# Cylc Support **URL:** https://cylc.discourse.group/c/cylc/cylc-support/9.md?page=2 [Latest](https://cylc.discourse.group/latest.md) · [Categories](https://cylc.discourse.group/categories.md) **Page:** 3 --- ## [Should \`@a | @b =\> c\` fail validation?](https://cylc.discourse.group/t/should-a-b-c-fail-validation/1178)
**Author:** [@TomC](https://cylc.discourse.group/u/TomC)\ **Replies:** 6\ **Last updated:** [August 27, 2025, 5:04am UTC](https://cylc.discourse.group/t/should-a-b-c-fail-validation/1178 "2025-08-27T05:04:39Z")
I just saw something that I didn’t expect. I believe it is still the case that you cannot have |(or) syntax for xtriggers. But, graph of @a | @b =\> c does not fail validation, it installs and runs. I believe it treats t… --- ## [Platfrom setup in global.cylc](https://cylc.discourse.group/t/platfrom-setup-in-global-cylc/1230)
**Author:** [@Sateesh\_Masabathini](https://cylc.discourse.group/u/Sateesh_Masabathini)\ **Replies:** 15\ **Last updated:** [August 25, 2025, 11:58am UTC](https://cylc.discourse.group/t/platfrom-setup-in-global-cylc/1230 "2025-08-25T11:58:19Z")
Hi group, My job, job.status are available in /scratch/masabas/bandwidth/cylc-run/…… and the job.err, job.out files are available here /scratch/masabas/cylc-run/… . My cylc is 8.5.1. ls /scratch/masabas/bandwidth/cylc… --- ## [Cylc cyclepoint and the letter "T"](https://cylc.discourse.group/t/cylc-cyclepoint-and-the-letter-t/1228)
**Author:** [@ejhyer](https://cylc.discourse.group/u/ejhyer)\ **Replies:** 4\ **Last updated:** [August 13, 2025, 1:26pm UTC](https://cylc.discourse.group/t/cylc-cyclepoint-and-the-letter-t/1228 "2025-08-13T13:26:16Z")
cylc 8.4.2 cylc 8.4.2 \> export CYLC\_TASK\_CYCLE\_POINT=20230120T0000Z \> cylc cyclepoint --offset-hours=0 --template="a string with %Y%m%d%H" a string with 2023012000 \> cylc cyclepoint --offset-hours=0 --template="a stri… --- ## [Use bash arrays in environment variables](https://cylc.discourse.group/t/use-bash-arrays-in-environment-variables/1227)
**Author:** [@sparonuz](https://cylc.discourse.group/u/sparonuz)\ **Replies:** 6\ **Last updated:** [August 8, 2025, 6:48am UTC](https://cylc.discourse.group/t/use-bash-arrays-in-environment-variables/1227 "2025-08-08T06:48:11Z")
Good Afternoon, In a cylc workflow I am trying to set an environment parameter with a bash array, like this: \[task parameters\] client\_number = 0, 1 \[ runtime \] \[\[client\_name\\]\] script = clie… --- ## [Translate Cylc 7 suicide triggers to Cylc 8](https://cylc.discourse.group/t/translate-cylc-7-suicide-triggers-to-cylc-8/1206)
**Author:** [@hollabigj](https://cylc.discourse.group/u/hollabigj)\ **Replies:** 9\ **Last updated:** [August 4, 2025, 10:19pm UTC](https://cylc.discourse.group/t/translate-cylc-7-suicide-triggers-to-cylc-8/1206 "2025-08-04T22:19:26Z")
Using Cylc 8.4.2 PBS batch I’m having a little bit tough time understanding the new graph branching for Cylc 8 that not require suicide triggers (without turn on backward compatibility) due to English is not my primary… --- ## [Roll back a flow and forget prior progress](https://cylc.discourse.group/t/roll-back-a-flow-and-forget-prior-progress/1202)
**Author:** [@Vve](https://cylc.discourse.group/u/Vve)\ **Replies:** 4\ **Last updated:** [July 10, 2025, 3:54pm UTC](https://cylc.discourse.group/t/roll-back-a-flow-and-forget-prior-progress/1202 "2025-07-10T15:54:59Z")
Hello, I’m running a set of two concurrent workflows that occasionally need to be rolled back to an earlier cycle point and re-run from there. I’m familiar with launching a new flow as a means of starting again from an … --- ## [Dedicated support options?](https://cylc.discourse.group/t/dedicated-support-options/1199)
