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This page describes the first steps to play with the Xeon Phi installed in the Digitalis platform in idphix.

Contents

Overview

A Xeon Phi 5110P is installed in the idphix machine

The setup is the following:

We use an internal network on the host (idphix) for the Xeon Phi: 192.168.1.0/24.

This gives the following scheme:

                          =======================================
                        | -------------             -----------  |
                        ||    host     |           |  Xeon Phi | |
                        ||   idphix    |           |idphix-mic0| |
Grid5000 network <---> eth0           mic0 <----> mic0         | |
                    172.16.21.6 192.168.1.254  192.168.1.1     | |
                        ||             |           |           | |
                        | -------------             -----------  |
                          =======================================


How to experiment ?

For now (20130913) the operating system is a Centos 6 (OS officially supported by Intel for the Xeon Phi)


Step 0: connect to digitalis/grid5000

workstation$ ssh digitalis.grenoble.g5k

In case of issues (network issue, connection hanging...) please read more info here

Step 1: reserve the machine/run a job

digitalis$ oarsub -p "machine='idphix'" -l walltime=2 "sleep 2h"

Step 2: setup your access to the Xeon Phi

(This might not be relevant if your are using some level of abstraction (COI, ...)

Make sure you created your G5K ssh keys (keys without passephrase protection, dedicated to G5K and stored in your NFS home directory)

Run:

idphix$ sudo /usr/local/bin/mic-setup-my-user

If you get the error:

Error: Cannot get your SSH keys, please run 'chmod 755 ~/.ssh && chmod 644 ~/.ssh/{authorized_keys,id_*.pub}'

Please run:

chmod 755 ~/.ssh && chmod 644 ~/.ssh/{authorized_keys,id_*.pub}

Output should be:

idphix$ sudo /usr/local/bin/mic-setup-my-user 
*** Configure user pneyron:users (10106:8000) on mic0
*** Copy user files to mic0
id_rsa.pub                                    100%  420     0.4KB/s   00:00    
authorized_keys                               100%  916     0.9KB/s   00:00    
.profile                                      100%   62     0.1KB/s   00:00    
*** Force creation of pneyron:users on mic0 and fix file ownership and permission
Done


Step 4: (cross-)compile with icc

Intel compiler is installed in /opt/intel. It is configured to use [[1]] license server. (Please mind thanking CIMENT and Grid'5000 in your publications)

workstation$ ssh kaapiuser@idphix.grenoble.grid5000.fr.g5k # -> password is grid5000 kaapiuser@idphix$ /opt/intel/bin/icc toto.c icc: error #10236: File not found: 'toto.c' icc: command line error: no files specified; for help type "icc -help" ...

Step 5: run your code

To be completed, here below we just run a basic uname on the Mic, to get the description of the Mic OS. kaapiuser@idphix$ ssh mic0 uname -a Linux idphix-mic0.grenoble.grid5000.fr 2.6.38.8-g5f2543d #2 SMP Tue Apr 30 14:05:06 PDT 2013 k1om k1om k1om GNU/Linux

References

Miscellaneous

Intel compiler (icc) failure ?

If icc complains about the license (error message talking about FlexLM), please report the issue to [[2]]

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