G1 GC 是否支持 UseGCOverheadLimit？
Is UseGCOverheadLimit supported with G1 GC?
在 HotSpot JVM GC Tuning Guide the UseGCOverheadLimit option is mentioned only on the pages about CMS and Parallel GCs. Additionally, on GC Ergonomics 文档页面中提到了相关选项 GCTimeLimit 和 GCHeapFreeLimit，就像它们仅适用于并行 GC：
The parallel garbage collector (UseParallelGC) throws an out-of-memory exception if an excessive amount of time is being spent collecting a small amount of the heap. To avoid this exception, you can increase the size of the heap. You can also set the parameters -XX:GCTimeLimit=time-limit and -XX:GCHeapFreeLimit=space-limit [...]
-XX:+UseG1GC 是否支持这些选项？
GC 开销限制是 AdaptiveSizePolicy, which is used in Parallel GC and CMS, but not in G1 的特性。
您还可以仔细检查 gc_overhead_limit_was_exceeded 标志从未在 G1CollectedHeap::mem_allocate 中设置。
因此，-XX:+UseGCOverheadLimit 在 G1 GC 中什么都不做。
在 HotSpot JVM GC Tuning Guide the UseGCOverheadLimit option is mentioned only on the pages about CMS and Parallel GCs. Additionally, on GC Ergonomics 文档页面中提到了相关选项 GCTimeLimit 和 GCHeapFreeLimit，就像它们仅适用于并行 GC：
The parallel garbage collector (UseParallelGC) throws an out-of-memory exception if an excessive amount of time is being spent collecting a small amount of the heap. To avoid this exception, you can increase the size of the heap. You can also set the parameters -XX:GCTimeLimit=time-limit and -XX:GCHeapFreeLimit=space-limit [...]
-XX:+UseG1GC 是否支持这些选项？
GC 开销限制是 AdaptiveSizePolicy, which is used in Parallel GC and CMS, but not in G1 的特性。
您还可以仔细检查 gc_overhead_limit_was_exceeded 标志从未在 G1CollectedHeap::mem_allocate 中设置。
因此，-XX:+UseGCOverheadLimit 在 G1 GC 中什么都不做。