**Author:** [@BHFock](https://cylc.discourse.group/u/BHFock)\ **Replies:** 0\ **Last updated:** [July 8, 2025, 1:40pm UTC](https://cylc.discourse.group/t/dedicated-support-options/1199 "2025-07-08T13:40:47Z")
Are there any current or upcoming projects that plan to offer dedicated support for organisations in Europe looking to adopt Cylc for Earth system modelling workflows, similar to what was provided under ESiWACE2? --- ## [Possible to send a message to the scheduler log?](https://cylc.discourse.group/t/possible-to-send-a-message-to-the-scheduler-log/1197)
**Author:** [@TomC](https://cylc.discourse.group/u/TomC)\ **Replies:** 4\ **Last updated:** [June 30, 2025, 2:36am UTC](https://cylc.discourse.group/t/possible-to-send-a-message-to-the-scheduler-log/1197 "2025-06-30T02:36:08Z")
Is there a way for a user or a task to send something to the scheduler log? cylc message appears to be tied to jobs, but I was thinking about just wanting to log something in the scheduler log for tracking purposes, not … --- ## [Stop a workflow from a cycle, killing future tasks](https://cylc.discourse.group/t/stop-a-workflow-from-a-cycle-killing-future-tasks/1196)
**Author:** [@TomC](https://cylc.discourse.group/u/TomC)\ **Replies:** 3\ **Last updated:** [June 24, 2025, 6:40am UTC](https://cylc.discourse.group/t/stop-a-workflow-from-a-cycle-killing-future-tasks/1196 "2025-06-24T06:40:44Z")
I was wondering if there was a neat way to do cylc stop workflow//20250601T0000Z, killing tasks which may be running after that cycle? I know you can do cylc kill on a glob pattern matching various cycles, but that is ex… --- ## [More interesting contact file behavior: GUI/daemon interactions?](https://cylc.discourse.group/t/more-interesting-contact-file-behavior-gui-daemon-interactions/1186)
**Author:** [@ejhyer](https://cylc.discourse.group/u/ejhyer)\ **Replies:** 9\ **Last updated:** [June 24, 2025, 12:44am UTC](https://cylc.discourse.group/t/more-interesting-contact-file-behavior-gui-daemon-interactions/1186 "2025-06-24T00:44:43Z")
cylc-flow 8.4.2 pyh3a29b38\_0 conda-forge cylc-flow-base 8.4.2 pyh707e725\_0 conda-forge cylc-uiserver 1.6.1 pyhd8ed1ab\_0 conda-forge c… --- ## [Run a task only once within jinja2 loop](https://cylc.discourse.group/t/run-a-task-only-once-within-jinja2-loop/1193)
**Author:** [@gturek](https://cylc.discourse.group/u/gturek)\ **Replies:** 3\ **Last updated:** [June 18, 2025, 12:24pm UTC](https://cylc.discourse.group/t/run-a-task-only-once-within-jinja2-loop/1193 "2025-06-18T12:24:41Z")
Hi, I have the following (simplified) situation summarized by this workflow: #!Jinja2 {% set casts=\['a','b','c'\] %} \[scheduler\] cycle point format = %Y%m%d \[scheduling\] initial cycle point = now final cycl… --- ## [What could stop job.status updating?](https://cylc.discourse.group/t/what-could-stop-job-status-updating/1192)
**Author:** [@TomC](https://cylc.discourse.group/u/TomC)\ **Replies:** 2\ **Last updated:** [June 17, 2025, 8:35am UTC](https://cylc.discourse.group/t/what-could-stop-job-status-updating/1192 "2025-06-17T08:35:45Z")
I’ve not seen this before, but I found a job.status file which never updated with INIT nor EXIT times. Nor is there a CYLC\_JOB\_EXIT=SUCCEEDED in there which I expected. $ cat job.status CYLC\_JOB\_RUNNER\_NAME=pbs CYLC\_JOB… --- ## [Any way to replay from broken task instead of playing from start?](https://cylc.discourse.group/t/any-way-to-replay-from-broken-task-instead-of-playing-from-start/1179)
