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A good start is to use the option and then refine the output from that if necessary.
The log provides a detailed overview during and outside the pauses about garbage collection activity.
This section gives some guidelines about diagnosing and improving in these cases.
Setting the young generation size to a single value overrides and practically disables pause-time control.
Generally, when moving to G1 from other collectors, particularly the Concurrent Mark Sweep collector, start by removing all options that affect garbage collection, and only set the pause-time goal and overall heap size by using .
In Ref Enq, G1 enqueues Reference Objects into their respective reference queue if their referents were found dead.
If these phases take too long, then consider enabling parallelization of these phases by using the option Young-only and, in general any young collection roughly takes time proportional to the size of the young generation, or more specifically, the number of live objects within the collection set that needs to be copied. This decreases the minimum size of the young generation, allowing for potentially shorter pauses.
G1 is designed to provide good overall performance without the need to specify additional options.
However, there are cases when the default heuristics or default configurations for them provide suboptimal results.
Another problem with sizing of the young generation may occur if application performance, and in particular the amount of objects surviving a collection, suddenly changes.
This may cause spikes in garbage collection pause time.
We propose a novel strategy designed for limited information that can be adapted to different levels of staleness.
We evaluate our strategy against recrawling on real datasets and show that it saves an order of magnitude of API calls while introducing minimal errors.
However, G1's mechanisms to incrementally reclaim space in the heap and the pause-time control incur some overhead in both the application threads and in the space-reclamation efficiency.Tags: Adult Dating, affair dating, sex dating