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authorRickard Green <[email protected]>2013-09-10 15:33:33 +0200
committerSverker Eriksson <[email protected]>2013-09-30 17:45:46 +0200
commitffbd1fe3fe4fdd1657f98d650eb3b40139e4b115 (patch)
tree8b0309ed6e7ef539a7078f28f6e68a816b2404b5 /erts/doc/src
parentc8f87b4ec91b67c9d3373c8466a07db638e32cc2 (diff)
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erts: Add documentation for +MMsc* system flags
Diffstat (limited to 'erts/doc/src')
-rw-r--r--erts/doc/src/erts_alloc.xml59
1 files changed, 59 insertions, 0 deletions
diff --git a/erts/doc/src/erts_alloc.xml b/erts/doc/src/erts_alloc.xml
index 6ce2261430..9dab5b3876 100644
--- a/erts/doc/src/erts_alloc.xml
+++ b/erts/doc/src/erts_alloc.xml
@@ -271,6 +271,65 @@
memory segment cache is not reused if its size exceeds the
requested size with more than relative max cache bad fit
percent of the requested size. Default value is 20.</item>
+ <tag><marker id="MMscmgc"><c><![CDATA[+MMscmgc <amount>]]></c></marker></tag>
+ <item>
+ Set <seealso marker="#MMscs">super carrier</seealso> max guaranteed
+ no of carriers. This parameter defaults to <c>65536</c>. This
+ parameter determines an amount of pre-allocated structures that is
+ needed in order to keep track of different areas in the super carrier.
+ When the system runs out of such structures it may crash due to an
+ out of memory condition.
+ </item>
+ <tag><marker id="MMsco"><c><![CDATA[+MMsco true|false]]></c></marker></tag>
+ <item>
+ Set <seealso marker="#MMscs">super carrier</seealso> only flag. This
+ flag defaults to <c>true</c>. When a super carrier is used and this
+ flag is <c>true</c>, the system will crash when a carrier request
+ cannot be satisfied by the super carrier. When the flag is <c>false</c>
+ the system will try to create requested carrier by other means.
+ <br/><br/>
+ <em>NOTE</em>: Setting this flag to <c>false</c> may not be supported
+ on all systems. This flag will in that case be ignored.
+ <br/><br/>
+ <em>NOTE</em>: The super carrier cannot be enabled nor
+ disabled on halfword heap systems. This flag will be
+ ignored on halfword heap systems.
+ </item>
+ <tag><marker id="MMscrpm"><c><![CDATA[+MMscrpm true|false]]></c></marker></tag>
+ <item>
+ Set <seealso marker="#MMscs">super carrier</seealso> reserve physical
+ memory flag. This flag defaults to <c>true</c>. When this flag is
+ <c>true</c>, physical memory will be reserved for the whole super
+ carrier at once when it is created. The reservation will after that
+ be left unchanged. When this flag is set to <c>false</c> only virtual
+ address space will be reserved for the super carrier upon creation.
+ The system will attempt to reserve physical memory upon carrier
+ creations in the super carrier, and attempt to unreserve physical
+ memory upon carrier destructions in the super carrier.
+ <br/><br/>
+ <em>NOTE</em>: What reservation of physical memory actually means
+ highly depends on the operating system, and how it is configured. For
+ example, different memory overcommit settings on Linux drastically
+ change the behaviour. Also note, setting this flag to <c>false</c>
+ may not be supported on all systems. This flag will in that case
+ be ignored.
+ <br/><br/>
+ <em>NOTE</em>: The super carrier cannot be enabled nor
+ disabled on halfword heap systems. This flag will be
+ ignored on halfword heap systems.
+ </item>
+ <tag><marker id="MMscs"><c><![CDATA[+MMscs <size in MB>]]></c></marker></tag>
+ <item>
+ Set super carrier size (in MB). The super carrier size defaults to
+ zero; i.e, the super carrier is by default disabled. The super
+ carrier is a large continuous area in the virtual address space.
+ The system will always try to create new carriers in the super
+ carrier.
+ <br/><br/>
+ <em>NOTE</em>: The super carrier cannot be enabled nor
+ disabled on halfword heap systems. This flag will be
+ ignored on halfword heap systems.
+ </item>
<tag><marker id="MMmcs"><c><![CDATA[+MMmcs <amount>]]></c></marker></tag>
<item>
Max cached segments. The maximum number of memory segments