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Center for High Throughput Computing

User News

Below is a list of important user news updates, sorted by date. Please stay up to date with news which is relevant to you, as CHTC policy changes may affect the jobs of users.

For older updates not shown on this page, see our user mailing list archives.

Announcing HTCondor Week 2018

Friday, March 30, 2018, 1:22 PM

Hi all,
(Second announcement of the day, and hopefully our last announcement for awhile!)

We would like to invite you to HTCondor Week 2018, HTCondor's annual user conference.

This year, HTCondor Week will be held May 21-24 at the Fluno Center on the UW Madison campus. We will have a variety of in-depth tutorials and talks where you can not only learn more about HTCondor, but you can also learn how other people are using and deploying HTCondor across the country and the world. Best of all, you can establish contacts and learn best practices from people in industry, government, and academia who are using HTCondor to solve hard problems, many of which may be similar to those you are facing. You'll also get a peek into our longer term development plans--something you can only get at HTCondor Week!

UW-Madison affiliates can attend tutorials on Monday, May 21 and research talks on Thursday, May 24 for FREE (without registering), but will otherwise need to register for the May 22-23 sessions and/or to partake in conference meals. If you have any questions about this, or HTCondor week in general, contact our usual support email at chtc@cs.wisc.edu.

You can register and see the agenda overview on the HTCondor Week 2018 site.

We hope to see you there!

The CHTC Team

OSG User School 2018: learn to harness large-scale computing for research

Friday, March 30, 2018, 08:50 AM

Greetings CHTC Users,

As we have in previous years, we invite you to apply to this year's Open Science Grid User School, which is held here at UW-Madison (details below). We accept a large number of UW-Madison researchers each year, so check out the short application form and let us know if you have any questions by emailing chtc@cs.wisc.edu.

Your CHTC Team


If you could access hundreds or even thousands of computers for your scholarly work, what could you do? How could it transform your work? What discoveries might you make?

We are seeking applicants for the Open Science Grid (OSG) User School 2018, which takes place July 9-13 at the beautiful University of Wisconsin in Madison. Participants will learn to use high throughput computing (HTC) to harness vast amounts of computing power for research, applicable to nearly any field of study (e.g., physics, chemistry, engineering, life sciences, earth sciences, agricultural and animal sciences, economics, social sciences, medicine, and more).

For more background:

Using lectures, discussions, roleplays, and lots of hands-on work with OSG experts in HTC, participants will learn how HTC systems work, how to run and manage many jobs and huge datasets, how to implement a realistic scientific computing workflow, and where to turn for help and more info.

Worried about costs? We pay all basic travel, hotel, and food costs for applicants who are selected to attend. This is a valuable offer!

Ideal candidates are graduate students whose research involves or could involve large-scale computing - work that cannot be done on one laptop or a handful of computers. Also, we accept some post-doctoral students, faculty, staff, and advanced undergraduates, so make a strong case for yourself regardless of your current role!

  Application Period (OPEN NOW): 15 March - 20 April 2018
  OSG User School: 9-13 July 2018

 Web: https://www.opensciencegrid.org/UserSchool
 Email: user-school@opensciencegrid.org
 Facebook: https://www.facebook.com/OSGUserSchool
 Twitter: https://twitter.com/OSGUserSchool

HPC Cluster back up

Wednesday, March 28, 2018, 10:55 AM

Greetings HPC cluster Users,

The HPC cluster is back up. Users with accounts on the cluster should be able to log in and submit jobs again. Quotas and files in the cluster home directories should be the same as they were before the downtime.

Please email us at chtc@cs.wisc.edu if you notice any issues with the cluster.

Your CHTC Team

HPC Cluster update: head nodes down

Monday, March 19, 2018, 10:04 AM

Greetings CHTC Users,

This message is for users of our HPC cluster. As some of you have noticed, the head nodes for the HPC cluster (aci-service-1.chtc.wisc.edu and aci-service-2.chtc.wisc.edu) are running extremely slowly -- it takes a long time to log in, and once logged in, even simple commands take a long time to complete. There is an underlying file system issue causing this behavior, which means that it will continue until our administrators can troubleshoot and address it.

Our administrators will be working on this issue as soon as they can. In the meantime, we recommend not using the head nodes, including but not limited to: logging in, transferring data, installing software or submitting new jobs. Jobs that have already been submitted should not be impacted.

We will send you updates via this email list when we have a significant update or when the issue is resolved. Individual queries can be sent to our support email, chtc@cs.wisc.edu.

Your CHTC Team

HPC cluster back up; new home directory quotas

Wednesday, March 14, 2018, 4:11 PM

Greetings CHTC Users,

The HPC cluster is back up and now has home directory quotas. If you are a user of the HPC cluster, please read on for more details.

There are now two home directory quotas for each user on the cluster: one that limits total space used and another that limits the number of files and directories contained in your home directory. The default starting quotas are 100GB and 50,000 files/directories per user. These default quotas are based on previous reports from the cluster and our best estimate of the size/file counts required for software installation and running jobs. Higher quotas will be available by request to chtc@cs.wisc.edu.

We recommend getting started by installing or copying back your software packages (if any) to the cluster. As you get re-started, do not have more than one data transfer process occurring through the head nodes (aci-service-1 or aci-service-2) at a time. If you determine that you will need higher quotas, please provide relevant details (size/number of files needed per job, number of software packages to be installed, files already in use in software packages, etc.) in email to chtc@cs.wisc.edu.

Information about the new quotas is also now available in our HPC Cluster Use Guide for your future reference, including instructions on how to check your current home directory usage of file sizes + file counts.

Thank you to all for your cooperation during this process as we seek to support all researchers by maintaining well-functioning systems.

Christina + the CHTC team.

CHTC support during March and April

Monday, March 12, 2018, 12:17 PM

Hello CHTC users,

This is a quick update on CHTC staffing for the months of March and April.

I (Christina) will be the sole research computing facilitator in the office for the next six weeks as Lauren is out on maternity leave. This means that our usual response time to emails/new account requests may be longer than usual, especially during busy periods or if I'm out of the office myself. I will not be emailing this chtc-users list about short outages (being away for an afternoon or single day) and will instead be updating our get help page with expected availability and response times.

We also have a new student assistant who started in February, so if you see emails from Youmin, know that he's working with us and that responses go to both him and myself.

Thanks in advance for your patience. Email chtc@cs.wisc.edu with any concerns or questions.

Christina Koch

P.S. If you'd like to pass on your congratulations to Lauren, I'll have a card at office hours during the month of March that anyone is welcome to sign. :)