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There are none, at least not production grade.

There are none, or you're not aware of their existence?

There are no production implementations of GC algorithms that don't stop the world at all. I know this because I have some expertise in GC algorithms.

I'm curious why you don't consider C4 to be production grade

Azul C4 is not a pauseless GC. In the documentation it says "C4 uses a 4-stage concurrent execution mechanism that eliminates almost all stop-the-world pauses."

Except the documentation says

> C4 differentiates itself from other generational garbage collectors by supporting simultaneous-generational con- currency: the different generations are collected using concurrent (non stop-the-world) mechanisms

It doesn't matter at all. C4 uses STW.

I wish I could have learned more from this interaction than it doesn't matter.

I have heard (and from when I investigated) erlangs GC is 'dont stop the world'.

Maybe my definition is bad though.

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