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This list is used for ALL announcements to Hyak users, so please sign up. Important Hyak announcements are ONLY sent to this list, not to the individual Hyak accounts.


You can get to this top level page using the address:

System Status

Hyak consists of two independent clusters: ikt.hyak (hyak classic) and 1 cluster: mox.hyak (hyak next-genthe 2nd generation hyak system).

Current Status

titleIkt: Online

iktmox.Hyak is operating normally

titleMox: Online

mox.Hyak is operating normally

Monthly Scheduled Maintenance


*A maintenance reservation is in place for scheduled maintenance on October 13th, 2020.

*When a maintenance reservation is in place, jobs whose time limit (sbatch --time parameter) could allow the job to extend into the maintenance period will not be allowed to start by the scheduler.  The squeue command will show the reason as 'ReqNodeNotAvail'.

Hyak will be offline from 9:00 am - 5:00 pm for scheduled maintenance the second Tuesday of every month. Every third month (Feb, May, Aug, Nov), the maintenance window will last from 9:00 am to 9:00 the following morning. More on the Maintenance schedule.

Other maintenance performed on Hyak is relatively rare, short (30 - 60 minutes), and does not impact running jobs. This type of maintenance is announced to the hyak-users list.

Cluster Node Status

We run the Ganglia cluster status tool on ikt.hyak. Here you can find out the details about the CPU, memory, and network usage of the nodes in your allocation. (Ganglia does not run on mox.hyak.)

Hyak Overview

Hyak is a service of UW-IT. You can read more about it in the Service Catalog.This link at this link

This link describes how to get an Hyak account: Requesting an Account

This link has information about of some the research groups which use Hyak: Hyak_Research


Any UW student can get access to hyak by joining the HPC RC club: http

RC Club office hours:

Hyak consists of two independent clusters: ikt.hyak (hyak classic) and 1 cluster: mox.hyak (hyak next-gen). All new nodes are added to mox.hyak.


ikt.hyak has hundreds of nodes, each comparable to a high-end server. A typical node on ikt.hyak has 16 processor cores and at least 64GB of memory. All the ikt.hyak nodes run CentOS 6 Linux, and they are tied together by the Slurm cluster software. The user tasks are submitted through Slurm scheduler. ikt.Hyak is made of several generations of hardware with different levels of performance, see Hyak Node Hardware for more detailsthe 2nd generation Hyak system).


mox.hyak contains hundreds of nodes, each comparable to a high-end server. A typical node on mox.hyak has at least 28 processor cores and at least 128GB of memory. All the mox.hyak nodes run CentOS 7 Linux, and they are tied together by the Slurm cluster software. The user tasks are submitted through the Slurm scheduler.

For an overview of mox please see Hyak mox Overview.


CPU and storage options are available for purchase to Hyak users associated with sponsored campus units. New nodes will be part of mox.hyak.Non-sponsored campus units are able to purchase dedicated compute or storage capacity with an added annual maintenance cost.

This information is provided for preliminary planing purposes only. Please use your UW e-mail to  contact for assistance in preparing actual Hyak hardware configurations.

Any faculty or PI can send an e-mail to and request a "Welcome to Hyak Tutorial" to be held at their lab or department.

Getting Started

Please review everything in this section before contacting Hyak support for help with new accounts. This section also contains useful information on life with two-factor authentication, including setting up SSH tunnels to reduce hassles.


All Hyak use is mediated by the system scheduler. This section provides details on using the scheduler to run interactive, batch, and parallel jobs. It also includes instructions for using the scheduler to monitor your jobs and the cluster status.

ikt.hyak uses the slurm scheduler. Jobs must be submitted via login nodes.

mox.hyak uses the slurm scheduler. Jobs must be submitted via the login nodes.

Below The page below is for both ikt.hyak and mox.hyak.



Getting Help

If you use the STF (Student Technology Fee) allocation through the Research Computing Club (RCC), please join the mailing list for the HPC club RCC (http and direct all questions there. Do not contact UW-IT for support.

The principle means of support we provide is this Wiki - a comprehensive set of documentation covering all basic Hyak functions. If you encounter problems with one of Hyak's basic functions use your UW e-mail to send an e-mail to with 'hyak' as the first word in the subject and a brief description of your issue. If you do not use your UW provided e-mail account, please include your UW NetID in your e-mail. If you're reporting a problem with a job or the job scheduler, please include at least one affected jobid as well as paths to the job script and job stdout.

RC Club Office Hours:

We operate Hyak as a campus resource for research computing at scale. It provides a capable, stable platform upon which users can build complex, domain specific software environments and workflows. Our end-user support resources are limited, covering the system hardware, operating system, filesystems, networks, job scheduler, and a defined set of development tools and applications. Users are responsible for building, installing, maintaining and running any other applications.


  • Hyak HOWTO is a list of articles for different tasks, including how to use RPython, Python Matlab and Matlab R on hyak.



Hyak wiki pages Index



  • This work was facilitated though through the use of advanced computational, storage, and networking infrastructure provided by the Hyak supercomputer system at the University of Washington

When you cite Hyak, please let us know! Send Please use your UW e-mail to send mail to with Hyak as the first word in the subject along with a citation we can use in the body of the message. Likewise please let know of successful funding proposals and research collaborations which relied, at least in part, on Hyak for their success.