Hello Chris,

Am 27.10.2021 um 21:55 schrieb Hiebert, Chris <chris.hiebert@xxxxxxxxxxxxxx>:

The pre-start jobs are something I've never looked into, and I'm still hoping you would share those APIs with us.

I did some research and indeed information on the topic seems vague and rare.

Some insightful comments can be found here:

https://archive.midrange.com/midrange-l/201609/msg00314.html

Especially the remarks about the spawn() API. From what I've read, I guess "PJ" is just a flag for a given application program, being configured in an SBSD. If you use spawn() "the right way", the OS does not start a fresh job "from zero" but makes an already (pre-activated) PJ run.

It's not entirely clear to me
- how to properly send a PJ back to "PJ state" when work is done. Perhaps this is done automatically by the OS when exiting the main() function with return().
- If and how the OS (de|in)creases the PJ count to match the given workload. It's not clear if this automatic adjustment happens only when work enters through a communications entry in the SBSD.

Another source of some insight:

https://www.ibm.com/docs/en/i/7.2?topic=types-prestart-jobs

:wq! PoC


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