="line" lang="plaintext"> :default: <span class="idiff left right">4</span>m</span>
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<pre style="margin: 0;"> <span id="LC461" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC462" class="line" lang="plaintext"> .. index::</span>
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<pre style="margin: 0;"> <span id="LC463" class="line" lang="plaintext"> single: old generation, size</span>
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<li id="640fc6f2f536ba83f1694f9a7ef3d43e2d0428d3">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/444c1e0e9df29e3323bec9cf5d50fb88c57eaafa#640fc6f2f536ba83f1694f9a7ef3d43e2d0428d3"><strong>rts/RtsFlags.c</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -152,10 +152,11 @@ void initRtsFlagsDefaults(void)</td>
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<pre style="margin: 0;"> <span id="LC152" class="line" lang="c"> <span class="n" style="color: #333;">RtsFlags</span><span class="p">.</span><span class="n" style="color: #333;">GcFlags</span><span class="p">.</span><span class="n" style="color: #333;">stkChunkSize</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="mi" style="color: #099;">32</span> <span class="o" style="font-weight: 600;">*</span> <span class="mi" style="color: #099;">1024</span><span class="p">)</span> <span class="o" style="font-weight: 600;">/</span> <span class="k" style="font-weight: 600;">sizeof</span><span class="p">(</span><span class="n" style="color: #333;">W_</span><span class="p">);</span></span>
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<pre style="margin: 0;"> <span id="LC153" class="line" lang="c"> <span class="n" style="color: #333;">RtsFlags</span><span class="p">.</span><span class="n" style="color: #333;">GcFlags</span><span class="p">.</span><span class="n" style="color: #333;">stkChunkBufferSize</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="mi" style="color: #099;">1</span> <span class="o" style="font-weight: 600;">*</span> <span class="mi" style="color: #099;">1024</span><span class="p">)</span> <span class="o" style="font-weight: 600;">/</span> <span class="k" style="font-weight: 600;">sizeof</span><span class="p">(</span><span class="n" style="color: #333;">W_</span><span class="p">);</span></span>
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<pre style="margin: 0;"> <span id="LC154" class="line" lang="c"></span>
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<pre style="margin: 0;">-<span id="LC155" class="line" lang="c"> <span class="n" style="color: #333;">RtsFlags</span><span class="p">.</span><span class="n" style="color: #333;">GcFlags</span><span class="p">.</span><span class="n" style="color: #333;">minAllocAreaSize</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="mi" style="color: #099;">1024</span> <span class="o" style="font-weight: 600;">*</span> <span class="mi" style="color: #099;">1024</span><span class="p">)</span> <span class="o" style="font-weight: 600;">/</span> <span class="n" style="color: #333;">BLOCK_SIZE</span><span class="p">;</span></span>
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<td class="diff-line-num new new_line" data-linenumber="155" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
155
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<pre style="margin: 0;">+<span id="LC155" class="line" lang="c"> <span class="cm" style="color: #998; font-style: italic;">/* -A default. See #16499 for a discussion about the tradeoffs */</span></span>
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<td class="diff-line-num new old_line" data-linenumber="156" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<td class="diff-line-num new new_line" data-linenumber="156" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
156
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<pre style="margin: 0;">+<span id="LC156" class="line" lang="c"> <span class="n" style="color: #333;">RtsFlags</span><span class="p">.</span><span class="n" style="color: #333;">GcFlags</span><span class="p">.</span><span class="n" style="color: #333;">minAllocAreaSize</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="mi" style="color: #099;">4</span> <span class="o" style="font-weight: 600;">*</span> <span class="mi" style="color: #099;">1024</span> <span class="o" style="font-weight: 600;">*</span> <span class="mi" style="color: #099;">1024</span><span class="p">)</span> <span class="o" style="font-weight: 600;">/</span> <span class="n" style="color: #333;">BLOCK_SIZE</span><span class="p">;</span></span>
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156
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<td class="diff-line-num new_line" data-linenumber="157" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
157
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<pre style="margin: 0;"> <span id="LC157" class="line" lang="c"> <span class="n" style="color: #333;">RtsFlags</span><span class="p">.</span><span class="n" style="color: #333;">GcFlags</span><span class="p">.</span><span class="n" style="color: #333;">largeAllocLim</span> <span class="o" style="font-weight: 600;">=</span> <span class="mi" style="color: #099;">0</span><span class="p">;</span> <span class="cm" style="color: #998; font-style: italic;">/* defaults to minAllocAreasize */</span></span>
