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The preinstalled OS is not even using 64-bit modeThe preinstalled OS is not even using 64-bit modePosted Feb 21, 2007 1:47 UTC (Wed) by dlang (subscriber, #313)In reply to: The preinstalled OS is not even using 64-bit mode by mikov Parent article: Dell users demand more Linux options (ZDNet UK)
I've seen speedups when switching to 64 bits, even with <4g
like all benchmarks, your mileage may vary.
if your task is primary moving data around then the fact that you have more data to move around makes it a loss.
if you are compute bound then the increase in registers can make a huge difference.
java is far from the most efficiant system available, so don't take it's performance as representing everything ;-)
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The preinstalled OS is not even using 64-bit mode Posted Feb 21, 2007 18:03 UTC (Wed) by mikov (subscriber, #33179) [Link] I did a quick trawl through the Spec database to compare 32-bit and 64-bit results of the same system. There aren't that many, but here are a couple I found (the first ones in the output sorted by system name).
I am looking at the baseline results, because they are much more representative for typical non-benchmark apps.
32-bit: 1666 http://www.spec.org/osg/cpu2000/results/res2006q1/cpu2000...
32-bit: 1831 http://www.spec.org/osg/cpu2000/results/res2006q4/cpu2000...
32-bit: 1688 http://www.spec.org/osg/cpu2000/results/res2006q1/cpu2000...
It is interesting that the peak results usually reverse the situation, making the 64-bit faster. Also, different compilers are being used for 32-bit and 64-bit, but this is the closest to a comparison I could find.
Basically, no matter how you look at it, 64-bit doesn't seem to offer significant performance advantage, even if I would not call it slower.
About Java's slowness: I was using that as an example for the benefit of pointer compression. Obviously it can't be tested in a native environment. The point is that its benefits are measurable, and consequently the slowdoan from 64-bits is not negligible.
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