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Автор SHA1 Сообщение Дата
Rolf vandeVaart
14e7bcc383 Create new entries in the wrapper data files so the
administrator can specify compiler flags that get
inserted into the command before the user's flags.
These flags can be specified at configure time.
Reviewed by Jeff Squyres.

This fixes ticket #2474.

This commit was SVN r23709.
2010-09-02 10:47:55 +00:00
Rainer Keller
97511912ec - Fixup several functions, that cannot return
- Add one instance where we do not use a parameter in a function
 - Fix a buglet in commit r23689, where the attribute-for-function ptrs
   was applied.

This commit was SVN r23690.

The following SVN revision numbers were found above:
  r23689 --> open-mpi/ompi@5eb571c458
2010-08-31 12:21:13 +00:00
Ralph Castain
2e223abe33 Restore the auto-poll method for detecting debugger attachment, but only in the mpirx debugger module and only if the corresponding rate mca param is set.
Guess we missed it before, but add the debugger framework to the orte-info and ompi_info tools

This commit was SVN r23667.
2010-08-25 22:52:33 +00:00
Josh Hursey
e12ca48cd9 A number of C/R enhancements per RFC below:
http://www.open-mpi.org/community/lists/devel/2010/07/8240.php

Documentation:
  http://osl.iu.edu/research/ft/

Major Changes: 
-------------- 
 * Added C/R-enabled Debugging support. 
   Enabled with the --enable-crdebug flag. See the following website for more information: 
   http://osl.iu.edu/research/ft/crdebug/ 
 * Added Stable Storage (SStore) framework for checkpoint storage 
   * 'central' component does a direct to central storage save 
   * 'stage' component stages checkpoints to central storage while the application continues execution. 
     * 'stage' supports offline compression of checkpoints before moving (sstore_stage_compress) 
     * 'stage' supports local caching of checkpoints to improve automatic recovery (sstore_stage_caching) 
 * Added Compression (compress) framework to support 
 * Add two new ErrMgr recovery policies 
   * {{{crmig}}} C/R Process Migration 
   * {{{autor}}} C/R Automatic Recovery 
 * Added the {{{ompi-migrate}}} command line tool to support the {{{crmig}}} ErrMgr component 
 * Added CR MPI Ext functions (enable them with {{{--enable-mpi-ext=cr}}} configure option) 
   * {{{OMPI_CR_Checkpoint}}} (Fixes trac:2342) 
   * {{{OMPI_CR_Restart}}} 
   * {{{OMPI_CR_Migrate}}} (may need some more work for mapping rules) 
   * {{{OMPI_CR_INC_register_callback}}} (Fixes trac:2192) 
   * {{{OMPI_CR_Quiesce_start}}} 
   * {{{OMPI_CR_Quiesce_checkpoint}}} 
   * {{{OMPI_CR_Quiesce_end}}} 
   * {{{OMPI_CR_self_register_checkpoint_callback}}} 
   * {{{OMPI_CR_self_register_restart_callback}}} 
   * {{{OMPI_CR_self_register_continue_callback}}} 
 * The ErrMgr predicted_fault() interface has been changed to take an opal_list_t of ErrMgr defined types. This will allow us to better support a wider range of fault prediction services in the future. 
 * Add a progress meter to: 
   * FileM rsh (filem_rsh_process_meter) 
   * SnapC full (snapc_full_progress_meter) 
   * SStore stage (sstore_stage_progress_meter) 
 * Added 2 new command line options to ompi-restart 
   * --showme : Display the full command line that would have been exec'ed. 
   * --mpirun_opts : Command line options to pass directly to mpirun. (Fixes trac:2413) 
 * Deprecated some MCA params: 
   * crs_base_snapshot_dir deprecated, use sstore_stage_local_snapshot_dir 
   * snapc_base_global_snapshot_dir deprecated, use sstore_base_global_snapshot_dir 
   * snapc_base_global_shared deprecated, use sstore_stage_global_is_shared 
   * snapc_base_store_in_place deprecated, replaced with different components of SStore 
   * snapc_base_global_snapshot_ref deprecated, use sstore_base_global_snapshot_ref 
   * snapc_base_establish_global_snapshot_dir deprecated, never well supported 
   * snapc_full_skip_filem deprecated, use sstore_stage_skip_filem 