**Author:** [@bpabla50](https://cylc.discourse.group/u/bpabla50)\ **Replies:** 5\ **Last updated:** [June 10, 2025, 11:30pm UTC](https://cylc.discourse.group/t/any-way-to-replay-from-broken-task-instead-of-playing-from-start/1179 "2025-06-10T23:30:44Z")
Can someone please suggest on these two sub topics: Suppose I have workflow like it installed in workflow/runname A =\>B =\>C =\>D1 =\>D2 =\>D3 , where D1-3 are the 3 instances of task D. In order to play : cylc play wor… --- ## [.service/contact file keeps getting deleted](https://cylc.discourse.group/t/service-contact-file-keeps-getting-deleted/1164)
**Author:** [@ejhyer](https://cylc.discourse.group/u/ejhyer)\ **Replies:** 10\ **Last updated:** [June 10, 2025, 5:25pm UTC](https://cylc.discourse.group/t/service-contact-file-keeps-getting-deleted/1164 "2025-06-10T17:25:00Z")
cylc 8.4.2 This problem is intermittent, but not sporadic-- when it’s happening, it happens to every suite I attempt to run. The observable symptom is that the suite switches itself to stopped after a few seconds. If I p… --- ## [Run Cylc gui on a different port](https://cylc.discourse.group/t/run-cylc-gui-on-a-different-port/1182)
**Author:** [@cazria](https://cylc.discourse.group/u/cazria)\ **Replies:** 2\ **Last updated:** [June 6, 2025, 8:41am UTC](https://cylc.discourse.group/t/run-cylc-gui-on-a-different-port/1182 "2025-06-06T08:41:08Z")
Hi, I’d like to launch the Cylc GUI on a specific port because several ports are already in use on the server I’m working on. Currently, it starts on a different port each time, which makes it a bit unpredictable. Is t… --- ## [CLI trigger does not check for existance of task being triggered](https://cylc.discourse.group/t/cli-trigger-does-not-check-for-existance-of-task-being-triggered/1180)
**Author:** [@gturek](https://cylc.discourse.group/u/gturek)\ **Replies:** 2\ **Last updated:** [June 4, 2025, 1:53pm UTC](https://cylc.discourse.group/t/cli-trigger-does-not-check-for-existance-of-task-being-triggered/1180 "2025-06-04T13:53:02Z")
Hi there, CLI triggering is very useful for debugging but we noticed that if the name of the task being triggered is misspelled, the command returns “command queued”, and the only clue that something is wrong is that it … --- ## [Running Cylc on TGCC’s Irene – Handling Node Changes Between Job Resubmissions](https://cylc.discourse.group/t/running-cylc-on-tgcc-s-irene-handling-node-changes-between-job-resubmissions/1173)
**Author:** [@cazria](https://cylc.discourse.group/u/cazria)\ **Replies:** 7\ **Last updated:** [June 4, 2025, 10:40am UTC](https://cylc.discourse.group/t/running-cylc-on-tgcc-s-irene-handling-node-changes-between-job-resubmissions/1173 "2025-06-04T10:40:18Z")
Dear Cylc support team, We are working together with the TGCC support team to find a way to run Cylc on the Irene supercomputer, which has specific security policies that require us to use Cylc in a rather unusual way. … --- ## [How one can run the same task multiple times with same setup?](https://cylc.discourse.group/t/how-one-can-run-the-same-task-multiple-times-with-same-setup/1170)
