Program Execution Modes and Resource Limits

The modes of compiling/linking/executing programs fall into the two categories: Interactive Processing and Batch Processing.

In the interactive processing mode, a user types commands and each command performs a processing such as compiling a source program or executing an executable program in an interactive manner. This mode is suitable for compilation, or execution of small-scale programs.

In the batch processing mode, a user creates a Job Script File describing a sequence of multiple program executions, and make the computer do the job in one shot. This mode is suitable for the execution of programs such as those which require a large memory space or which invoke many parallel processes.

Resource Limits

• ♦ If the batch script file does not specify the maximum computing (elapse) time, the default value is "1h".
• ito-qq/ito-q/ito-q-dbg may accommodate multiple jobs in a single node.
• A computing time is the total CPU time for the interactive processing mode, while it is the elapsed time for the batch processing mode.
• In the batch processing mode, Up to 36 threads per node can be invoked.
• MPI must be employed for distributed-parallel execution which spans over multiple nodes. Each node can execute multiple flat processes up to the number of its cores.
• Parallel processing in the interactive mode shares the same node with other processes (users). The performance may vary from time to time
• Note that a Unix-traditional command execution style, in which an "&" sign is appended to the tail of the command line, is not a batch processing but an interactive processing.

How to Check Your Disk Usage

The following command will show you the disk usage of a specified user group.

$ lfs quota -g group /home
Disk quotas for user username (uid XXXXX):
     Filesystem  kbytes   quota   limit   grace   files   quota   limit   grace
          /home 10539640       0       0       -   12904       0       0       -
Disk quotas for group groupname (gid XXXXX):
     Filesystem  kbytes   quota   limit   grace   files   quota   limit   grace
          /home 10539640  30601641984 30601641984       -   12904  80000000 100000000       -

The following command will show you the disk usage (size/#files) of individual users in the same group.

$ qrepquota
Disk quotas for members of group groupname (gid XXXXX):
     Filesystem  kbytes   quota   limit   grace   files   quota   limit   grace
          /home 814004844     0       0       -  151960       0       0       -     ［XXXXXXX］
          /home 520979884     0       0       -   34923       0       0       -     ［*******］
          /home 216595264     0       0       -   23694       0       0       -     ［*******］
          /home 1220582912    0       0       -  268025       0       0       -     ［*******］
          /home 138331992     0       0       -    5356       0       0       -     ［*******］
          /home 29252740      0       0       -  184276       0       0       -     ［*******］

Disk quotas for group groupname (gid XXXXX):
     Filesystem  kbytes   quota   limit   grace   files   quota   limit   grace
          /home 90117296  10737418240 10737418240       -   32469  8000000 10000000       -

• The usage of masked accounts is the sum of the used spaces if the account belongs to multiple groups. If the group manager wishes to look into the masked part of the group, please contact us.
• If the free disk space of the whole system becomes too tight, we may ask you to delete or relocate some of your files before your disk usage reaches your limits.
• If the member accounts of a group are changed due to the changing/leaving of some member, the disk usage of the past member may not be displayed. If you wish to know the usage of a past user, please send an e-mail of inquiry containing the group name and the user name to the following contact address.

Contact Details

National Joint Use Section of Supercomputers,
Information Technology Infrastructure Division,
Information Systems Department,
Kyushu University
744 Moto-oka, Nishi-ku, Fukuoka 819-0395
Mail: