Using The Blue Gene
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List of Host/IP

Host Internet IP Services
sn 194.170.57.16 ssh, http (navigator)
fen1 194.170.57.17 ssh
fen2 194.170.57.18 ssh
fs1-fs4 Only accessible from BGL File Server

There are ionode1-ionode128 but I am not sure what they are and how to access them. Anyway, these are not important.

Note that there is no way to log into the compute nodes and run programs directly, since BGL is a batch system. We have to use mpirun or some kind of scheduler (such as LoadLeveler, which is currently not working) to submit the jobs to run on the compute nodes.

Navigator

Information about the hardware/system status can be found in the Blue Gene Navigator using the browser from here.
Note that only root can login to view the site.

VNC

VNC is useful since it gives a graphical desktop and work can be continued with the interruption of a disconnection of the internet, which happens all the time at PI.

To start a VNC out of CERT, for example from PI, we need to tunnel the VNC communication via SSH to the front end node.
So we need the following option when ssh to fen1 or fen2.

-L 5901:sn:5901

which will enable VNC session on the service node(sn). You can replace sn with localhost if you just want to start VNC on the front end node.

Then connect your VNC viewer to

localhost:5901

to start the VNC window.

Keep in mind that you have to login the server and start

vncserver

before using the vncviewer.

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