Export a TASK_CYCLE_POINT dependent value to all tasks

Cylc Cylc Support
1

Hi,

I need to get the following values in multiple tasks
NEXT_CYCLE_POINT=$($ISODATETIME ${CYLC_TASK_CYCLE_POINT} --offset1=P1M)
RUN_DURATION_HOURS=$($ISODATETIME ${CYLC_TASK_CYCLE_POINT} ${NEXT_CYCLE_POINT} --as-total H)
Is there a way to make these calculations just once and make them available to all the tasks within a CYCLE_POINT?

Thanks,

2

Is there a way to make these calculations just once

No.

make them available to all the tasks within a CYCLE_POINT?

Yes.

This will make these environment variables available to all tasks, but it won’t save on the compute cost of running the isodatetime command:

[runtime]
    [[root]]
        [[[environment]]]
            NEXT_CYCLE_POINT=$($ISODATETIME ${CYLC_TASK_CYCLE_POINT} --offset1=P1M)
            RUN_DURATION_HOURS=$($ISODATETIME ${CYLC_TASK_CYCLE_POINT} ${NEXT_CYCLE_POINT} --as-total H)

That said, isodatetime should be reasonably quick.

3

Thanks, that will do.

4

Actually there is. The first task in the cycle point could compute the values, then use cylc broadcast to set them in the environment of all upcoming tasks in the same cycle point.

However, I’d just use @oliver.sanders 's solution (which amounts to having every task compute the same values, but it’s easy).

5

Good point about broadcast!