# Cylc **URL:** https://cylc.discourse.group/c/cylc/5.md?page=1 [Latest](https://cylc.discourse.group/latest.md) · [Categories](https://cylc.discourse.group/categories.md) **Page:** 2 --- ## [Annotated Cylc examples (physics‑motivated, work in progress)](https://cylc.discourse.group/t/annotated-cylc-examples-physics-motivated-work-in-progress/1314)
**Author:** [@BHFock](https://cylc.discourse.group/u/BHFock)\ **Replies:** 1\ **Last updated:** [May 5, 2026, 8:40am UTC](https://cylc.discourse.group/t/annotated-cylc-examples-physics-motivated-work-in-progress/1314 "2026-05-05T08:40:36Z")
As I’ve been getting back into Cylc, I started collecting some annotated examples to help myself remember the syntax and common patterns. The examples are physics‑motivated, but the structure is general enough that they … --- ## [Help with understanding cylc documentation](https://cylc.discourse.group/t/help-with-understanding-cylc-documentation/1312)
**Author:** [@bpabla50](https://cylc.discourse.group/u/bpabla50)\ **Replies:** 2\ **Last updated:** [April 30, 2026, 6:35pm UTC](https://cylc.discourse.group/t/help-with-understanding-cylc-documentation/1312 "2026-04-30T18:35:20Z")
I must admit that I have not read cylc documentation from start, but from time to time I consult pages, what I need for cylc8. My confusion is that, if I look at given page of documentation/examples, I don’t know, which… --- ## [Advice on how to parametrize the environment](https://cylc.discourse.group/t/advice-on-how-to-parametrize-the-environment/1313)
**Author:** [@sparonuz](https://cylc.discourse.group/u/sparonuz)\ **Replies:** 3\ **Last updated:** [April 29, 2026, 2:24pm UTC](https://cylc.discourse.group/t/advice-on-how-to-parametrize-the-environment/1313 "2026-04-29T14:24:29Z")
Hi everyone, I am using cylc 8.6.0. I created a simple cylc workflow that runs a model on a given HPC, let’s call it Platform1. Now: half of our users have an account on Platform1, but the other half uses another HPC,… --- ## [TUI/GUI not updating live – uiserver registers workflow as False](https://cylc.discourse.group/t/tui-gui-not-updating-live-uiserver-registers-workflow-as-false/1298)
**Author:** [@BHFock](https://cylc.discourse.group/u/BHFock)\ **Replies:** 19\ **Last updated:** [April 27, 2026, 1:25pm UTC](https://cylc.discourse.group/t/tui-gui-not-updating-live-uiserver-registers-workflow-as-false/1298 "2026-04-27T13:25:53Z")
Hi all, Long-time Cylc user here, previously at the Met Office. I’m now at a new organisation and working on my first proper Cylc installation (I’ve only ever used it as an end user, or run it on my personal laptop wher… --- ## [Cylc gui display disappears after workflow is completed](https://cylc.discourse.group/t/cylc-gui-display-disappears-after-workflow-is-completed/1308)
**Author:** [@bpabla50](https://cylc.discourse.group/u/bpabla50)\ **Replies:** 6\ **Last updated:** [April 23, 2026, 6:56am UTC](https://cylc.discourse.group/t/cylc-gui-display-disappears-after-workflow-is-completed/1308 "2026-04-23T06:56:04Z")
I am new to cylc gui(8.6.3). A few questions: a) display of workflow disappears quickly in browser window as soon as workflow is finished. Is there any way to force it to get displayed there forever? b) any way to show… --- ## [Cylc reinstall doesn't transfer over my new file](https://cylc.discourse.group/t/cylc-reinstall-doesnt-transfer-over-my-new-file/1309)
**Author:** [@jonnyhtwilliams](https://cylc.discourse.group/u/jonnyhtwilliams)\ **Replies:** 4\ **Last updated:** [April 21, 2026, 11:29am UTC](https://cylc.discourse.group/t/cylc-reinstall-doesnt-transfer-over-my-new-file/1309 "2026-04-21T11:29:31Z")
Hi there. I am porting a workflow to a new architecture and want to add a new site file in the (pre-existing) ~/roses/\[workflow\]/app/install\_ancil/opt/ directory. Running fcm status shows the new file… fcm st ? … --- ## [Using integer cycling to process many data files](https://cylc.discourse.group/t/using-integer-cycling-to-process-many-data-files/1310)
**Author:** [@hilary.j.oliver](https://cylc.discourse.group/u/hilary.j.oliver)\ **Replies:** 0\ **Last updated:** [April 21, 2026, 12:44am UTC](https://cylc.discourse.group/t/using-integer-cycling-to-process-many-data-files/1310 "2026-04-21T00:44:29Z")
If anyone’s interested, here’s a simple “Cylc 101” documented example - used for training at Earthsciences NZ recently - of how to automate the processing of many data files with Cylc. The full workflow config for pr… --- ## [Cylc gui error on MacOS Tahoe](https://cylc.discourse.group/t/cylc-gui-error-on-macos-tahoe/1305)
**Author:** [@gturek](https://cylc.discourse.group/u/gturek)\ **Replies:** 1\ **Last updated:** [April 9, 2026, 10:10am UTC](https://cylc.discourse.group/t/cylc-gui-error-on-macos-tahoe/1305 "2026-04-09T10:10:57Z")
Hi there, I am running cylc-flow 8.6.3 and cylc-uiserver 1.8.4 and I cannot view any of the logs. This is a screenshot of what I get: Worked fine before upgrade. Gaby --- ## [Please help with cycling behaviour](https://cylc.discourse.group/t/please-help-with-cycling-behaviour/1304)
**Author:** [@gturek](https://cylc.discourse.group/u/gturek)\ **Replies:** 2\ **Last updated:** [April 9, 2026, 9:37am UTC](https://cylc.discourse.group/t/please-help-with-cycling-behaviour/1304 "2026-04-09T09:37:21Z")
Hello, please help me understand this behaviour. I have a test workflow that is supposed to run every monday and wednesday, with the restart files of the previous run. \[ scheduling \] initial cycle point = 20260323 … --- ## [Cylc 8.6.2 how to grab execution time limit as variable](https://cylc.discourse.group/t/cylc-8-6-2-how-to-grab-execution-time-limit-as-variable/1294)
**Author:** [@hollabigj](https://cylc.discourse.group/u/hollabigj)\ **Replies:** 12\ **Last updated:** [March 19, 2026, 10:14pm UTC](https://cylc.discourse.group/t/cylc-8-6-2-how-to-grab-execution-time-limit-as-variable/1294 "2026-03-19T22:14:22Z")
execution time limit = 15m How do we grab that execution time limit and pass on to the other script for conditional check against age and time. IE ${CYLC\_TIME…} Thanks. --- ## [Mixing cycle and interval scheduling results in stall](https://cylc.discourse.group/t/mixing-cycle-and-interval-scheduling-results-in-stall/1299)
**Author:** [@srennie](https://cylc.discourse.group/u/srennie)\ **Replies:** 6\ **Last updated:** [March 18, 2026, 4:05am UTC](https://cylc.discourse.group/t/mixing-cycle-and-interval-scheduling-results-in-stall/1299 "2026-03-18T04:05:07Z")
My workflow keeps stalling after it hits a cycle with a cycle-specific dependency. Minimal example (hopefully transcribed correctly) \[scheduler\] \[scheduling\] initial cycle point = 20230101T06 final cycle point … --- ## [Handling run host swaps in operational environment](https://cylc.discourse.group/t/handling-run-host-swaps-in-operational-environment/1296)
