HPC

2014/04 - Invited talk: MVAPICH

The April 2014 HPC Tech Talk (Tuesday, April 22th from 4-5PM) will provide some brief OSC updates, have a user-driven Q&A session, and will close with an invited talk about MPI-3 from the MVAPICH developers from The Ohio State University. To get the WebEX information and add a calendar entry, go here. Slides will be made available.

Charging for memory use

The only resource OSC currently charges for on batch jobs is processor use. We are considering a modification to our charging policy to reflect the fact that memory is also a scarce resource that should be accounted for in resource usage charges. The proposed change affects only Oakley jobs that request more than 4GB memory per processor (core).

The Executive Committee of the Statewide Users Group (SUG) has endorsed this proposal. A final decision will be made following a public comment period (see below).

2014/03 - OSC OnDemand

The March 2014 HPC Tech Talk (Tuesday, March 18th from 4-5PM) will provide some brief OSC updates, have a user-driven Q&A session, and will close with a live demonstration of OSC's OnDemand service. You can register for the WebEX session here. Slides are available below.

Queues and Reservations

Here are the queues available on Glenn. Please note that you will be routed to the appropriate queue based on your walltime and job size request.

Name Nodes available max walltime max job size notes

Serial

Available minus reservations

168 hours

1 node

 

Queues and Reservations

Here are the queues available on Oakley. Please note that you will be routed to the appropriate queue based on your walltime and job size request.

Name Nodes available max walltime max job size notes

Serial

Available minus reservations

168 hours

1 node

 

Managing Your Project

Principal Investigators of OSC projects are responsible for updating their authorized user list, their outside funding sources, and their publications and presentations that acknowledge OSC. All of these tasks can be accomplished through the ARMSTRONG portal (https://armstrong.osc.edu). PIs are also responsible for monitoring their project's Resource Unit balance and for submitting a proposal to the Allocations Committee of the Statewide Users Group before the balance goes negative.

HOWTO: Use VNC in a batch job

SSHing directly to a compute node at OSC - even if that node has been assigned to you in a current batch job - and starting VNC is an "unsafe" thing to do. When your batch job ends (and the node is assigned to other users), stray processes will be left behind and negatively impact other users. However, it is possible to use VNC on compute nodes safely.

Ruby

Ruby is currently unavailable for general access.

The Ruby Transitional Cluster is a limited-access test cluster to explore Intel Xeon Phi accelerators and ideas we want to consider for our next production cluster. Ruby has 8 compute nodes, each with one Phi card.

NB: Ruby is currently a very dynamic environment, and changes are happening frequently as we continue development.

 

UNIX Basics

OSC HPC resources use an operating system called "Linux", which is a UNIX-based operating system, first released on 5 October 1991. Linux is by a wide margin the most popular operating system choice for supercomputing, with over 90% of the Top 500 list running some variant of it. In fact, many common devices run Linux variant operating systems, including game consoles, tablets, routers, and even Android-based smartphones.

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