Minor Changes: 
-------------- 
 * Fixes trac:1924 : {{{ompi-restart}}} now recognizes path prefixed checkpoint handles and does the right thing. 
 * Fixes trac:2097 : {{{ompi-info}}} should now report all available CRS components 
 * Fixes trac:2161 : Manual checkpoint movement. A user can 'mv' a checkpoint directory from the original location to another and still restart from it. 
 * Fixes trac:2208 : Honor various TMPDIR varaibles instead of forcing {{{/tmp}}} 
 * Move {{{ompi_cr_continue_like_restart}}} to {{{orte_cr_continue_like_restart}}} to be more flexible in where this should be set. 
 * opal_crs_base_metadata_write* functions have been moved to SStore to support a wider range of metadata handling functionality. 
 * Cleanup the CRS framework and components to work with the SStore framework. 
 * Cleanup the SnapC framework and components to work with the SStore framework (cleans up these code paths considerably). 
 * Add 'quiesce' hook to CRCP for a future enhancement. 
 * We now require a BLCR version that supports {{{cr_request_file()}}} or {{{cr_request_checkpoint()}}} in order to make the code more maintainable. Note that {{{cr_request_file}}} has been deprecated since 0.7.0, so we prefer to use {{{cr_request_checkpoint()}}}. 
 * Add optional application level INC callbacks (registered through the CR MPI Ext interface). 
 * Increase the {{{opal_cr_thread_sleep_wait}}} parameter to 1000 microseconds to make the C/R thread less aggressive. 
 * {{{opal-restart}}} now looks for cache directories before falling back on stable storage when asked. 
 * {{{opal-restart}}} also support local decompression before restarting 
 * {{{orte-checkpoint}}} now uses the SStore framework to work with the metadata 
 * {{{orte-restart}}} now uses the SStore framework to work with the metadata 
 * Remove the {{{orte-restart}}} preload option. This was removed since the user only needs to select the 'stage' component in order to support this functionality. 
 * Since the '-am' parameter is saved in the metadata, {{{ompi-restart}}} no longer hard codes {{{-am ft-enable-cr}}}. 
 * Fix {{{hnp}}} ErrMgr so that if a previous component in the stack has 'fixed' the problem, then it should be skipped. 
 * Make sure to decrement the number of 'num_local_procs' in the orted when one goes away. 
 * odls now checks the SStore framework to see if it needs to load any checkpoint files before launching (to support 'stage'). This separates the SStore logic from the --preload-[binary|files] options. 
 * Add unique IDs to the named pipes established between the orted and the app in SnapC. This is to better support migration and automatic recovery activities. 
 * Improve the checks for 'already checkpointing' error path. 
 * A a recovery output timer, to show how long it takes to restart a job 
 * Do a better job of cleaning up the old session directory on restart. 
 * Add a local module to the autor and crmig ErrMgr components. These small modules prevent the 'orted' component from attempting a local recovery (Which does not work for MPI apps at the moment) 
 * Add a fix for bounding the checkpointable region between MPI_Init and MPI_Finalize. 

This commit was SVN r23587.

The following Trac tickets were found above:
  Ticket 1924 --> https://svn.open-mpi.org/trac/ompi/ticket/1924
  Ticket 2097 --> https://svn.open-mpi.org/trac/ompi/ticket/2097
  Ticket 2161 --> https://svn.open-mpi.org/trac/ompi/ticket/2161
  Ticket 2192 --> https://svn.open-mpi.org/trac/ompi/ticket/2192
  Ticket 2208 --> https://svn.open-mpi.org/trac/ompi/ticket/2208
  Ticket 2342 --> https://svn.open-mpi.org/trac/ompi/ticket/2342
  Ticket 2413 --> https://svn.open-mpi.org/trac/ompi/ticket/2413
2010-08-10 20:51:11 +00:00
Eugene Loh
5e1f40ba12 Clean up English and clarify a point regarding process binding
in the mpirun man page.

This commit was SVN r23558.
2010-08-05 23:10:44 +00:00
Eugene Loh
1c12192c93 Fix grammatical typo in orterun man page.
This commit was SVN r23555.
2010-08-04 20:37:28 +00:00
Ralph Castain
8ccd14d508 Correct the -h output to reflect that --bind-to-none is the default behavior
This commit was SVN r23537.
2010-08-01 22:31:34 +00:00
Jeff Squyres
64cb8f5d7f Another round of man page cleanups from Debian mantainer Manuel
Prinz.  Many thanks!