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157
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158
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<pre style="margin: 0;"> <span id="LC158" class="line" lang="c"> <span class="n" style="color: #333;">RtsFlags</span><span class="p">.</span><span class="n" style="color: #333;">GcFlags</span><span class="p">.</span><span class="n" style="color: #333;">nurseryChunkSize</span> <span class="o" style="font-weight: 600;">=</span> <span class="mi" style="color: #099;">0</span><span class="p">;</span></span>
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158
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<td class="diff-line-num new_line old" data-linenumber="159" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC158" class="line" lang="c"> <span class="n" style="color: #333;">RtsFlags</span><span class="p">.</span><span class="n" style="color: #333;">GcFlags</span><span class="p">.</span><span class="n" style="color: #333;">minOldGenSize</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="mi" style="color: #099;"><span class="idiff left">1024</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">*</span></span><span class="idiff"> </span><span class="mi" style="color: #099;"><span class="idiff">1024</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">/</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">BLOCK_SIZE</span></span><span class="p"><span class="idiff right">;</span></span></span>
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<td class="diff-line-num new old_line" data-linenumber="159" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<td class="diff-line-num new new_line" data-linenumber="159" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
159
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<pre style="margin: 0;">+<span id="LC159" class="line" lang="c"> <span class="n" style="color: #333;">RtsFlags</span><span class="p">.</span><span class="n" style="color: #333;">GcFlags</span><span class="p">.</span><span class="n" style="color: #333;">minOldGenSize</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="mi" style="color: #099;"><span class="idiff left">4</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">*</span></span><span class="idiff"> </span><span class="mi" style="color: #099;"><span class="idiff">1024</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">*</span></span><span class="idiff"> </span><span class="mi" style="color: #099;"><span class="idiff">1024</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">/</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">BLOCK_SIZE</span></span><span class="p"><span class="idiff">;</span></span><span class="idiff"> </span><span class="cm" style="color: #998; font-style: italic;"><span class="idiff right">/* -O default */</span></span></span>
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159
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<td class="diff-line-num new_line" data-linenumber="160" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
160
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<pre style="margin: 0;"> <span id="LC160" class="line" lang="c"> <span class="n" style="color: #333;">RtsFlags</span><span class="p">.</span><span class="n" style="color: #333;">GcFlags</span><span class="p">.</span><span class="n" style="color: #333;">maxHeapSize</span> <span class="o" style="font-weight: 600;">=</span> <span class="mi" style="color: #099;">0</span><span class="p">;</span> <span class="cm" style="color: #998; font-style: italic;">/* off by default */</span></span>
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160
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161
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<pre style="margin: 0;"> <span id="LC161" class="line" lang="c"> <span class="n" style="color: #333;">RtsFlags</span><span class="p">.</span><span class="n" style="color: #333;">GcFlags</span><span class="p">.</span><span class="n" style="color: #333;">heapLimitGrace</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="mi" style="color: #099;">1024</span> <span class="o" style="font-weight: 600;">*</span> <span class="mi" style="color: #099;">1024</span><span class="p">);</span></span>
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161
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<td class="diff-line-num new_line" data-linenumber="162" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
162
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<pre style="margin: 0;"> <span id="LC162" class="line" lang="c"> <span class="n" style="color: #333;">RtsFlags</span><span class="p">.</span><span class="n" style="color: #333;">GcFlags</span><span class="p">.</span><span class="n" style="color: #333;">heapSizeSuggestion</span> <span class="o" style="font-weight: 600;">=</span> <span class="mi" style="color: #099;">0</span><span class="p">;</span> <span class="cm" style="color: #998; font-style: italic;">/* none */</span></span>
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