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authorSiri Hansen <[email protected]>2011-09-05 11:57:02 +0200
committerSiri Hansen <[email protected]>2011-09-05 11:57:02 +0200
commit53475d05e282cf04c9d206240961363a7189c6e7 (patch)
tree75fddeb5f52218792991a22b7ced397acd0a51c1 /lib/sasl/doc/src/release_handler.xml
parent7db84033da5880f2e3501865749a8c166fe2d358 (diff)
parent23a350702fd05ee45285c01172d2cba7ff9f5029 (diff)
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Merge branch 'siri/sasl/check_process_code/OTP-9395' into dev
* siri/sasl/check_process_code/OTP-9395: Add option purge to release_handler:check_install_release Improve performance of upgrade when many processes have old code
Diffstat (limited to 'lib/sasl/doc/src/release_handler.xml')
-rw-r--r--lib/sasl/doc/src/release_handler.xml28
1 files changed, 27 insertions, 1 deletions
diff --git a/lib/sasl/doc/src/release_handler.xml b/lib/sasl/doc/src/release_handler.xml
index 4a973bc5ed..5ac0dc1acc 100644
--- a/lib/sasl/doc/src/release_handler.xml
+++ b/lib/sasl/doc/src/release_handler.xml
@@ -4,7 +4,7 @@
<erlref>
<header>
<copyright>
- <year>1996</year><year>2009</year>
+ <year>1996</year><year>2011</year>
<holder>Ericsson AB. All Rights Reserved.</holder>
</copyright>
<legalnotice>
@@ -159,9 +159,12 @@ old reboot_old permanent
<funcs>
<func>
<name>check_install_release(Vsn) -> {ok, OtherVsn, Descr} | {error, Reason}</name>
+ <name>check_install_release(Vsn,Opts) -> {ok, OtherVsn, Descr} | {error, Reason}</name>
<fsummary>Check installation of a release in the system.</fsummary>
<type>
<v>Vsn = OtherVsn = string()</v>
+ <v>Opts = [Opt]</v>
+ <v>Opt = purge</v>
<v>Descr = term()</v>
<v>Reason = term()</v>
</type>
@@ -179,6 +182,11 @@ old reboot_old permanent
upgrade script.</p>
<p>Returns the same as <c>install_release/1</c>. <c>Descr</c>
defaults to "" if no <c>relup</c> file is found.</p>
+ <p>If the option <c>purge</c> is given, all old code that can
+ be soft purged will be purged after all other checks are
+ successfully completed. This can be useful in order to
+ reduce the time needed by <seealso
+ marker="#install_release/1">install_release</seealso>.</p>
</desc>
</func>
<func>
@@ -299,6 +307,24 @@ release_handler:set_unpacked(RelFile, [{myapp,"1.0","/home/user"},...]).
<c>{update_paths,true}</c>, afterwards
<c>code:lib_dir(myapp)</c> will return
<c>/home/user/myapp-1.0</c>.</p>
+ <note>
+ <p>Installing a new release might be quite time consuming if
+ there are many processes in the system. The reason is that
+ each process must be checked for references to old code
+ before a module can be purged. This check might lead to
+ garbage collections and copying of data.</p>
+ <p>If you wish to speed up the execution of
+ <c>install_release</c>, then you may call <seealso
+ marker="#check_install_release/1">check_install_release</seealso>
+ first, using the option <c>purge</c>. This will do the same
+ check for old code, and then purge all modules that can be
+ soft purged. The purged modules will then no longer have any
+ old code, and <c>install_release</c> will not need to do the
+ checks.</p>
+ <p>Obviously, this will not reduce the overall time for the
+ upgrade, but it will allow checks and purge to be executed
+ in the background before the real upgrade is started.</p>
+ </note>
</desc>
</func>
<func>