Cluster: Difference between revisions

Revision as of 17:56, 23 July 2009

General Information

home directory quota

There is a 10GB quota limit enforced on $HOME directory (/global/home/users/username) usage. Please keep your usage below this limit. There will NETAPP snapshots in place in this file system so we suggest you store only your source code and scripts in this area and store all your data under /clusterfs/cortex (see below).

data

For large amounts of data, please create a directory

 /clusterfs/cortex/scratch/username

and store the data inside that directory.

Connect

get a password

press the PASS WORD button on your crypto card
enter passoword
press enter
the 7 digit password is given (without the dash)

setup environment

put all your customizations into your .bashrc
for login shells, .bash_profile is used, which in turn loads .bashrc

ssh to the gateway computer (hadley)

note: please don't use the gateway for computations (e.g. matlab)!

 ssh -Y neuro-calhpc.berkeley.edu (or hadley.berkeley.edu)

and use your crypto password

Useful commands

Start interactive session on compute node

start interactive session:

 qsub -X -I

start interactive session on particular node (nodes n0000.cortex and n0001.cortex have GPUs):

 qsub -X -I -l nodes=n0001.cortex

Perceus commands

The perceus manual is here

listing available cluster nodes:

 wwstats

list cluster usage

 wwtop

to restrict the scope of these commands to cortex cluster, add the following line to your .bashrc

 export NODES='*cortex'

module list
module avail
module help

help pages are here

Resource Manager PBS

Job Scheduler MOAB
List running jobs:

 qstat -a

List jobs of a given node:

 qstat -n 98

sample script

 #!/bin/bash
 
 #PBS -q cortex
 #PBS -l nodes=1:ppn=2:cortex
 #PBS -l walltime=01:00:00
 #PBS -o path-to-output
 #PBS -e path-to-error
 cd /global/home/users/kilian/sample_executables
 cat $PBS_NODEFILE
 mpirun -np 8 /bin/hostname
 sleep 60

submit script

 qsub scriptname

interactive session

 qsub -I -q cortex -l nodes=1:ppn=2:cortex -l walltime=00:15:00

list nodes that your job is running on

 cat $PBS_NODEFILE

run the program on several cores

 mpirun -np 4 -mca btl ^openib sample_executables/mpi_hello

Matlab

note: remember to start an interactive session before starting matlab!

In order to use matlab, you have to load the matlab environment:

 module load matlab

Once the matlab environment is loaded, you can start a matlab session by running

 matlab -nojvm -nodesktop

Python

We have the Source Python Distribution installed [SPD]

Sage

Sage is http://sagemath.org. In order to use sage, you have to first load the sage environment module

 module load python/sage

After loading the sage module, if you want to have a scipy environment (run ipython, etc) in your interactive session, first do:

 % sage -sh

then you can run:

 % ipython

or you can just do:

 % sage -ipython

This is a temporary solution for people wanting use scipy with mpi on the cluster. It was built against the default openmpi (1.2.8) (icc) and mpi4py 1.1.0. For those using hdf5, I also built hdf5 1.8.3 (gcc) and h5py 1.2.

Sample pbs and mpi script is here:

 ~amirk/test

You can run it as:

 % mkdir -p ~/jobs
 % cd ~amirk/test
 % qsub pbs

--Amir

CUDA

I've installed CUDA 2.2 toolkit here:

 /clusterfs/cortex/software/cuda-2.2

The SDK is here:

 /clusterfs/cortex/software/cuda-2.2/sdk

To your PATH, add:

 /clusterfs/cortex/software/cuda-2.2/bin

To your LD_LIBRARY_PATH, add:

 /clusterfs/cortex/software/cuda-2.2/lib