This commit was SVN r23445.
2010-07-20 14:07:18 +00:00
Ralph Castain
12cd07c9a9 Start reducing our dependency on the event library by removing at least one instance where we use it to redirect the program counter. Rolf reported occasional hangs of mpirun in very specific circumstances after all daemons were done. A review of MTT results indicates this may have been happening more generally in a small fraction of cases.
The problem was tracked to use of the grpcomm.onesided_barrier to control daemon/mpirun termination. This relied on messaging -and- required that the program counter jump from the errmgr back to grpcomm. On rare occasions, this jump did not occur, causing mpirun to hang.

This patch looks more invasive than it is - most of the affected files simply had one or two lines removed. The essence of the change is:

* pulled the job_complete and quit routines out of orterun and orted_main and put them in a common place

* modified the errmgr to directly call the new routines when termination is detected

* removed the grpcomm.onesided_barrier and its associated RML tag

* add a new "num_routes" API to the routed framework that reports back the number of dependent routes. When route_lost is called, the daemon's list of "children" is checked and adjusted if that route went to a "leaf" in the routing tree

* use connection termination between daemons to track rollup of the daemon tree. Daemons and HNP now terminate once num_routes returns zero

Also picked up in this commit is the addition of a new bool flag to the app_context struct, and increasing the job_control field from 8 to 16 bits. Both trivial.

This commit was SVN r23429.
2010-07-17 21:03:27 +00:00
Ralph Castain
23b166cbd4 Initialize pointers to NULL
This commit was SVN r23422.
2010-07-15 16:33:57 +00:00
Ralph Castain
2193ace464 Ensure the debugger symbols are loaded into orterun prior to orte_init so they are found by attaching debuggers.
This commit was SVN r23368.
2010-07-09 17:51:00 +00:00
Ralph Castain
31295e8dc2 As discussed on today's telecon, reorganize the debugger attachment code in orte to better support efforts within the tool community aimed at exploring alternative methods. Move the debugger attachment code from the orterun directory to a new debugger framework. Organize the existing standard support code into an "mpir" component. Organize the current extensions for co-spawning debugger daemons into a separate "mpirx" component.
Since the MPIR symbols are now included in the ORTE library, remove duplicate declarations in OMPI and replace them with extern references to their ORTE instantiations.

This commit was SVN r23360.
2010-07-06 23:35:42 +00:00
Jeff Squyres
8fef296b8a Updates about thread support levels.
This commit was SVN r23341.
2010-07-02 13:14:09 +00:00
Ralph Castain
628936a99f Provide a convenience option to disable fault recovery (as opposed to setting three separate, long-named mca params)
This commit was SVN r23327.
2010-07-01 19:31:11 +00:00
Ralph Castain
099c3aad97 Fix a major foopah that broke debugger attach. With the revisions in updating proc state, we dropped the recording of each proc's pid. Thus, attaching debuggers would find a proctable whose pids all equal 0.
This required modification of the errmgr.update_state API so the pid could be passed in to the function that could update the proper data record(s). All calls to that API have been updated as well, but I obviously couldn't test them all.

Thanks to Dong Ahn (LLNL) for catching this problem!

Also fixed debugger daemon cospawn, both for initial launch and attach-while-running modes. Tested and verified on rsh and slurm.

This commit was SVN r23300.
2010-06-24 05:13:53 +00:00
Ralph Castain
ae746a390f Debugger daemons spawned upon attachment to a running job need to be treated just like a regular job - they are not "piggybacking" onto an existing launch, and so the orte daemons need to report them just like a regular job launch in order to release from spawn.
Modify the debugger control flag to include "do not monitor" so orterun will not take debugger daemon termination into account when deciding that all jobs are done.

This commit was SVN r23282.
2010-06-19 15:22:36 +00:00
Jeff Squyres
f1a7b5cc33 Make "processor affinity not supported" error message a little better:
* Remove OPAL_ERR_PAFFINITY_NOT_SUPPORTED; fit it into the generic
   OPAL_ERR_NOT_SUPPORTED case.
 * When odls_default detects that processor affinity is not supported,
   it prints a specific message about it, and then it suppressed a
   generic HNP help message that would normally follow it (i.e., it's
   easier to have the "processor affinity is not supported" show_help
   message last).
 * Use some symbolic names in odls_default instead of fixed int's,
   just for slight readability improvements in the code.
 * Introduce orte_show_help_suppress(), which gives the ability to
   suppress any future showings of any arbitrary show_help() message.
   This is useful if you display message X and want to suppress
   message Y.  This suppression *only* works in environments where
   orte_show_help() does coalescing.

