PDSF - General

From Computing@RNC

Revision as of 00:36, 8 October 2009

My password no longer works at PDSF

• I miss-typed the password three (or more) times

For security reasons, NERSC will *lock out* an account that has three or more failed login attempts. The lock out will last *12 hours*. If this happens to you, contact NERSC account support (1-800-666-3772, option #2) to have it reset.

• It's been a while, and I can't remember my password

Please call NERSC account support (1-800-666-3772, option #2) to have your password reset. Note, if you have not logged in for a long time (~6 months) your account may be deactiviated. If this is the case, NERSC account support will ask that you re-submit your signed NERSC User Agreement.

How to create & access individual web content on PDSF

• Current & Future Model

  * static content put under group writeable area: /project/projectdirs/star/www/ 
  * accessed by http://portal.nersc.gov/project/star/
  * Please add your own user area subdirectory - e.g. http://portal.nersc.gov/project/star/username 
  * there will not be a system wide migration;  each user should migrate their own web area.
  * static html only (e.g. dynamic content must be pre-generated )

• Old model is Deprecated

  * static content put into $HOME/public_html 
  * accessible via http://pdsfweb01.nersc.gov/~username

How to use IO resources of networked file systems (*eliza*)

The networked file systems on PDSF are visible from both interactive (pdsf.nersc.gov) and batch nodes. Batch processes should always specify an IO resource in the job description. The star scheduler handles this more or less automatically. For explicit job submission, use:

    qsub -hard -l elizaXXio=1 [script]

Where -l elizaXXio=1 identifies the network resources IO (XX should be a number of the eliza system) being accessed by the job and assigns a resource limit of 1. Failure to supply resource limits explicitly can cause your jobs to take a larger fraction of an IO resource, degrading it's overall performance to the detriment of everyone.

Users who abuse the limits will have their use of the system limited more directly. If you over-specify your resource needs, your job will likely not run. For example, if you just always submit with say, -l eliza1io=1,eliza8io=1,eliza9io=1, because you've used those resources in the past, you will find that your jobs can wait in the queue for a long time until all of those resources become free at the same time.

For more information about setting io resource usage, please see this PDSF FAQ entry.

How Can I tell if a Resource is used up?

Consumable resources in SGE on PDSF (known as complexes) are configured globally but are requested by host. Thus to determine if a resource is available you can use the SGE qhost command specified by any host known to the system. SGE will report the value of that resource common to any host.

  qhost -F eliza8io,eliza9io,eliza13io -h pc1008

will produce output showing the availability of these io resources. If any are 0.0000, then the resource is being used up. If any are greater than 0, then new jobs can access these resources.