[dikei]

Maybe they run a small heap with a zero-pause JVM like Zing, as pause-less GC generally has lower throughput than normal GC.

[pebal]

Java doesn't have real pause-less GC.

[dikei]

Well, "pause too short to matter" just doesn't have the same ring to it.

[pebal]

One millisecond is not a short pause.

[touisteur]

Modern low-latency GCs never reach 1ms on all the workloads I've put them through. Mind you I don't GC terabytes of RAM so who knows what happens there.