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Update manual for opt.retain (new default on Windows).

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Qi Wang 2019-07-25 13:43:59 -07:00 committed by Qi Wang
parent 10fcff6c38
commit 9f6a9f4c1f
1 changed files with 11 additions and 11 deletions
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doc/jemalloc.xml.in
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@ -963,17 +963,17 @@ mallctl("arena." STRINGIFY(MALLCTL_ARENAS_ALL) ".decay",
linkend="stats.retained">stats.retained</link> for related details).
It also makes jemalloc use <citerefentry>
<refentrytitle>mmap</refentrytitle><manvolnum>2</manvolnum>
</citerefentry> in a more greedy way, mapping larger chunks in one go.
This option is disabled by default unless discarding virtual memory is
known to trigger
platform-specific performance problems, e.g. for [64-bit] Linux, which
has a quirk in its virtual memory allocation algorithm that causes
semi-permanent VM map holes under normal jemalloc operation. Although
<citerefentry><refentrytitle>munmap</refentrytitle>
<manvolnum>2</manvolnum></citerefentry> causes issues on 32-bit Linux as
well, retaining virtual memory for 32-bit Linux is disabled by default
due to the practical possibility of address space exhaustion.
</para></listitem>
</citerefentry> or equivalent in a more greedy way, mapping larger
chunks in one go. This option is disabled by default unless discarding
virtual memory is known to trigger platform-specific performance
problems, namely 1) for [64-bit] Linux, which has a quirk in its virtual
memory allocation algorithm that causes semi-permanent VM map holes
under normal jemalloc operation; and 2) for [64-bit] Windows, which
disallows split / merged regions with
<parameter><constant>MEM_RELEASE</constant></parameter>. Although the
same issues may present on 32-bit platforms as well, retaining virtual
memory for 32-bit Linux and Windows is disabled by default due to the
practical possibility of address space exhaustion. </para></listitem>
</varlistentry>
<varlistentry id="opt.dss">