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<h3>
Andreas Klebinger pushed to branch wip/andreask/large_address_space
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
</h3>
<h4>
Commits:
</h4>
<ul>
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<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/db133589ad7fdd2d5c34a46853108db7fc261b17">db133589</a></strong>
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<span>by Andreas Klebinger</span>
<i>at 2020-06-17T22:09:31+02:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Enable large address space optimization on windows.
Starting with Win 8.1/Server 2012 windows no longer preallocates
page tables for reserverd memory eagerly, which prevented us from
using this approach in the past.
We also try to allocate the heap high in the memory space.
Hopefully this makes it easier to allocate things in the low
4GB of memory that need to be there. Like jump islands for the
linker.
</pre>
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<h4>3 changed files:</h4>
<ul>
<li class="file-stats">
<a href="#87db583be5c13c1f7b3c958b10e03d67b6a2ca06">
configure.ac
</a>
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<li class="file-stats">
<a href="#b421960e854c6cfa1e4ca830bd6a5fc6eef91168">
docs/users_guide/8.12.1-notes.rst
</a>
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<li class="file-stats">
<a href="#20d64c0bdc272817149d1d5cf20a73a8b5fd637f">
rts/win32/OSMem.c
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<h4>Changes:</h4>
<li id="87db583be5c13c1f7b3c958b10e03d67b6a2ca06">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/db133589ad7fdd2d5c34a46853108db7fc261b17#87db583be5c13c1f7b3c958b10e03d67b6a2ca06"><strong>configure.ac</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">@@ -1217,11 +1217,15 @@ if test "$ac_cv_sizeof_void_p" -eq 8 ; then</td>
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<pre style="margin: 0;"> <span id="LC1217" class="line" lang="plaintext"> if test "x$EnableLargeAddressSpace" = "xyes" ; then</span>
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<pre style="margin: 0;"> <span id="LC1218" class="line" lang="plaintext"> if test "$ghc_host_os" = "darwin" ; then</span>
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<pre style="margin: 0;"> <span id="LC1219" class="line" lang="plaintext"> use_large_address_space=yes</span>
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<pre style="margin: 0;">-<span id="LC1220" class="line" lang="plaintext"> elif test "$ghc_host_os" = "openbsd" ; then</span>
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<pre style="margin: 0;">-<span id="LC1221" class="line" lang="plaintext"> # as of OpenBSD 5.8 (2015), OpenBSD does not support mmap with MAP_NORESERVE.</span>
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<pre style="margin: 0;">-<span id="LC1222" class="line" lang="plaintext"> # The flag MAP_NORESERVE is supported for source compatibility reasons,</span>
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<pre style="margin: 0;">-<span id="LC1223" class="line" lang="plaintext"> # but is completely ignored by OS mmap</span>
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<pre style="margin: 0;">-<span id="LC1224" class="line" lang="plaintext"> use_large_address_space=no</span>
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<pre style="margin: 0;">+<span id="LC1220" class="line" lang="plaintext"> elif test "$ghc_host_os" = "openbsd" ; then</span>
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<pre style="margin: 0;">+<span id="LC1221" class="line" lang="plaintext"> # as of OpenBSD 5.8 (2015), OpenBSD does not support mmap with MAP_NORESERVE.</span>
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<pre style="margin: 0;">+<span id="LC1222" class="line" lang="plaintext"> # The flag MAP_NORESERVE is supported for source compatibility reasons,</span>
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<pre style="margin: 0;">+<span id="LC1223" class="line" lang="plaintext"> # but is completely ignored by OS mmap</span>
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<pre style="margin: 0;">+<span id="LC1224" class="line" lang="plaintext"> use_large_address_space=no</span>
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<pre style="margin: 0;">+<span id="LC1225" class="line" lang="plaintext"> elif test "$ghc_host_os" = "mingw32" ; then</span>
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<td class="diff-line-num new new_line" data-linenumber="1226" 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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<pre style="margin: 0;">+<span id="LC1226" class="line" lang="plaintext"> # as of Windows 8.1/Server 2012 windows does no longer allocate the page</span>
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<pre style="margin: 0;">+<span id="LC1227" class="line" lang="plaintext"> # tabe for reserved memory eagerly. So we are now free to use LAS there too.</span>
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<pre style="margin: 0;">+<span id="LC1228" class="line" lang="plaintext"> use_large_address_space=yes</span>
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<pre style="margin: 0;"> <span id="LC1229" class="line" lang="plaintext"> else</span>
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<pre style="margin: 0;"> <span id="LC1230" class="line" lang="plaintext"> AC_CHECK_DECLS([MAP_NORESERVE, MADV_FREE, MADV_DONTNEED],[],[],</span>
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<pre style="margin: 0;"> <span id="LC1231" class="line" lang="plaintext"> [</span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/db133589ad7fdd2d5c34a46853108db7fc261b17#b421960e854c6cfa1e4ca830bd6a5fc6eef91168"><strong>docs/users_guide/8.12.1-notes.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">@@ -21,11 +21,11 @@ Highlights</td>
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<pre style="margin: 0;"> <span id="LC21" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC22" class="line" lang="plaintext">* Pattern-Match Coverage Checking</span>
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<pre style="margin: 0;"> <span id="LC23" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC24" class="line" lang="plaintext"> - The revamp of the pattern-match coverage checker that started in 8.10 concludes with this release and implements the<span class="idiff left right"> </span></span>
