JEP proposed to target JDK 11: 318: Epsilon: An Arbitrarily Low-Overhead Garbage Collector

Roman Kennke roman at
Wed Jan 17 10:12:45 UTC 2018

Am 17.01.2018 um 11:03 schrieb Andrew Dinn:
> On 17/01/18 09:43, Aleksey Shipilev wrote:
>> How very unpoetical :) Epsilon has the origin story for its name, see the JEP. Most people,
>> including prospective users, know this feature under "Epsilon" and some expressed the love for the
>> name. So, as long as there is no overwhelming amount of strong opinions against it, I'd keep the
>> name as is.
> "With arbitrarily large TLABs and arbitrarily large heap, the latency
> overhead can be described by an arbitrarily low positive value, hence
> the name."
> Much as I relish poetry in engineered artefacts I am willing to accept
> it as optional (now, as to elegance, that's another matter). However, I
> agree with Aleksey that this case is more than just poetry trumping the
> prosaic. The name declares a significant property of epsilon, affirming
> that GC overheads can be removed for specific uses by suitable (hw and
> sw) configuration but, unlike NoGC, making no claim that they can be
> simply ignored. Oh, also ... poetry!
Why not also add -XX:+UseNoGC as alias for -XX:+UseEpsilonGC ? :-)


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