This commit was SVN r23249.
2010-06-08 20:16:07 +00:00
Jeff Squyres
e734939ddf Minor wrod wrapping to make the text fit within the show_help lines.
This commit was SVN r23219.
2010-05-28 20:25:54 +00:00
Josh Hursey
f57e73d4e5 add a few more missing SOS includes
This commit was SVN r23168.
2010-05-18 15:00:07 +00:00
Jeff Squyres
76d1bb3c96 Per some off-list discussion with Ralph and George, MPIR_being_debugged
really should be volatile.

This commit was SVN r23166.
2010-05-18 11:42:41 +00:00
Abhishek Kulkarni
260eaa24dd Add a missing header. Bleh.
This commit was SVN r23165.
2010-05-17 23:55:53 +00:00
Abhishek Kulkarni
8335ff3893 Fixing a branch merge issue. Looks like we picked the wrong branch when resolving
a conflict.

This commit was SVN r23164.
2010-05-17 23:49:46 +00:00
Abhishek Kulkarni
afbe3e99c6 * Wrap all the direct error-code checks of the form (OMPI_ERR_* == ret) with
(OMPI_ERR_* = OPAL_SOS_GET_ERR_CODE(ret)), since the return value could be a
 SOS-encoded error. The OPAL_SOS_GET_ERR_CODE() takes in a SOS error and returns
 back the native error code.

* Since OPAL_SUCCESS is preserved by SOS, also change all calls of the form
  (OPAL_ERROR == ret) to (OPAL_SUCCESS != ret). We thus avoid having to
  decode 'ret' to get the native error code.

This commit was SVN r23162.
2010-05-17 23:08:56 +00:00
Ralph Castain
88f5217a12 Cleanup the debugger daemon co-launch code and add an ability to test it. Implement ability to co-launch debugger daemons upon attach to a running job for jobs launched under rsh, slurm, and tm environments (others can easily be added if desired).
Add new mca params to test:

orte_debugger_test_daemon: Name of the executable to be used to simulate a debugger colaunch
orte_debugger_test_attach: Test debugger colaunch after debugger attachment

To test co-launch at job start, just set the orte_debugger_test_daemon param.

To test co-launch upon attach:
set orte_debugger_test_daemon
set orte_debugger_test_attach=1
set orte_enable_debug_cospawn_while_running=1
set orte_debugger_check_rate=<N> - defines the number of seconds to wait before "checking" for a debugger attaching

Added a "debugger" program to orte/test/mpi that just spins to simulate a debugger daemon.

This commit was SVN r23144.
2010-05-14 18:44:49 +00:00
Ralph Castain
7ce34223f1 Per off-list discussion, implement the new OMPI exit status policy (soon to be on wiki) and further cleanup error reporting to cover new cases.
Implement process migration when failed nodes are detected. Some testing still required

This commit was SVN r23121.
2010-05-12 18:11:58 +00:00
Ralph Castain
4bd25f587c Begin handling the case of lost connections by having the OOB report it to the errmgr instead of the routed framework. Add an "app" component to t
he errmgr framework so that it can decide how to respond - which for now at least is just to check for lifeline and abort if so.

Add a new error constant to indicate that the error is "unrecoverable" so the oob can know it needs to abort.