**Author:** [@bpabla50](https://cylc.discourse.group/u/bpabla50)\ **Replies:** 20\ **Last updated:** [June 2, 2025, 9:44pm UTC](https://cylc.discourse.group/t/how-one-can-run-the-same-task-multiple-times-with-same-setup/1170 "2025-06-02T21:44:24Z")
--- ## [Trouble in submitting job](https://cylc.discourse.group/t/trouble-in-submitting-job/1176)
**Author:** [@bpabla50](https://cylc.discourse.group/u/bpabla50)\ **Replies:** 12\ **Last updated:** [May 30, 2025, 11:51am UTC](https://cylc.discourse.group/t/trouble-in-submitting-job/1176 "2025-05-30T11:51:39Z")
--- ## [WUI: Runahead limit is showing for the "next" cycle but not the ones afterwards](https://cylc.discourse.group/t/wui-runahead-limit-is-showing-for-the-next-cycle-but-not-the-ones-afterwards/1175)
**Author:** [@TomC](https://cylc.discourse.group/u/TomC)\ **Replies:** 1\ **Last updated:** [May 26, 2025, 4:00am UTC](https://cylc.discourse.group/t/wui-runahead-limit-is-showing-for-the-next-cycle-but-not-the-ones-afterwards/1175 "2025-05-26T04:00:15Z")
Looking at workflow that has tasks in a failed state, I was looking at the final cycle in the display and thought the runahead limit was not met. But, when looking at the “next” cycle, it shows the runahead limit has bee… --- ## [Suggestion for tui log viewing](https://cylc.discourse.group/t/suggestion-for-tui-log-viewing/1174)
**Author:** [@gturek](https://cylc.discourse.group/u/gturek)\ **Replies:** 1\ **Last updated:** [May 23, 2025, 1:39pm UTC](https://cylc.discourse.group/t/suggestion-for-tui-log-viewing/1174 "2025-05-23T13:39:21Z")
Hi there, would it be possible to be able to navigate subdirectories in the log directory? We run nemo with logs generated for each processor and it would be nice to be able to stick them under log/nemo/… and view them… --- ## [Re-trying failed db transactions](https://cylc.discourse.group/t/re-trying-failed-db-transactions/1154)
**Author:** [@psa](https://cylc.discourse.group/u/psa)\ **Replies:** 4\ **Last updated:** [May 22, 2025, 8:57am UTC](https://cylc.discourse.group/t/re-trying-failed-db-transactions/1154 "2025-05-22T08:57:28Z")
I’ve been adding logging to the cylc DB transactions in rundb.py while trying to run down why our workflows keep crashing. We’ve found that the failures are due to IO Error returned by SQLite when locking (SQLITE\_IOERR\_… --- ## [Cylc broadcast error: WorkflowStopped](https://cylc.discourse.group/t/cylc-broadcast-error-workflowstopped/1167)
**Author:** [@sparonuz](https://cylc.discourse.group/u/sparonuz)\ **Replies:** 10\ **Last updated:** [May 19, 2025, 8:51am UTC](https://cylc.discourse.group/t/cylc-broadcast-error-workflowstopped/1167 "2025-05-19T08:51:59Z")
Good afternoon, I am seeking advice for debugging a broadcast. In particular, I have a task that, after computing a variable, tries to send it to another task. Let’s say that this is my task (named hindcast\_recup\_SST) … --- ## [Cylc install ...any way to install on other path instead of /home](https://cylc.discourse.group/t/cylc-install-any-way-to-install-on-other-path-instead-of-home/1169)
**Author:** [@bpabla50](https://cylc.discourse.group/u/bpabla50)\ **Replies:** 3\ **Last updated:** [May 17, 2025, 2:21am UTC](https://cylc.discourse.group/t/cylc-install-any-way-to-install-on-other-path-instead-of-home/1169 "2025-05-17T02:21:31Z")
--- ## [Run1, run2, ...,runK,...,runN](https://cylc.discourse.group/t/run1-run2-runk-runn/1163)
