[infinispan-dev] Eviction maxEntries analysis

[Martin Gencur]

Yup,
understood ;-)

Martin


On Fri, 2012-02-03 at 14:17 -0300, Vladimir Blagojevic wrote:
> Martin,
> 
> There will always be "problems" around sizing in these small containers. 
> I think we are all aware of it now, what is more important is that 
> eviction works properly in all other scenarios! I am ok with this!
> 
> Regards,
> Vladimir
> 
> On 12-02-03 11:59 AM, Martin Gencur wrote:
> > I see, for the bigger numbers entries are evicted (more than just to
> > decrease the number to maxEntries) before I actually check the number so
> > this is expected. For the 2,4,6,8,10 eviction did not run so the cache
> > contains more than maxEntries. Are we OK with that?
> >
> > Thanks
> >
> >
> > M.
> >
> >
> > On Fri, 2012-02-03 at 15:29 +0100, Martin Gencur wrote:
> >> Hi all,
> >> I ran a few tests to find out what is the actual number of entries held
> >> in a cache when certain "maxEntries" param is set for eviction and I
> >> store more than maxEntries entries. I tested with HotSpot JDK6 [1], IBM
> >> JDK 6,7 [2]. OpenJDK6 seems to have the same results as HotSpot JDK.
> >>
> >> Results:
> >>
> >> maxEntries being set ->  actual number of entries held in the cache
> >>
> >> HotSpot JDK:
> >> ------------
> >>
> >> 2 ->  2
> >> 4 ->  4
> >> 6 ->  4
> >> 8 ->  8
> >> 10 ->  8
> >> 256 ->  232
> >> 300 ->  266
> >>
> >> IBM JDK (both 6, 7):
> >> --------------------
> >>
> >> 2 ->  4 (2 with LIRS)
> >> 4 ->  6 (4 with LIRS)
> >> 6 ->  10
> >> 8 ->  11 (8 with LIRS)
> >> 10 ->  13, (8 with LIRS)
> >> 300 ->  287, (266 with LIRS)
> >> 256 ->  247, (232 with LIRS)
> >>
> >> I modified one test in ispn-core to do this testing:
> >> https://github.com/mgencur/infinispan/commit/837a1c752fa7fbfb3f05738dd873e78cbf71d071
> >>
> >>
> >>
> >> Any thoughts ? :)
> >>
> >>
> >>
> >> [1]
> >>
> >> java version "1.6.0_21"
> >> Java(TM) SE Runtime Environment (build 1.6.0_21-b06)
> >> Java HotSpot(TM) 64-Bit Server VM (build 17.0-b16, mixed mode)
> >>
> >> [2]
> >>
> >> java version "1.6.0"
> >> Java(TM) SE Runtime Environment (build pxi3260sr9fp1-20110208_03(SR9
> >> FP1))
> >> IBM J9 VM (build 2.4, JRE 1.6.0 IBM J9 2.4 Linux x86-32
> >> jvmxi3260sr9-20110203_74623 (JIT enabled, AOT enabled)
> >>
> >> java version "1.7.0"
> >> Java(TM) SE Runtime Environment (build pxi3270-20110827_01)
> >> IBM J9 VM (build 2.6, JRE 1.7.0 Linux x86-32 20110810_88604 (JIT
> >> enabled, AOT enabled)
> >>
> >>
> >>
> 

-- 
Martin Gencur
--
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