[concurrency-interest] Improved FJ thread throttling

√iktor Ҡlang viktor.klang at gmail.com
Thu Jul 10 12:42:41 EDT 2014


I'll add it to my dire list of todos :)
On Jul 10, 2014 6:30 PM, "Doug Lea" <dl at cs.oswego.edu> wrote:

> On 07/08/2014 01:39 PM, Doug Lea wrote:
>
>> On 07/08/2014 01:16 PM, √iktor Ҡlang wrote:
>>
>>> How about allowing a System Property to set the number of spares, with
>>> the
>>> default being 256 so one does not have to implement a ThreadFactory to
>>> cap
>>> it
>>>
>>
>> ... It's a little scary to just attach these considerations to a System
>> property, but I'm not otherwise against it.
>>
>
> After sitting on this for a few days, I implemented as
> overridable system property with default 256,
> (java.util.concurrent.ForkJoinPool.common.maximumSpares)
> without any further constraints on value. If people
> want to set to ill-advised values, there's no compelling
> reason top stop them.
>
> Doing this as an added System property might be slightly
> tricky for JDK8 updates: Unless approved otherwise, the
> property will exist but the documentation will not
> be changed to mention it.
>
> Experience reports on this update would still be very welcome.
> We have a bunch of internal tests, but we don't routinely
> run any for layered frameworks like Akka and Quasar.
>
>
>
>>> The only version available is in our jsr166 main (JDK8/JDK9 only)
>>> repository, with the aim of having some of you try it out before
>>> considering integration into OpenJDK.  To use it, you can either use the
>>> jar at http://gee.cs.oswego.edu/dl/__concurrent/dist/jsr166.jar
>>> <http://gee.cs.oswego.edu/dl/concurrent/dist/jsr166.jar> and run with
>>> -Xbootclasspath/p:jsr166.jar; or copy into an OpenJDK and build files:
>>>
>>> http://gee.cs.oswego.edu/cgi-__bin/viewcvs.cgi/jsr166/src/__
>>> main/java/util/concurrent/__ForkJoinPool.java?view=log
>>>
>>>
>>>
>>> <http://gee.cs.oswego.edu/cgi-bin/viewcvs.cgi/jsr166/src/
>>> main/java/util/concurrent/ForkJoinPool.java?view=log>
>>>
>>>
>>>
>>> http://gee.cs.oswego.edu/cgi-__bin/viewcvs.cgi/jsr166/src/__
>>> main/java/util/concurrent/__ForkJoinTask.java?view=log
>>>
>>>
>>>
>>> <http://gee.cs.oswego.edu/cgi-bin/viewcvs.cgi/jsr166/src/
>>> main/java/util/concurrent/ForkJoinTask.java?view=log>
>>>
>>>
>>>
>>> http://gee.cs.oswego.edu/cgi-__bin/viewcvs.cgi/jsr166/src/__
>>> main/java/util/concurrent/__ForkJoinWorkerThread.java?__view=log
>>>
>>>
>>>
>>> <http://gee.cs.oswego.edu/cgi-bin/viewcvs.cgi/jsr166/src/
>>> main/java/util/concurrent/ForkJoinWorkerThread.java?view=log>
>>>
>>>
>>>
>>>
>
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