commons-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Hope, Matthew" <Matthew.H...@capitalone.com>
Subject RE: [primitives] Open for business
Date Tue, 02 Sep 2003 08:26:24 GMT
perhaps less so from 1.5 onwards since for non critical performance the ease
of autoboxing is hard to beat but when you are using primitives not just
because of other interface concerns but for performance/space considerations
a pure primitive implementation should be considerably better for large
sizes. An array of int[1000000] for example takes up 4 bytes per entry*
verses an Object array of Integers which takes 20 bytes per entry on
average.

This is 5 times the space! When you use short[] vs Short the difference is a
factor of 10

given that the underlying implementation of IntArrayList will almost
certainly be an array of ints this makes a lot of sense if you care about
the size of your memory footprint...

Matt

* all done on windows 1.3.1 JVM - some jvms may do things differently YMMV

> -----Original Message-----
> From: Yoav Shapira [mailto:yoavs@apache.org] 
> Sent: 02 September 2003 03:49
> To: Jakarta Commons Developers List
> Subject: Re: [primitives] Open for business
> 
> 
> Howdy,
> I may have missed the original discussion, but is primitives 
> going to have
> much of a market given the relative proximity of JDK 1.5 with its
> autoboxing features?  Or are there a bunch of features 
> planned that aren't
> going to be in JDK 1.5 anyways?
> 
> Yoav Shapira
> 
> On Tue, 2 Sep 2003, Stephen Colebourne wrote:
> 
> > The [primitives] project has been created and is now ready 
> for discussion,
> > debate and coding.
> >
> > At present, I have NOT removed anything from [collections]. 
> I believe that
> > there may be people with dependencies on the primitive code 
> there. I do not
> > plan to release that code however, nor will its prescence block a
> > [collections] release. I think that this will probably be 
> the position until
> > [primitives] is ready.
> >
> > So... lets try to get [primitives] sorted ;-)
> >
> > Stephen
> >
> >
> > 
> ---------------------------------------------------------------------
> > To unsubscribe, e-mail: commons-dev-unsubscribe@jakarta.apache.org
> > For additional commands, e-mail: commons-dev-help@jakarta.apache.org
> >
> >
> 
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: commons-dev-unsubscribe@jakarta.apache.org
> For additional commands, e-mail: commons-dev-help@jakarta.apache.org
> 
 
**************************************************************************
The information transmitted herewith is sensitive information intended only
for use by the individual or entity to which it is addressed. If the reader
of this message is not the intended recipient, you are hereby notified that
any review, retransmission, dissemination, distribution, copying or other
use of, or taking of any action in reliance upon this information is
strictly prohibited. If you have received this communication in error,
please contact the sender and delete the material from your computer.

Mime
View raw message