Re: [scala] Scala and the 64 bit opportunity

On a 64-bit VM, I believe the arithmetic operations on longs will be compiled to single machine instructions, just operations on Ints on a 32 bit VM.  I haven't researched this, but I know that if you have some code that uses a lot of longs, 64 bit mode will run a ton faster than 32 bit mode.

 

Other than that, I'm not seeing how the JVM being optimized for 32 bit operations would matter, assuming the low-level stuff remained aligned with Java.

 

You also have to think about the future.  Today the JVM may be 32-bit optimized, but will it be tomorrow?

 

On 7/28/08, David Pollak <feeder.of.the.bears@...> wrote:

On Mon, Jul 28, 2008 at 10:23 AM, Erik Engbrecht <erik.engbrecht@...> wrote:

Is there a performance penalty if you are running a 64-bit JVM?

Yes.  HotSpot is optimized for 32 bit, even when running on a 64 bit CPU because most JVM operations are 32 bit ints.
 

 

On 7/28/08, David Pollak <feeder.of.the.bears@...> wrote:

On Mon, Jul 28, 2008 at 10:14 AM, Erik Engbrecht <erik.engbrecht@...> wrote:

I personally would like Scala's Int to 64-bit instead of 32 bit.  Java's int could then translate to Int32.  Everything outside of low-level constructs (e.g. array access) should use 64-bit integers.

And what does this buy other than a significant performance penalty?
 
 

On 7/27/08, jherber <jimherber@...> wrote:

Just watched Javapolis 07 roundtable discussion where Neil Gafter (@Google)
says they are running into 32bit issues today in Java's libraries (int
indexes) and expects regular applications to start hitting them soon.

Given nearly all server (and many notebook) chips have been 64 bit enabled
for years; the 64 bit operating systems adoption tipping point appears to be
essentially here; and > 4GB of ram will soon be common for servers and
notebooks:   How is Scala going to address these issues where integer types
are used all over the place for indexes, start, and length signatures and
internals on built in data types (Lists, etc)?

From a pure technical marketing standpoint, a nascent language not ready for
the larger memory solution space could hurt it's adoption in coming years.

Curious to see what the language team and other developers think.

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http://erikengbrecht.blogspot.com/

--
lift, the simply functional web framework http://liftweb.net
Collaborative Task Management http://much4.us
Follow me: http://twitter.com/dpp
Git some: http://github.com/dpp