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