[mike_hearn]

It's how some think. Graal is a full compiler written in Java. There's a long history of JVMs and databases being written in GCd Java. I think you could push it a lot further too. Modern JVM GCs are entirely pauseless for instance.

[pebal]

They are not. All Java GC introduce pauses, only short ones. SGCL for C++ is a true pauseless GC.

[mike_hearn]

It depends how you define "pause" but no, modern GCs like ZGC and Shenandoah are universally agreed to be pauseless. The work done at the start/end of a GC is fixed time regardless of heap size and takes less than a millisecond. At that speed other latencies on your system are going to dominate GC unless you're on a hard RTOS like QNX.