One area where D has the edge

[uri via Digitalmars-d]

On Monday, 26 January 2015 at 22:53:15 UTC, Paulo Pinto wrote:
> On Monday, 26 January 2015 at 22:12:24 UTC, Laeeth Isharc wrote:
>> " If Java consumes 15% more power doing it, does
>>>> it matter on a PC? Most people don't dare. Does it matter 
>>>> for small-scale server environments? Maybe not. Does it 
>>>> matter when you deploy Hadoop on a 10,000 node cluster, and 
>>>> the holistic inefficiency (multiple things running 
>>>> concurrently) goes to 30%? Ask the people who sign the 
>>>> checks for the power bill. Unfortunately, inefficiency 
>>>> scales really well.
>>>
>>> No, Java does not consume 15% doing it, because there isn't 
>>> just one implementation of Java compilers.
>>>
>>> Most comercial JVMs do offer the capability of ahead of time 
>>> native code compilation or JIT caches.
>>>
>>> So when those 15% really matter, enterprises do shell out the 
>>> money for such JVMs.
>>>
>>> Oracle commercial JVM and the OpenJDK are just the reference 
>>> implementation.
>>
>> Thanks for the colour.  (For clarity, the content from the 
>> link wasn't by me, and I meant the general gist rather than 
>> the details).  How do commercial JVMs rate in terms of memory 
>> usage against thoughtful native (D) code implementations?  Is 
>> the basic point mistaken?
>
>
> So far I just dabbled in D, because our customers choose the 
> platforms, not we.
>
> However, these are the kind of tools you get to analyse 
> performance in commercial JVMs,
>
> http://www.oracle.com/technetwork/java/javaseproducts/mission-control/java-mission-control-1998576.html
>
> http://www.oracle.com/technetwork/server-storage/solarisstudio/features/performance-analyzer-2292312.html
>
> Just providing the examples from Oracle, other vendors have 
> similar tools.
>
> With them, you can drill down the whole JVM and interactions at 
> the OS level and find performance bottlecks all the way down to 
> generated Assembly code.
>
>
> As for memory usage, Atego JVMs run in quite memory constrained 
> devices.
>
> Here is the tiniest of them, 
> http://www.atego.com/products/atego-perc-ultra/
>
> --
> Paulo

There was also this one from 1998 that was very small

http://www.javaworld.com/article/2076641/learn-java/an-introduction-to-the-java-ring.html

Java has some history running on small devices.

Cheers,
uri