Add separate idle timeout for last daemon

[matejdro]

Current Behavior

org.gradle.daemon.idletimeout is the same if there is 1 daemon running or if there are 10 daemons running

Expected Behavior

Provide two timeout options:

• When daemon is the only daemon running on the machine (last daemon)
• When there are other daemons still running

Context

I'm currently working on a project that creates very memory intensive gradle daemons - three "full" daemons running simultaneously would completely starve my 32GB system of all memory.

Most of the time this is not an issue - I'm only running one daemon that handles all the builds (my "main" daemon). But occasionally, I will start multiple gradle tasks simultaneously, which will create extra daemons. After this, there will be multiple daemons sitting in the background, hogging lots of memory, even though I only need one most of the time.

I workaround this issue by setting aggressively low org.gradle.daemon.idletimeout. This ensures extra daemons are terminated quickly and do not hog memory. But the problem is that this also means my main daemon will terminate quickly and thus making my main builds slower.

Solution I envision is to have separate timeout for my "main" daemon and for the extra daemons. So I could set aggressive timeout for the extra daemons, but still have my "main" daemon running for longer amounts of time.

Somewhat related to the #14741

[ljacomet]

It could be nice indeed to have shorter timeouts for daemons when there are compatible ones running.

[stale]

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[matejdro]

This would still be nice to have.