[Vagnekman-users] New fat nodes now available for pilot testing on Vagn

[Mats Kronberg]

Dear Vagn users,

Two new Vagn nodes (a7 and a8) are now available for pilot testing during
the summer (July/August).

CPU: 4 x AMD Opteron 6128 HE "Magny-Cours" @ 2.0 GHz (32 cores per node).
RAM: 256 GB per node.

We encourage all Vagn users to test their applications on the new nodes
during the pilot test.

All Vagn users can now use these nodes. To run jobs on the new nodes during
the pilot test, use the "pilot" partition. Examples:

interactive -n 1 -t 8:00:00 -p pilot
sbatch -p pilot myscript.sh

The "pilot" partition allows node sharing, so if you need an entire node you
need to allocate a whole node, e.g by specifying 1 node and 32 cores:
interactive -N 1 -n 32 -t 8:00:00 -p pilot


Important note: if you have built your own applications with
machine-specific optimization (e.g "icc -xSSE3"), you will probably need to
recompile them.

An application that is optimized for the wrong platform will fail with an
error message similar to this:

> Fatal Error: This program was not built to run on the processor in
> your system.  The allowed processors are: Intel(R) processors with
> Swing New Instructions support.

If you need to recompile your binaries, performance should in most cases be
good enough if you compile using "-O2 -ip -xW". This will result in binaries
that will work on all nodes.


NSC has performed basic testing of the default version of all applications
available through the module system, and they all seems to work except for
ParaView and VisIt.

If you find other NSC-provided binaries (i.e applications available through
"module add" or found in /software) that does not work on the new nodes,
please report this to vagnekman-support at snic.vr.se. We will try to have all
applications working on the new nodes before pilot testing ends,


As always, please contact vagnekman-support at snic.vr.se if you have any
questions regarding this.

-- 
Mats Kronberg, NSC Support <vagnekman-support at snic.vr.se>
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