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Hopper II available for early users

November 17, 2010 by Katie Antypas

Early user accounts are enabled on the Hopper Phase II system which is NERSC's first peta-flop machine.  It has 6392 nodes (over 150,000 processor cores) and uses the new gemini interconnect.  We invite you to run on the Hopper II system free of charge in exchange for providing feedback to NERSC staff about your experiences using Hopper II.   Please report any problems to the consultants at  Cray staff are continuing to make improvements to the system and we are sharing the early user time with them.  We will keep the MOTD up to date to show when the system is available to run users jobs:

If you have not logged into Hopper2 before, you can get to the system through another NERSC system like Franklin or Carver with the command:


Early Hopper phase II system documentation is located here.

You will have to enter your NIM username and password to see the new documentation.  Note that this site should only be used to view Hopper2 documentation.  The main NERSC website should still be used for all other systems and services.

Please remember this is an early system which has not yet been accepted by NERSC.  The software environment is not complete and Cray is still making improvements on the system.  Support may be limited.  Additionally, as an early user on the system you agree to do the following:

** Report all bugs, problems, and usability issues you have with the system to

** Report the performance of your code and your experience using Hopper to

** Not publish any machine performance results without the consent of NERSC. It is OK to publish science results, but since the machine has not yet been accepted we can not release information about specific code performance or I/O performance as Cray is still making configuration improvements.

** Understand that your job may be aborted at any time if Cray or NERSC staff need to do testing or maintenance on the system.

** Back up your data often. The file systems will not be backed up and the file systems could be reformatted with little or no warning.


Katie Antypas
NERSC User Services