FME Cloud Server trigger on demand?

There's a few things you can look into:

• Running FME Cloud on a schedule (and workspaces on a schedule too). This way it will start at a specified time, run one or more workspaces and then shut down at a specified time. This is useful for batch processing, when the load is more or less the same every time. You can set this up in the FME Cloud management console.
• Using the FMECloudInstanceController custom transformer, that way you can trigger an FME Cloud instance to start or stop. Using two with a FMEServerJobSubmitter in the middle you can trigger it on demand.

Do keep in mind that when your FME Cloud is busy with a job and it gets a signal to shut down (either from the schedule or through an FMECloudInstanceController) it will shut down, no questions asked. A running job will thus be terminated (but should restart when the instance next starts). So you'll need to make sure that if you run it on a schedule you give it enough time to finish the job. For the on-demand option you'll probably need to introduce a bit of delay to allow the instance to properly start before submitting the job.

Hope this helps.

Do not forget that each time you're using FME Cloud, even if it's a 5 seconds process, one hour is compatibilized in the record.