**Author:** [@gturek](https://cylc.discourse.group/u/gturek)\ **Replies:** 13\ **Last updated:** [March 17, 2026, 10:49am UTC](https://cylc.discourse.group/t/handling-run-host-swaps-in-operational-environment/1296 "2026-03-17T10:49:39Z")
Kia ora! In our operational environment, Meteo France has the purview to swap where our pipelines are running at any time between two systems named belenos and taranis (see gallic gods). I need to come up with a new proc… --- ## [Suggestions sought for handling complex workflow](https://cylc.discourse.group/t/suggestions-sought-for-handling-complex-workflow/1286)
**Author:** [@gturek](https://cylc.discourse.group/u/gturek)\ **Replies:** 10\ **Last updated:** [March 10, 2026, 10:01am UTC](https://cylc.discourse.group/t/suggestions-sought-for-handling-complex-workflow/1286 "2026-03-10T10:01:34Z")
Hi all! We are in the process of verifying our first full workflow in order to put it in production (yey!), and I am already trying to figure out how to handle a variation of it. This workflow would be relatively eas… --- ## [Variable length task parameterisation](https://cylc.discourse.group/t/variable-length-task-parameterisation/1293)
**Author:** [@lispandfound](https://cylc.discourse.group/u/lispandfound)\ **Replies:** 4\ **Last updated:** [March 6, 2026, 2:38am UTC](https://cylc.discourse.group/t/variable-length-task-parameterisation/1293 "2026-03-06T02:38:51Z")
I have used cylc for a couple of years now to perform variations of workflows in ground motion simulations, where we are interested in simulating a number of events, with each event having a number of realisations. Reali… --- ## [Persistent web UI view and colour scheme?](https://cylc.discourse.group/t/persistent-web-ui-view-and-colour-scheme/1292)
**Author:** [@jonnyhtwilliams](https://cylc.discourse.group/u/jonnyhtwilliams)\ **Replies:** 10\ **Last updated:** [March 4, 2026, 3:24pm UTC](https://cylc.discourse.group/t/persistent-web-ui-view-and-colour-scheme/1292 "2026-03-04T15:24:39Z")
Hiya Is it possible to make the default view and/or colour scheme persistent across different sessions? for example I pretty much always want to use the graph view, grouped by cycle point and use the colour deficient sc… --- ## [Skip retries on specific message output](https://cylc.discourse.group/t/skip-retries-on-specific-message-output/1291)
**Author:** [@aulemahal](https://cylc.discourse.group/u/aulemahal)\ **Replies:** 1\ **Last updated:** [March 2, 2026, 2:50pm UTC](https://cylc.discourse.group/t/skip-retries-on-specific-message-output/1291 "2026-03-02T14:50:58Z")
Hi! I have a long-running task that often fails with random read errors. I have to fix this, but for the mean time I simply made it retry up to 3 times and in 99% of the cases it works on the second try. However, this … --- ## [Option to change order of click menu at task level](https://cylc.discourse.group/t/option-to-change-order-of-click-menu-at-task-level/1290)
**Author:** [@jonnyhtwilliams](https://cylc.discourse.group/u/jonnyhtwilliams)\ **Replies:** 2\ **Last updated:** [February 20, 2026, 4:36pm UTC](https://cylc.discourse.group/t/option-to-change-order-of-click-menu-at-task-level/1290 "2026-02-20T16:36:21Z")
Hi there. I’m working on a remote platform (ARCHER2 launched from PUMA2) which has task state polling every 5 minutes. I frequently need to poll tasks but need to press the SEE ALL option at the bottom of the menu to g… --- ## [Workflow programmer position at Mercator-Océan Int'l](https://cylc.discourse.group/t/workflow-programmer-position-at-mercator-ocean-intl/1289)
