Re: [infinispan-dev] Time measurement and expiry
On 20 Oct 2011, at 08:47, Galder Zamarreño wrote:
>>
>> Why are we preferring to provide more cache misses && slower
>> performance, to fake a slightly better precision in eviction?
>>
>
> I guess this is the main question, how much worse would the eviction
> precision be if we only relied on the periodic eviction thread?
We did use to have a periodic eviction thread in the JBoss Cache days, but that used to
cause us problems since we queued events to the cache in order to apply eviction
algorithms.
That was a different case. In JBC we picked nodes for eviction and put them on an
eviction queue and they were analysed periodically. That queue became a bottleneck.
The suggestion here is to essentially cache time lookups so that you don't call
System.cTM() all the time. See Elias Ross' parallel post to this list about
Netty's HashedWheelTimer.
Sanne, I recall your creating a JIRA for this?
--
Manik Surtani
manik(a)jboss.org
twitter.com/maniksurtani
Lead, Infinispan
http://www.infinispan.org
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