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authorRickard Green <[email protected]>2013-05-05 19:47:05 +0200
committerRickard Green <[email protected]>2013-05-17 11:00:48 +0200
commit5c039a1fb4979314912dc3af6626d8d7a1c73993 (patch)
tree91b082ab3f3234e52f59ff689ac772bb93069b85 /erts/doc/src/erl.xml
parentad7231b1b5227f2ba9baa58c1c436ff9a95d2c67 (diff)
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Introduce a better id allocation algorithm for PTabs
Diffstat (limited to 'erts/doc/src/erl.xml')
-rw-r--r--erts/doc/src/erl.xml24
1 files changed, 20 insertions, 4 deletions
diff --git a/erts/doc/src/erl.xml b/erts/doc/src/erl.xml
index 9f5de8a9ae..a7b05899fd 100644
--- a/erts/doc/src/erl.xml
+++ b/erts/doc/src/erl.xml
@@ -637,10 +637,11 @@
<p>Se also <seealso marker="stdlib:io#printable_range/0">
io:printable_range/0</seealso>.</p>
</item>
- <tag><marker id="+P"/><marker id="max_processes"><c><![CDATA[+P Number]]></c></marker></tag>
+ <tag><marker id="+P"/><marker id="max_processes"><c><![CDATA[+P Number|legacy]]></c></marker></tag>
<item>
<p>Sets the maximum number of simultaneously existing processes for this
- system. Valid range for <c>Number</c> is <c>[1024-134217727]</c></p>
+ system if a <c>Number</c> is passed as value. Valid range for
+ <c>Number</c> is <c>[1024-134217727]</c></p>
<p><em>NOTE</em>: The actual maximum chosen may be much larger than
the <c>Number</c> passed. Currently the runtime system often,
but not always, chooses a value that is a power of 2. This might,
@@ -648,11 +649,19 @@
checked by calling
<seealso marker="erlang#system_info_process_limit">erlang:system_info(process_limit)</seealso>.</p>
<p>The default value is <c>262144</c></p>
+ <p>If <c>legacy</c> is passed as value, the legacy algorithm for
+ allocation of process identifiers will be used. Using the legacy
+ algorithm, identifiers will be allocated in a strictly increasing
+ fashion until largest possible identifier has been reached. Note that
+ this algorithm suffers from performance issues and can under certain
+ circumstances be extremely expensive. The legacy algoritm is deprecated,
+ and the <c>legacy</c> option is scheduled for removal in OTP-R18.</p>
</item>
- <tag><marker id="+Q"/><marker id="max_ports"><c><![CDATA[+Q Number]]></c></marker></tag>
+ <tag><marker id="+Q"/><marker id="max_ports"><c><![CDATA[+Q Number|legacy]]></c></marker></tag>
<item>
<p>Sets the maximum number of simultaneously existing ports for this
- system. Valid range for <c>Number</c> is <c>[1024-134217727]</c></p>
+ system if a Number is passed as value. Valid range for <c>Number</c>
+ is <c>[1024-134217727]</c></p>
<p><em>NOTE</em>: The actual maximum chosen may be much larger than
the actual <c>Number</c> passed. Currently the runtime system often,
but not always, chooses a value that is a power of 2. This might,
@@ -671,6 +680,13 @@
for setting the maximum number of simultaneously existing ports. This
environment variable is deprecated, and scheduled for removal in
OTP-R17, but can still be used.</p>
+ <p>If <c>legacy</c> is passed as value, the legacy algorithm for
+ allocation of port identifiers will be used. Using the legacy
+ algorithm, identifiers will be allocated in a strictly increasing
+ fashion until largest possible identifier has been reached. Note that
+ this algorithm suffers from performance issues and can under certain
+ circumstances be extremely expensive. The legacy algoritm is deprecated,
+ and the <c>legacy</c> option is scheduled for removal in OTP-R18.</p>
</item>
<tag><marker id="compat_rel"><c><![CDATA[+R ReleaseNumber]]></c></marker></tag>
<item>