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ASP GAU Account & Supercomputing Access. Gabriele Pfister. NCAR’s S cientific C omputing D ivision SCD's goal is to enable the best atmospheric research in the world by providing and advancing high-performance computing technologies.

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ASP GAU Account & Supercomputing Access

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ASP GAU Account

&

Supercomputing Access

Gabriele Pfister


NCAR’s Scientific Computing Division

SCD's goal is to enable the best atmospheric research in the world by providing and advancing high-performance computing technologies.

SCD offers computing, research datasets, data storage, networking, and data analysis tools to advance NCAR's scientific research agenda.

Webpage: www.scd.ucar.edu


Computer Architectures (I)

SCD’s machines are UNIX-based parallel computing architectures

Production Supercomputing Systems run tasks such as large simulations or models that require massive computing and data-handling resources.

Bluesky

IBM Cluster 1600 running AIX

Lightning

IBM e1350 cluster running Linux

Data Analysis and Visualization Systems support data preprocessing prior to a job run and data postprocessing after a run

Tempest (SGI Origin3800 running IRIX)


Computer Architectures (II)

Mass Storage System (MSS)

NCAR's Mass Storage System is a central, large-scale data archive that stores data used and generated by climate models and other programs executed on NCAR's compute servers.

On 21 July 2004,

NCAR's MSS surpassed

2 petabytes of data storage.

Some of the data stored on the MSS originate from field experiments and observations, however, the bulk of the data is generated by global climate-simulation models, mesoscale weather models, and other earth-science models that run on supercomputer.


  • ASP GAU Resources

  • A GAU (General Accounting Unit) is a measure for compute time on the supercomputers

  • ASP has a monthly allocation of 2000 GAUs

  • Access to these machines require

    • SCD login account

    • GAU account (e.g. contact Maura concerning the ASP account)

    • ssh environment

    • crypto card (for secure access)

  • GAUs: Use it or lose it - strategy

  • Resources are shared among ASP postdocs (and some graduate fellows)

  • Distribution is flexible and will be discussed regularly, e.g. monthly, either via meetings or e-mail discussions ([email protected])

Note: GAUs are also charged for storing files in the mass storage system (MSS) or file transfers from/to MSS to/from other machines


ASP GAU account

ASP GAU account number: 54042108 (also known as “project number”)

Needs to be specified in the batch scripts

ASP account number is NOT your default account number

Therefore: everybody needs a second (default) GAU account

(e.g. divisional GAU account)

University account - small request form for 1500 GAUs

http://www.scd.ucar.edu/resources/compServ.html

These GAUs do not expire every month, one-time allocation


Example: IBM Job Script

# @ job_name = mz4.3.noaa_frc_xnox_RF_2

# @ job_type = parallel

# @ account_no = 54042108

# @ ja_report = yes

# @ output = $(job_name).out

# @ error = $(job_name).err

# @ wall_clock_limit = 2000

# @ node_usage = not_shared

# @ network.MPI = csss,not_shared,us

# @ node = 2

# @ total_tasks = 16

# @ class = com_ec32

Stand-by (sb)

Economy (ec)

Regular (rg)

Priority (pr)

32- or 8-processor nodes


How to check GAU Status and Usage?

MySCDPortal

https://www.portal.scd.ucar.edu:8443/scd-portal

CIT username and password for login


Information on SCD’s Machines

User Manuals for computing facilities and mass storage system

SCD’s Support and Consulting Services

SCD’s consulting group: possible to get help on the weekends

or in the evenings (email)

Email: [email protected]

Phone: 303 497 1278

SCD’s Daily Bulletin (machine downtimes, etc.)

www.scd.ucar.edu


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