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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>
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<h4>
Commits:
</h4>
<ul>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c5dfc76e084225fc305c130b9c85069ee087e6ed">c5dfc76e</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-04-06T20:00:58+02:00</i>
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<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.
</pre>
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<h4>2 changed files:</h4>
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<li class="file-stats">
<a href="#87db583be5c13c1f7b3c958b10e03d67b6a2ca06">
configure.ac
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<li class="file-stats">
<a href="#b421960e854c6cfa1e4ca830bd6a5fc6eef91168">
docs/users_guide/8.12.1-notes.rst
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<h4>Changes:</h4>
<li id="87db583be5c13c1f7b3c958b10e03d67b6a2ca06">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c5dfc76e084225fc305c130b9c85069ee087e6ed#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">@@ -1203,11 +1203,15 @@ if test "$ac_cv_sizeof_void_p" -eq 8 ; then</td>
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<pre style="margin: 0;"> <span id="LC1203" class="line" lang="plaintext"> if test "x$EnableLargeAddressSpace" = "xyes" ; then</span>
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<pre style="margin: 0;"> <span id="LC1204" class="line" lang="plaintext"> if test "$ghc_host_os" = "darwin" ; then</span>
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<pre style="margin: 0;"> <span id="LC1205" class="line" lang="plaintext"> use_large_address_space=yes</span>
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<pre style="margin: 0;">-<span id="LC1206" class="line" lang="plaintext"> elif test "$ghc_host_os" = "openbsd" ; then</span>
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<pre style="margin: 0;">-<span id="LC1207" 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="LC1208" 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="LC1209" class="line" lang="plaintext"> # but is completely ignored by OS mmap</span>
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<pre style="margin: 0;">-<span id="LC1210" class="line" lang="plaintext"> use_large_address_space=no</span>
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<pre style="margin: 0;">+<span id="LC1206" class="line" lang="plaintext"> elif test "$ghc_host_os" = "openbsd" ; then</span>
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<pre style="margin: 0;">+<span id="LC1207" class="line" lang="plaintext"> # as of OpenBSD 5.8 (2015), OpenBSD does not support mmap with MAP_NORESERVE.</span>
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<pre style="margin: 0;">+<span id="LC1208" class="line" lang="plaintext"> # The flag MAP_NORESERVE is supported for source compatibility reasons,</span>
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<pre style="margin: 0;">+<span id="LC1209" class="line" lang="plaintext"> # but is completely ignored by OS mmap</span>
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<pre style="margin: 0;">+<span id="LC1210" class="line" lang="plaintext"> use_large_address_space=no</span>
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<pre style="margin: 0;">+<span id="LC1211" class="line" lang="plaintext"> elif test "$ghc_host_os" = "mingw32" ; then</span>
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<pre style="margin: 0;">+<span id="LC1212" 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="LC1213" 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="LC1214" class="line" lang="plaintext"> use_large_address_space=yes</span>
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<pre style="margin: 0;"> <span id="LC1215" class="line" lang="plaintext"> else</span>
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<pre style="margin: 0;"> <span id="LC1216" class="line" lang="plaintext"> AC_CHECK_DECLS([MAP_NORESERVE, MADV_FREE, MADV_DONTNEED],[],[],</span>
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<pre style="margin: 0;"> <span id="LC1217" class="line" lang="plaintext"> [</span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c5dfc76e084225fc305c130b9c85069ee087e6ed#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">@@ -40,7 +40,7 @@ Language</td>
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<pre style="margin: 0;"> <span id="LC40" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC41" class="line" lang="plaintext"> There is a chance we will tweak the lookup scheme in the future, to make this</span>
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<pre style="margin: 0;"> <span id="LC42" class="line" lang="plaintext"> workaround unnecessary.</span>
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<pre style="margin: 0;">-<span id="LC43" class="line" lang="plaintext"><span class="idiff left right"> </span></span>
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<pre style="margin: 0;">+<span id="LC43" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC44" class="line" lang="plaintext">Compiler</span>
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<pre style="margin: 0;"> <span id="LC45" class="line" lang="plaintext">~~~~~~~~</span>
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<pre style="margin: 0;"> <span id="LC46" 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">@@ -52,6 +52,9 @@ GHCi</td>
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<pre style="margin: 0;"> <span id="LC52" class="line" lang="plaintext">Runtime system</span>
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<pre style="margin: 0;"> <span id="LC53" class="line" lang="plaintext">~~~~~~~~~~~~~~</span>
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<pre style="margin: 0;"> <span id="LC54" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC55" 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="LC56" 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="LC57" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC58" class="line" lang="plaintext">Template Haskell</span>
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<pre style="margin: 0;"> <span id="LC59" class="line" lang="plaintext">~~~~~~~~~~~~~~~~</span>
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<pre style="margin: 0;"> <span id="LC60" class="line" lang="plaintext"></span>
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