SGI Altix Accounting FAQ

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• How can I apply for an HPC account?
• The expiration date for my account is approaching, however I still have service units remaining, can my account be extended?
• How many service units (SU) have I used? How many remain?
• Can I get a detailed report of my SU Usage?
• How do I grant access to my directories/files to another user?
• I get the error message "tgusage: Command not found." when I try to use the tgusage command.
• What is NCSA's refund policy for lost jobs?
• Is there a way to set my default project?

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How can I apply for an HPC account?

See information at The Allocation Process.

The expiration date for my project is approaching, however I still have service units remaining, can my project be extended?

See information at Account Termination, Renewals, and Extensions.

How many service units (SU) have I used? How many remain?

See information at Verifying Your Account Balance.

Can I get a detailed report of my SU Usage?

See information at Verifying Your Account Balance.

How do I grant access to my directories/files to another user?

The chmod command is used to set the permissions to grant or restrict access to your directories/files.
To grant file access to another user, set the permissions so that ...

- all files to be shared, are set to world readable
- all directories, starting at your home directory down to the directory where the files are located should be set to world readable and world executable

Permissions can be set on a group of files, by using wildcards("*" and/or "?") for files that have a common pattern in the filename, or set permissions recursively for all directories/files under and including a parent directory, by using the "-R" option.
• chmod a+r *.txt
  
• chmod -R a+rX /u/ac/jsmith/sub_dir01

To unset the world permissions that were set with the commands listed above use o-.
• chmod o-r *.txt
  
• chmod -R o-rX /u/ac/jsmith/sub_dir01
respectively.

See the man pages for the chmod command for more info.

Note: Default permission on user's home directories are world executable, which allows a pass through behavior. These permissions will restrict anyone from listing the contents of the owner's home directory, but will allow a requester to list a specific target file or sub-directory's contents provided, the owner gives the requester the exact path to the target file or directory and that the permission have been set on the targets to enable access for the user who has requested access to the targets.

For additional info on setting permissions on directories/files you can find several online tutorials like

Wikipedia - chmod
Linux Ownership and Permissions Lab
Tutorial for chmod
Modify User Permissions

I get the error message "tgusage: Command not found." when I try to use the tgusage command.

This is probably because you do not have the current system environment.

If you haven't customized your $HOME/.soft file, delete this file, log off and log back on. A new .soft file with the current system environment will be created for you.

If you have customized your .soft file, replace the softenv macros in the file (such as @default, @teragrid) with:

   @teragrid-basic
   @globus-4.0
   @teragrid-dev

Then issue the command resoft or log off and log back on for the changes to take effect.

What is NCSA's refund policy for lost jobs?

NCSA's refund policy is described in the HPC Account Management web page.

Is there a way to set my default project?

See information at Setting Projects for Charging.

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