LHCb Software At Nikhef: Prepare for Workshop 22-24 June 2009

Your first time to run over a MicroDST at Nikhef

Prepare ssh on your Nikhef account

Follow these instructions: Configuring SSH access from Linux/Unix

Logon at Nikhef

ssh user@ribble.nikhef.nl
ssh stbc-16   (on stoomboot)

Get software packages

mkdir cmtuser
cd cmtuser
source /project/bfys/lhcb/sw/setup.sh   # for sh, bash, ksh, zsh
source /project/bfys/lhcb/sw/setup.csh  # for csh, tcsh
SetupProject --build-env DaVinci v23r1
getpack --user=CERNUSERNAME Ex/MicroDSTExample jpalac_20090610_1

(NB: zsh-users should add 'setopt SH_WORD_SPLIT' to their .zshrc )

Loop over events

SetupProject DaVinci v23r1
cd ~/cmtuser/DaVinci_v23r1/Ex/MicroDSTExample/python
python -i MicroDSTReadingExample.py --input /data/bfys/h71/Workshop/SeqDC06selBs2JpsiPhiWithMC_50.0_Kevt_NoPVReFit.dst

Plot

>>> massPlots[443].Draw()
>>> massPlots[531].Draw()
>>> massResPlots[531].Draw()
>>> propTimePlots[531].Draw()
>>> Ctrl-D

Introduction to Python

It is important that attendees make themselves familiar with the python programming language, at least at the level of writing simple scripts.

Extensive tutorial: Tutorial

Cheat Sheet: Cheat Sheet

Install a Virtual Machine on your laptop: CernVM

See talk by Pere Mato, slide 14: 17 March 2009

CernVM beginner's guide: CernVM beginner's guide

1) Windows

1a) Download vmware player here

Unzip and put CernVM in fixed place. For example C:\Program Files\CernVM
Start vmplayer from desktop
Open CernVM from C:\Program Files\CernVM
Open in browser: http://192.168.204.128:8004/
                 (your number might be different!)
Create account. For example: use lxplus username and password
Virtual organization: lhcb
Change memory allocation in vmware player
  -> troubleshoot
     -> change memory allocation
         -> 1024 MB

1b) Start CernVM

Follow CernVM beginner's guide step by step: CernVM beginner's guide

1c) Start Exceed + SSH

Start exceed
Start ssh
Connect to vm with ssh to 192.168.204.128
     (Your number might be different!)
     (fink tunnel x11 connections in ssh!)

1d) Configure CernVM

(once for configuring cernvm:)
back to instructions afs
sudo conary update openafs=1.4.8-1-1
sudo conary update openafs-client=1.4.8-1-1
sudo conary update openafs-kernel=1.4.8-1-1
sudo /etc/init.d/afs start

1e) CernVM session on ssh

Never do: ls /opt/ !! (It could start caching all atlas software...)

kinit user@CERN.CH (capitals!)
cd /opt/lhcb
source /opt/lhcb/LbLogin.csh
SetupProject Gaudi v21r0
python $GAUDIEXAMPLESROOT/python/HistoEx.py
SetupProject Bender v12r0
cd $BENDEREXAMPLEROOT/python/BenderExample/
./Phi.py

1f) Create shared data folder on your laptop

Make folder C:\Data
Change properties of C:\Data
   -> sharing
     -> network sharing without wizard
       V share
          name: Data
       V allow 

Edit the 2kB VMware configuration file (in C:\Program Files\CernVM\ ) and add:

sharedFolder.maxNum = "1"

sharedFolder0.present = "TRUE"
sharedFolder0.enabled = "TRUE" 
sharedFolder0.readAccess = "TRUE"
sharedFolder0.writeAccess = "TRUE"
sharedFolder0.hostPath = "C:\Data"
sharedFolder0.guestName = "data"
sharedFolder0.expiration = "session"

usb.autoConnect.device1 = ""

NB: after editing the configuration file, restart VMware Player

In VMware:
  -> Share folders
     -> o always enabled

Add the following line to /etc/fstab:
sudo emacs -nw /etc/fstab
     .host:/ /mnt/hgfs vmhgfs defaults 0 0

sudo ln -s /usr/sbin/mount.vmhgfs /sbin

I edited Phi.py and put input data location: /mnt/hgfs/data/Bs2DsK_1.dst )
Data can be found here:
/afs/cern.ch/lhcb/group/calo/ecal/vol10/DATA
(or ask Niels or Vanya for a copy...)

Once everything is installed... Start CernVM

Start VMware Player (don't select 'Open', but 'Recent')

Login to your CernVM with your SSH.

source /opt/lhcb/LbLogin.csh
SetupProject Bender v12r1
./Phi.py

root 
TBrowser f
.q

2)MAC

I have succesfully tried using VirtualBox, from Sun Microsystems. It is free, it works. Follow more or less the instructions in [[ATLAS CernVM wiki][1]]

Download and untar CernVM 1.20 Get the one for VirtualBox from [2] Unzip and untar it. And figure out where in your file system it is. This will be the boot image "disk" for the operating system so VirtualBox will need it for booting. This must be done *before* the VirtualBox step.

Get VirtualBox http://www.virtualbox.org/wiki/Downloads Install it following instructions run it and follow https://twiki.cern.ch/twiki/bin/view/Atlas/CernVMGuideVirtualBox I went for ~1542MB memory

Name:                  CernVM
OS Type:              Linux 2.6
Base Memory:      1532 MB
Video Memory:    6 MB

Hard Disks
IDE Primary Master: cernvm-1.2.0-x86.vmdk (Normal, 5.24 GB)

I had some problems getting it to find the disk image. I did lots of clicking around and it worked in the end. I cannot replicate the "locate the vmdk file" snapshots in the [[wiki][3]] exactly. Maybe I'll try again to see.

For network setup, I used NAT following [[these instructions][4]]

Then I followed the rest of the steps [[here][5]]

After starting a session, it is necessary to source the LHCb login script:

source /opt/lhcb/LbLogin.csh

(check what shell you have set) I added it to my login script. Then, to cache lots of software,

SetupProject DaVinci v23r1 (no v23r1p1 yet)
SetupProject Panoramix v17r0 (no v17r1 yet)

Hubert has given me instructions on how to set the login scripts properly, so I'll try them and update this document later.

Juan