DEtector with Lepton, Photon, Hadron Identification
- central software
Frequently Asked Questions
Caution: This page is being rewritten. The informations on
the batch system and batch jobs often refer to the non-existing NQS system and
are obsolete. Other informations should be correct.
If you are facing a problem you cannot easily solve,
write to us
and we will try to provide you with an answer.
Also, if you are the expert and are flooded with questions,
let us know
and by publishing the questions here may be your life will get a bit easier...
- DELSHIFT usage
- SCRATCH disks
- AFS usage
- Files in home directory
- DELPHI news
- DELSHIFT usage
- Run-time problems
In my batch job I got thousands of error lines of the kind
I had no problems in my previous jobs. What happened?
***** ERROR in HRZOUT : An error has occured whilst writing data : ID= 1
***** ERROR in HNTWRT : An error has occured for //NTUPLES : ID= 1
RZOUT . Request exceeds quota
The reason is an unfortunate choice of parameters to HROPEN, which
prevents big files being output. Please have a look at a
special page we have made.
In my batch job I got the following warnings:
On other samples my analysis job works without
problems. What should I do?
FZIDIA. LUN= 11 BAD CONSTRUCTION
IQUEST(1/2/3)= -4 0 1
IQUEST(11-) = -4 201 0
%PHDST-E-PHQUES, Bad constructs, maybe not a FZ-file
Normally it is a problem of a corrupted file on disk.
Just clearing the file and re-staging normally helps.
If you are not sure how to do it, please contact
- Link problems
Under AFS I compile libraries with personal pieces of code. Will it
be possible to link these directly on SHIFT using compiler option
Yes, with the same syntax as usual.
Of course you may use here the shell environment variables.
Note that for machines where several versions of operating
systems exist (HPUX9/HPUX10, OSF1 V3/V4) you may have to
maintain several versions of libraries...
I have an undefined symbol
fpclassify during the link step.
Do you have an idea how to cure it?
This is the punishment for not using the standard
command. The suggested compiler/linker command sequence is:
$XLF77 $ADDCOMP -o program.exe program.f $ADDLIB \
`dellib skelana dstana vdclap phdst` \
`cernlib mathlib packlib`
The loader complains about something called
This is an obsolete piece of object code. You can safely remove
any reference to it from your script.
- Available queues
What are the available queues on DELSHIFT?
The basic queues are called
(for 8 minutes, 1 hour, 8 hours and 24 hours of normalised CPU
There are also some other queues, both
on DELSHIFT and on other clusters.
- Example job
I am new in DELPHI. Where can I find an example of the analysis job?
Have a look at into the
directory on CERN AFS.
The job there works without any changes on both DELSHIFT and LXBATCH.
The README file
provides simple instructions how to use it.
- Getting help
Again somebody has put his "golden hands" into ... (I wish I knew!),
causing that my program, in which I didn't change anything,
crashes since yesterday with a completely incomprehensible message.
If somebody knew what happened and wrote simply how to cure it,
I would be very grateful.
We will try to investigate your problem, but it should be obvious
that we need more
on your job...
The best and simplest is to complete the
- AFS usage
- Getting file from backup
I have accidentally deleted a file - may I get it back?
Yes, up to 1 year after - although it is really easy only for your
home directory files, and only for the version from the previous day.
The backup is done automatically every evening
They are put in the directory
- i.e. mimicking your normal home-directory name,
ubackup rather than
For example, if your login name is
then in order to recover the
cp -p \
For more details on restoring files from AFS backup independently
on their date and location, please see the recent
CERN Computer Newsletter article
on this subject. There is also an older, slightly obsolete
but having helpful examples.
- Setting up a group (team/task) disk area
In our team many people use files created by the others.
It would be more practical to have these files in one common area,
rather than to remember for each case who is the author.
Is this possible?
Some of our files must not be accessible from the outside.
The so-called AFS project-space is made just for that.
Have a look here.
- Making directories visible from outside
When I ask for help with my job crashing, people tell
me that they cannot read my script nor job output.
I don't understand it, as both these files have
the necessary permissions.
For the AFS file to be visible by the others it is not sufficient
to have correct standard Unix permissions - the directory itself
must also have the AFS-specific permissions.
All files in your root directory are visible only to you -
and you should not change this.
The standard way of storing files which you want to be read by the
others is to put them in your
Also all further sub-directories created under
will be by default visible by everybody, so you may organise your
If you insist of having a directory on your root level, please follow
the prescriptions given below for the
As you have guessed, all files and sub-directories created within
private sub-directory will be visible only to you.
- Disappearing home directory
I can't access my home directory on HPPLUS.
When I log on, I have the following messages:
No directory /afs/cern.ch/user/m/melanie!
Logging in with home = "/".
Can you do something for me?
This is normally a sign of problems with some AFS volume -
the one containing your home directory.
Normally it is resolved after a few minutes, so try again later.
Sometimes it is more serious (disk crash) and it will take
longer, with today files most probably lost.
Anyway, from the message you quote it should be obvious that
this is not a DELPHI software problem and nobody
in DELPHI can do anything. You should have a look on
CERN Computer Centre status,
very possibly the information on what is going on and how long
will it take is already there.
- Files in home directory
- Publishing WWW pages
I have created a WWW page in my ~/www directory on AFS, but all
browsers say it does not exist.
Both the file and the directory have read permissions for "others".
As mentioned above, for the AFS file
to be visible by a WWW server it is not sufficient to have the
correct standard Unix permissions - the directory must have also
set the AFS-specific permissions. Please check them by
fs listacl ~/www/
and if in the answer you see the line:
(lookup permission only - no read),
or when there is no line with
system:anyuser at all,
then enter the command:
fs setacl ~/www/ system:anyuser rl cern:nodes rl
Checking again like above you should see this being accepted and both
read and lookup permissions set.
Look here for more ample informations.
- DELPHI news
- Accessing the expired news items
I need to re-read the news item which existed a few days ago,
but has apparently expired since.
Is there any way that I can still find it?
There are at present 2 ways of doing it.
One is using the
standard news page,
but it requires the knowledge of a folder name of the news item you
are interested in. If you do know that, select option
"Search a string in the news".
Then change the button "Active news" to "Archived and Active news"
and in the next field enter the exact name of the folder
(delete the asterisk, as the wild-cards are not allowed when
searching archived news). Finally enter the search string and where it appears
(in description=subject, author line or entire text).
Note that the matching is very simple (just a string within single line).
The other method can be done only on VAX.
You should log to AXDEOF cluster (old VXDEL1) and enter the command
Once inside, issue the command
If you don't remember the folder name (news group), do
and you will be shown all available folders.
and browse through the list of all items
(you may limit the list by giving the author and/or the subject
- see the online
Once you find the requested item, just enter its number -
it will be displayed.
You may save it be entering
EXTRACT file.name .
When you finish, enter
EXIT to quit the VAXNEWS program.
- Printing at CERN
Which printers can we use at CERN and what is the best print command
lp/lpr doesn't quite work)?
CERN has developed own printer commands (usually called
xprint or such).
Please see here
for a compilation of available printers in main areas of our experiment and
commands to be used.
You didn't quite find what you were looking for?
Send us a mail,
and we will try to provide you with an answer!
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- DELPHI home page
February '98 (and continuously since then...)