Mark Slater wrote:
>The short question: does anyone know if Java is running native or
>through Rosetta in the Intel-based macs?
Read this:
<http://developer.apple.com/qa/qa2005/qa1295.html>
For even more developer-related Intel information:
<http://developer.apple.com/transition/index.html>
>The longer version: Can anyone provide (or make an educated guess as
>to) the comparative performance of Java on the new Intel-based iMac?
We'll either have to wait until the machines ship, or someone puts a bunch
of Java benchmarks on a flash drive and stops by the Apple booth at MWSF.
THe new frontside bus is quite a bit faster, though, and there are now 2
core CPUs, and a substantially different video card, so it might not be so
easy to factor in all those things to get the actual JVM performance
figures. It could be that the overall system is faster even if the JVM
itself were slower. I'm not saying the JVM *IS* slower, nor that I expect
it to be slower, only that it could be slower in isolation yet still be a
faster system overall.
>In my case, I'm using maven to run unit and integration tests. On a
>dual 2.7 G5, they take about 1:10 (m:s), and about 2:00 (m:s) on a 2
>GHz iMac G5.
>
>I'm assuming some gains will be made simply from having two
>processors available, but these tests are single threaded (there's a
>difference of seconds between a 500 MHz G4 Powerbook and dual 500 MHz
>G4 PowerMac with both coming in just under 5 minutes).
If dual CPU's makes no difference, then what accounts for the nearly 2:1
speed diff in your dual G5 vs iMac G5 case?
If we suppose that dual CPUs has zero effect, then the only reasonable
interpretation is that all the other factors (clock speedup, memory, FSB,
disk, etc.) cumulatively account for the difference. That supposition
alone says a lot about differential Java performance.
>I'm trying to determine if the new iMac is a good buy for my
>development work, of if I should wait until the PowerMac (Mactel?)
>machines are available.
Since there are no specs or other published information except rumors for
the Intel-based PowerMacs (or whatever they'll be called), the best advice
anyone can offer is "Wait and see for yourself". Or in the case of the new
iMac, "Wait for it to show up at a retail store near you, then go and see
it for yourself".
On the other hand, desktop-box performance has historically exceeded both
laptop and all-in-one performance, mainly because of the extra space inside
the case. But the technological foundation changes often enough that
predictions even 6-9 months ahead can be remarkably mistaken.
In short, your guess is at least as good as anyone else's. It may even be
BETTER than anyone else's, because you are the only one who fully
understands all your own needs and tradeoffs, including how long you're
willing to wait before making a decision.
-- GG
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