**Author:** [@gturek](https://cylc.discourse.group/u/gturek)\ **Replies:** 0\ **Last updated:** [February 19, 2026, 1:14pm UTC](https://cylc.discourse.group/t/workflow-programmer-position-at-mercator-ocean-intl/1289 "2026-02-19T13:14:58Z")
Mercator Ocean International is recruiting a Workflow Management Developer to strengthen its operational ocean forecasting systems. You will work at the core of scientific production chains to design, industrialise and m… --- ## [ApolloError: Response not successful: Received status code 403](https://cylc.discourse.group/t/apolloerror-response-not-successful-received-status-code-403/1288)
**Author:** [@gturek](https://cylc.discourse.group/u/gturek)\ **Replies:** 3\ **Last updated:** [February 13, 2026, 4:48pm UTC](https://cylc.discourse.group/t/apolloerror-response-not-successful-received-status-code-403/1288 "2026-02-13T16:48:15Z")
Hi there, I seem to get this error constantly when running cylc gui. In particular when I click on a different workflow on the sidebar However, there’s a caveat in my case. I’m accessing the jupyter server via a websock… --- ## [Kill task cylc 8.6.2](https://cylc.discourse.group/t/kill-task-cylc-8-6-2/1283)
**Author:** [@sparonuz](https://cylc.discourse.group/u/sparonuz)\ **Replies:** 14\ **Last updated:** [February 13, 2026, 1:14pm UTC](https://cylc.discourse.group/t/kill-task-cylc-8-6-2/1283 "2026-02-13T13:14:13Z")
Good afternoon, We recently udpated our cycl version to 8.6.2, and we noticed a change. Before, when from the tui you killed a task, running on a platform with job runner = slurm (so, basically a job running on compu… --- ## [\[issue\] platform not defined](https://cylc.discourse.group/t/issue-platform-not-defined/1285)
**Author:** [@Jerry](https://cylc.discourse.group/u/Jerry)\ **Replies:** 8\ **Last updated:** [February 2, 2026, 9:28am UTC](https://cylc.discourse.group/t/issue-platform-not-defined/1285 "2026-02-02T09:28:58Z")
Hi, I’m new to Cylc 8. Cylc 8.6.2 and rose 2.6.2 were installed to a centralized loation with command “pip3 install --user” I played examples extracted from the cylc.flow package with installed Cylc/rose environement… --- ## [Syntax and usage of 'cylc view'](https://cylc.discourse.group/t/syntax-and-usage-of-cylc-view/1279)
**Author:** [@jonnyhtwilliams](https://cylc.discourse.group/u/jonnyhtwilliams)\ **Replies:** 8\ **Last updated:** [January 22, 2026, 8:22pm UTC](https://cylc.discourse.group/t/syntax-and-usage-of-cylc-view/1279 "2026-01-22T20:22:33Z")
Hi there. In cylc view how can I make it explicitly show all the files which are being included by e.g. {% if TASK\_RUN and TASK\_TESTS %} {% include “site/” \\~ SITE \\~“-tests.cylc” %} {% endif %} I see there is this op… --- ## [Tip: UI Command Editor](https://cylc.discourse.group/t/tip-ui-command-editor/1284)
**Author:** [@oliver.sanders](https://cylc.discourse.group/u/oliver.sanders)\ **Replies:** 0\ **Last updated:** [January 22, 2026, 3:10pm UTC](https://cylc.discourse.group/t/tip-ui-command-editor/1284 "2026-01-22T15:10:25Z")
Added in version cylc-uiserver: 1.8.2 The “command editor” allows us to edit the options for a command before we issue it, it is opened from the context menu by pressing the pencil icon. There is now an option to open … --- ## [Trigger task at first and last Cycle point](https://cylc.discourse.group/t/trigger-task-at-first-and-last-cycle-point/1246)
**Author:** [@wxtim](https://cylc.discourse.group/u/wxtim)\ **Replies:** 0\ **Last updated:** [January 21, 2026, 11:22am UTC](https://cylc.discourse.group/t/trigger-task-at-first-and-last-cycle-point/1246 "2026-01-21T11:22:41Z")
:sparkles: Version Added: 8.6.0 The initial and final cycle points in a workflow can now be referenced in commands using the ^ and $ symbols, e.g: # trigger "mytask" at the initial cycle point cylc trigger mywork… --- ## [Tip: GUI searching and filtering](https://cylc.discourse.group/t/tip-gui-searching-and-filtering/1282)
