GC request: Dynamic GC threadpools

[Theo Levine]

Hello!

Is it possible to make the gc flags for the threadpool sizes and max heap manageable so that they can be set via jcmd? Similar to SoftMaxHeapSize. We would like to increase the resources available to the gc without needing to restart the process.

We restrict the cpus that a process can run on, which we can change dynamically if we find it needs more resources. We are able to scale up and down the parallelism of our own application so as to take advantage of this, but the jvm’s gc threadpools are not able to be changed without restarting. It would be very useful if the pools could be changed via a jcmd hook.

We also restrict the memory available to an application, to ensure that it does not consume all of the ram available on the server and affect neighboring applications. Sometimes, we discover a memory leak where our application is using more memory than expected. We would like to be able to take action in some cases to prevent the application from crashing if we have space available.

This does not need to be reflected immediately, say if we are already in a cycle, it can wait until the next cycle. We are interested in this for both ZGC and G1.

ParallelGCThreads
ConcGCThreads
ZYoungGCThreads
ZOldGCThreads
MaxHeapSize

Thanks!
Theo Levine
Software Engineer - Team Lead
T +13122047513
E Theo.Levine at imc.com<mailto:Theo.Levine at imc.com>
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