When will an app pool with both time intervals and a specific time recycle?

Question

Am I correct in assuming an application pool with recycle settings of:

• regular time interval: 1740
• Specific time: 3:00AM

will only reset at 3:00AM, because the time interval is over 24 hours?

Answer 1

On IIS 8.5 (Windows 8.1), I've just run the following test.

My start time is 11:04. I set the app pool to recycle at 11:06 (specific time), and also reset every 5 minutes (regular time interval).

Using PowerShell -

ps w3wp | select ProcessName, StartName

First, when checking the start date of the process, I get 11:04:27 (The time when I changed the settings of the app pool, forcing a recycle).

Then, I get 11:06:00 (when the specific time passes).

I let time go on. The next change is at 11:11:00. This is 5 minutes from when the last specific time recycle kicked in.

So, all in all, the regular time interval counter is reset when the specific time passes.

TL;DR

In the given question, the app pool will reset at 3.00am every day, because the 1740 minutes always gets cut short by the specific time recycles.

Answer 2

That is my understanding as well. The time interval counter would be reset each night at 3:00AM and will never reach its 29 hours threshold.

I can't find any official information about this though. To confirm this assumption turn on event logging and let it run for a few days. Events should be in the Application Event Log with the source WAS