AlphaServer SC patch kit:
==========================

AlphaServer SC Version : SC V2.6 SSB 
Kit Name: SCV26SSB107658
Release Date: 06/23/2004
PTR: 153-2-1439
IPMT Number: CFS.107658
Abstract: MPI_COMM_CREATE fails when rank>1 with SCV26SSB107348B

This patch does not contain any kernel mods so you do not have to
build or deploy kernels or reboot any nodes to install it.

It does contain a static library (libmpi.a) and any program that
is statically linked against a previous version of this library
will have to be relinked to get the benefit of this fix. Dynamically
linked programs (which are the default) will pick up the new version
of libmpi.so automatically.


Description of Patch:
=====================
1. Fixes a problem in SCV26SSB107348B using subgroups with optimized
   collectives that could cause an MPI program to hang or core dump.

This patch supercedes SCV26SSB107348B and includes the following
fixes from that patch:

2. Fixes a problem in intra-node MPI that could lead to an assertion
   failure for MPI jobs that use more than one cpu on the same node:

     Assertion failed: ng==NULL, file adi2init.c, line 1112

   The same jobs would run successfully with one cpu per node (this
   uses inter-node MPI only).

3. Fixes a problem with subgroups that could cause an MPI program
   that used them to core dump during exit.


Kit location:
=============
The patch kit is SCV26SSB107658.tar.gz and it is available from
ITRC.


Prerequisites:
==============
Before installing this Patch kit, you should ensure the following:

1) You have all mandatory patches for this release installed

2) You have the following specific patches installed:

   SCV26105882 MPI mandatory patch for V2.6 SSB


Kit checksum:
=============
    # cksum SCV26SSB107658.tar.gz
    1469180038 1652759 SCV26SSB107658.tar.gz


Updated files:
==============
A list of the files included in this patch is given below
along with the cksum values for each file.

    1795171421 3946264 /usr/opt/mpi/lib/libmpi.a
    4146153463 3185584 /usr/opt/mpi/shlib/libmpi.so
     923996835 3193776 /usr/opt/mpi/shlib/libpmpi.so



Instructions:
=============
This patch is provided as a setld installable kit.  Unpack it
into a directory that is NFS mounted on all domains e.g.
/nfs/SCV26SSB107658 and install it as follows:

Patch required on Management Server (if used) : NO
Patch required on Domains                     : YES


On Domains:
-----------
    Install the patch as follows:
    # cd /nfs/SCV26SSB107658
    # scrun -d all setld -l /nfs/SCV26SSB107658 SCV26SSB107658

You do not need to build or deploy kernels or reboot any nodes.

This patch contain a static library (libmpi.a) and any program that
is statically linked against a previous version of this library
will have to be relinked to get the benefit of this fix. Dynamically
linked programs (which are the default) will pick up the new version
automatically.


    To remove the patch use the following commands:
    # scrun -d all setld -d SCV26SSB107658

=======================================================================