This commit was SVN r23112.
2010-05-11 00:34:12 +00:00
Ralph Castain
d6a1d7a082 Little more cleanup on paffinity. Provide a specific error code for affinity not supported so we can better report the problem. Move the error reporting to orterun so we only get one error message. Update the darwin paffinity module to return the correct new error codes.
This commit was SVN r23107.
2010-05-07 14:04:55 +00:00
Ralph Castain
2ff1ae13e1 Create a new "heartbeat" module in the sensor framework and move the plm_base heartbeat code there. Add new proc and job states for heartbeat_failed. Remove the "heartbeat" cmd line option for orted as this is now done automatically if the --enable-heartbeat configure option is set.
This commit was SVN r23102.
2010-05-05 00:48:43 +00:00
Ralph Castain
9dfb5c7c62 Rename the orte state framework to be "db", which more accurately reflects its overall capabilities since it can store any kind of data (not just state, although that will be its primary purpose). Update tools and tests accordingly. Add a daemon module for storing data on the daemons - requires --enable-multicast, so it won't build unless that is set
This commit was SVN r23082.
2010-05-03 04:11:03 +00:00
Ralph Castain
319758e3e0 Restore process recovery for procs local to mpirun (first step towards restoring full capability). Define three new MCA params:
1. orte_enable_recovery - default recovery policy, can be overridden on a per-job basis

2. orte_max_local_restarts - default max number of local restarts, can be overridden

3. orte_max_global_restarts - default max number of relocates, can be overridden

Implement the restart_proc API for the ODLS framework, reorganize the default fns a little to avoid copying code.

This commit was SVN r23057.
2010-04-28 04:06:57 +00:00
Ralph Castain
b9893aacc5 Add a sensor framework to ORTE that monitors applications and notifies the errmgr when they exceed specified boundaries. Two modules are included here:
1. file activity - can monitor file size, access and modification times. If these fail to change over a specified number of sampling iterations (rate is an mca param), then the errmgr is notified.

2. memory usage - checks amount of memory used by a process. Limit and sampling rate can be set.

This support must be enabled by configuring --enable-sensors.

ompi_info and orte-info have been updated to include the new framework.

Also includes some initial steps toward restoring the recovery capability. Most notably, the ODLS API has been extended to include a "restart_proc" entry for restarting a local process, and organizes the various ERRMGR framework globals into a single struct as we do in the other ORTE frameworks. Fix an oversight in the ERRMGR framework where a pointer array was constructed, but not initialized.

Implementation continues.

This commit was SVN r23043.
2010-04-26 22:15:57 +00:00
Ralph Castain
efbb5c9b7c Revamp the errmgr framework to provide a greater range of optional behaviors, including different behaviors for daemons, and remove several looping messages across the code base:
* add hnp and orted modules to the errmgr framework. The HNP module contains much of the code that was in the errmgr base since that code could only be executed by the HNP anyway.

* update the odls to report process states directly into the active errmgr module, thus removing the need to send messages looped back into the odls cmd processor. Let the active errmgr module decide what to do at various states.

* remove the code to track application state progress from the plm_base_launch_support.c code. Update the plm modules to call the errmgr directly when a launch fails.

* update the plm_base_receive.c code to call the errmgr with state updates from remote daemons

* update the routed modules to reflect that process state is updated in the errmgr

* ensure that the orted's open the errmgr and select their appropriate module

* add new pretty-print utilities to print process and job state. Move the pretty-print of time info to a globally-accessible place

* define a global orte_comm function to send messages from orted's to the HNP so that others can overlay the standard RML methods, if desired.

* update the orterun help output to reflect that the "term w/o sync" error message can result from three, not two, scenarios

This commit was SVN r23023.
2010-04-23 04:44:41 +00:00
Shiqing Fan
d1e66bdd01 Use variables instead of hard-coded compiler flags, in order to support various C/C++ compilers on Windows.
This commit was SVN r23016.
2010-04-21 12:45:00 +00:00
Ralph Castain
4308922f59 Ensure that any application-specific selection of ess module doesn't get overridden by what is given to the orted or orterun
Cleanup tool name determination for CM

This commit was SVN r22980.
2010-04-15 18:10:50 +00:00
Ralph Castain
c32f046d7c Tiny cleanup - when the user kills us with a ctrl-c, there really isn't a need to tell him "your procs died and we don't know why". Just shaddup and die.
This commit was SVN r22949.
2010-04-09 18:47:35 +00:00
Ralph Castain
de6679dbd3 Truly respect the -quiet option. Make it an mca param so someone doesn't have to put it solely on the cmd line. Tell show_help to shaddup as well.
This commit was SVN r22926.
2010-04-02 14:19:38 +00:00
Ralph Castain
25a9a195b0 When the user requests "quiet", mpirun isn't supposed to output "helpful error messages" - so shaddup!
This commit was SVN r22925.
2010-04-02 07:13:11 +00:00
Jeff Squyres
c57a8fba5a Improve the help message when mpirun cannot find an executable.
Refs trac:2035

This commit was SVN r22922.

