Yes, we had an app that would hold a large amount of data in memory as a cache, about 16GB out of a 24GB heap. Before G1GC we'd see brutal stop-the-world collec

Yes, we had an app that would hold a large amount of data in memory as a cache, about 16GB out of a 24GB heap. Before G1GC we'd see brutal stop-the-world collection pauses. Switching to G1GC we'd get pauses usually under 100ms, occasionally around 200ms. Although if anything ever caused a full GC it would cause a 30+ second pause to process the whole heap. Never got around to trying any of the newer GCs before it was rearchitected.