ZGC garbage collector

“the best Java GCs have sub-millisecond pause times for huge heap sizes”

“ZGC is effectively pause-free.”

“It has no real GC pauses.”

“it encourages you to allocate a fair amount of memory to your heap, which isn't ideal in this world of kubernetes and microservices”

“ZGC doesn't have GC pauses.”

“guarantees < 1ms pause times even for TB heaps”

“ZGC is able to achieve sub-ms pauses.”

“That throughput penalty is not very high with generational ZGC.”

“ZGC performance is _catastrophically_ bad with 1s, because more time was being spent on "background" GC than actually servicing requests.”

“The low latency that it offers at near G1 speeds is a very good trade off”

“ZGC is unparalleled for low-latency (GC pauses are just gone).”

“now with ZGC, memory management in Java is more predictable than with malloc/free”

“The main practical impact of that has been saying goodbye to GC pauses, and getting low latency”

“in practice it makes it a non-issue for a large class of interesting and very common programs”

“Those pauses are gone today.”

“Well under 1ms for ZGC (to the point that OS-caused hiccups are of similar magnitudes).”

“suggests they’re still off by an order of magnitude”

“ZGC for interactive applications where latency matters a lot”

“ZGC, probably the world's most sophisticated moving collector”

“I just think ZGC is better for the job of a game server.”

“What matters is that the server remains responsive in a timely fashion, which ZGC enables.”

“ZGC has very low latency and the larger the heap you give it the less it'll slow things down”

“ZGC does no work in stop-the-world pauses”

“ZGC is extremely good work.”

“If you want pause freedom, go use ZGC or another modern GC on a modern VM.”

“are no larger than latency hiccups introduced by the OS”

“I have gotten multi second pause times with ZGC.”

“you just rely on ZGC to do its thing, and it works”

“low latency GCs like the JVM's ZGC trading manual memory management for no memory related security vulnerabilities is pretty appealing”

“Modern ZGC guarantees under 1ms pause times”

“Do you need extra-low latency, even at very high percentile and are willing to give away a bit of throughput for it? ZGC”

“I'm not sure it's even better than Java's, especially for modern ZGC”

“especially with the low-latency ZGC garbage collector”

“Games today should be using ZGC.”

“you probably want ZGC (or Shenandoah) because latency is more important than throughput.”

“which have very low pause times (in the order of 1 ms)”

“If you've made that tradeoff for G1 because you wanted lower latency, you probably are going to be happier with ZGC.”

“ZGC and G1 are fantastic engineering achievements for applications that require low latency”

“read instructions translate to way more cpu instructions in the former”

“It's also been a mixed bag, performance-wise.”