The following Trac tickets were found above:
  Ticket 2035 --> https://svn.open-mpi.org/trac/ompi/ticket/2035
2010-04-01 13:26:29 +00:00
Ralph Castain
24c3b4f849 Add the sysinfo framework to the "info" tools, especially since the odls_base_open function calls it!
This commit was SVN r22901.
2010-03-29 20:47:29 +00:00
Josh Hursey
e4f2d03d28 ErrMgr Framework redesign to better support fault tolerance development activities.
Explained in more detail in the following RFC:
  http://www.open-mpi.org/community/lists/devel/2010/03/7589.php

This commit was SVN r22872.
2010-03-23 21:28:02 +00:00
Josh Hursey
9e967a3a9b Revert this change, since even in the CR case we want to reset this var to NULL.
Thanks to Jeff for the catch.

This commit was SVN r22868.
2010-03-23 19:55:21 +00:00
Shiqing Fan
9591680ec0 One of the binaries was generated from a wrong source.
This commit was SVN r22865.
2010-03-23 09:56:11 +00:00
Ralph Castain
e291fc2c69 With Jeff's help, get the libraries to link as required.
Update ompi_info and orte-info to include the new framework.

Fix some selection logic and a typo'd variable name

Still remains ompi_ignored until we complete testing

This commit was SVN r22848.
2010-03-18 02:12:59 +00:00
Ralph Castain
b400b84162 Merge in the modified thread configure option branch per today's telecon.
Remove the --enable-progress-threads option as this is no longer functional, and hardcode OPAL_ENABLE_PROGRESS_THREADS to 0.

Replace the --enable-mpi-threads option with --enable-mpi-thread-multiple as this is clearer as to meaning. This option automatically turns "on" opal thread support if it wasn't already so specified. If the user specifies --disable-opal-multi-threads --enable-mpi-thread-multiple, we will error out with a message

Add a new --enable-opal-multi-threads option that turns "on" opal thread support without doing anything wrt mpi-thread-multiple

This commit was SVN r22841.
2010-03-16 23:10:50 +00:00
Rainer Keller
814fb9399f - Further patches for support on NetBSD (and DragonFly) by
Aleksej Saushev.
   Dont use bash or bashism in shell scripts
   We should use Posix' setpgid(0,0), which is equivalent to setpgrp().

This commit was SVN r22829.
2010-03-15 05:33:42 +00:00
Josh Hursey
e9b5162d79 Fix the configure logic for --with-ft so that it properly takes a comma separated list.
Many of the OPAL_ENABLE_FT should be OPAL_ENABLE_FT_CR, so fix those.

The OPAL Layer INC should call opal_output on restart so that it can refresh the string it prints to reflect the current pid/hostname which may have changed.

This commit was SVN r22824.
2010-03-12 23:57:50 +00:00
Ralph Castain
f2c65dc70f Ensure that the errmgr does not take action if the process was terminated by a "kill_procs" command as this can lead to circular logic.
Cleanup the kill_procs command by removing a no-longer-used param. We update the process state when the proc actually exits.

This commit was SVN r22783.
2010-03-05 13:22:12 +00:00
Ralph Castain
2541aa98ab Change the app_idx type to uint32_t to support users who use large numbers of app_contexts. Set it up as a new typedef so we can change it later without as much effort.
This commit was SVN r22727.
2010-02-27 17:37:34 +00:00
Ralph Castain
6c0d7940c7 Add a new MCA param (and corresponding mpirun cmd line option) to output the debugger proctable info after launch. The output is just the job map with the process pid included, so you get a node-by-node list of the process ranks on that node and thier pids.
Works for initial launch and comm_spawn. xml and non-xml output is available

This commit was SVN r22725.
2010-02-27 08:32:25 +00:00
Ralph Castain
18c7aaff08 Update the grpcomm framework to be more thread-friendly.
Modify the orte configure options to specify --enable-multicast such that it directs components to build or not instead of littering the code base with #if's. Remove those #if's where they used to occur.

Add a new grpcomm "mcast" module to support multicast operations. Still some work required to properly perform daemon collectives for comm_spawn operations. New module only builds when --enable-multicast is provided, and when specifically selected.

This commit was SVN r22709.
2010-02-25 01:11:29 +00:00