ParallelStream Vs Stream Digest, Vol 113, Issue 94
david.holmes at oracle.com
Fri Sep 30 05:57:05 UTC 2016
On 30/09/2016 3:07 PM, Prakhar Makhija wrote:
> The application makes a hit to a core object over and over again. I have
> to copy this object, i.e. make a clone of it using the Cloneable
> interface, so that the original object cannot be modified. But since the
> references of the old object and clone object would be intact, inside
> the clone method I am explicitly copying the List Map and Set using
> The hardware is i3 processor with 8GB RAM and 1TB hard disk.
You only have two cores on an i3, with hyper-threading so you have very
limited speedup potential to begin with
> So you mean to say, Parallel Stream is good for large data set?
What I mean is that if the data set is too small then the overhead of
parallelizing the work will outweigh the work itself.
> On Sep 30, 2016 10:08 AM, "David Holmes" <david.holmes at oracle.com
> <mailto:david.holmes at oracle.com>> wrote:
> On 30/09/2016 2:24 PM, Prakhar Makhija wrote:
> Hi everyone,
> I have started using both Stream and ParallelStream, for Set
> List and Entry
> of Map.
> What I can't understand is why Stream is taking lesser time than
> Shouldnt ParallelStream be giving better performance than Stream
> in terms
> of Time Complexity?
> Depends on the data set size and your hardware, and what exactly you
> are trying to do in parallel.
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