Sorta kinda all of the above. C4 the algo has no pauses, but individual threads stop to crawl their own stacks. i.e., threads stop doing mutator work, but only

Sorta kinda all of the above. C4 the algo has no pauses, but individual threads stop to crawl their own stacks. i.e., threads stop doing mutator work, but only 1-by-1, and only for a very short partial self-stack crawl. C4 the impl I believe now has no pauses also. HotSpot the JVM has pauses, and yes much Zing was on forcing these pause times down. Cliff