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= Checkpoint and Restore Applications with CRUI =
= Perl =
The CRIU (Checkpoint/Restore in User-space) projects offers a user-space implementation of process and process group checkpoint/restore. With the user-space tools crtools included in this release it is possible checkpoint processes and restore them at a later time again (e.g. after a crash) or migrate the checkpointed process or process group to another system. CRIU aims to be as transparent as possible so that no instrumentation or re-compilation of the process to be checkpointed is necessary.
== Perl updated to 5.16 ==
Perl 5.16 introduces a number of significant changes:
 
=== New Features ===
* Unicode 6.1
* More consistent ''eval'' controlled with ''unicode_eval'' and ''evalbytes'' feature
* 2- and 3-argument ''substr'' called in left-value context is evaluted even after changing original string
* New ''T_*REF_REFCOUNT_FIXED'' XS typemap fixing reference counter decremetion
* New ''is_utf8_char_buf'' XS-callable function replaces broken ''is_utf8_char'' function
* ''$$'' variable is writable
* Improved debugger: tracing mode can be restricted to certain level, breakpoints can be disabled temporarily, breakpoints can be set by file name
* ''sort'' subroutines can be autoloaded
* ''$['' variable is provided by ''arybase'' module
* mmaped PerlIO layer is now a separate module ''PerlIO::mmap''
 
=== Deprecated Features ===
* Accessing Unicode database files directly is deprecated now; use ''Unicode::UCD'' instead
* ''Version::Requirements'' is deprecated in favor of ''CPAN::Meta::Requirements''


=== Incompatible Changes ===
Using the `crtools` package, users can easily checkpoint and restore processes with the crtools package:
* Special blocks (e.g. ''BEGIN'') are called in void context
* Unoverloaded stringification of regular expression does not return the expression literal
* ''T_DATAUNIT'' and ''T_CALLBACK'' XS typemaps removed
* User defined case-changing has been removed in favor of ''Unicode::Casing''
* XSUB C functions are static now and they are not exported from their object files
* Read-only references cannot be weaken
* ''$$'',  ''$<'', ''$>'', ''$('', and ''$)'' do not cache their value
* ''Devel::DProf'', ''Shell'' have been removed from Perl core
* perl4 libraries removed: abbrev.pl, assert.pl, bigfloat.pl, bigint.pl, bigrat.pl, cacheout.pl, complete.pl, ctime.pl, dotsh.pl, exceptions.pl, fastcwd.pl, flush.pl, getcwd.pl, getopt.pl, getopts.pl, hostname.pl, importenv.pl, lib/find{,depth}.pl, look.pl, newgetopt.pl, open2.pl, open3.pl, pwd.pl, hellwords.pl, stat.pl, tainted.pl, termcap.pl, timelocal.pl


= Python updated to 3.3 =
`crtools dump -D <dump-directory> -t <PID>`
The system Python 3 stack has been upgraded to 3.3 (the system Python 2 stack remains at 2.7), bringing in hundreds of fixes and tweaks; for a list of changes see http://docs.python.org/dev/whatsnew/3.3.html


= Ruby stack updated =
`crtools restore -D <dump-directory -t <PID>`
Fedora 18 will provide Rails 3.2, the latest version of the Rails stack. Developers are able to use the latest Rails features, which are documented in the project's release notes:
http://guides.rubyonrails.org/3_2_release_notes.html
http://guides.rubyonrails.org/3_1_release_notes.html


= Clojure joined by leiningen and tools =
To learn more about CRUI, visit http://criu.org and read `man 1 crtools`
Fedora 18 now ships a more complete Clojure programming stack, including the build tool Leiningen. This will make it easier to package other Clojure libraries in the future.


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Revision as of 05:54, 8 May 2013

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Checkpoint and Restore Applications with CRUI

The CRIU (Checkpoint/Restore in User-space) projects offers a user-space implementation of process and process group checkpoint/restore. With the user-space tools crtools included in this release it is possible checkpoint processes and restore them at a later time again (e.g. after a crash) or migrate the checkpointed process or process group to another system. CRIU aims to be as transparent as possible so that no instrumentation or re-compilation of the process to be checkpointed is necessary.

Using the crtools package, users can easily checkpoint and restore processes with the crtools package:

crtools dump -D <dump-directory> -t <PID>

crtools restore -D <dump-directory -t <PID>

To learn more about CRUI, visit http://criu.org and read man 1 crtools

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