**Author:** [@schaferk](https://cylc.discourse.group/u/schaferk)\ **Replies:** 5\ **Last updated:** [May 12, 2025, 11:02pm UTC](https://cylc.discourse.group/t/run1-run2-runk-runn/1163 "2025-05-12T23:02:26Z")
cylc8. recently, the node on which the workflow was running was rebooted. i/m not sure if the user did ‘cylc vip .’ again or not. cylc scan indicated the workflow was running. cylc tui however, after ‘loading’, only … --- ## [Cylc Hub disconnection issues](https://cylc.discourse.group/t/cylc-hub-disconnection-issues/1161)
**Author:** [@Rosalyn\_Hatcher](https://cylc.discourse.group/u/Rosalyn_Hatcher)\ **Replies:** 4\ **Last updated:** [May 8, 2025, 1:06pm UTC](https://cylc.discourse.group/t/cylc-hub-disconnection-issues/1161 "2025-05-08T13:06:23Z")
Hi, Following on from https://cylc.discourse.group/t/cylc-hub-issues/1126 we’re still not quite there with a working multi-user cylc hub setup. We are seeing the Cylc UI disconnect from workflows every 52s (the red ban… --- ## [Task needs to run twice](https://cylc.discourse.group/t/task-needs-to-run-twice/1160)
**Author:** [@sparonuz](https://cylc.discourse.group/u/sparonuz)\ **Replies:** 7\ **Last updated:** [May 5, 2025, 3:28pm UTC](https://cylc.discourse.group/t/task-needs-to-run-twice/1160 "2025-05-05T15:28:02Z")
Good afternoon, I have a workflow where I would like to run a task twice. It could be simplified as: \[\[ graph \]\] # # Run just once at the initial cycle point # R1 = """ … --- ## [Cylc8 installation errors: I corrected importlib\_metadata but the colorama problem stumps me!](https://cylc.discourse.group/t/cylc8-installation-errors-i-corrected-importlib-metadata-but-the-colorama-problem-stumps-me/1159)
**Author:** [@soi521](https://cylc.discourse.group/u/soi521)\ **Replies:** 3\ **Last updated:** [May 2, 2025, 9:56am UTC](https://cylc.discourse.group/t/cylc8-installation-errors-i-corrected-importlib-metadata-but-the-colorama-problem-stumps-me/1159 "2025-05-02T09:56:23Z")
Dear Cylc Discourse Group, Apologies for what may be an obvious question: I am not sure whether this problem is to do with Cylc in particular or my version of Python more generally (obviously, if the latter, I understan… --- ## [Access task's submission time in its job script](https://cylc.discourse.group/t/access-tasks-submission-time-in-its-job-script/1162)
**Author:** [@jlentz](https://cylc.discourse.group/u/jlentz)\ **Replies:** 3\ **Last updated:** [May 1, 2025, 3:51am UTC](https://cylc.discourse.group/t/access-tasks-submission-time-in-its-job-script/1162 "2025-05-01T03:51:12Z")
Hello, I have a use case for which it would be useful to know, in a task’s job script or in its prescript, the wall-clock time at which the task was submitted to the scheduler. Is this possible in cylc (8.3.5)? Any hel… --- ## [Installing and using Cylc with uv](https://cylc.discourse.group/t/installing-and-using-cylc-with-uv/1155)
**Author:** [@blaylockbk](https://cylc.discourse.group/u/blaylockbk)\ **Replies:** 4\ **Last updated:** [April 28, 2025, 4:05pm UTC](https://cylc.discourse.group/t/installing-and-using-cylc-with-uv/1155 "2025-04-28T16:05:05Z")
Hi all, I just installed Cylc 8 with uv. It installed very quickly (~10 seconds). I wondered if anyone else has used uv to manage a Cylc project and if they ran into any hiccups. I can’t seem to get the gui to work. M… [Previous page](https://cylc.discourse.group/c/cylc/cylc-support/9.md?page=1) [Next page](https://cylc.discourse.group/c/cylc/cylc-support/9.md?page=3)