
Chapter 2. Using the Cray T3E at CSC 17
Interactive jobs can use at maximum 16 processors and 30 min parallel
CPU time.
2.5 Executing in batch mode
The batch jobs on all CSC’s computers are handled by the NQE system
(Network Queuing Environment). A more detailed description of this
system is given in Chapter 8 (page 81).
You can run a batch job by submitting an NQE request, which is a shell
script that contains NQE commands and options, shell commands, and
input data. At the moment, batch requests have to be submitted locally
on the Cray T3E with the command:
qsub [-l mpp_p=number]
[-l mpp_t=time]
[-l p_mpp_t=ptime]
[options] script
Resource specifications (option -l)are:
Option Meaning
-l mpp_p=number Number of PEs to be used within a job
-l mpp_t=time Maximum execution time of
all the programs in the script.
The time should be given in the formats
hh:mm:ss, mm:ss or ss.
-l p_mpp_t=ptime Maximum processing time of any
single program in the script.
Other typical options are:
Option Meaning
-r request_name Specific name for the batch job request
-q queue_name Batch queue name where the job should be run
-lT time Maximum single processor time for the job
to be run (hh:mm:ss).
-eo Concatenate stderr output to stdout
-o filename Specific script output file
The argument script of the qsub command is a file, which contains the
Unix commands to be executed. If omitted, standard input will be used.
Before executing the commands in the script, the batch system uses
your default shell to log in to the T3E. This sets up your normal user
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