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From Romain Manni-Bucau <rmannibu...@gmail.com>
Subject Re: [math] Multithreaded performances
Date Mon, 04 Nov 2013 20:58:10 GMT
In sirona we collect (aggregate) data each N ms and we can still use stats
during aggregation (worse case surely)
Le 4 nov. 2013 21:48, "Phil Steitz" <phil.steitz@gmail.com> a écrit :

> On 11/4/13 12:12 PM, Romain Manni-Bucau wrote:
> > But aggregation needs to lock so not a real solution. Lock is fine on
> real
> > cases but not in simple/light ones. ThreadLocal leaks...so a trade off
> > should be found
>
> Depends on the use case.  If the use case is
>
> 0) launch a bunch of threads and let them gather stats individually
> 1) aggregate results
>
> Then the static aggregate method in AggregateSummaryStatistics that
> takes a collection as input will work with no locking required.
>
> Phil
> > Le 4 nov. 2013 18:42, "Phil Steitz" <phil.steitz@gmail.com> a écrit :
> >
> >> On 11/4/13 8:49 AM, Romain Manni-Bucau wrote:
> >>> Hi,
> >>>
> >>> ATM sirona (a java monitoring library in incubator) relies a lot on
> >>> Summary stats object from [math3] but it needed a lock to ensure
> >>> consistency. I know there is a synchronized version but this one
> >>> scales less then the locked one.
> >>>
> >>> My question is quite simple then: will [math] add an implementation
> >>> with thread safety guarantee and good performances? I think for
> >>> instance to the LongAdder of Doug Lea which could be used as a good
> >>> base.
> >> The short answer is yes, patches welcome.
> >>
> >> Ted makes a good point, though; and there is already some support
> >> for aggregation in the stats classes in [math] (i.e., you can
> >> aggregate the results of per-thread stats by using, e.g.
> >> AggregateSummaryStatistics#aggregate).  See MATH-1016 re extending
> >> this to more stats.
> >>
> >> Phil
> >>
> >>> Romain Manni-Bucau
> >>> Twitter: @rmannibucau
> >>> Blog: http://rmannibucau.wordpress.com/
> >>> LinkedIn: http://fr.linkedin.com/in/rmannibucau
> >>> Github: https://github.com/rmannibucau
> >>>
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> >>>
> >>
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> >>
>
>
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>

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