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<pre style="margin: 0;">+<span id="LC24" class="line" lang="plaintext"> - The revamp of the pattern-match coverage checker that started in 8.10 concludes with this release and implements the</span>
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<pre style="margin: 0;"> <span id="LC25" class="line" lang="plaintext"> novel `*Lower Your Guards* <https://www.microsoft.com/en-us/research/uploads/prod/2020/03/lyg.pdf>`_ algorithm.</span>
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<pre style="margin: 0;"> <span id="LC26" class="line" lang="plaintext"> - Compared to 8.10, end users might notice improvements to "long-distance information": :: haskell</span>
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<pre style="margin: 0;"> <span id="LC27" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC28" class="line" lang="plaintext"> :linenos:<span class="idiff left right"> </span></span>
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<pre style="margin: 0;">+<span id="LC28" class="line" lang="plaintext"> :linenos:</span>
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<pre style="margin: 0;"> <span id="LC29" class="line" lang="plaintext"> f True = 1</span>
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<pre style="margin: 0;"> <span id="LC30" class="line" lang="plaintext"> f x = ... case x of { False -> 2; True -> 3 } ...</span>
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<pre style="margin: 0;"> <span id="LC31" class="line" lang="plaintext"></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">@@ -158,6 +158,12 @@ Runtime system</td>
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<pre style="margin: 0;"> <span id="LC158" class="line" lang="plaintext">- Support for Windows Vista has been dropped. GHC-compiled programs now require</span>
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<pre style="margin: 0;"> <span id="LC159" class="line" lang="plaintext"> Windows 7 or later.</span>
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<pre style="margin: 0;"> <span id="LC160" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC161" class="line" lang="plaintext">- Windows now uses the large address space allocator by default.</span>
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<pre style="margin: 0;">+<span id="LC162" class="line" lang="plaintext"> In extreme cases we saw improvements by up to 3% decreased runtime.</span>
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<pre style="margin: 0;">+<span id="LC163" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC164" class="line" lang="plaintext"> The downside is that haskell apps run on older (Pre Win-8.1/Server 2012)</span>
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<pre style="margin: 0;">+<span id="LC165" class="line" lang="plaintext"> systems will have higher memory footprints.</span>
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<pre style="margin: 0;">+<span id="LC166" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC167" class="line" lang="plaintext">Template Haskell</span>
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<pre style="margin: 0;"> <span id="LC168" class="line" lang="plaintext">~~~~~~~~~~~~~~~~</span>
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<pre style="margin: 0;"> <span id="LC169" class="line" lang="plaintext"></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/db133589ad7fdd2d5c34a46853108db7fc261b17#20d64c0bdc272817149d1d5cf20a73a8b5fd637f"><strong>rts/win32/OSMem.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">@@ -459,7 +459,7 @@ void *osReserveHeapMemory (void *startAddress, W_ *len)</td>
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<pre style="margin: 0;"> <span id="LC459" class="line" lang="c"> <span class="kt" style="color: #458; font-weight: 600;">void</span> <span class="o" style="font-weight: 600;">*</span><span class="n" style="color: #333;">start</span><span class="p">;</span></span>
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<pre style="margin: 0;"> <span id="LC460" class="line" lang="c"></span>
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<pre style="margin: 0;"> <span id="LC461" class="line" lang="c"> <span class="n" style="color: #333;">heap_base</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">VirtualAlloc</span><span class="p">(</span><span class="n" style="color: #333;">startAddress</span><span class="p">,</span> <span class="o" style="font-weight: 600;">*</span><span class="n" style="color: #333;">len</span> <span class="o" style="font-weight: 600;">+</span> <span class="n" style="color: #333;">MBLOCK_SIZE</span><span class="p">,</span></span>
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<pre style="margin: 0;">-<span id="LC462" class="line" lang="c"> <span class="n" style="color: #333;">MEM_RESERVE</span><span class="p">,</span> <span class="n" style="color: #333;">PAGE_READWRITE</span><span class="p">);</span></span>
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<pre style="margin: 0;">+<span id="LC462" class="line" lang="c"> <span class="n" style="color: #333;">MEM_RESERVE</span><span class="idiff left"> </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 right">MEM_TOP_DOWN</span></span><span class="p">,</span> <span class="n" style="color: #333;">PAGE_READWRITE</span><span class="p">);</span></span>
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<pre style="margin: 0;"> <span id="LC463" class="line" lang="c"> <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="n" style="color: #333;">heap_base</span> <span class="o" style="font-weight: 600;">==</span> <span class="nb" style="color: #0086b3;">NULL</span><span class="p">)</span> <span class="p">{</span></span>
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<pre style="margin: 0;"> <span id="LC464" class="line" lang="c"> <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="n" style="color: #333;">GetLastError</span><span class="p">()</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">ERROR_NOT_ENOUGH_MEMORY</span><span class="p">)</span> <span class="p">{</span></span>
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<pre style="margin: 0;"> <span id="LC465" class="line" lang="c"> <span class="n" style="color: #333;">errorBelch</span><span class="p">(</span><span class="s" style="color: #d14;">"out of memory"</span><span class="p">);</span></span>
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