**Author:** [@oliver.sanders](https://cylc.discourse.group/u/oliver.sanders)\ **Replies:** 0\ **Last updated:** [January 15, 2026, 5:12pm UTC](https://cylc.discourse.group/t/tip-gui-searching-and-filtering/1282 "2026-01-15T17:12:22Z")
The task filtering controls in the “Tree” and “Table” views have been overhauled in cylc-uiserver: 1.8.2 (for use with Cylc 8.6). Task name searching now supports globs, e.g foo\* matches all tasks beginning with foo and… --- ## [Include a task in all but the first cycle point](https://cylc.discourse.group/t/include-a-task-in-all-but-the-first-cycle-point/115)
**Author:** [@jonnyhtw](https://cylc.discourse.group/u/jonnyhtw)\ **Replies:** 6\ **Last updated:** [January 13, 2026, 3:40pm UTC](https://cylc.discourse.group/t/include-a-task-in-all-but-the-first-cycle-point/115 "2026-01-13T15:40:58Z")
Hi there In this section of the Cylc docs, it tells you how to include something in only the first cycle point of a suite. How would I include a task in every cycle apart from the first one? Thanks! Jonny --- ## [Tip: held and retry indicators in the workflows sidebar](https://cylc.discourse.group/t/tip-held-and-retry-indicators-in-the-workflows-sidebar/1280)
**Author:** [@oliver.sanders](https://cylc.discourse.group/u/oliver.sanders)\ **Replies:** 0\ **Last updated:** [January 12, 2026, 3:44pm UTC](https://cylc.discourse.group/t/tip-held-and-retry-indicators-in-the-workflows-sidebar/1280 "2026-01-12T15:44:37Z")
As of cylc-flow 8.6.2 and cylc-uiserver 1.8.2, the workflows sidebar in the GUI now displays indicators for held and retrying tasks. These icons will show if there are any held or retrying tasks in the active window … --- ## [Cylc job shebang](https://cylc.discourse.group/t/cylc-job-shebang/1273)
**Author:** [@sparonuz](https://cylc.discourse.group/u/sparonuz)\ **Replies:** 3\ **Last updated:** [December 17, 2025, 11:02pm UTC](https://cylc.discourse.group/t/cylc-job-shebang/1273 "2025-12-17T23:02:35Z")
Hi there, I have been struggling with a problem for quite sometimes, and since I can’t find my way out, let’s see if you can help me. In our workflow, one of the components is a bash script running a Fortran executable… --- ## [Question about cycling](https://cylc.discourse.group/t/question-about-cycling/1272)
**Author:** [@gturek](https://cylc.discourse.group/u/gturek)\ **Replies:** 2\ **Last updated:** [December 5, 2025, 10:00am UTC](https://cylc.discourse.group/t/question-about-cycling/1272 "2025-12-05T10:00:55Z")
Hi all, in certain situations I want to be able to run a workflow immediately, and then following a specific recursion formula, ie something like “R1 & R/+P5D/P7D” but this does not validate. What is the correct way to … --- ## [Cylc keepalive best practices](https://cylc.discourse.group/t/cylc-keepalive-best-practices/1271)
**Author:** [@ejhyer](https://cylc.discourse.group/u/ejhyer)\ **Replies:** 1\ **Last updated:** [December 5, 2025, 7:21am UTC](https://cylc.discourse.group/t/cylc-keepalive-best-practices/1271 "2025-12-05T07:21:25Z")
cylc-flow 8.4.2 pyh3a29b38\_0 conda-forge cylc-flow-base 8.4.2 pyh707e725\_0 conda-forge cylc-ui 1.0.0 ha770c72\_0 conda-forge H… [Previous page](https://cylc.discourse.group/c/cylc/5.md) [Next page](https://cylc.discourse.group/c/cylc/5.md?page=2)