RFC: Epsilon GC JEP

Peter B. Kessler Peter.B.Kessler at Oracle.COM
Thu Dec 14 23:57:51 UTC 2017


Which collection algorithm would you like System.gc() to run?  Or is your suggestion that all the collectors support a "do not collect unless I call System.gc()" flag?

			... peter

On 12/14/17 01:29 PM, Micha Berger wrote:
> On Thu, Dec 14, 2017 at 09:42:53PM +0100, Roman Kennke wrote:
>> Am 14.12.2017 um 21:18 schrieb Aleksey Shipilev:
>>> On 12/14/2017 01:15 AM, mberger wrote:
>>>> I think Epsilon supporting System.gc() / Runtime.getRuntime().gc() would be very useful. And if the
>>>> behavior isn't wanted, well there is always -XX:+DisableExplicitGC.
> 
>>> And that will do what? System.gc() requests are ignored by Epsilon, because there is nothing to do.
> 
>> I believe he wanted to say that it'd be useful if it *did* something
>> (i.e. collect garbage). I presume the idea is to never do GC, except
>> when explicitely requested.
> 
> Yes, I was saying that in contrast to doing no GC, I would find it useful
> to have a GC system that only collects on demand.
> 
> For example, a server that collects garbage when the number of
> connected clients goes to zero. It could tolerate a small amount of
> object accumulation, possibly stay up indefinitely. (Depending upon
> usage patterns.) And yet it would only delay a socket connection if
> there is a new client vary shortly after.
> 
> -Micha
> 



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